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| Adaptive Matched Demodulation Algorithm Based on LMS with Variable Step Size |
| Zeng Zhao-hua①②; Liu Gui-zhong① |
| ①Dept. of Info and Comm. Eng.,Xi’an Jiaotong University Xi’an 710049 China;②School of Comm. Eng.,Xi’an Univ. of Sci. & Tech.,Xi’an 710054 China |
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Abstract Based on Minimum-Mean-Square-Error(MMSE) criterion, a kind of LMS algorithm with variable step size is proposed to suppress Multi-Access Interference (MAI) in asynchronous DS-CDMA system. Compare with similar variable step size LMS algorithm, computer simulation results show that the kind of detector is insensitive to the near-far effect and its structure is very simple. At the same time, it has lower bit error rate and faster speed of convergence and tracking without increasing computational complexity. In particular, the controlling parameters of proposed algorithm are not required to re-adjust, even if the channel parameter changes. So it can be widely used.
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Received: 11 July 2002
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2004, Vol. 26 
