摘要
数字通信系统中,调制解调效果的好坏直接关系着其性能优劣。本文就BPSK调制信号,讨论了实现其全数字解调的几种方法,如平方环法,Costas环法,并提出一种以Hilbert鉴相算法为基础构建的环路解调方法。针对此法,利用MATLAB进行仿真,仿真结果表明,此种环路解调方法之于锁相环路解调而言,能处理载波频率较高的调制信号,并更快的解调出基带数据,且此法在信噪比较低的情况下,本文取信噪比为12dB,经过软件仿真,解调的结果达到接近于10-4的误码率。
In digital communication system,the quality of modulation and demodulation effect its performance directly. In this article,serveral methods of all-digital demodulation are dicussed,such as square loop and Costas loop. And a method of ring circuit based on Hilbert phase demodulation algorithm is proposed. In view of this method,simulation using Matlab is carried on,and the result indicates that this method can process the modulation signal of higher carrier frequency,and demodulate baseband datas quickly than the phase-locked loop. Besides,in the situation low SNR,it is 12db in this article,its BER achieves 10-4.
出处
《电子测试》
2010年第10期32-35,42,共5页
Electronic Test
