基于导频的串行干扰抵消技术在导航接收机中的应用

Pilot_based serial interference cancellation applied to navigation receiver

针对采用扩频体制的无线电导航系统中存在的多径干扰和多址干扰,提出了一种基于导频符号的串行干扰抵消技术,利用导频符号和跟踪环路重构干扰信号,将强于直达信号的多址信号和多径信号从接收信号中逐级抵消.建立了串行干扰抵消的数学模型;给出了实现原理框图;分析了系统的性能.理论分析和仿真结果表明,该技术能有效地消除多径干扰和多址干扰的影响,保证接收机接收到有用的直达信号,提高导航接收机的工作性能.

To decrease the influence of multi-path interference and multi-access interference in a radio navigation system, a scheme of pilot-based serial interference cancellation is proposed. Rebuilding the interference signal from the pilot and tracking loop and subtracting it from the mixed signal step by step, the useful signal can be acquired. Presented are the mathematics model of serial interference cancellation, a proposal to implement the scheme, and analysis of the system performance. The results of theoretical analysis and simulations show that the method can decrease the influence of the multi-path interference and multi-access interference and improve the performance of the system effectively.