摘要
针对传统的近似分析方法不够严谨的问题, 利用窄带噪声随机过程同相分量和正交分量的数学表示方法, 分析了双边带 (DSB: DoubleSide Band) 调制系统中相干接收机的解调增益。在此基础上, 利用窄带噪声同样的描述方法, 提出了一种新的单边带 (SSB: SingleSide Band) 调制系统相干接收机解调增益的分析方法, 将窄带噪声的中心频率由ωc变为ωc±ωm /2。分析结果表明, SSB的相干解调增益为 1, 与传统的SSB解调增益分析方法得到的结论一致, 但是与传统的近似分析方法相比, 该方法更严谨, 为通信系统的设计、调制方式的选择提供了更加可靠的依据。
According to the narrow stochastic noises can be described by the stochastic in-phase part and orthodoxy part, the demodulation gain of the DSB(Double Side-Band) modulation coherent receiver was analyzed. By the use of the same definition to the narrow stochastic noises, a new method was presented to analyze the reliability of the SSB (Single Side-Band) modulation receiver,that changed conter frequency of narrow noises fromω_c to ω_c±ω_m/2. The result shows that the SSB coherent demodulation gain is equal to one. It is same with the result of traditional analysis. But this new analysis method is more rigorous than the traditional analysis method. It will provide more reliability theory foundation for designing the communication system and choosing the modulation model.
出处
《吉林大学学报（信息科学版）》
CAS
2005年第2期152-156,共5页
Journal of Jilin University（Information Science Edition）
基金
吉林大学教育技术建设资助项目 (2004JY002)
关键词
单边带调制
双边带调制
窄带噪声
可靠性
single sideband modulation
double sideband modulation
narrow noise
reliability
