Implementation of Multi-Level Decision and De-Mapping Based on Nature-Coding Method in QAM Demodulation
Zichuang Li, Meng Zhang, Zhixiang Jiang, Jianhui Wu · 2008
The optimum levels were used to decide the real levels for the data input with low error rate. And the real levels could be used to get during de-mapping. For the reason above, it is very important to find the optimum levels. The joint of two parts about one-dimension decision decided the decision bounds in two-dimension space, and the points were fixed to standard constellation. The codes used for the implementation may determine the complexity of hardware. So the nature-coding method was used to simplify the implementation of hardware.