采用正弦移频键控调制的直接序列扩频系统的性能分析

Analysis of Performance for SFSK-DS/SSMA System

正弦移频键控(SFSK)调制信号具有恒包络和平滑的相位变化特性,把它作为直接序列扩频(DS/SS)信号的切普(Chips)基本波形,将使扩频信号具有带外辐射低,而相应的系统受非线性影响小等特点.分析表明,采用SFSK调制的直接序列扩频系统(SIGK-DS/SSMA)较QPSK-DS/SSMA及MSIC-DS/SSMA系统有更好的多址能力.

With properties of constant envelope and smooth path of phase,sinusoidal frequency shift keying (SFSK) signal can be used to form the chips wave for direct sequence spread spectrum multiple accers(DS/SSMA),which will result in the lower out-of-band radistion and less effect suffering from the non-linearity for the spread spectrum system. It is shown that the DS/SSMA system in SFSK format (SFSK-DS/SSMA) has a better ability to multiple acced than the counterpart in QPSK (QPSK-DS/SSMA) or MSK (MSK-DS/SSMA) format.