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Title: A hybrid receiver scheme for multiuser multicode CDMA systems in multipath fading channels
Authors: Thian, B.S.
Wang, Y.
Tjhung, T.T.
Wong, L.W.-C. 
Keywords: Equalization
Eterative interference cancellation (IC)
Multicode code-division multiple access (M-CDMA)
Issue Date: Sep-2007
Citation: Thian, B.S., Wang, Y., Tjhung, T.T., Wong, L.W.-C. (2007-09). A hybrid receiver scheme for multiuser multicode CDMA systems in multipath fading channels. IEEE Transactions on Vehicular Technology 56 (5) : 3014-3023. ScholarBank@NUS Repository.
Abstract: In this paper, we present a system model for multiuser multicode code-division multiple access (CDMA) in a multipath fading channel and propose a hybrid receiver scheme for the system. Conventional receivers for CDMA systems utilized interference cancellation (IC) schemes, with the RAKE receiver as an initial data estimator. However, the RAKE receiver generates inaccurate data estimates due the interference that is caused by the cross correlation between the spreading codes. This inaccurate data estimate leads to significant error propagation to the subsequent stages and thus degrades the bit error rate (BER) performance. Our proposed scheme overcomes the problem by using a more accurate initial data estimator. It consists of an equalizer for obtaining initial data estimation, followed by several stages of parallel IC (PIC). Computer simulation results show that the BER curves of our proposed scheme do not encounter an error floor under all channel conditions; in contrast, the BER curves of the conventional RAKE-PIC receiver are constrained by an irreducible error floor. In addition, in an uplink four-path channel and at a BER of 10-3, our simulation results show that a one-stage PIC achieves a 2.5-dB gain over the first stage equalization receiver. © 2007 IEEE.
Source Title: IEEE Transactions on Vehicular Technology
ISSN: 00189545
DOI: 10.1109/TVT.2007.900387
Appears in Collections:Staff Publications

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