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直序码分多址系统(DS-CDMA)与多载波码分多址系统(MC-CDMA)是高速率无线通信中两个重要的CDMA技术。文章将一种改进的每个用户最小均方差(PU-MMSE)检测技术应用于频域均衡的DS-CDMA系统中,并通过计算机仿真分别对传统的每个载波最小均方差(PC-MMSE)与PU-MMSE两种检测技术应用于Wi MAX SUI信道下的DS-CDMA和MC-CDMA系统进行了性能比较。实验结果表明:使用了PU-MMSE检测技术的DS-CDMA系统能够更好地消除串行干扰,且与使用相同检测技术的MC-CDMA系统的性能几乎没有差别,但是却大大降低了峰值平均功率比(PAPR)。
DS-CDMA and MC-CDMA are two important CDMA technologies in high-rate wireless communication. In this paper, an improved per-user minimum mean square error (PU-MMSE) detection technique is applied to frequency-domain equalization DS-CDMA system. The PC- MMSE of each carrier is calculated by computer simulation. Performance comparison with DS-CDMA and MC-CDMA systems using PU-MMSE detection techniques on Wi MAX SUI channels. The experimental results show that the DS-CDMA system using PU-MMSE detection technology can eliminate the serial interference better and has almost no difference with the MC-CDMA system using the same detection technology, but greatly reduces the peak average power Ratio (PAPR).