论文部分内容阅读
扩频多路通信(SSMA)方式是把窄带信息的频谱在信道频带内均匀地扩展进行传输的一种通信方式。它的特点是许多通话者可以同时使用一个共用频带,在跳频SSMA(FH)方式中,是用频率台成器来产生在扩展信息信号频带中使用的 PN 信号,用以前的频率合成嚣,要求收发信双方互相独立地产生各时隙的频率和相位都一致的 PN 信号是比较困难的,故不能进行相干检波。为了实现 FH 方式中的相干通信,提出了各种使用表面弹性波(SAW)滤渡器的频率合成器方案,但是这些方案不仅合成的频率会产生某种误差,而且也不能控制相位。本文主要介绍一个 FH 方式使用的、基于新原理的频率合成器方案,并谈谈在 FH 方式中实现相干通信的可能性。
Spread Spectrum Multiplexing (SSMA) is a communication method in which the spectrum of narrowband information is uniformly spread in the channel band for transmission. Its characteristic is that many callers can use a common frequency band at the same time. In the frequency hopping SSMA (FH) method, a frequency signal generator is used to generate a PN signal for use in an extended information signal frequency band. With the previous frequency synthesizer, It is difficult for both sending and receiving parties to generate PN signals with the same frequency and phase in each time slot independently of each other, and therefore coherent detection can not be performed. In order to achieve coherent communication in the FH scheme, various frequency synthesizer schemes using surface acoustic wave (SAW) filters have been proposed, but these schemes not only produce some kind of error in the synthesized frequency but also do not control the phase. This article focuses on a frequency synthesizer scheme based on the new principle used in FH mode and talks about the possibility of implementing coherent communication in FH mode.