Implementation of Multi-Level Decision and De-Mapping Based on Nature-Coding Method in QAM Demodulation

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.