改进的Summer算法及其在Turbo译码中的应用  

Improvable Summer Algorithm and Its Application in Turbo Decoding

作　　者：陈雪红[1] 

机构地区：[1]南京邮电大学通信与信息学院,江苏南京210003

出　　处：《现代电子技术》2007年第13期86-89,92,共5页Modern Electronics Technique

摘　　要：由于Summer信噪比算法采用的信道模型为AWGN信道,他对衰落信道并不适用。通过在接收信号中增加了衰落因子,提出了一种能够应用于Nakagami衰落信道的改进Summer信噪比估计算法。仿真表明,运用改进的算法获得的信道信噪比信息非常接近实际的信噪比信息,同时,改进的Summer在线估计器使得Turbo译码性能得到明显的改善,而且不影响Turbo译码过程的总复杂度。The Summer algorithm of the SNR estimation can not be applied to the fading channel because it adopts the model of AWGN channel. The paper puts forward the improvable Summer algorithm of the SNR Estimation in the Nakagami fading channel by using fading gene of the collected signal. We can find out from simulative results that the SNR in the improvable Summer algorithm approaches to the true SNR. This scheme can improve the performance of Turbo decoding more rapidly and does not add to the overall complexity of Turbo decoding.

关 键 词：信噪比估计 NAKAGAMI衰落信道 RAYLEIGH衰落信道 TURBO译码 

分 类 号：TN911.22[电子电信—通信与信息系统]