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本文描述移动无线电中利用导频单音传输方式的跳频单边带调制(FH-SSB-PT)。单边带信号每隔T秒钟改变其载波频率,而载波频率序列则由一个适当的倒频码(scrambling code)控制。在这个移动无线电系统中利用相同频段的同信道单元(cells)采用不同的倒频码,结果,如τ很小,则同信道干扰的形式就从串音干扰变成随机噪声。在有瑞利衰落的情况下,频率跳变技术改善了车载电台固定接收时的性能,并且不致于使移动着的车载电台的性能变坏。而且,这种跳频技术还可以给通信提供保密性。文章还推导出瑞利衰落环境下SSB、SSB加导频单音以及FH-SSB-PT时的s/n表达式。文章还考虑了同信道干扰的影响。
This article describes frequency hopping single sideband modulation (FH-SSB-PT) using pilot tone transmission in mobile radios. The single sideband signal changes its carrier frequency every T seconds while the carrier frequency sequence is controlled by an appropriate scrambling code. In this mobile radio system, co-channel cells using the same frequency band use different scrambling codes. As a result, if τ is small, the co-channel interference form changes from crosstalk noise to random noise. In the case of Rayleigh fading, the frequency hopping technique improves the performance of a fixed reception of a car radio without deteriorating the performance of a moving car radio. Moreover, this frequency hopping technology can also provide confidentiality for communications. The article also deduces the s / n expressions for SSB, SSB plus pilot tone and FH-SSB-PT in the Rayleigh fading environment. The article also considers the influence of co-channel interference.