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在提取抑载单边带(SSB/SC)信号S(t)中的信息信号f(t)时,一般采用相干解调法。采用相干解调必须有与发送机调制用载波同频同相的本地载波,这样增加了接收机的复杂性,且本地载波一旦存在频偏或相偏时就会使所提取的信息信号的频谱产生附加的频偏或相偏。本文介绍一种SSB/SC信号非相干解调的算法,可以避免上述问题。同时,本文分析了这种解调方法的抗噪声性能。
In extracting the information signal f (t) in the suppressed single sideband (SSB / SC) signal S (t), coherent demodulation is generally employed. The use of coherent demodulation must have a local carrier of the same frequency as the carrier modulated by the transmitter, thus increasing the complexity of the receiver. Once the local carrier has frequency offset or phase offset, the spectrum of the extracted information signal is generated Additional frequency offset or phase offset. This article describes an SSB / SC signal non-coherent demodulation algorithm to avoid the above problems. At the same time, this paper analyzes the anti-noise performance of this demodulation method.