Fractionally-Spaced Differential Detection of GFSK Signals with Small h

Sukkyun HONG
Yong-Hwan LEE

IEICE TRANSACTIONS on Communications   Vol.E84-B    No.12    pp.3226-3234
Publication Date: 2001/12/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technology
GFSK,  direct conversion,  frequency offset compensation,  differential detection,  small modulation index,  

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A digital noncoherent demodulation scheme is presented for reception of Gaussian frequency shift keying (GFSK) signals with small modulation index. The proposed differential demodulator utilizes oversampled signals to estimate the symbol timing and to compensate the frequency offset. The performance of the proposed receiver is evaluated in terms of the bit-error rate (BER). Numerical results show that the proposed demodulator provides performance comparable to that of conventional baseband differential demodulator, while significantly reducing the implementation complexity suitable for single chip integration with direct conversion radio frequency module. Finally the performance of the proposed receiver is improved by adding a simple decision feedback module.