KEYWORDS: Demodulation, Binary data, Frequency shift keying, Bandpass filters, Transceivers, Modulation, Signal to noise ratio, Linear filtering, Signal processing, Receivers
Compared with the superheterodyne transceivers, zero-intermediate frequency (IF) transceivers have simpler structure and lower power consumption. Moreover, communication signals can be processed digitally with a sampling rate equaling to the signal bandwidth before transmission or reception. Binary frequency shift keying (2FSK), as a type of binary single-carrier modulation with excellent anti-interference performance, can also be transmitted or received via a zero-IF structure. Therefore, broadband or frequency hopping 2FSK transceivers can be realized easily in baseband. The traditional zero-IF 2FSK signal demodulation-phase demodulation has a simple structure, but its anti-noise performance is poor due to the unused priori information. In this paper, both coherent and non-coherent demodulation schemes are proposed for zero-IF 2FSK. Mathematical derivations and numerical simulation results show the bit error rate (BER) performance of coherent demodulation of zero-IF 2FSK is 3dB better than that of bandpass 2FSK.
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