应用科学学报 ›› 2010, Vol. 28 ›› Issue (4): 331-336.doi: 10.3969/j.issn.0255-8297.2010.04.001

• 通信工程 •    下一篇

32QAM比特软信息简化计算

王磊, 徐大专   

  1. 南京航空航天大学信息科学与技术学院,南京210016
  • 收稿日期:2010-03-30 修回日期:2010-06-06 出版日期:2010-07-23 发布日期:2010-07-23
  • 通信作者: 王磊, 徐大专
  • 作者简介: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
  • 基金资助:

    航空科学基金(No.2009ZC52036)资助

Simplification of Bit Metric Calculation for 32QAM


WANG Lei, XU Da-zhuan   

  1. College of Information Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
  • Received:2010-03-30 Revised:2010-06-06 Online:2010-07-23 Published:2010-07-23
  • Contact: WANG Lei, XU Da-zhuan

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

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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