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Stacked Alamouti Based Spatial Modulation

IEEE TRANSACTIONS ON COMMUNICATIONS 2019年第1期67卷 336-349页

作者： Wang, Lei Chen, Zhigang Xi An Jiao Tong Univ Sch Elect & Informat Engn Xian 710049 Shaanxi Peoples R China Univ Delaware Dept Elect & Comp Engn Newark DE 19716 USA

In this paper, a high-rate and diversity-achieving spatial modulation transmission scheme is proposed, which uses the stacked Alamouti code as the transmitted signal matrix and then is named as stacked Alamouti based spatial modulation (SA-SM) scheme. In this scheme, the spatial constellation (SC) is composed of all the possible activated antennas combinations. According to a specific SC codeword, the corresponding symbols in the stacked Alamouti code are simultaneously activated. Owing to the structure of stacked Alamouti code, the SA-SM scheme can work with arbitrary even number of transmit antennas n(T), and any number of activated antennas from 1 to n(T). With the same number of activated antennas n(A), the SA-SM scheme carries more symbols than the spatially modulated orthogonal space-time block codes (SM-OSTBC) scheme, thus SA-SM can achieve higher spectral efficiency. Without the need of any parameter or matrix optimization, the SA-SM scheme enjoys the non-vanishing determinants property. Moreover, owing to possessing the block-orthogonal structure, SA-SM enables faster metric computations in the QR decomposition-M detection, and then it achieves significant decoding complexity reduction without performance loss. Under various system configurations, the performance advantages of SA-SM over several existing diversity-achieving SM schemes such as GSTSK and SM-OSTBC, are shown by simulation results for various spectral efficiencies.

关键词： MIMO systems spatial modulation transmit diversity block-orthogonal qrdm algorithm

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A Hybrid Dynamic qrdm and ZF Detection algorithm for MIMO-OFDM Systems

A Hybrid Dynamic QRDM and ZF Detection Algorithm for MIMO-OF...

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8th International Conference on Wireless Communications, Networking and Mobile Computing (WiCOM)

作者： You, Weizhi Yi, Lilin Hu, Weisheng Shanghai Jiao Tong Univ Dept Elect Engn State Key Lab Adv Opt Commun Syst & Networks Shanghai 200030 Peoples R China

ISBN: (纸本)9781612846835;9781612846828

An effective signal detection algorithm with low complexity is presented for MIMO-OFDM systems. The proposed technique combines a dynamic QR decomposition based M-algorithm (qrdm) and Zero-Forcing (ZF) detection. In the systems, qrdm is executed for the first N-T-[N-T/3]+1 layers, ZF detection is used for the last [N-T/3]-1 layers, where N-T means the number of transmitter antennas. Compared with the conventional qrdm algorithm, this approach is simple and has low complexity because not all branches are searched. Furthermore, the performance of this algorithm is similar to that of the conventional qrdm algorithm. The receiver detection simulation is based on five paths Rayleigh fading environment without channel coding, assuming the channel matrix H is perfectly known by the detector. From simulation results, the complexity of qrdm-ZF detection algorithm for 4 transmitter antennas and 4 receiver antennas systems with quadra-binary-shift-keying (QBSK) modulation is reduced by 29.41% on average and it is reduced by 30.08% on average for 16-quadra-amplitude-modulation (QAM). The performance degradation is about 2dB at BER=10(-3). The proposed hybrid qrdm-ZF detection can be used for a MIMO-OFDM receiver requiring not very high performance but needing very low complexity.

关键词： MIMO-OFDM QR-decomposition Zero-Forcing qrdm algorithm qrdm-ZF algorithm

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A Hybrid Dynamic qrdm and ZF Detection algorithm for MIMO-OFDM Systems

A Hybrid Dynamic QRDM and ZF Detection Algorithm for MIMO-OF...

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International Conference on Wireless Communications, Networking and Mobile Computing

作者： Weizhi You Lilin Yi Weisheng Hu State Key Lab of Advanced Optical Communication Systems and Networks Dept. Electronic Engineering Shanghai Jiao Tong University

ISBN: (纸本)9781612846842

An effective signal detection algorithm with low complexity is presented for MIMO-OFDM systems. The proposed technique combines a dynamic QR decomposition based M-algorithm (qrdm) and Zero-Forcing (ZF) detection. In the systems, qrdm is executed for the first N_T-[N_T/3]+1 layers, ZF detection is used for the last [N_r/3]-1 layers, where N_T means the number of transmitter antennas. Compared with the conventional qrdm algorithm, this approach is simple and has low complexity because not all branches are searched. Furthermore, the performance of this algorithm is similar to that of the conventional qrdm algorithm. The receiver detection simulation is based on five paths Rayleigh fading environment without channel coding, assuming the channel matrix H is perfectly known by the detector. From simulation results, the complexity of qrdm-ZF detection algorithm for 4 transmitter antennas and 4 receiver antennas systems with quadra-binary-shift-keying (QBSK) modulation is reduced by 29.41% on average and it is reduced by 30.08% on average for 16-quadra-amplitude-modulation (QAM). The performance degradation is about 2dB at BER=10~(-3). The proposed hybrid qrdm-ZF detection can be used for a MIMO-OFDM receiver requiring not very high performance but needing very low complexity.

关键词： MIMO-OFDM QR-decomposition Zero-Forcing qrdm algorithm qrdm-ZF algorithm

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