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IEICE Transactions on Communications 2008 E91-B(4):1103-1111; doi:10.1093/ietcom/e91-b.4.1103
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Copyright © 2008 The Institute of Electronics, Information and Communication Engineers

Regular Section -- Papers -- Wireless Communication Technologies

Anti-Interference Receiver Structures for Direct Sequence Spread Spectrum Signals

Li-Der JENG1 and Fang-Biau UENG2

1 The author is with the Department of Electronic Engineering, Chung-Yuan Christian University, Chung-Li, Taiwan. E-mail: lider{at}cycu.edu.tw, 2 The author is with the Department of Electrical Engineering, National Chung-Hsing University, Taichung, Taiwan.


  Abstract

Conventional narrowband interference (NBI) rejection algorithms often assumed perfect pseudo-noise (PN) code synchronization. The functions of NBI rejection and code tracking are performed separately and independently by an adaptive filter and a code tracking loop, respectively. This paper presents two new receiver structures for direct sequence spread spectrum (DS/SS) systems, one operates in coherent mode and the other operates in noncoherent mode. Both receivers are designed to suppress NBI and minimize tracking jitter. Numerical results show that the proposed coherent receiver performs as good as the conventional receiver that uses an LMS NBI rejection filter with zero tracking jitter. The noncoherent receiver, when compared with the coherent one, suffers less than 3 dB degradation for bit error probability smaller than 10–3.

Key Words: narrowband interference, code synchronization, LMS, non-coherent

Manuscript received May 16, 2007. Manuscript revised November 5, 2007.


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