摘要
本文研究了多载波码分多址(Multi-Carrier CDMA)扩展频谱系统在多径衰落信道下的频率分集接收技术。文中首先研究了理想载波恢复、频率选择性瑞利衰落信道条件下多载波码分多址系统的性能,然后提出了用时间频率窗平滑来改善载波相位估计的算法,并对该算法在衰落信道下的性能进行了仿真。理论推导和计算机仿真结果说明,多载波码分多址系统的频率分集接收方案与理论上最佳的RAKE分集接收相比,性能略有下降,但接收机结构得到了简化。
In this paper, the frequency diversity reception of multi-carrier CDMA signal is studied. The performance of multi-carrier CDMA system under perfect carrier recovery and frequency selective Rayleigh fading channel condition is analyzed. A smoothing algorithm utilizing time-frequency window for improving carrier phase estimation of multi-carrier CDMA signal is suggested. Simulation results for this algorithm are obtained under fading channel condition. It is shown that the frequency domain diversity reception scheme suggested in this paper suffers an insignificant degradation of performance comparing with theoretically optimal RAKE receiver, while considerably simplifying the receiver architecture.
基金
国家教委博士点基金
关键词
多址通信
多载波码分多址
频率分集接收
Multiple access, communication, Multi-carrier spread-spectrum CDMA, Frequency diversity reception
