论文部分内容阅读
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。
This paper studies the multi-carrier CDMA (Multi-Carrier CDMA) spread spectrum system in multi-path fading channel frequency diversity reception technology. In this paper, the performance of multicarrier CDMA system with ideal carrier recovery and frequency selective Rayleigh fading channel is studied. Then, an algorithm to improve carrier phase estimation by using time-frequency window smoothing is proposed. The algorithm is applied in fading channel Under the performance of the simulation. The theoretical derivation and computer simulation results show that the performance of the multi-carrier CDMA system is slightly lower than that of the best RAKE receiver, but the receiver structure is simplified.