Дисертації з теми "Multiple Active Spatial Modulation"
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Younis, Abdelhamid. "Spatial modulation : theory to practice." Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/8990.
Повний текст джерелаStavridis, Athanasios. "On the energy efficiency of spatial modulation concepts." Thesis, University of Edinburgh, 2015. http://hdl.handle.net/1842/15951.
Повний текст джерелаUhl, Brecken. "Direct Spatial Antenna Modulation for Wideband Phase Control." International Foundation for Telemetering, 2010. http://hdl.handle.net/10150/604278.
Повний текст джерелаDirect spatial antenna modulation (DSAM) is a new approach to phased array control that opens up new "smart antenna" architecture possibilities. The DSAM technique leverages the inherent spatial differences of excitation in an antenna in a novel way to achieve the equivalent of conventional modulation and beam control effects. Smart antenna techniques are of potentially increasing importance to test range operations given a trend toward more flexible, internetworked, and autonomous test activities. The DSAM technique has been demonstrated through several generations of analysis, simulation, and prototyping, but has previously only been applied to narrowband antenna designs. Furthermore, the IQ DSAM approach in particular has not been previously implemented in hardware. This paper details the application of IQ DSAM to achieve wideband phase control using a commercial off the shelf (COTS) antenna. The phase control performance of IQ DSAM over a range of 1.5 GHz to 4 GHz is measured across relative field control angles of +/- 45 degrees. The measured IQ DSAM performance is compared to what could be expected from a conventional phased array element control architecture.
Saglam, Halil Derya. "Simulation performance of multiple-input multiple-output systems employing single-carrier modulation and orthogonal frequency division multiplexing." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2004. http://library.nps.navy.mil/uhtbin/hyperion/04Dec%5FSaglam.pdf.
Повний текст джерелаThesis advisor(s): Murali Tummala, Roberto Cristi. Includes bibliographical references (p. 69-71). Also available online.
Abu-alhiga, Rami. "Novel feedback and signalling mechanisms for interference management and efficient modulation." Thesis, University of Edinburgh, 2010. http://hdl.handle.net/1842/4632.
Повний текст джерелаGunde, Kiran. "Spectral Efficiency Improvement in Spatial Modulation Systems." Thesis, 2019. https://etd.iisc.ac.in/handle/2005/4724.
Повний текст джерелаHUANG, PIN-TSUNG, and 黃品璁. "Hardware Design and Implementation of the Low Complexity List Detection Algorithm for the Spatial Modulation MIMO system with Multiple Active Transmit Antennas." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/48g7jj.
Повний текст джерела國立中正大學
通訊工程研究所
105
In the spatial modulation multiple input multiple output (SM-MIMO) system, the best detector is the maximum likelihood detector (MLD). But MLD has the problem of high computational complexity and is not easily implemented by hardware architecture. Therefore many detection algorithms that are of low computational complexity and error rate performance close to theMLD are studied. Extension of the conventional SM-MIMO system to use multiple active transmit antenna for transmitting different symbols is called multiple active-spatial modulation (MA-SM). Low complexity linear detection algorithm of MA-SM signals are comprised of two steps. In the first step, estimation of the L groups of active antennas is performed; and, detection of the transmit symbols from the estimated groups of active antennas is performed in the second step. Unlike the joint detection, such separate detection of the active antennas and transmit symbols is of low complexity at the expense of performance degradation. For the hardware implementation, a 4-by-4 MIMO system with two active antennas transmitting 16-QAM signals is considered. The number of groups L is set to 2. The fixed point simulation results suggest that word length of the proposed architecture is 13 bits. The proposed design is described by Verilog HDL and synthesized by Synoposis Design Compiler.
Lee, Ming-Chun, and 李明峻. "Precoder design for spatial modulation in multiple-input multiple-output systems." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/84667542065250245893.
Повний текст джерела國立交通大學
電信工程研究所
102
Spatial modulation in MIMO system (SM-MIMO) is a promising approach due to its low complexity and high energy efficiency properties. To enhance the SM-MIMO system performance, precoding at transmitter is shown to be effective. In this thesis, we investigate the precoder design techniques. With channel state information at transmitter, we propose two general precoder designs, including the problem formulations and its iterative algorithm, by manipulating the distance between codewords using optimization techniques. The designs can be virtually used in any type of SM-MIMO system. For practical concerns, codebook-based precoding is then introduced for SM-MIMO systems with limited feedback. To construct the effective codebook, we investigate the design criterion and propose three codebook design algorithms with different design considerations through exploiting the vector quantization techniques to maximize the average distance among codewords. Finally, the simulations show the effectiveness of the proposed designs in improving system performance, and confirm their superiority to existing works. Moreover, their feasibility in general SM-MIMO systems is verified as well. Furthermore, the proposed designs can indeed outperform other existing works.
Fang, 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.
Li, Jiong-Yi, and 李炯毅. "A Study of Detection Methods for Single-Carrier Spatial Modulation Based Multiple-Input Multiple-Output Systems." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/68164937937865825737.
Повний текст джерела國立暨南國際大學
電機工程學系
104
Orthogonal frequency division multiplexing (OFDM) is a multicarrier modulation technique. Since its high-speed transmission and robustness against frequency selective channel fading, it is widely adopted in modern wireless communications. However, high peak-to-average power ratio (PAPR) is disadvantage of OFDM. This leads to design problem of power amplifier. In the physical-layer of long Term Evolution (LTE), single-carrier is used for the uplink transmission, and this efficiently lessens the effect of high PAPR. In this thesis, we propose a frequency domain equalization technique for the single-carrier spatial modulation based multiple-input multiple-output system. We employ matrix inverse lemma for sub-block matrices to reduce the computational complexity of the involved matrix inverse in the minimum mean-squared error detection. Also, we apply the M-algorithm for use with the maximum-likelihood approach for selecting the candidates of decision. Results show that better error-rate performance can be obtained.
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 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.
Farto, 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.
Amir, Aslanzadeh Mamaghani Hesam. "Design of a Direct-Modulation Transmitter with Self-Optimizing Feedback and a Highly Linear, Highly Reconfigurable, Continuously-Tunable Active-RC Baseband Filter for Multiple Standards." Thesis, 2009. http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7479.
Повний текст джерелаLakshmi, 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.