On the Effect of Forward-Backward Filtering Channel Estimation in W-CDMA Multi-Stage Parallel Interference Cancellation Receiver

Masayuki ARIYOSHI  Tetsufumi SHIMA  Jeonghoon HAN  Jonas KARLSSON  Kenzo URABE  

IEICE TRANSACTIONS on Communications   Vol.E85-B   No.10   pp.1898-1905
Publication Date: 2002/10/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Mobile Multimedia Communications)
channel estimation,  forward-backward filtering,  interference canceller,  IMT-2000,  W-CDMA,  

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In this paper, the performance of multi-stage parallel interference cancellation receiver using forward-backward filtering channel estimation is evaluated for the W-CDMA uplink. The channel estimation employs a non-causal forward-backward-multiplication-method filter, which was originally proposed for the reception of W-CDMA random access. Results of link level simulations for data and voice traffic scenarios over Pedestrian A and Vehicular A channels are discussed in comparison with the conventional channel estimation methods of 1-slot pilot averaging, 1-slot averaging, and weighted multiple slot averaging. It is shown that the forward-backward filtering channel estimation improves performances of the interference cancellation receiver as well as that of the ordinary Rake receiver in both Pedestrian A and Vehicular A channels. With its features of short processing delay and low complexity, the forward-backward filtering channel estimation is suitable for practical implementations of multi-stage interference cancellation receivers.