Cochannel Interference Rejection in Multipath Channels

Yu T. SU  Li-Der JENG  Fang-Biau UENG  

Publication
IEICE TRANSACTIONS on Communications   Vol.E80-B   No.12   pp.1797-1804
Publication Date: 1997/12/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Radio Communication
Keyword: 
spread spectrum communications,  interference suppression,  adaptive filter,  multipath fading,  

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Summary: 
In addition to additive thermal noise, a received direct-sequence spread spectrum (DS/SS) signal may suffer from intersymbol interference (ISI) and interference caused by cochannel narrowband users or other narrowband radio frequency interference (RFI). This paper presents a workable solution for removing narrowband interference (NBI) and reducing ISI or inter-chip interference (ICI) when the communication channel can be modeled as an FIR filter and the NBI comes from multiple CW tones, an AR-modeled Gaussian process, or a BPSK signal. Unlike earlier solutions, the proposed scheme is capable of performing the functions of NBI-rejection, ISI/ICI suppression and data detection (code despreading) simultaneously. It is easy to implement and, more importantly, it yields lower bit error rate (BER) and smaller mean squared error (MSE).