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| Blind Adaptive Receiver in Asynchronous CDMA Systems Based on Pre-processing Recursive Least Squares Constant Modulus Algorithm |
| Zhao Fa-yong①②; Feng Guang-zeng① |
| ①Dept. of Communication Engineering, Nanjing University of Posts and Telecommunications, Nanjing 210003,China; ②Physic Department, Fuyang Normal College, Fuyang 236032,China |
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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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Received: 06 June 2006
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2008, Vol. 30 
