一种联合信道信息的高阶调制软判决方法

摘要

In view of the soft-demapping problem in OFDM systems, the soft-demapping method in combination of united channel information is proposed, and the corresponding implementation framework is designed. Compared with the traditional soft-demapper, the proposed united-channel information soft-demapper has the following two advantages: i) requiring no equalization process, thus the new soft-demapper could be realized in a simpler way for the saving of dividend resources; ii) the new soft-demapper could improve the receiver sensitivity for the channel state information remains in the output of log-likelihood ratio.%针对OFDM系统中的软判决问题,提出了一种联合信道信息的软判决方法,并设计了相应的实现框架.与传统软判决方法相比,所提联合信道信息软判决方法主要有以下两方面优势:一是实现过程中不再单独进行信道均衡,实现上更加简单,节约了除法器资源;二是由于不受均衡过程的影响,特别是在低信噪比或者深衰落信道条件下,不会放大噪声的影响,从而提高了接收机的灵敏度.