The Design and Implement of a Receiver for FSK Signal

A novel frequency shift keying (FSK) receiver is presented, including receiving antennas, a low noise amplifier (LNA), band-pass filters (BPF) and a novel all-digital 2-level FSK demodulator. The Matlab simulation results of the all-digital FSK demodulator show that it can improve bit error ratio (BER) performance compared with pseudo-coherent FSK demodulation (PCFSK). The novel FSK demodulator defined using Verilog HDL is easy to be implemented on Field Programmable Gate Array (FPGA) and in CMOS integrated circuit. The whole FSK receiver designed and implemented on a PCB board can receive FSK signal and send the recovered data to computer through RS-232 interface.