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Cochannel Interference Rejection in Multipath Channels
Yu T. SU Li-Der JENG Fang-Biau UENG
IEICE TRANSACTIONS on Communications
Publication Date: 1997/12/25
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Radio Communication
spread spectrum communications, interference suppression, adaptive filter, multipath fading,
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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).