DSSS系统中应用HMM的窄带干扰抑制技术

研究了DS(Direct Sequence)扩频系统中基于隐藏马尔可夫模型(Hide Markov Models—HMM)的干扰抑制技术，首先简要引述了算法原理，然后着重给出了该算法的改进方案和在具体干扰条件下的系统性能仿真。研究表明，相对于基于DFT的干扰抑制技术，该算法由于能够对干扰信号进行准确的估计，因而减小了对有用DS扩频信号的损伤，可以获得更好的抗干扰性能。通过减小复杂度的措施，可以使之用于实际系统，这对于应用DSSS系统的短波通信系统和卫星通信系统增强其抗干扰能力具有重要意义。

Narrow Interference Rejection by HMM with DSSS System

It is studied the narrow interference rejection based on HMM for DSSS system. Firstly the principle of the algorithm is quoted, the adapted means for the algorithm are given in special, and the performance simulations are done for special interference modes. Results show that relative to interference rejection technology based on DFT the algorithm can reduce the loss of useful signal. By reducing implementation complexity the algorithm could be used in practical system. It is meaningful for short wave communication system and satellite communication system with DSSS technology.