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应用科学学报 >

2010 , Vol. 28 >Issue 4: 331 - 336

DOI: https://doi.org/10.3969/j.issn.0255-8297.2010.04.001

通信工程

32QAM比特软信息简化计算

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  • 南京航空航天大学信息科学与技术学院，南京210016
王磊，博士生，研究方向：移动通信，E-mail: wanglei_1982@nuaa.edu.cn；徐大专，教授，博导，研究方向：无线通信，E-mail:xudazhuan@nuaa.edu.cn

收稿日期: 2010-03-30

  修回日期: 2010-06-06

  网络出版日期: 2010-07-23

基金资助

航空科学基金(No.2009ZC52036)资助

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Simplification of Bit Metric Calculation for 32QAM

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  • College of Information Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

Received date: 2010-03-30

  Revised date: 2010-06-06

  Online published: 2010-07-23

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摘要

提出一种简化的32QAM比特软信息计算方法. 先将复平面分块并为每个区域选取一条直线，对于落在某个区域中的接收信号，通过计算其到对应直线的距离来求取比特软信息. 然后给出了复平面划分和直线选取的方法和依据，并对严格的软信息计算方法进行简化. 最后，从复杂度与系统性能的角度将简化方法与log-MAP和max-log-MAP这两种方法进行对比，结果表明简化方法可以大大降低计算量，且对系统性能的影响很小.

关键词： 软解调; 正交幅度调制; 比特软信息; 最大后验概率

本文引用格式

王磊， 徐大专 . 32QAM比特软信息简化计算[J]. 应用科学学报, 2010 , 28(4) : 331 -336 . DOI: 10.3969/j.issn.0255-8297.2010.04.001

Abstract

We present a simplified 32QAM bit metric calculation method. By dividing the complex plane and merging similar regions, the bit metric is obtained by calculating the distance between the received symbol and a line assigned to each region. Simulation shows that computational complexity in calculating bit metrics is greatly reduced without degrading the performance as compared to the log-MAP and max-log-MAP methods.

Key words： soft demodulation; quadrature amplitude modulation; bit metric; maximum a posteriori

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