基于恒模算法的DS-CDMA系统下行信号接收机  

An Receiver for The DS-CDMA Downlink Based on Constant Modulus Algorithm

作　　者：黄晖[1] 廖桂生[1] 张林让[1] 

机构地区：[1]西安电子科技大学雷达信号处理重点实验室,西安710071

出　　处：《信号处理》2003年第2期128-131,共4页Journal of Signal Processing

基　　金：国家教育部<跨世纪优秀人才培养计划>基金;国家自然科学基金(No.60172028)

摘　　要：本文研究多径频率选择性衰落信道下,DS-CDMA系统下行信号检测技术。提出了一种新的基于恒模算法的检测方法。将均衡器的输出投影到一个未使用的扩频序列上,以结果为零作为约束条件,本文分别给出了批处理和自适应的线性约束恒模算法。本文方法克服了常规恒模算法无法保证收敛到期望用户的缺点,并且对周期和非周期扩频系统都有效。仿真结果验证了本文方法具有良好的检测性能,可以在克服信道衰落的同时抑制多址干扰。In this paper, the method of detection for the DS-CDMA downlink operating in a frequency selective fading environment is considered. A novel detection method using constant modulus algorithm(CMA) is proposed. With the projection of the equalizer output on the unused spreading codes being zero as constraint condition, we give an adaptive and a batch linearly constrained CMAs. The proposed method can be used in periodic or aperiodic spreading systems and overcomes the shortcoming that the conventional CMA can not guarantee to converge to a desired user. Simulation results demonstrate that the proposed method offers high detection performance and is capable of combating both channel fading and multiple-access interference.

关 键 词：DS-CDMA系统 恒模算法 行信号接收机 信号检测 移动通信 

分 类 号：TN929.5[电子电信—通信与信息系统]