Energy Efficient Quadrature Spatial Modulation MIMO Cognitive Radio Systems with Imperfect Channel Estimation

Ali Afana, I. Atawi, S. Ikki, R. Mesleh
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引用次数: 24

Abstract

Quadrature spatial modulation (QSM) in cognitive radio (CR) is a new spectral and energy efficient multiple-input multiple-output (MIMO) transmission paradigm. In QSM, the spatial constellation diagram of conventional spatial modulation (SM) system is extended to include both in-phase and quadrature components of the data symbol. As such, QSM combined with CR techniques achieve significant improvement in the overall spectral efficiency while inherent advantages of SM are retained. In this paper, we study the performance of QSM-MIMO-CR systems in the presence of channel estimation errors (CEEs) and limited feedback. A closed-form expression for the average pairwise error probability (PEP) of CR system is derived and used to calculate a tight upper bound of the average bit error rate (ABER) over Rayleigh fading. In addition, a simple asymptotic expression is derived and analyzed. Simulation results, which corroborate the numerical ones, show the importance of QSM in improving the overall secondary performance and its robustness to CEEs with reduced signal power.
具有不完全信道估计的高能效正交空间调制MIMO认知无线电系统
认知无线电(CR)中的正交空间调制(QSM)是一种新的频谱和能量高效的多输入多输出(MIMO)传输模式。在QSM中,将传统空间调制(SM)系统的空间星座图扩展到包含数据符号的同相分量和正交分量。因此,QSM与CR技术相结合,在保留了SM固有优势的同时,整体频谱效率得到了显著提高。本文研究了存在信道估计误差(CEEs)和有限反馈的QSM-MIMO-CR系统的性能。导出了CR系统的平均对向误码率(PEP)的封闭表达式,并用于计算瑞利衰落下平均误码率(ABER)的紧上界。此外,还推导并分析了一个简单的渐近表达式。仿真结果与数值结果一致,表明了QSM在提高系统整体二次性能和降低信号功率下对cee的鲁棒性方面的重要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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