基于纠错码的ADSL信道信噪比估计算法

Channel SNR Estimation Based on Error Correcting Code for ADSL

通过卷积编码的信息来估计信道信噪比 ,以利于ADSL网络的自适应传输 ,由于算法简单实用 ,且可以在传输过程中实时地更新信道信息 ,故非常适合于实际运用 .文中的仿真结果表明 ,该基于循环纠错码的信道信噪比估计算法在实际系统中具有很好的性能 .

In this paper,we propose a channel signal-to-noise ratio estimation algorithm based on error correcting code for ADSL network.In recoding the Viterbi decoder output and comparing the recoding steam with the demodulation output,we get the channel error information.Then after exploiting the maximum a posteriori(MAP)estimation,channel SNRs will be estimated.Our algorithm also employs information from error detecting code.Since the method processes blind character,and can recurrent channel information when transmitting,it is amenable to real applications.Simulation results confirm our theoretical analysis.