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A feedback adaptive space-time constant modulus algorithm in DS-CDMA multiuser detection

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3 Author(s)
Aigang Feng ; Inst. of Inf. Eng., Xi''an Jiaotong Univ., China ; Wu, Xiaojun ; Qinye Yin

The constant modulus property of communication signals, such as FM and phase-modulated signals, are often used in blind separation of multiple users. Because there are no training sequences needed, the system transmission efficiency is increased. When extended to the space-time domain, the new schemes have potentially greater performance than conventional ones. In this paper a feedback adaptive space-time constant modulus algorithm (FAST-CMA) is proposed for DS-CDMA multiuser detection. First the uplink channel model is built with receiving K synchronous communication signals that are transmitted through a MIMO-FIR channel. Based on this channel model, we compare and analyze the FAST-CMA with cascade-type constant modulus algorithm (CT-CMA) and space-time type constant modulus algorithm (ST-CMA). The FAST-CMA can combat both ISI and MAI without stringent power control and training sequence, and it is preferable to CT-CMA and approximately has the same performance as the ST-CMA. It has faster convergence rate, and less computational complexity than ST-CMA. Numerical simulations can illustrate the effectiveness of this algorithm

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Vehicular Technology Conference, 2001. VTC 2001 Fall. IEEE VTS 54th  (Volume:4 )

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