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Multiuser detection for frequency-hopped spread spectrum systems with BFSK modulation

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3 Author(s)
Tsung-Cheng Wu ; Dept. of Electron. Eng., Cheng Shiu Inst. of Technol., Kaohsiung, Taiwan ; Chi-chao Chao ; Kwang-Cheng Chen

This paper proposes new multiuser detectors for frequency-hopped spread spectrum multiple-access (FH-SSMA) based on binary frequency shift keying (BFSK) modulation and channelized frequency hopping. With knowledge of hopping sequences and envelopes of active users, the proposed scheme is a sub-optimal detector under maximum likelihood test. Diversity combining is employed as an anti-multiple-access interference technique which improves the performance significantly. In slow frequency-hopped systems, we demonstrate that the proposed multiuser detector combined with diversity is robust to multiple-access interference. In fast frequency-hopped systems with heavy load of multiple-access, the detector can afford more simultaneous users than the multiuser detector with M-ary frequency shift keying (MFSK) modulation.

Published in:

Vehicular Technology Conference, 2001. VTC 2001 Fall. IEEE VTS 54th  (Volume:1 )

Date of Conference:

2001