快速生成QAM比特置信度软判决度量的算法

赵晋; 张建秋

doi:10.3724/SP.J.1146.2007.01907

快速生成QAM比特置信度软判决度量的算法

doi: 10.3724/SP.J.1146.2007.01907

赵晋,
张建秋

基金项目:

上海市科委创新行动计划(077062001)资助课题

计量
- 文章访问数: 3553
- HTML全文浏览量: 99
- PDF下载量: 1797
- 被引次数: 0
出版历程
- 收稿日期: 2007-12-13
- 修回日期: 2008-09-23
- 刊出日期: 2009-04-19

Bit Confidence-Based Soft Decision Metric Generation for QAM

摘要

摘要: 在现代通信系统中，为了保证高的信道解码增益，信道解码器均采用软输入技术。传统的软判决度量大多是基于最小欧氏距离准则生成，该文提出一种基于比特置信度快速生成QAM软判决度量的算法，通过将比特置信度引入到QAM软判决度量的计算中来减少计算的复杂性。相比基于最小欧氏距离的软判决度量生成算法，该文提出的方法在保证信道解码器性能的前提下，减少了生成软判决度量的运算量。应用于中国数字电视地面传输标准DTMB系统的仿真结果表明，该文提出的软判决度量生成算法虽然降低了计算量，但性能几乎没有任何损失，具有良好的性能和可实现性。
- 数字电视;软判决;比特置信度;对数似然比;正交幅度调制;低密度校验码
Abstract: In modern communication systems, a channel decoder usually employs the soft input to guarantee a high channel decoding gain. A new soft decision metric for QAM is presented in this paper. Unlike traditional soft decision metric based on minimum Euclidean distance, the proposed metric is based on the bit confidences. Compared to traditional soft decision metric, the one presented in this paper can guarantee the channel decoder performance with less computation complexity. The numerical results applying the proposed method to the DTMB system indicate that the proposed soft decision metric reduces the computation complexity without any performance degradation. These results also show that the proposed metric is a good alternative for soft decision generations.

HTML全文

参考文献(1)

Gross W J, Kschischanq F R, and Gulak P G. Architectureand implementation of an interpolation processor forsoft-decision reed-solomon decoding[J]. IEEE Trans. on VLSISystems, 2007, 15(3): 309-318.[2]Xia H and Cruz J. Reliability-based forward recursivealgorithms for algebraic soft-decision decoding of reedsolomoncodes[J].IEEE Trans. on Communications.2007,55(7):1273-1278[3]Jean W G, Chang K H, and Gho Y S. An equalizationtechnique for orthogonal frequency division multiplexingsystems in time variant multi-path channels[J].IEEE Trans.on Communications.1999, 47(1):27-32[4]Rahnema M, Antia Y, and Hughers. Optimum soft decisiondecoding with channel state information in the presence offading[J]. IEEE Communications Magazine, 1997, 35(7):110-111.[5]王勇, 艾渤, 葛建华. 数字电视地面广播COFDM传输中的软判决技术[J]. 通信学报, 2003, 24(9): 73-79.Wang Yong, Ai Bo, and Ge Jian-hua. Soft decision techniquein digital video broadcasting COFDM transmission system[J].Journal of China Institute of Communications, 2003, 24(9):73-79.[6]GB20600-2006,《地面数字电视广播传输系统帧结构、信道编码和调制技术规范》, Digital Terrestrial MultimediaBroadcasting, 2006 年第8 号(总第95 号)中国国家标准发布公告.[7]Wang Michael Mao, Xiao Wei-min, and Tyler Brown. Softdecision metric generation for QAM with channel estimationerror[J].IEEE Trans. on Communications.2002, 50(7):1058-1061[8]Hu Xiao-Yu, Elefttheriou E, and Arnold D M. Efficientimplementations of the sum-product algorithm for decodingLDPC codes[C]. IEEE Global TelecommunicationsConference, 2001, 2: 1036-1036E.

施引文献

资源附件(0)

访问统计