作　　者： ; ; ; (颜君志）;

机构地区： 佛山科学技术学院电子与信息工程学院电子信息工程系

出　　处： 《通信技术》 2010年第5期10-12,共3页

摘　　要： 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。 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.

关 键 词： 频移键控 正交延迟 希尔伯特变换 非相干解调

领　　域： [电子电信] [电子电信]