Performance Comparison of PS Star-16QAM and PS Square-Shaped 16QAM (Square-16QAM)

摘要

Probabilistic shaping (PS) is a promising technology to provide higher data rate, increased spectral efficiency (SE), and longer transmission distance without increasing the complexity of the communication system. We propose a new scheme to apply PS to Star-16QAM and compare to Uniform-Star-16QAM and PS-Square-16QAM schemes. The BER improvement introduced by PS technology in PS-Star-16QAM schemes is greater than that of the PS-Square-16QAM schemes.We investigate and compare the performance of star-shaped 16-ary quadrature amplitude modulation (Star-16QAM) and square-shaped 16QAM (Square-16QAM) in the probabilistic shaping (PS) and uniform schemes with coherent detection. With the help of PS technology, the bit error ratio (BER) improvement achieved in the PS-Star-16QAM scheme is greater than that of the PS-Square-16QAM when compared with the uniform schemes in our numerical simulation and experiment. Therefore, the PS-Star-16QAM shows superiority over the PS-Square-16QAM in terms of the BER improvement.