异步CDMA系统中基于预处理递归最小二乘恒模算法的盲自适应接收
doi: 10.3724/SP.J.1146.2006.00778
Blind Adaptive Receiver in Asynchronous CDMA Systems Based on Pre-processing Recursive Least Squares Constant Modulus Algorithm
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摘要: 该文提出一种基于预处理递归最小二乘恒模算法(PP-RLSCMA)的多径异步CDMA系统盲自适应接收技术。首先对接收信号进行自适应预处理，并分析了预处理器的复杂性和稳定性。预处理的目的是通过对干扰和噪声的部分抑制以提高恒模接收的性能，所提出的预处理方法只与多径信道的最大长度有关。鉴于统计恒模算法收敛速度慢的缺点，提出一种快速递归最小二乘恒模算法的盲自适应接收。仿真表明，该文算法的误码率及收敛性能比LCMMV，LCCMA好。Abstract: This paper proposes a blind adaptive receive technique in asynchronous multipath CDMA systems based on the Pre-Processing Recursive Least Squares Constant Modulus Algorithm (PP-RLSCMA) .The received signals are adaptively pre-processed first ,and analysis of the complexity and stability of the pre-processor is provided. The pre-processor enhances the performance of CMA_based receiver by partly suppressing the interference and noise and the proposed method is only dependent on parameter of maximum multipath length. Because of slow convergence rate of statistic descend constant modulus, the paper presents a blind adaptive receiver based on fast (RLSCMA). Simulation indicates that the proposed algorithm has a better performance of BER and convergence compared with LCMMV and LCCMA.
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