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本文分析数字调相系统在高斯噪声下的性能,并确定无衰落情况下所需信噪比与分立的相数及误码率的关系,既考虑到由本机产生参考载波的相干检波又考虑到相位比较检波。计算表明,多相调制较之多电平调幅在带宽换取信噪比方面更为有效。同时发现除二进制调制外,相位比较检波的性能较相干检波约低3 dB。而二进制调相在误码率约不超过0.001时,性能下降小于1dB。
This paper analyzes the performance of digital phase modulation system under Gaussian noise and determines the relationship between the required signal-to-noise ratio and the number of discrete phases and the bit error rate in the case of no fading, considering both the coherent detection of the reference carrier generated by this device and the To the phase comparison detection. Calculations show that multiphase modulation is more effective than multi-level amplitude modulation in terms of bandwidth for signal-to-noise ratio. Also found that in addition to binary modulation, the performance of phase comparison detection coherent detection is about 3 dB lower. The binary phase modulation in the bit error rate of less than about 0.001, the performance decline of less than 1dB.