改进的短波信道数据引导均衡算法研究(英文)  

Improved data-directed equalization algorithm in HF channel

作　　者：周新力[1] 孟庆萍[2] 田伟[3] 

机构地区：[1]海军航空工程学院研究生一队,山东烟台264001 [2]海军航空工程学院电子与信息工程系,山东烟台264001 [3]海军航空工程学院训练部,山东烟台264001

出　　处：《西安邮电学院学报》2012年第4期35-40,共6页Journal of Xi'an Institute of Posts and Telecommunications

摘　　要：针对短波信道数据引导均衡算法(data-directed equalization algorithm,DDEA)存在的问题,即必须以一帧数据内信道恒定为前提假设,且在均衡器和译码器之间只能传递硬判决信息,提出两种改进的DDEA均衡算法,分别从不同角度对此加以解决。所提可变信道系数的DDEA算法无须假设一帧数据内信道系数恒定,而允许在每个采样间隔信道系数都是变化的。所提DDEA-Turbo均衡算法能通过在信道估计器、均衡器和译码器之间传递软判决信息,将均衡器和译码器联合起来进行迭代。仿真结果表明,两种改进算法相较于传统的DDEA算法在性能方面都有不同程度的提高,但有分析显示,这种性能的提高须以增加复杂度为代价。Aiming at solve these problems that the channel coefficients are supposed to be constant during a detection block of data and that hard decision information is passed from equalizer to decoder by data-directed equalizer in HF channel communication, two improved algorithms based on data-directed equalization algorithm （DDEA）are proposed. The channel coefficients at every sampling interval are different in variable channel coefficients based data-directed equalization algorithm （VCC-DDEA） which a- bandons the hypothesis that channel coefficients are constant in a detection block. In Data-directed equalization algorithm based Turbo equalization algorithm （DDEA-DDEA）, soft decision information is delivered between channel estimator, equalizer and decoder. These algorithms solved the problems existing in traditional DDEA from different aspects Simulations show that the performance of these proposed algo-rithms are improved at different degree comparing to the current DDEA. But some researches indicate that the cost of the performance improvement is the complexity.

关 键 词：数据引导均衡 可变信道参数 TURBO均衡 软判决信息 硬判决信息 

分 类 号：TN911.5[电子电信—通信与信息系统]