Performance enhanced GFSK demodulator using phase-domain ADC for zero-IF receivers

A 4-bit phase-domain ADC based demodulator with a more accurate decision is presented to demodulate zero-IF Gaussian frequency shift keying (GFSK) or narrowband frequency shift keying (FSK). As a Matlab simulation result performed in Additive White Gaussian Noise (AWGN) Channel, for 0.1 percent BER, the demodulator is able to achieve an E_b/N₀ of 1.5 dB which is less than that proposed in [5].