AWGN信道中超窄带调制VMSK的最佳解调性能

Best performance of the UNB modulation VMSK in AWGN channel

以甚小移键控(VMSK)为例,针对加性白高斯噪声(AWGN)信道中的解调性能进行研究,基于信号接收的分类器模型,从最基本的概率方法出发,利用最小错误率贝叶斯准则,得到最低误比特率的接收方式及其性能。并从相关检测一致性、最佳性能以及可推广性的角度进行了详细阐述。分析结果表明,VMSK调制方式中表示1和0的信号波形中相同部分的能量并不能提高误码率性能。若要获得相同的误码性能,VMSK需要比BPSK更高的信噪比。此结论可以推广到其他UNB调制。

VMSK （very minimum shift keying） was taken into account as UNB example. Its performance in AWGN （added white Gaussian noise） channel is analyzed based on the classifier model for signal processing. The detecting method with the lowest bit error rate is analyzed according to the Bayesian criterion using the basic probability method. Then the comparison with correlation detection, optimal performance is given. The analysis shows that the VMSK needs higher SNR （signal noise ratio） than BPSK to get the same BER performance. And the conclusion can be extended to other UNB modulation methods.