Multistage Decision Feedback Channel Estimation for DS/CDMA Systems with M-Ary Orthogonal Modulation

Suk-Hyon YOON  Dae-Ki HONG  Young-Hwan YOU  Chang-Eon KANG  Daesik HONG  

IEICE TRANSACTIONS on Communications   Vol.E84-B   No.8   pp.2305-2308
Publication Date: 2001/08/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technology
DS-CDMA,  M-ary orthogonal modulation,  decision feedback channel estimation,  parallel interference cancellation,  

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In [3], the decision feedback channel estimation (DFCE) for M-ary orthogonal modulation in direct sequence/code division multiple access (DS/CDMA) systems was proposed. However, the performance of the DFCE in the multiuser environment is severely degraded due to multiple access interference (MAI). In this letter, to overcome this problem, we modify the DFCE as multistage configurations using a multistage parallel interference cancellation (PIC) scheme. According to the results of our simulations, the performance of coherent demodulation using the proposed multistage DFCE is significantly improved in comparison with conventional demodulation in [3].