西安交通大学电子与信息学部,西安,710049
: 2022-10-31。作者简介: 刘佳思(1998—),女,硕士生
王磊(通信作者),女,副教授。基金项目: 国家自然科学基金资助项目(61871317)。
网络首发:2023-06-10,
纸质出版:2023
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刘佳思, 王磊, 吴秋爽. 面向6G系统采用智能反射表面辅助的空时空间调制方案[J]. 西安交通大学学报, 2023,57(6):56-64.
LIU Jiasi, WANG Lei, WU Qiushuang. Space-Time Spatial Modulation Scheme Assisted by Intelligent Reflecting Surface for 6G Systems[J]. 2023, 57(6): 56-64.
刘佳思, 王磊, 吴秋爽. 面向6G系统采用智能反射表面辅助的空时空间调制方案[J]. 西安交通大学学报, 2023,57(6):56-64. DOI: 10.7652/xjtuxb202306007.
LIU Jiasi, WANG Lei, WU Qiushuang. Space-Time Spatial Modulation Scheme Assisted by Intelligent Reflecting Surface for 6G Systems[J]. 2023, 57(6): 56-64. DOI: 10.7652/xjtuxb202306007.
针对现有的近场智能反射表面(IRS)辅助的空间调制(SM)方案频谱效率较低的问题
提出了面向6G系统采用IRS辅助的空时空间调制方案。首先
根据发射天线维度对SSB码字进行堆叠
构建堆叠SSB(SSSB)码字
并通过对SSSB码字基矩阵进行线性组合得到SM矩阵; 然后针对SM矩阵设计近场IRS调制技术的信道状态激活方式
将SM矩阵与信道状态激活方式结合生成SSSB-IRS发送端信号矩阵; 最后
推导了SSSB-IRS的最大似然译码公式和平均误码率的理论公式。由于采用了灵活的编码和天线激活机制
该方案比现有的典型近场IRS调制方案具有更高的频谱效率
并且可以提供二阶发射分集来对抗信道衰落。仿真结果表明:所提SSSB-IRS方案比现有的近场IRS调制技术方案具有更好的误比特率性能
在频谱效率为6.5 b/(s·Hz)、误比特率达到10
-5
时
所提方案的信噪比增益比坐标交织正交设计的近场IRS方案提升了约4.3 dB。
Aiming at the low spectral efficiency of the existing spatial modulation(SM)schemes assisted by near-field intelligent reflecting surface(IRS)
a space-time spatial modulation scheme assisted by IRS for 6G systems was proposed in this paper. Firstly
the stacked SSB(SSSB)codeword was constructed by stacking SSB codeword based on the transmit antenna dimension. A SM matrix was obtained by linearly combining the base matrices of SSB codewords. Next
the channel state activation of near-field IRS modulation technology was designed for the SM matrix. The SM mat
rix was combined with the channel state activation to generate SSSB-IRS transmit signal. The maximum likelihood decoding formula and theoretical average bit error rate(BER)formula for SSSB-IRS were derived. Thanks to the flexible coding and antenna activation mechanisms
the proposed scheme can realize higher spectral efficiency than the existing typical near-field IRS schemes and provide the second order transmit diversity to reduce channel fading. Simulation results show that the proposed SSSB-IRS scheme has better BER performance than the existing IRS schemes. When the spectral efficiency was 6.5 b/(s·Hz)and BER was 10
-5
the SSSB-IRS scheme improved the signal-to-noise ratio by about 4.3 dB compared to the coordinate interleaved orthogonal design IRS scheme.
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