适合于低空宽带无线信道的改进的SC-FDE系统

摘要

研究了适合于低空宽带无线信道的改进的单载波频域均衡系统的误码率性能,分析了无视距、航行、近场场景下的信道特性并建立了相应的信道模型.为了克服多径效应和多普勒频移带来的误码率“地板效应”,在传统SC-FDE系统基础上,引入Turbo编码,提出了信道估计及频偏估计联合算法.仿真结果表明,改进的SC-FDE系统可以很好地适应低空信道的时变特性,增加编码后可以在低信噪比时达到较低的误码率,从而提高了信息传输的可靠性.%The improved Single Carrier Frequency Domain Equalization(SC-FDE) system and its Bit Error Rate(BER)performance in low-altitude wideband communication channel are studied. The characters of None Line of Sight (NLOS) , navigation, approach scenarios are analyzed and the corresponding channel models are built. In order to solve the ground effect of the BER caused by multi-path effect and Doppler frequency shift, Turbo code is introduced based on the traditional SC-FDE system , and an algorithm joint channel estimation and frequency offset estimation are proposed. The simulation results show that the proposed improved SC-FDE system has a strong ability to adapt to the rapidly time-varying channel and can achieve low BER at low and SNR performance, therefore enhances the reliability of the information transmission.