Gotowe bibliografie tematyczne / MU mmWave MIMO communications

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Gotowa bibliografia na temat „MU mmWave MIMO communications”

Autor: Grafiati
Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "MU mmWave MIMO communications"

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Dilli, Ravilla. "Performance analysis of multi user massive MIMO hybrid beamforming systems at millimeter wave frequency bands". Wireless Networks 27, nr 3 (4.02.2021): 1925–39. http://dx.doi.org/10.1007/s11276-021-02546-w.

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AbstractMillimeter-wave (mmWave) and massive multi-input–multi-output (mMIMO) communications are the most key enabling technologies for next generation wireless networks to have large available spectrum and throughput. mMIMO is a promising technique for increasing the spectral efficiency of wireless networks, by deploying large antenna arrays at the base station (BS) and perform coherent transceiver processing. Implementation of mMIMO systems at mmWave frequencies resolve the issue of high path-loss by providing higher antenna gains. The motivation for this research work is that mmWave and mMIMO operations will be much more popular in 5G NR, considering the wide deployment of mMIMO in major frequency bands as per 3rd generation partnership project. In this paper, a downlink multi-user mMIMO (MU-mMIMO) hybrid beamforming communication system is designed with multiple independent data streams per user and accurate channel state information. It emphasizes the hybrid precoding at transmitter and combining at receiver of a mmWave MU-mMIMO hybrid beamforming system. Results of this research work give the tradeoff between multiple data streams per user and required number of BS antennas. It strongly recommends for higher number of parallel data streams per user in a mmWave MU-mMIMO systems to achieve higher order throughputs.
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Shim, Seong-Joon, Seulgi Lee, Won-Seok Lee, Jae-Hyun Ro, Jung-In Baik i Hyoung-Kyu Song. "Advanced Hybrid Beamforming Technique in MU-MIMO Systems". Applied Sciences 10, nr 17 (28.08.2020): 5961. http://dx.doi.org/10.3390/app10175961.

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This paper proposes a high performance wireless commmunication technology in MU-MIMO systems. The millimeter wave (mmWave) communication technology was considered for the future wireless communication systems such as the fifth-generation new radio (5G NR). In 5G NR, the mmWave communication technology was studied to increase the use of wide bandwidth and the data rate. Therefore, MU-MIMO systems can be used in mmWave. To decrease the complexity of conventional digital beamforming system, the hybrid beamforming system was studied. In particular, the proposed hybrid beamforming system improves the error performance and average sum rate in partially connected structure (PCS) hybrid beamforming system. The proposed PCS hybrid beamforming system forms variously combined beam patterns using the information of azimuth and elevation angles for the multi-paths according to the number of bits. In addition, the azimuth and elevation angles among the formed beam patterns are estimated according to the received signal strength (RSS). In the simulation results, the proposed PCS hybrid beamforming system has better error performance and the average sum rate than the conventional hybrid beamforming system.
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Khan, Imran, Mohammed H. Alsharif, Mohammad Haseeb Zafar, Madini O. Alassafi, Majid Ashraf, Yongming Huang, Jeong Kim i Jin Hong Kim. "An Efficient Algorithm for mmWave MIMO Systems". Symmetry 11, nr 6 (13.06.2019): 786. http://dx.doi.org/10.3390/sym11060786.

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Efficient and Symmetry based precoding plays a key role in wireless communications. In order to improve the transmission performance of multi-user millimeter wave Multiple-Input Multiple-Output (MIMO) (MU-mmWave MIMO) systems, this paper proposes an analog precoding scheme for the receiver of mmWave MIMO with split sub-array hybrid analog and digital architecture. Then, we propose a hybrid analog and digital precoding algorithm based on channel reciprocity (APoCR) to maximize the spectral efficiency by utilizing the triple joint optimization problem, which can be divided into the analog and digital part. The analog combination vectors (ACVs) are obtained by the signal-to-interference-and-noise ratio (SINR) reception maximization of each downlink user and the analog precoding vectors (APVs) are obtained by the SINR reception maximization of each uplink antenna array. The digital precoder of the transmitter is designed after the analog part optimization to alleviate the interference between multiple data streams of the users. The simulation results show that the proposed precoding algorithm has a better sum rate, fast convergence, and improved SINR than the other state-of-the-art algorithms.
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Zhang, Ding, Panneer Selvam Santhalingam, Parth Pathak i Zizhan Zheng. "CoBF: Coordinated Beamforming in Dense mmWave Networks". ACM SIGMETRICS Performance Evaluation Review 51, nr 1 (26.06.2023): 105–6. http://dx.doi.org/10.1145/3606376.3593531.

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With MIMO and enhanced beamforming features, IEEE 802.11ay is poised to create the next generation of mmWave WLANs that can provide over 100 Gbps data rate. However, beamforming between densely deployed APs and clients incurs unacceptable overhead. On the other hand, the absence of up-to-date beamforming information restricts the diversity gains available through MIMO and multi-users, reducing the overall network capacity. This paper presents a novel approach of "coordinated beamforming" (called CoBF) where only a small subset of APs are selected for beamforming in the 802.11ay mmWave WLANs. Based on the concept of uncertainty, CoBF predicts the APs whose beamforming information is likely outdated and needs updating. The proposed approach complements existing per-link beamforming solutions and extends their effectiveness from link-level to network-level. Furthermore, CoBF leverages the AP uncertainty to create MU-MIMO groups through interference-aware scheduling in 802.11ay WLANs. With extensive experimentation and simulations, we show that CoBF can significantly reduce beamforming overhead and improve network capacity for 802.11ay WLANs.
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Zhang, Ding, Panneer Selvam Santhalingam, Parth Pathak i Zizhan Zheng. "CoBF: Coordinated Beamforming in Dense mmWave Networks". Proceedings of the ACM on Measurement and Analysis of Computing Systems 7, nr 2 (19.05.2023): 1–26. http://dx.doi.org/10.1145/3589975.

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With MIMO and enhanced beamforming features, IEEE 802.11ay is poised to create the next generation of mmWave WLANs that can provide over 100 Gbps data rate. However, beamforming between densely deployed APs and clients incurs unacceptable overhead. On the other hand, the absence of up-to-date beamforming information restricts the diversity gains available through MIMO and multi-users, reducing the overall network capacity. This paper presents a novel approach of "coordinated beamforming" (called CoBF) where only a small subset of APs are selected for beamforming in the 802.11ay mmWave WLANs. Based on the concept of uncertainty, CoBF predicts the APs whose beamforming information is likely outdated and needs updating. The proposed approach complements the existing per-link beamforming solutions and extends their effectiveness from link-level to network-level. Furthermore, CoBF leverages the AP uncertainty to create MU-MIMO groups through interference-aware scheduling in 802.11ay WLANs. With extensive experimentation and simulations, we show that CoBF can significantly reduce beamforming overhead and improve network capacity for 802.11ay WLANs.
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Castaneda, Oscar, Sven Jacobsson, Giuseppe Durisi, Tom Goldstein i Christoph Studer. "Finite-Alphabet MMSE Equalization for All-Digital Massive MU-MIMO mmWave Communication". IEEE Journal on Selected Areas in Communications 38, nr 9 (wrzesień 2020): 2128–41. http://dx.doi.org/10.1109/jsac.2020.3000840.

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Kassam, Joumana, Manar Miri, Roberto Magueta, Daniel Castanheira, Pedro Pedrosa, Adão Silva, Rui Dinis i Atílio Gameiro. "Two-Step Multiuser Equalization for Hybrid mmWave Massive MIMO GFDM Systems". Electronics 9, nr 8 (29.07.2020): 1220. http://dx.doi.org/10.3390/electronics9081220.

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Although millimeter-wave (mmWave) and massive multiple input multiple output (mMIMO) can be considered as promising technologies for future mobile communications (beyond 5G or 6G), some hardware limitations limit their applicability. The hybrid analog-digital architecture has been introduced as a possible solution to avoid such issues. In this paper, we propose a two-step hybrid multi-user (MU) equalizer combined with low complexity hybrid precoder for wideband mmWave mMIMO systems, as well as a semi-analytical approach to evaluate its performance. The new digital non-orthogonal multi carrier modulation scheme generalized frequency division multiplexing (GFDM) is considered owing to its efficient performance in terms of achieving higher spectral efficiency, better control of out-of-band (OOB) emissions, and lower peak to average power ratio (PAPR) when compared with the orthogonal frequency division multiplexing (OFDM) access technique. First, a low complexity analog precoder is applied on the transmitter side. Then, at the base station (BS), the analog coefficients of the hybrid equalizer are obtained by minimizing the mean square error (MSE) between the hybrid approach and the full digital counterpart. For the digital part, zero-forcing (ZF) is used to cancel the MU interference not mitigated by the analog part. The performance results show that the performance gap of the proposed hybrid scheme to the full digital counterpart reduces as the number of radio frequency (RF) chains increases. Moreover, the theoretical curves almost overlap with the simulated ones, which show that the semi-analytical approach is quite accurate.
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Zhai, Xiongfei, Yunlong Cai, Qingjiang Shi, Minjian Zhao, Geoffrey Ye Li i Benoit Champagne. "Joint Transceiver Design With Antenna Selection for Large-Scale MU-MIMO mmWave Systems". IEEE Journal on Selected Areas in Communications 35, nr 9 (wrzesień 2017): 2085–96. http://dx.doi.org/10.1109/jsac.2017.2720197.

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Pavia, João Pedro, Vasco Velez, Nuno Souto, Marco Ribeiro, Pedro Sebastião i Américo Correia. "System-Level Assessment of Low Complexity Hybrid Precoding Designs for Massive MIMO Downlink Transmissions in Beyond 5G Networks". Applied Sciences 12, nr 6 (9.03.2022): 2812. http://dx.doi.org/10.3390/app12062812.

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The fast growth experienced by the telecommunications field during the last few decades has been motivating the academy and the industry to invest in the design, testing and deployment of new evolutions of wireless communication systems. Terahertz (THz) communication represents one of the possible technologies to explore in order to achieve the desired achievable rates above 100 Gbps and the extremely low latency required in many envisioned applications. Despite the potentialities, it requires proper system design, since working in the THz band brings a set of challenges, such as the reflection and scattering losses through the transmission path, the high dependency with distance and the severe hardware constraints. One key approach for overcoming some of these challenges relies on the use of massive/ultramassive antenna arrays combined with hybrid precoders based on fully connected phase-shifter architectures or partially connected architectures, such as arrays of subarrays (AoSAs) or dynamic AoSAs (DAoSAs). Through this strategy, it is possible to obtain very high-performance gains while drastically simplifying the practical implementation and reducing the overall power consumption of the system when compared to a fully digital approach. Although these types of solutions have been previously proposed to address some of the limitations of mmWave/THz communications, a lack between link-level and system-level analysis is commonly verified. In this paper, we present a thorough system-level assessment of a cloud radio access network (C-RAN) for beyond 5G (B5G) systems where the access points (APs) operate in the mmWave/THz bands, supporting multi-user MIMO (MU-MIMO) transmission with massive/ultra-massive antenna arrays combined with low-complexity hybrid precoding architectures. Results showed that the C-RAN deployments in two indoor office scenarios for the THz were capable of achieving good throughput and coverage performances, with only a small compromise in terms of gains when adopting reduced complexity hybrid precoders. Furthermore, we observed that the indoor-mixed office scenario can provide higher throughput and coverage performances independently of the cluster size when compared to the indoor-open office scenario.
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Abdo, Adam Mohamed Ahmed, Xiongwen Zhao, Rui Zhang, Zhenyu Zhou, Jianhua Zhang, Yu Zhang i Imran Memon. "MU-MIMO Downlink Capacity Analysis and Optimum Code Weight Vector Design for 5G Big Data Massive Antenna Millimeter Wave Communication". Wireless Communications and Mobile Computing 2018 (2018): 1–12. http://dx.doi.org/10.1155/2018/7138232.

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Multiuser multiple input multiple output (MU-MIMO) wireless communication system provides substantial downlink throughput in millimeter wave (mmWave) communication by allowing multiple users to communicate at the same frequency and time slots. However, the design of the optimum beam-vector for each user to minimise interference from other users is challenging. In this paper, based on the concept of signal-to-leakage plus noise ratio (SLNR), we analyze the ergodic sum-rate capacity using statistical Eigen-mode (SE) and zero-forcing (ZF) models with Ricean fading channel. In the analysis, the orthogonality of channel vectors between users is assumed to guarantee interference cancelation from other cochannel users. The impact of the number of antenna elements on the achievable sum-rate capacity obtained by dirty paper coding (DPC) method considered as a nonlinear scheme for approximating average system capacity is studied. A power iterative precoding scheme that iteratively finds the most dominant eigenvector (optimum weight vector) for minimising cochannel interference (CCI), that is, maximising the SLNR for all users simultaneously, is designed resulting in enhancement of average system capacity. The average system capacities achieved by the proposed power iterative technique in this study compared with the singular value decomposition (SVD) method are in the ranges of 5–11 bps/Hz and 1–6 bps/Hz, respectively. Therefore, the proposed power iterative method achieves higher performance than the SVD regarding achievable sum-rate capacity.
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Rozprawy doktorskie na temat "MU mmWave MIMO communications"

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Taya, Akihiro. "Cooperative Vehicular Communications for High Throughput Applications". Kyoto University, 2019. http://hdl.handle.net/2433/244580.

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Azevedo, Daniel Filipe Pinheiro de. "Performance comparison of hybrid architectures for millimeter wave communicatins". Master's thesis, Universidade de Aveiro, 2016. http://hdl.handle.net/10773/16945.

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Mestrado em Engenharia Electrónica e Telecomunicações
A proliferação massiva das comunicações sem os faz prever que o número de utilizadores aumente exponencialmente até 2020, o que tornar a necessário um suporte de tráfego milhares de vezes superior e com ligações na ordem dos Gigabit por segundo. Este incremento exigir a um aumento significativo da e ciência espectral e energética. Impõe-se portanto, uma mudança de paradigma dos sistemas de comunicação sem os convencionais, imposta pela introdução da 5a geração. Para o efeito, e necessário desenvolver novas e promissoras técnicas de transmissão, nomeadamente a utilização de ondas milimétricas em sistemas com um número massivo de antenas. No entanto, consideráveis desafios emergem ao adotar estas técnicas. Por um lado, este tipo de ondas sofre grandes dificuldades em termos de propagação. Por outro lado, a adoção de arquiteturas convencionais para sistemas com um número massivo de antenas e absolutamente inviável, devido ao custo e ao nível de complexidade inerentes. Isto acontece porque o processamento de sinal ao nível da camada f sica e maioritariamente feito em banda base, ou seja, no domínio digital requerendo uma cadeia RF por cada antena. Neste contexto as arquiteturas híbridas são uma proposta relativamente recente que visa simplificar a utilização de um grande número de antenas, dividindo o processamento entre os domínios analógico e digital. Para além disso, o número de cadeias RF necessárias e bastante inferior ao número total de antenas do sistema, contribuindo para obvias melhorias em termos de complexidade, custo e energia consumida. Nesta dissertação e implementada uma arquitetura híbrida para ondas milimétricas, onde cada cadeia RF está apenas conectada a um pequeno conjunto de antenas. E considerado um sistema contendo um transmissor e um recetor ambos equipados com um grande número de antenas e onde, o número de cadeias RF e bastante inferior ao número total de antenas. Pré-codificadores híbridos analógico/digital, recentemente propostos na literatura são utilizados e novos equalizadores híbridos analógico/digital são projetados. E feita uma avaliação de performance à arquitetura implementada e posteriormente comparada com uma outra arquitetura, onde todas as antenas estão conectadas a todas as cadeias RF.
The expected massive proliferation of wireless systems points out an exponential increase in the number of users until 2020, which is needed to support up to one thousand times more tra c and connections in order of Gigabit per second. However, these goals require a signi cantly improvement in the spectral and energy e ciency. As a result, it is essential to make a paradigm shift in conventional wireless systems, imposed by the introduction of fth generation (5G). For this purpose, new and promising transmission techniques will be needed, namely the use of millimeter Waves (mmWave) in systems with a massive number of antenna elements. Nevertheless, considerable challenges emerge in the adoption of these techniques. On one hand, mmWave su er great di culties in terms of propagation. On the other hand, the using of conventional architectures for systems with a large number of antennas is absolutely impracticable because of the costs and the level of complexity. This happens because the signal processing in physical layer is mostly done in baseband, which means, that one RF chain for each antenna is required. In this context the hybrid architectures are a relatively recent proposal where the aim is to simplify the use of a large number of antenna elements, dividing the processing between the analog and digital domains. Moreover, the number of RF chains needed are much lower than the total number of antenna elements of the system, which contribute to obvious improvements in terms of complexity, costs and energy consumption. In this Dissertation a hybrid mmWave based architecture, where each RF chain is only connected to a small set of antennas, is implemented. It is considered a system comprising a transmitter and a receiver both equipped with a massive number of antennas and where the number of RF chains is much lower than the number of antennas. Hybrid analog/digital precoders recently proposed in the literature are used and a new hybrid analog/digital equalizer is designed. The implemented architecture is then evaluated and compared with other architecture, where all the antennas are connected to all RF chains.
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DI, STASIO FRANCESCO. "Link optimization considerations for 5G and beyond wireless communications". Doctoral thesis, Politecnico di Torino, 2021. http://hdl.handle.net/11583/2950490.

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Barb, Gordana-Raluca. "Linear equalization techniques for hybrid systems in the millimeter wave band of communications". Master's thesis, Universidade de Aveiro, 2017. http://hdl.handle.net/10773/23470.

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Mestrado em Engenharia Eletrónica e Telecomunicações
Wireless communications are continuously evolving, and the demand for higher data rates, more capacity, a better quality of service and more coverage is rising. The next generation, 5G, is currently being developed and it is expected to be delivered by 2020. However, in order to fulfill the 5G requirements, such as a consistent user experience, peak bit rates of 10 to 50 Gbps, higher reliability and availability, changes in the cellular architecture are needed, using new technology. Millimeter waves are a promising carrier frequency for 5G cellular systems, due to their underutilized large bandwidth that can potentially provide high data rates for future wireless networks. Single-carrier frequency-division multiple access (SC-FDMA), a modified form of orthogonal frequency-division multiple access (OFDMA), is a promising solution technique for high data rate uplink communications in future cellular systems. When compared with OFDMA, SC-FDMA has similar throughput and essentially the same overall complexity. A principal advantage of SC-FDMA is the peak-to-average power ratio (PAPR), which is lower than that of OFDMA, being less sensitive to nonlinear distortion caused by the power amplifier (PA). It is well known that an efficient PA is critical for future millimeter wave based wireless systems. Conjugating mmWaves with massive MIMO will allow packing a higher number of antennas into the same volume, since mmWaves have a smaller wavelength than the currently used cellular systems. Consequently, millimeter wave communications and massive MIMO have been considered as two of the key enabling technologies needed to provide multi-Gbps for future wireless communications. In this Dissertation a hybrid analog-digital multi-user linear equalizer for broadband mmWave massive MIMO SC-FDMA systems is designed and evaluated. The digital part is computed on a per subcarrier basis and the analog part is constant over all subcarriers. The simulation results show that the proposed hybrid equalizer achieves an average BER close to the full-digital equalizer (gap of ∼ 1 dB), when the number of RF chains is twice the number of users. When the number of RF chains is smaller than twice the number of users, a compromise between complexity and performance is achieved.
As comunicações sem fio estão em constante evolução, e a necessidade por elevadas taxas de transmissão de dados, mais capacidade, melhor qualidade de serviço e mais cobertura, está a aumentar. A próxima geração, 5G, está neste momento a ser desenvolvida e espera-se que seja implementada em 2020. No entanto, de forma a cumprir os requisitos do 5G, tais como proporcionar uma melhoria na experiência do utilizador, taxas de transmissão máximas de 10 a 50 Gbps, maior fiabilidade e cobertura, são necessárias mudanças na arquitetura celular, utilizando para tal novas tecnologias. As ondas milimétricas constituem uma frequência portadora promissora para os sistemas celulares 5G, devido à sua grande largura de banda disponível, que potencialmente pode fornecer taxas de transmissão elevadas para os futuros sistemas sem fios. Single-carrier frequency-division multiple access (SC-FDMA), um método modificado de orthogonal frequency-division multiple access (OFDMA), é uma técnica promissora que poderá ser uma solução para comunicações com elevadas taxas de transmissão no sentido ascendente nos sistemas celulares futuros. Quando comparado com OFDMA, SC-FDMA possui um rendimento semelhante e apresenta essencialmente a mesma complexidade. A principal vantagem de SC-FDMA é o peak-to-average power ratio (PAPR), que é menor que no OFDMA, sendo menos sensível às distorções não-lineares causadas pelo amplificador de potência (AP). Sabe-se que a eficiência do AP é um problema crítico para os futuros sistemas sem fio baseados em ondas milimétricas. Conjugando ondas milimétricas com massive MIMO permitirá colocar um maior número de antenas no mesmo volume, uma vez que as ondas milimétricas têm um comprimento de onda menor do que os sistemas celulares usados atualmente. Consequentemente, as comunicações que usam ondas milimétricas e massive MIMO são consideradas duas das principais tecnologias que oferecem as condições necessárias para fornecer multi-Gbps para os futuros sistemas de comunicação. Nesta dissertação é projetado e avaliado um equalizador linear híbrido analógico-digital multi-user para sistemas massive MIMO SC-FDMA de banda larga usando ondas milimétricas. Assume-se que a parte analógica é constante para todas as subportadoras, enquanto que a parte digital é calculada por cada subportadora. Os resultados mostram que a arquitetura proposta atinge uma taxa média de erro próxima do equalizador digital (separação de ∼ 1 dB), quando o número de cadeias RF é o dobro que o número de utilizadores. Se o mesmo for inferior que o dobro dos utilizadores, um compromisso entre complexidade e desempenho é alcançado.
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Vu, K. (Kien). "Integrated access-backhaul for 5G wireless networks". Doctoral thesis, Oulun yliopisto, 2019. http://urn.fi/urn:isbn:9789526222431.

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Abstract With the unprecedented growth in mobile data traffic and network densification, the emerging fifth-generation (5G) wireless network warrants a paradigm shift with respect to system design and technological enablers. In this regard, the prime motivation of this thesis is to propose an integrated access-backhaul (IAB) framework to dynamically schedule users, while efficiently providing a wireless backhaul to dense small cells and mitigating interference. In addition, joint resource allocation and interference mitigation solutions are proposed for two-hop and multi-hop self-backhauled millimeter wave (mmWave) networks. The first contribution of this thesis focuses on a multi-user two-hop relay cellular system in which a massive antenna array enabled macro base station (BS) simultaneously provides high beamforming gains to outdoor users, and wireless backhauling to outdoor small cells. Moreover, a hierarchical interference mitigation scheme is applied to efficiently mitigate cross-tier and co-tier interference. In the second contribution, a multi-hop self-backhauled mmWave communication scenario is studied whereby a joint multi-hop multi-path selection and rate allocation framework is proposed to enable Gbps data rates with reliable communications. Using reinforcement learning techniques, a dynamic and efficient re-routing solution is proposed to cope with blockage and latency constraints. Finally, a risk-sensitive learning solution is leveraged to provide high-reliability and low-latency communications. In summary, the dissertation analyses key trade-offs between (i) capacity and latency, (ii) reliability and network density. Extensive simulation results were carried out to verify the performance gains of the proposed algorithms compared to several baselines and for different network settings. Key findings show significant improvements in terms of higher data rates, lower latency, and reliable communications with some trade-offs
Tiivistelmä Liikkuvan dataliikenteen ennennäkemättömän kasvun ja verkkojen tihentymisen seurauksena pian käyttöön tulevien viidennen sukupolven (5G) langattomien verkkojen järjestelmäsuunnittelua ja teknologisten mahdollistajien käyttöä on täytynyt lähestyä kokonaan uudesta näkökulmasta. Niinpä tämän väitöstyön johtavana ajatuksena on ehdottaa integroitua verkkoon pääsyn ja runkoverkkoyhteyden muodostamismallia, jossa käyttäjät resursoidaan dynaamisesti ja samalla muodostetaan tehokkaat runkoverkkoyhteydet piensoluille. Tätä varten tutkitaan resurssiallokaation ja häiriöiden lieventämisen yhteisratkaisuja, jotka tukevat kahden tai useamman hypyn yhteyksiä ja samanaikaista runkoverkkoyhteyden luomista millimetriaaltoalueen verkoissa. Työn alkuosa keskittyy usean käyttäjän välitinavusteiseen kahden hypyn solukkoverkkoon, jossa makrotukiasemassa käytetään suurta antenniryhmää muodostamaan samanaikaisesti suuren vahvistuksen antennikeiloja käyttäjälinkeille ja langattomalle runkoyhteysosuudelle. Lisäksi sovelletaan hierarkkista häiriönvaimennusmenetelmää saman kerroksen ja kerrosten välisen häiriön tehokkaaseen vähentämiseen. Työn seuraavassa osassa arvioidaan usean hypyn runkoverkkoyhteyden muodostuksen tutkimusongelmaa millimetrialueen kommunikaatiossa kehittämällä yhdistetty menetelmä usean hypyn monipolkuvalinnalle ja tiedonsiirtoresurssien allokoinnille. Tällä tähdätään gigabittiluokan datanopeuksiin ja luotettavaan tietoliikenteeseen millimetrialueella. Vahvistavan oppimisen tekniikan avulla esitellään dynaaminen ja tehokas uudelleenreitityskonsepti toimimaan esto- ja viiverajoitusten kanssa. Lopuksi hyödynnetään riskisensitiivistä oppimista ja antennidiversiteettitekniikoita suuren luotettavuuden ja pienen latenssin saavuttamiseksi millimetrialueen tiedonsiirrossa. Näiden avulla analysoidaan kaupankäyntiä esimerkiksi (i) kapasiteetin ja latenssin sekä (ii) luotettavuuden ja verkon tiheyden/kuormituksen välillä. Mittavien suoritettujen simulointien avulla osoitetaan ehdotettujen algoritmien suorituskykyedut suhteessa tunnettuihin verrokkeihin useissa eri skenaarioissa. Tulosten perusteella saavutetaan merkittäviä kustannussäästöjä infrastruktuurin ja runkoverkon osalta sekä päästään suuriin datanopeuksiin ja parannuksiin pienen latenssin luotettavassa tietoliikenteessä
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Correia, Luís Miguel Ribeiro. "Hybrid equalization techniques for heterogeneous systems in the millimeter wave band". Master's thesis, 2021. http://hdl.handle.net/10773/32345.

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With the constant demand for better service and higher transmission rates current technologies are reaching the limits of the channel capacity. Although, technologies such as MIMO and Heterogeneous systems appear to increase the channel capacity by introducing more antennas at the transceivers making the link between users and base station more reliable. Furthermore, the current spectrum, sub-6GHz, is becoming saturated and due to the properties of such frequencies the deployment of heterogeneous systems can introduce some levels of interference. Towards improving future communication systems a new part of the frequencies spectrum available should be used, researchers have their eyes on the mmWave band. This band allows to increase the carrier frequency and respective signal bandwidth and therefore increase the transmission speeds, moreover the properties of such frequencies unlock some advantages over the frequencies used in the sub-6G band. Additionally, mmWave band can be combined with massive MIMO technology to enhance the system capacity and to deploy more antenna elements in the transceivers. One more key technology that improves the energy efficiency in systems with hundreds of antenna elements is the possibility to combine analog and digital precoding techniques denoted as hybrid architectures. The main advantages of such techniques is that contrary to the full digital precoding processing used in current systems this new architecture allows to reduce the number of RF chains per antenna leading to improved energy efficiency. Furthermore to handle heterogeneous systems that have small-cells within the macro-cell, techniques such as Interference Alignment (IA) can be used to efficiently remove the existing multi-tier interference. In this dissertation a massive MIMO mmWave heterogeneous system is implemented and evaluated. It is designed analog-digital equalizers to efficiently remove both the intra an inter-tier interference. At digital level, an interference alignment technique is used to remove the interference and increase the spectral efficiency. The results showed that the proposed solutions are efficient to remove the macro and small cells interference.
Com a constante procura de melhores serviços e taxas de transmissão mais elevadas, as tecnologias atuais estão a atingir os limites de capacidade do canal. Contudo tecnologias como o MIMO e os sistemas heterogéneos permitem aumentar a capacidade do canal através da introdução de mais antenas nos transcetores e através da implementação de pequenos pontos de acesso espalhados pela célula primária, com o intuito de tornar as ligações entre os utilizadores e a estação base mais fiáveis. Tendo também em atenção que o espectro atual, sub-6GHz, está sobrecarregado e que devido às propriedades das frequências utilizadas a implementação de sistemas heterogéneos pode levar a níveis de interferência insustentáveis. Por modo a resolver esta sobrecarga futuros sistemas de comunicação devem aproveitar uma maior parte do espectro de frequências disponível. A banda das ondas milimétricas (mmWave) tem sido apontada como solução, o que permite aumentar a frequência utilizada para transportar o sinal e consequentemente aumentar as velocidades de transmissão. Uma outra vantagem da banda mmWave é que pode ser combinada com a tecnologia MIMO massivo, permitindo implementar mais elementos de antena nos terminais e consequentemente aumentar a capacidade do sistema. Umas das tecnologias desenvolvida para melhorar a eficiência energética em sistemas com centenas de antenas é a possibilidade de combinar técnicas de codificação analógica e digital, designadas como arquiteturas híbridas. A principal vantagem desta técnica é que, contrariamente ao processamento feito nos sistemas atuais, totalmente no domínio digital, esta nova arquitetura permite reduzir o número de cadeias RF por antena. Com o intuito de reduzir a interferência em sistemas heterogéneos, técnicas como o alinhamento de interferência são usadas para separar utilizadores das células secundárias dos utilizadores das células primárias de modo a reduzir a interferência multi-nível existente no sistema geral. Nesta dissertação, é implementado e avaliado um sistema heterogéneo que combina MIMO massivo e ondas milimétricas. Este sistema é projetado com equalizadores analógico-digitais para remover com eficiência a interferência intra e inter-camadas. No domínio digital é utilizada a técnica de alinhamento de interferência para remover a interferência e aumentar a eficiência espectral. Os resultados mostram que as soluções propostas são eficientes para remover a interferência entre as células secundárias e a primária.
Mestrado em Engenharia Eletrónica e Telecomunicações
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Bento, Pedro Daniel Rosete. "Multilayer Massive MIMO at mmWave for High Power and Spectral Efficient Communications". Doctoral thesis, 2020. http://hdl.handle.net/10316/88838.

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Tese no âmbito do Doutoramento em Engenharia Electrotécnica e de Computadores – Ramo de Especialização em Telecomunicações e apresentada ao Departamento de Engenharia Electrotécnica e de Computadores da Faculdade de Ciências e Tecnologia
The evolution from 4th Generation (4G) to 5th Generation (5G) wireless systems is driven by the expected huge growth in user bit rates and overall system throughput. This requires a substantial spectral efficiency increase, while maintaining or even improving power efficiency. To accomplish this, one needs new transmission techniques employing new technologies, with the most promising ones being millimeter Wave (mmWave) frequencies and massive Multiple-Input and Multiple-Output (m-MIMO). We consider broadband mmWave transmission with high spectral and power efficiencies. We develop new signal processing schemes for a novel multilayer m-MIMO architecture with large antenna arrays that explores spatial multiplexing, beamforming and employs efficient amplification. To cope with time-dispersive effects associated to high data rate transmission over multipath channels while achieving high power efficiency, we propose the use of Single Carrier with Frequency Domain Equalisation (SC-FDE) schemes using high-level constellation sizes that are decomposed into Offset Quadrature Phase Shift Keying (OQPSK)-type signals and have quasi-constant envelope, allowing the use of amplification schemes based on multiple Non-Linear Amplifiers (NLAs). Upon reception, we address the uplink transmission case, and we propose a set of low complexity iterative equalisers for offset and non-offset modulations within the proposed multilayer m-MIMO architecture.
A evolução dos sistemas sem fios de 4ª geração (4G) para a 5ª geração (5G) é impulsionada pelo enorme crescimento esperado das taxas de dados dos utilizadores e na taxa de transferência global do sistema. Isso requer um aumento substancial da eficiência espectral, mantendo ou até melhorando a eficiência energética. Para isso, são necessárias novas técnicas de transmissão empregando novas tecnologias, sendo as mais promissoras as frequências de ondas milimétricas (en: mmWave) e sistemas massivos de múltipla entrada e múltipla saída (en: m-MIMO). Neste trabalho é considerada a transmissão de banda larga nas ondas milimétricas com alta eficiência espectral e de potência. Desenvolvemos novos esquemas de processamento de sinal para uma nova arquitetura m-MIMO multicamada com grandes matrizes de antenas que exploram multiplexação espacial, formação de feixe (en: beamforming) e empregam amplificação eficiente. Para lidar com os efeitos dispersivos no domínio temporal associados à transmissão de alta taxa de dados nos canais multipercurso enquanto se obtém alta eficiência energética, propomos o uso de esquemas mono portadora com equalização no domínio da frequência (en: SC-FDE) usando constelações de tamanho elevado que são decompostas em sinais do tipo OQPSK e têm envolvente quase constante, permitindo o uso de esquemas de amplificação baseados em múltiplos amplificadores não lineares (en: NLA). Na recepção, abordamos o caso de ligação ascendente e propomos um conjunto de equalizadores iterativos de baixa complexidade para modulações com e sem offset dentro da arquitetura m-MIMO multicamada proposta.
European Regional Development Fund (FEDER); Fundação para a Ciência e a Tecnologia (FCT)
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Liang, Le. "Practical Precoding Design for Modern Multiuser MIMO Communications". Thesis, 2015. http://hdl.handle.net/1828/6910.

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The use of multiple antennas to improve the reliability and capacity of wireless communication has been around for a while, leading to the concept of multiple-input multiple-output (MIMO) communications. To enable full MIMO potentials, the precoding design has been recognized as a crucial component. This thesis aims to design multiuser MIMO precoders of practical interest to achieve high reliability and capacity performance under various real-world constraints like inaccuracy of channel information acquired at the transmitter, hardware complexity, etc. Three prominent cases are considered which constitute the mainstream evolving directions of the current cellular communication standards and future 5G cellular communications. First, in a relay-assisted multiuser MIMO system, heavily quantized channel information obtained through limited feedback contributes to noticeable rate loss compared to when perfect channel information is available. This thesis derives an upper bound to characterize the system throughput loss caused by channel quantization error, and then develops a feedback quality control strategy to maintain the rate loss within a bounded range. Second, in a massive multiuser MIMO channel, due to the large array size, it is difficult to support each antenna with a dedicated radio frequency chain, thus making high-dimensional baseband precoding infeasible. To address this challenge, a low-complexity hybrid precoding scheme is designed to divide the precoding into two cascaded stages, namely, the low-dimensional baseband precoding and the high-dimensional phase-only processing at the radio frequency domain. Its performance is characterized in a closed form and demonstrated through computer simulations. Third, in a mmWave multiuser MIMO scenario, smaller wavelengths make it possible to incorporate excessive amounts of antenna elements into a compact form. However, we are faced with even worse hardware challenges as mixed signal processing at mmWave frequencies is more complex and power consuming. The channel sparsity is taken advantage of in this thesis to enable a simplified precoding scheme to steer the beam for each user towards its dominant propagation paths at the radio frequency domain only. The proposed scheme comes at significantly reduced complexity and is shown to be capable of achieving highly desirable performance based on asymptotic rate analysis.
Graduate
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Tsungwei, Cho, i 卓宗緯. "SLNR Based Tomlinson-Harashima Precoding Techniques For MU-MIMO Communications Systems". Thesis, 2012. http://ndltd.ncl.edu.tw/handle/25865049868233222952.

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碩士
國立中正大學
通訊工程研究所
100
Multi-user multiple-input-multiple-out (MU-MIMO) downlink communications have drawn great research attention recently due to its capability of providing high data-rate high reliability services. In order to effectively suppress the co-channel interference (CCI) among the mobile users, the leakage-based precoding has been proposed. The leakage-based precoding decouples the MU-MIMO system into multiple parallel single-user system and allows for closed-form solution, and therefore has relatively low computational complexity. In this paper, we investigate a number of new leakage-based precoding design problems. In our first proposed scheme, the design allows parallel encoding for all spatial streams in the Tomlinson-Harashima precoding within the same user and hence has the advantage of very low precoding latency. In our second scheme, we combine the technique of geometric-mean-decomposition (GMD) with leakage-based precoding and then compare with the existing block-diagonal geometric-mean-decomposition (BD-GMD). In the third scheme, we introduce the lattice reduction technique to leakage-based precoding, and show great computational savings in the lattice-reduction procedure. The proposed designs have been verified and compared through extensive numerical simulations.
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TSAI, YI-LIN, i 蔡易霖. "New Hybrid Analog-Digital Transceiver Design Architectures for Multi-stream Multi-User mmWave MIMO Communications". Thesis, 2017. http://ndltd.ncl.edu.tw/handle/5872zn.

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碩士
國立中正大學
通訊工程研究所
105
Millimeter-wave (mmWave) has become one of the most promising technologies to deal with the growing demand for data transmission over wireless networks. Due to the propagation characteristics in the mmWave band, there is a higher path loss compared to the microwave frequency band. MmWave communication combined with massive MIMO technique has been proposed. In traditional multi-user fully-digital MIMO system, every antenna connects to one RF chain. Unfortunately, due to the hardware cost and power constraint, fully-digital architecture with a large antenna array in millimeter-wave systems is difficult to implement. Recent works in the literature advocate a hybrid architecture for millimeter-wave systems to solve this problem. In this thesis, after reviewing the recent literature, we proposed new multiuser hybrid transeiver architecture and algorithms in mmWave systems, and then proposed two designs to harvest array gain. Simulation results demonstrate that our proposed algorithms can approach to the total transmission rate of the fully-digital architecture.
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Książki na temat "MU mmWave MIMO communications"

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Cheng, Xiang, Shijian Gao i Liuqing Yang. mmWave Massive MIMO Vehicular Communications. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-030-97508-1.

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MmWave Massive MIMO Vehicular Communications. Springer International Publishing AG, 2022.

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Części książek na temat "MU mmWave MIMO communications"

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Zhang, Yanqiu, Shu Fang, Yuanchao Han i Yu Zeng. "D2D Assisted MU-MIMO Precoding to Enhance LTE Network". W Communications and Networking, 512–23. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-78130-3_53.

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Zhu, Cuitao, Ning Wei, Zhongjie Li i Hanxin Wang. "Two Stage Detection for Uplink Massive MIMO MU-SCMA Systems". W Communications and Networking, 414–24. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-06161-6_41.

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Gao, Hao, Yanling Huang i Danpu Liu. "Beam-Based Secure Physical Layer Key Generation for mmWave Massive MIMO System". W Communications and Networking, 37–51. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-67720-6_3.

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Kamal, Shahanawaz, Abdullahi S. B. Mohammed, Mohd Fadzil Bin Ain, Ubaid Ullah, Fathul Najmi, Roslina Hussin, Mohamad Faiz Mohamed Omar i Zainal Arifin Ahmad. "A Compact MIMO Antenna for Wideband Circularly Polarized mmWave Communications". W Lecture Notes in Electrical Engineering, 273–79. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-8129-5_43.

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Udataneni, Divya, i Vijayalakshmi Maddala. "Channel Estimation of mmWave Massive MIMO Systems Using Large Intelligent Surfaces". W Communications in Computer and Information Science, 242–50. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-35644-5_19.

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Durga, A. Mounika, i Shaik Jakeer Hussain. "Optimization of Channel Capacity of MmWave Massive MIMO Using Hybrid Precoding". W Proceedings of First International Conference on Computational Electronics for Wireless Communications, 615–25. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-6246-1_52.

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Jing, Xiaoli, Xianpeng Wang, Xiang Lan i Liangtian Wan. "$${{\varvec{l}}}_{{\varvec{1/2}}}$$-SVD Based Channel Estimation for MmWave Massive MIMO". W Advances in Wireless Communications and Applications, 13–21. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-2255-8_2.

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Wang, Dehao, Le Yang, Xupeng Li, Qian Wang, Feng Zhang i Dingyuan Shi. "A Precoding Algorithm Based on Weighted MMSE for MmWave MU-MIMO System with Discrete Lens Array". W Lecture Notes in Electrical Engineering, 36–43. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1260-5_5.

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Nyarko, James Kweku Nkrumah, i Christian Ango Mbom. "Optimal ZF Precoder Under per Antenna Power with Conjugate Beamforming for MU Massive MIMO Systems". W Communications and Networking, 189–98. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-78139-6_20.

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Kalyan, T. Pavan, i K. Chanthirasekaran. "PDR Improvements Using Per User Based Multi Threshold Scheduling Compared to Priority Scheduling for MU-MIMO Networks". W Communications in Computer and Information Science, 424–30. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-25088-0_38.

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Streszczenia konferencji na temat "MU mmWave MIMO communications"

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Cuvelier, Travis, i Robert W. Heath. "MmWave MU-MIMO for Aerial Networks". W 2018 15th International Symposium on Wireless Communication Systems (ISWCS). IEEE, 2018. http://dx.doi.org/10.1109/iswcs.2018.8491045.

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Wang, James, Fang-Biau Ueng i Bo-Xun Huang. "Novel Detectors for mmWave Massive MU-MIMO-GFDM Systems". W 2021 IEEE International Mediterranean Conference on Communications and Networking (MeditCom). IEEE, 2021. http://dx.doi.org/10.1109/meditcom49071.2021.9647548.

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Ortega, Alvaro Javier, Raimundo Sampaio-Neto i Rodrigo Pereira David. "Hybrid precoded index modulation in downlink mmWave MU-MIMO systems". W 2019 International Conference on Computing, Networking and Communications (ICNC). IEEE, 2019. http://dx.doi.org/10.1109/iccnc.2019.8685653.

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Ortega, Alvaro Javier. "SI-based hybrid precoder for mmWave massive MU-MIMO systems". W 2022 IEEE Colombian Conference on Communications and Computing (COLCOM). IEEE, 2022. http://dx.doi.org/10.1109/colcom56784.2022.10107841.

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Zhai, Xiongfei, Yunlong Cai, Qingjiang Shi, Minjian Zhao, Geoffrey Ye Li i Benoit Champagne. "Joint antenna selection and transceiver design for MU-MIMO mmWave systems". W ICC 2017 - 2017 IEEE International Conference on Communications. IEEE, 2017. http://dx.doi.org/10.1109/icc.2017.7996971.

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Pal, Rahul, i Kishor P. Sarawadekar. "Performance Study of mmWave Beamspace MU-MIMO-NOMA Communication System". W 2019 IEEE International Conference on Advanced Networks and Telecommunications Systems (ANTS). IEEE, 2019. http://dx.doi.org/10.1109/ants47819.2019.9117959.

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Castaneda, Oscar, Seyed Hadi Mirfarshbafan, Shahaboddin Ghajari, Alyosha Molnar, Sven Jacobsson, Giuseppe Durisi i Christoph Studer. "Resolution-Adaptive All-Digital Spatial Equalization for mmWave Massive MU-MIMO". W 2021 IEEE 22nd International Workshop on Signal Processing Advances in Wireless Communications (SPAWC). IEEE, 2021. http://dx.doi.org/10.1109/spawc51858.2021.9593110.

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Ortega, Alvaro Javier, Raimundo Sampaio-Neto i Rodrigo Pereira David. "Hybrid Precoding Design and Power Allocation For Massive MU-MIMO mmWave Systems". W 2022 International Wireless Communications and Mobile Computing (IWCMC). IEEE, 2022. http://dx.doi.org/10.1109/iwcmc55113.2022.9824927.

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Song, Xiaoshen, Thomas Kuhne i Giuseppe Caire. "Fully-Connected vs. Sub-Connected Hybrid Precoding Architectures for mmWave MU-MIMO". W ICC 2019 - 2019 IEEE International Conference on Communications (ICC). IEEE, 2019. http://dx.doi.org/10.1109/icc.2019.8761521.

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Gao, Meilin, Bo Ai, Yong Niu, Wen Wu, Peng Yang, Feng Lyu i Xuemin Sherman Shen. "On Hybrid Beamforming of mmWave MU-MIMO System for High-Speed Railways". W ICC 2019 - 2019 IEEE International Conference on Communications (ICC). IEEE, 2019. http://dx.doi.org/10.1109/icc.2019.8762074.

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