Fractionally-spaced differential detection of GFSK signals with small h

Abstract

A digital noncoherent demodulation scheme is presented for receptioon 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 prorposed teceiver is evaluated in terms of the bit error rate(BER). Numerical result show that the proposed demodulator provides peerformance 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.