Дисертації з теми "Generalised Spatial Modulation"
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Sun, Yafei. "Generalized Spatial Modulation with Correlated Antennas in Rayleigh Fading Channels." International Foundation for Telemetering, 2014. http://hdl.handle.net/10150/578366.
Повний текст джерелаSpatial modulation (SM) is a transmission scheme where only one transmit antenna is active at any time instant. It thus reduces interchannel interference (ICI) and receiver complexity over traditional multi-antenna systems. However, the spectral efficiency of SM is low. To improve the spectral efficiency, generalized spatial modulation (GSM) can be used. In this paper, we propose to apply the Alamouti technique with GSM for correlated antennas, and show that the proposed approach provides significant improvement over conventional SM and GSM. Our study also shows the importance of bit-to-antenna mappings and their roles on the selection of appropriate correlated antennas.
Sun, Yafei, and Deva K. Borah. "Performance Study of Precoding Techniques on Generalized Spatial Modulation with Correlated Antennas." International Foundation for Telemetering, 2015. http://hdl.handle.net/10150/596384.
Повний текст джерелаSpatial modulation (SM) reduces transceiver complexity and inter-channel interference over traditional multiple input multiple output (MIMO) systems. It has been shown recently in the literature that the use of a precoder in an SM or a generalized spatial modulation (GSM) system can significantly improve error performance. This paper investigates two issues related to precoders: 1) the use of a precoder in Alamouti-GSM systems, and 2) the effects of power constraints on the precoder design. The results in this paper show that Alamouti-GSM can improve system performance by several dB. On power constraint issues, the paper shows that there is a trade-off between limiting antenna power fluctuations and the potential gain due to precoders.
Roth, Matthias, Jörg Heber, and Klaus Janschek. "System design of programmable 4f phase modulation techniques for rapid intensity shaping: A conceptual comparison." SPIE, 2016. https://tud.qucosa.de/id/qucosa%3A35096.
Повний текст джерелаGunde, Kiran. "Spectral Efficiency Improvement in Spatial Modulation Systems." Thesis, 2019. https://etd.iisc.ac.in/handle/2005/4724.
Повний текст джерелаFarto, Bernardo Brogueira. "Desenho de pré-codificadores e combinadores para comunicações multiutilizador assistidas por modulações de índice em sistemas pós 5G." Master's thesis, 2020. http://hdl.handle.net/10071/21979.
Повний текст джерелаConsidering the technological advances of the last decades, the next generation of wireless communications is expected to follow the trend of a significant increase in system robustness, spectral efficiency (SE) and energy efficiency (EE). Today in the post5G era, Multiple Input, Multiple Output (MIMO) schemes based on generalised spatial modulations (GSM) as well as other index modulations (IM) have been widely considered as potential candidate techniques for wireless networks. This dissertation aims to design and study a MIMO system for multi-user communications integrating GSM symbols and generalised space-frequency index modulation (GSFIM) symbols. In a first part, a multi-user MIMO system is studied, in which a base station (BS) transmits pre-coded GSM symbols to several receivers. In the GSM approach adopted, multiple antennas transmit different high-level M-QAM symbols simultaneously, up to M =1024. The precoder is designed to remove interference between users while an iterative algorithm based on the alternating direction method of multipliers (ADMM) is applied to the receiver to perform single user GSM detection. The results show that the GSM MU-MIMO approach presented is capable of effectively exploiting a large number of transmission antennas deployed on the transmitter and also provides desempenho gains over conventional MU-MIMO schemes with identical spectral efficiencies. In a second part, a new dimension (beyond space) is introduced, frequency. The behaviour of MMSE and OB-MMSE receivers in a GSFIM-based MIMO system is thus studied. The results show that the GSFIM MU-MIMO system competently exploits communications with large numbers of antennas/sub-carriers and performs better when used with an OB-MMSE receiver.
Peng, Yao-hsien, and 彭耀賢. "Low-Complexity MIMO Detectors for High-Rate Spatial Multiplexing Aided Generalized Spatial Modulation." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/a334q5.
Повний текст джерела國立中山大學
通訊工程研究所
106
Spatial-Multiplexing aided Generalized Spatial Modulation (SMx-GSM) is essentially a combination of Vertical Bell Labs Layered Space-Time and Generalized Spatial Modulation (GSM) to achieve a high transmission rate technology. In transmitter, the transmit antennas are divided into several groups and each group use GSM technique. Therefore, we don’t need a lot of Radio Frequency chain to transmit signal and will not cause serious inter-channel interference. Compare to the conventional GSM, we can implement high transmission rate system by using the characteristics of SMx-GSM symbols at receiver. In this thesis, we explain a low-complexity detector for SMx-GSM. We use tree search algorithm and utilize a low-complexity cost function to find a set of transmit antenna combinations with maximum a posteriori probability for optimal detection. From the results of the simulation, the detection complexity can be greatly reduced, that make high-rate system feasible.
Naresh, Yalagala. "On Media-Based Modulation for Wireless Communications." Thesis, 2019. https://etd.iisc.ac.in/handle/2005/5038.
Повний текст джерелаFang, Chieh-wei, and 方捷暐. "Precoder Design for Generalized Spatial Modulation in Multiple-Input Multiple-Output Systems." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/39518152209902577691.
Повний текст джерела國立中山大學
通訊工程研究所
103
The generalized spatial modulation (GSM) is developed as a promising modulation scheme which effectively compromises the hardware complexity and the spectral efficiency in the multiple-input and multiple-output (MIMO) systems. In this paper, we further propose a precoding design for improving the performance of GSM-MIMO systems. We first formulate precoding design as an optimization of which the worst-case minimum free-distance can be maximized. As well know, the free-distance is the critical metric in evaluating the performance of the maximum likelihood (ML) detection. To facilitate the derivation, we then decompose the precoder design into the power allocation times a structured precoder for each antenna group. With the decomposition, we can easily derive a closed-form solution for the precoder design, which can greatly reduce the computational complexity and is suitable for the real-time implementation. Simulation results show the superiority of our design measured by both the BER and computational complexity compared with the existing methods.
湯凱傑. "Generalized Spatial Modulation Design with Massive MIMO System for next Generation Communications." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/26274747610563728203.
Повний текст джерела國立清華大學
通訊工程研究所
103
The concept of Generalized Spatial modulation (GSM) has been proposed as a promising architecture for low complexity massive MIMO systems. The GSM systems activates only small number of transmit antennas at a symbol time which simply the complexity in implementation. Different selection of the activating antennas patterns change the average symbol error rate (SER) performance, however the optimal selection of the activating antenna patterns is an NP hard problem due to the complicated connection in the universe of antenna patterns set. Through [1] has proposed a suboptimal design criterion for the codeword construction problem, it does not proposed the corresponding algorithms to realize the criterion. Even the suboptimal algorithm for the GSM codeword construction problem has not been proposed yet. Motivating by the above reasons, in this thesis we propose two GSM codeword construction criterions in the sense of minimizing the average symbol error rate (SER). We also design the corresponding systematic greedy-like algorithms for the proposed criterions and for the criterion proposed by [1]. At the last of the thesis we show the numerical results for the proposed codeword construction algorithms and we verify the performance of the proposed algorithms are indeed better than the algorithm whose design criterion is proposed by [1] and also better than the random selection method.
Li, I.-Hsueh, and 李易學. "Low-complexity Generalized Spatial Modulation Schemes Using Codeword-assisted Massive MIMO Detectors." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/88059830106608397625.
Повний текст джерела國立清華大學
電機工程學系
104
Massive multiple-input multiple-output system, has many advantages for wireless communication system, has higher data rate and accommodate more users. Due to generalized spatial modulation can effectively reduce hardware complexity and improve the spectral efficiency of multiple-input multiple-output system, it is a modulation method whitch combines the combination of transmit antennas and digital modulation as a transmission codeword and has been widely discussed in recent years. Nowadays, there are a lot of discussions about the hard-decision detections of generalized spatial modulation. The complexity of inverse matrix operations is high computational. Under these circumstances, we propose a detection method that is similar to tree search whitch has lower computation and present the soft-decision detections whitch is applicable to Low-density parity-check(LDPC) code. In view of the results, we have a tight performance loss compared to maximum a posteriori(MAP) detection.
Chang, Yueh-Lun, and 張岳綸. "Low-Complexity ML and Near-ML Detector Designs for Generalized Spatial Modulation." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/gbfdd5.
Повний текст джерела國立中山大學
通訊工程研究所
107
Generalized spatial modulation (GSM) is a novel multiple-input-multiple-out (MIMO) technique, in which only several transmit antennas are activated in each time slot. Although the maximum likelihood (ML) detector is able to achieve the optimal performance, exhaustive search leads to computational complexity that is difficult to handle. In this paper, a search method called A-star algorithm is adopted, which uses a special heuristic function to directly remove some obviously poor paths. It can have lower complexity without losing performance. However, to determine the value of each node, we use the cost function of codebook-assisted hard decision (CAHD), which is a tree search system. CAHD is a low-complexity detector by setting the number of paths to be reserved for each layer. But when a certain signal is calculated, the other signals and noise are regarded as interference. This has a low complexity, but there is an error floor at high SNR. Our proposed algorithm effectively solves error floor of CAHD because we use the A-star search algorithm. This simulation results show that we can maintain the performance of ML, and the complexity is still lower than ML. On the other hand, we use different weights at different SNR to propose performance near-ML, but the complexity can be more significantly reduced.
Datta, Tanumay. "Low-Complexity Receiver Algorithms in Large-Scale Multiuser MIMO Systems and Generalized Spatial Modulation." Thesis, 2013. http://etd.iisc.ac.in/handle/2005/3429.
Повний текст джерелаDatta, Tanumay. "Low-Complexity Receiver Algorithms in Large-Scale Multiuser MIMO Systems and Generalized Spatial Modulation." Thesis, 2013. http://etd.iisc.ernet.in/2005/3429.
Повний текст джерелаLopes, Hugo André Pontes. "Spatial modulations for green heterogeneous networks." Master's thesis, 2016. http://hdl.handle.net/10071/12948.
Повний текст джерелаThe fast evolution of telecommunications systems resulted in a growing need for networks that support high transmission rates. Associated with this high throughput is the energy cost that gradually makes this systems less energy-efficient . The Generalized Spatial Modulation (GSM) arises from the need to create more "green" communication, allowing best energy efficiencies. The study presented in this thesis aims to highlight firstly, the importance of the development of MIMO (Multiple-Input Multiple-Output) transmission systems capable of increasing the overall throughput of a telecommunications network while maintaining high energy efficiency, focusing on GSM. The second relevant aspect is the study of an algorithm based on the ADMM (Alternating Direction Method of Multipliers) method, as a solution for a low complexity receiver for GSM schemes with a performance close to the optimal one, the maximum likelihood detector (MLD). The ADMM receiver study was conducted in two phases, the first of which refers to the extensive and unique study of the ADMM receiver, with main focus on the various parameters that define it. In the second stage a comparison is made between the settings for various ADMM receivers and some of the known low-complexity receivers, including OB-MMSE (Ordered Block MMSE) and BPDN (Basis Pursuit De-noising), for example. The results obtained from the evaluations performed several scenarios allow us to conclude that the ADMM based receiver combined with refinement techniques, is an efficient alternative and in some cases with better performance than the OB-MMSE receiver, especially for scenarios with a large number of bits per spatial symbol.
Chang, Liang Kai, and 張量凱. "Generalized Spatial Modulation with Massive MIMO over mmWave Channel for Next Generation Wireless Communication Systems." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/styc4g.
Повний текст джерелаLin, Ta-Wei, and 林大為. "Research on Generalized Spatial Modulation for Orthogonal Frequency Division Multiplexing and Single Carrier Frequency Division Multiple Access." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/akwphw.
Повний текст джерела國立臺灣科技大學
電機工程系
107
Spatial Modulation(SM) is one of the most adopted Multiple-Input Multiple-Output(MIMO) techniques in recent years. Its characteristics are only activating one single antenna at the same time, antenna index and transmitted symbol and both being used by the transmission bit. The intention is to increase the spectral efficiency and energy efficiency, there are many other MIMO techniques have been proposed based on the same concept, such as Generalized Spatial Modulation(GSM), Space Shift Keying(SSK), Space Time Shift Keying(STSK) and so on. Generalized Spatial Modulation is an extended version of Spatial Modulation, it activated more than one antenna at the same time, using number of combinations of different antennas, which makes the antenna number no longer has to be limited by the power of two. Generalized Spatial Modulation has more flexibility than original Spatial Modulation. In this thesis, we adopt Orthogonal Frequency Division Multiplexing(OFDM) which is widely used in wireless communication systems and Single Carrier Frequency Division Multiple Access(SC-FDMA) proposed by LTE-A, which adopt Discrete Fourier Transform (DFT) as a precoding scheme and known for its low Peak to Average Power Ratio (PAPR) characteristic as the uplink system. We combine these two systems with GSM, in order to have better bit error rate(BER) and spectral efficiency. In this thesis, we discussed combinations of Spatial Modulation with OFDM and SC-FDMA and proposed GSM-OFDM and GSM-SCFDMA. We will simulate all the systems BER performance in different number antenna case and modulation type through different channel model. Also we discussed the PAPR performance after adding SM and GSM.
Lakshmi, Narasimha T. "Efficient Transceiver Techniques for Massive MIMO and Large-Scale GSM-MIMO Systems." Thesis, 2015. http://etd.iisc.ac.in/handle/2005/3953.
Повний текст джерелаLakshmi, Narasimha T. "Efficient Transceiver Techniques for Massive MIMO and Large-Scale GSM-MIMO Systems." Thesis, 2015. http://etd.iisc.ernet.in/2005/3953.
Повний текст джерелаGonçalves, Carolina Loureiro. "Simulação a nível de sistemas 5G através da utilização de ondas milimétricas." Master's thesis, 2021. http://hdl.handle.net/10071/23654.
Повний текст джерелаDue to the need to meet the requirements of the increasingly demanding mobile market, the fifth generation (5G) of wireless communications is characterized by providing high spectral efficiency (SE) and high energy efficiency (EE). Therefore, there are emerging fundamental technologies used for the next generation networks, such as massive multiple-input multiple-output systems (M-MIMO) based on generalized spatial modulation (GSM), which constitutes a particular case of index modulation (IM). In these systems, it is possible to use millimeter waves (mmWave), which provide extreme data rates, although limitations in coverage are introduced due to the increased signal attenuation. With the purpose of evaluate the performance of millimeter wave communication in 5G systems, a system-level simulator was developed and updated, in order to simulate a 5G New Radio (NR) network, where three different three-dimensional scenarios (UMa, UMi – Street canyon and InO) were employed, using different modulations and the same numerology and frequency range. In a second phase, the results obtained from the system level simulations were analysed and discussed, both in terms of throughput, depending on the number of users and the number of active TRP antennas, and in terms of coverage. Consequently, the results indicate that outdoor scenarios, particularly the UMa scenario, can achieve an improved performance and, in terms of throughput, 64QAM modulation is able to obtain superior results, while, in terms of coverage, QPSK modulation presents the best performance.