32QAM比特软信息简化计算

Simplification of Bit Metric Calculation for 32QAM

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.

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.