衰落信道下基于线性预测的迭代解调及译码技术:Turbo DPSK

Iterative Differential PSK Demodulation and Channel Decoding Based on Linear Prediction over Rayleigh Flat Fading Channels

本文针对移动通信中常见的衰落信道的特点 ,提出了一种基于信道增益线性估计的TurboDPSK解调、译码技术 .其特点是在进行信道增益的线性估计时无需知道信道的自相关函数 ,可简化接收机的复杂度 .同时在系统中引入Per SurvivorProcess(PSP)和迭代译码技术 ,充分利用每次迭代后的信息进一步提高系统的性能 .计算机仿真表明 ,采用这种基于线性信道估计的TurboDPSK系统有很好的抗衰落性能 .

Based on the properties of Rayleigh flat-fading channel model in mobile radio communication,we research and propose a kind of new turbo DPSK based on linear prediction of channel gain.The receiver has a simple structure due to the fact that linear prediction here does not depend on the autocorrelation function of the fading process.Moreover,we combine linear prediction with Per-survivor processing to improve channel estimation.Simulation result show that new Turbo DPSK system provides good BER performance in fading channel.