摘要
最小相移键控(MSK)信号具有恒包络特性,并且功率和频带利用率较高,但由于其相干解调实现较复杂,而传统的非相干解调性能较差限制了其应用。根据MSK信号相位连续的特点,提出了一种基于波形匹配的多符号检测方法,其基本思想是在多个符号的积分时间内用接收端产生的所有可能出现的信号波形与接收到的信号进行匹配相关,在这些波形中总有一个波形与接收到的信号是完全匹配的,该波形的相关结果要明显大于其他波形的相关结果,这个与接收信号完全匹配后的波形所对应符号就是最终的判决结果。对该算法进行的仿真表明,与接收波形匹配的符号的相关结果为576,明显大于其他波形相关结果(最大为231.87)。该方法不需要进行精确的载波同步即可完成信号的检测,并且能够达到接近相干检测的性能,所付出的代价也是可以接受的。在某些相干检测难以应用的场合采用该方法可以使误码率检测性能提高3 d B左右。
Minimum Shift Keying（ MSK） signal has high power and spectrum efficiency with constant amplitude,but it＇s application is limited because of complex coherent detection and worse noncoherent detection performance. In this paper,a new detection method based on waveform matching was designed according to phase continuous property of MSK signal： all possible waveform signals locally generated were correlated with received signal and accumulated within the time of multiple symbols,the result of the right waveform was much bigger than the others,this would be the right symbol. Computer simulation shows that the result of the right waveform is 576,which is more bigger than the others obviously（ the biggest result of the others is 231. 87）. With this new method,Bit Error Rate（ BER） performance near coherent detection can be achieved,and accurate phase tracking is not necessary. This method can be used in some places which isn ＇t suitable for coherent detection,and can get 3 d B of BER nearly.
出处
《计算机应用》
CSCD
北大核心
2015年第A02期27-29,共3页
journal of Computer Applications
关键词
最小频移键控信号
相干检测
波形匹配
Minimum Shift Keying（MSK） signal
coherent detection
waveform matching
