NDLI: Constrained constant modulus algorithm in multiuser detection

Content Provider	IEEE Xplore Digital Library
Author	Wang Yi Han Cunwu Wu Weiling
Copyright Year	1999
Description	Author affiliation: Dept. of Inf. Eng., Beijing Univ. of Posts & Telecommun., China (Wang Yi)
Abstract	A novel blind adaptive algorithm, constrained constant modulus algorithm (C-CMA) for multiuser detection is proposed in the paper. We analyze the convergence behavior of C-CMA in the noiseless case, from which an approximate relation between the constant in C-CMA and the power of the desired user, which guarantees the algorithm converges to the desired stationary point, is given. Simulations illustrate that both the constant and step size make a critical effect on the convergence, and it is better to select a suitable value to guarantee C-CMA converges to a desired stationary point while the convergence speed is bearable. It is also shown that if it is well initialized, C-CMA attains a better performance than the minimum output energy (MOE) algorithm in Honig et al. (1995). Therefore, it is a feasible approach to use the MOE algorithm firstly, after it reaches steady state, and transfer to C-CMA to improve the performance. Lastly, we compare the performance between C-CMA and CMA. It is shown that C-CMA has better performance in the low noise case. But the convergence behaviors of the algorithms are both sensitive to the constant and step size.
Starting Page	755
Ending Page	757
File Size	255177
Page Count	3
File Format	PDF
ISBN	7563504028
DOI	10.1109/APCC.1999.825012
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1999-10-18
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	China Institute of Communications(CIC)
Subject Keyword	Multiuser detection Convergence Adaptive algorithm Steady-state Blind equalizers Covariance matrix Algorithm design and analysis Multiaccess communication Timing Adaptive equalizers
Content Type	Text
Resource Type	Article

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