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频移键控(FSK)具有易实现、鲁棒性强等优点,在数字通信系统中得到广泛应用。文中对数字正交相乘解调原理进行了简要介绍,针对所设计系统难以准确得到相移π/2的延时信号,采用Hilbert变换实现整个频带内的信号精确的π/2相移。并给出了误码率数值曲线,仿真结果表明:该算法具有较强的鲁棒性,便于用DSP芯片实现等特点,优于传统的非相干BFSK解调器。该算法应用到DSP系统实时解调32路BFSK信号,运行效果良好。
Frequency-shift keying (FSK) has the advantages of easy implementation and robustness, and is widely used in digital communication systems. In this paper, the principle of digital orthogonal multiplication and demodulation is briefly introduced. For the designed system, it is difficult to get the phase-shifted π / 2 delay signal accurately. The Hilbert transform is used to realize the accurate π / 2 phase shift of the signal in the whole frequency band. And gives the numerical curve of bit error rate. The simulation results show that the proposed algorithm is robust and easy to implement with DSP chip, which is better than the traditional non-coherent BFSK demodulator. The algorithm applied to DSP system real-time demodulation 32 BFSK signals, running well.