| 32QAM比特软信息简化计算 |
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| 引用本文： | 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 |
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| 作者姓名： | 王磊 徐大专 |
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| 作者单位： | 南京航空航天大学信息科学与技术学院，南京210016 |
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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.
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| 关 键 词： | 软解调 正交幅度调制 比特软信息 最大后验概率 |
| 收稿时间： | 2010-03-30 |
| 修稿时间： | 2010-06-06 |
Simplification of Bit Metric Calculation for 32QAM |
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| WANG Lei,XU Da-zhuan. Simplification of Bit Metric Calculation for 32QAM[J]. Journal of Applied Sciences, 2010, 28(4): 331-336. DOI: 10.3969/j.issn.0255-8297.2010.04.001 |
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| Authors: | WANG Lei XU Da-zhuan |
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| Affiliation: | College of Information Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China |
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| 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. |
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| Keywords: | soft demodulation quadrature amplitude modulation bit metric maximum a posteriori |
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