时变瑞利信道下异步长码MC-CDMA系统性能分析

时变瑞利信道下异步长码MC-CDMA系统性能分析 Performance Analysis of Multicarrier CDMA Systems in Rayleigh Channel 王卫兵 WANG Weibing 1 2 first-author 朱秋萍 ZHU Qiuping 1 2 徐心毅 XU Xinyi 1 2 武汉大学电子信息学院 武汉大学电子信息学院 School of Electronic Information,Wuhan University School of Electronic Information,Wuhan University 武汉大学电子信息学院,湖北,武汉,430072 武汉大学电子信息学院,湖北,武汉,430072 考虑异步时延、随机扩频序列、多普勒频移和多径对异步长码MC-CDMA上行链路系统性能的影响,选择合并信号的信号干扰噪声功率比（SINR）最大原则进行分集接收,假定各条路径的衰落均满足瑞利分布,给出了此最优分集合并滤波器在时变瑞利信道下MC-CDMA系统的平均SINR的解析形式,并进一步分析得到了系统的误比特率（BER）性能.计算机仿真验证了本文理论的正确性. Rapid time variation of the mobile communication channel have a dramatic effect on the performance of multicarrier modulation.The performance of the uplink of asynchronous multicarrier code-division multiple-access（MC-CDMA） systems with aperiodic random spreading and Raleigh fading is studied in this paper.We obtain the optimum combining filter that maximizes the signal-to-interference-plus-noise（SINR） of the combined statistics and exploits correlated information among subchannels.A closed-form expression for the unconditional covariance matrix of the interference-plus-noise vector and bit error rate （BER） in Rayleigh channel are derived.The performance of the MC-CDMA systems is evaluated by numerical simulation. 瑞利信道 多载波码分多址 随机扩频序列 异步传输 Rayleigh channel multicarrier code-division multiple-access（MC-CDMA） random signature sequence asynchronous transmission TN929.533 国家自然科学基金重点项目（90307017） 2008-03-01 2021-04-01 3