多径信道下基于恒模算法的遥测信号盲均衡

Blind Equalization of Telemetry Signals in Multipath Channels Based on Constant Modulus Algorithm

运载火箭在塔架静态测试时易受多径衰落影响,导致遥测信号产生码间干扰。本文对PCM-FM体制遥测信号的多径信道使用恒模算法(CMA)进行盲均衡研究,针对遥测信道中的码间干扰展开理论分析和Matlab仿真,并搭建盲均衡功能测试平台开展实验验证。结果表明:CMA收敛速度高、误码率低,对多径干扰具有较好的鲁棒性和实用性。

Launch vehicles are vulnerable to multipath fading during the static tests in the tower,which leads to intersymbol interference in the telemetry signals.In this paper,the constant modulus algorithm(CMA)is used to carry out blind equalization research on the pulse code modulation/frequency modulation(PCM/FM)telemetry signals in multipath channels.Theoretical analysis and MATLAB simulation are carried out for the intersymbol interference in the telemetry channels,and a blind equalization function test platform is built to carry out experimental verification.The results show that the CMA has a fast convergence speed and a low bit error rate(BER),and has good robustness and practicability to the multipath interference.