Non-coherent Digital Demodulation Technique for BFSK Based on Hilbert Transform

Binary frequency-shift-keying(BFSK) is a simple and robust form of modulation widely used in digital communication system.In this paper the principle of orthogonal delay algorithm is briefed.The most hard problem for the designed system is to get accurate time-delay signal of π/2 phase shift,so Hilbert transform is introduced,thus to easily produceπ/2 delay signal.Meanwhile,the BER curve is given.The simulation results indicate that the algorithm is robust,and easy suitable in DSP implementation.This demodulator is obviously better than traditional demodulator.The non-coherent orthogonal demodulation algorithm has been applied in 32 channels BFSK demodulation and has achieved good operation.