移动通信中用于高阶调制LDPC码译码器的一种低复杂度盲信噪比估计器  

A low complexity blind SNR estimator in decoder of high-order modulated LDPC code in mobile communication

作　　者：李晋[1] 徐晓健[2] 尤肖虎[1] 

机构地区：[1]东南大学移动通信国家重点实验室,江苏南京210096 [2]解放军信息工程大学通信工程系,河南郑州450002

出　　处：《电路与系统学报》2006年第3期135-138,共4页Journal of Circuits and Systems

基　　金：国家自然基金重大项目(60496311)

摘　　要：在LDPC(Low Density Parity Check,低密度校验)码软迭代译码器中,需要信道信噪比以生成接收比特先验信息。同时,为了提高频谱利用率,传输符号通常采用高阶调制。本文研究的即是如何从高阶调制符号中估计出信噪比以用于LDPC译码器。本文在只适用于BPSK调制的在线信噪比估计器的基础上,推导得到一种适用于8PSK调制的低复杂度盲信噪比估计算法—8PSKM-BSNRE,这种算法的思路还可被扩展应用于其他高阶调制符号。计算机仿真结果证明,8PSKM-BSNRE在应用于LDPC码译码器时具有较好的性能。SNR （Signal-to-Noise Ratio） should be estimated in the decoder of LDPC （Low Density Parity Check） code to generate a prior information of the received symbols. In addition, the symbols are often high-order modulated for high spectrum efficiency. In this paper, we study how to estimate SNR from the received symbols that had been high-order modulated, and present a low complexity blind SNR estimator for 8PSK modulated signals, named 8PSKM-BSNRE algorithm. The idea of this algorithm also can be extended for other high-order modulation. Simulation results prove that 8PSKM-BSNRE has good performance when be used in the decoder of LDPC code.

关 键 词：移动通信 低密度校验码 信噪比估计器 高阶调制 

分 类 号：TN911.22[电子电信—通信与信息系统]