FFT解调的短波跳频系统自适应实时信道估值  

Adaptive real-time channel estimation based on FFT demodulation in SW frequency-hopping system

作　　者：甘良才[1] 李伟华[1] 俞柏峰[1] 

机构地区：[1]武汉大学电子信息学院,湖北武汉430072

出　　处：《电波科学学报》2001年第2期208-213,共6页Chinese Journal of Radio Science

基　　金：国家自然科学基金资助项目 (6 9772 0 15 )

摘　　要：在分析伪错线性外推算法置信度的基础上 ,结合短波 FH/DQPSK系统 FFT的解调技术 ,提出了一种适用于短波瑞利衰落信道 BER估计的自适应线性外推算法 ,并进行了数值模拟 ,其结果表明 :该算法能够准确地反映信道的实际比特误码特性 ,其绝对误差 Δmax=0 .0 1 8,且该算法监测范围较伪错线性外推算法监测的范围更宽 ,基本上能覆盖该信道的实际比特误码范围 ( 1 0 -1～ 1 0 -4 )。最后提供了该算法可行的硬件实现方案。Based on the analyses of confidence level about the liner's pseudo-error extrapolation algorithm,and combined with FFT demodulation technology in SW FH/DQPSK system, it proposed a method to estimated BER using adaptive linear extrapolation algorithm in Rayleigh Fading channel. By numerical simulation, the result show that using this method to the real-time frequency monitor can reflect the real BER characteristic of Rayleigh Fading channel exactly.and its absolutes error Δ max=0.018 .The range of monitor was wider than liner's pseudo-error extrapolation algorithm. It could overwrite the actual BER range of this channel(10 -1~10 -4). At last a kind of realizable hardware schematic for this algorithm is presented.

关 键 词：解调 短波通信 跳频通信 快速付里叶变换 自适应实时信道估值 

分 类 号：TN914.41[电子电信—通信与信息系统]