In this letter, we propose a soft-decoding ML MIMO demodulation method that lowers the complexity of the existing ML method. The proposed method finds the nearest point without calculating the Euclidean distance by exploiting the regular structure of bit-to-symbol mapping. It enables significant reduction of the number of distance calculations which is a major complexity burden.
['Jungwon Lee', 'Ji Woong Choi', 'Hui Ling Lou', 'Jongsun Park']
Soft MIMO ML demodulation based on bitwise constellation partitioning