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Adaptive Step-size Constant Modulus Algorithm for blind multiuser detection in DS-CDMA systems

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Journal of Electronics (China)

Abstract

Blind Adaptive Step-size Constant Modulus Algorithm (AS-CMA) for multiuser detection in DS-CDMA systems is presented. It combines the CMA and the concept of variable step-size, uses a second LMS algorithm for the step size. It adjusts the step-size according to the minimum output-energy principle within a specified range, thus overcomes the problems of bad effect of fixed step-size LMS algorithm. Compared with Adaptive Step-size LMS (AS-LMS) algorithm, through simulations, this algorithm can adapt the changes of the environment, suppress multiple access interference in the dynamic environment and the stability of Signal to Interference Ratio (SIR) is superior to that of AS-LMS.

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Authors and Affiliations

  1. Dept. of Electronic Eng., Shanghai Jiaotong Univ., 200030, Shanghai

    Sun Liping & Hu Guangrui

Authors
  1. Sun Liping
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  2. Hu Guangrui
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Additional information

Supported by the National Natural Science Fundation of China (No.60172018)

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Sun, L., Hu, G. Adaptive Step-size Constant Modulus Algorithm for blind multiuser detection in DS-CDMA systems. J. of Electron.(China) 21, 10–15 (2004). https://doi.org/10.1007/BF02687792

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  • DOI: https://doi.org/10.1007/BF02687792

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