Title :
Low-Complexity Carrier Phase Recovery for Square M-QAM Based on S-BPS Algorithm
Author :
Xian Zhou ; Chao Lu ; Lau, Alan Pak Tao ; Keping Long
Author_Institution :
Dept. of Electron. & Inf. Eng., Hong Kong Polytech. Univ., Hong Kong, China
Abstract :
Minimum distance blind phase search (BPS) algorithm has good tolerance to laser linewidth but with high computational complexity. In this letter, a novel substitution algorithm, i.e., symmetry BPS (S-BPS) is proposed for arbitrary square M-ary quadrature amplitude modulation (M-QAM) coherent optical systems. Based on the symmetry of square M-QAM, it can reduce the complexity directly by simplifying the phase error detection in the real plane and without multiplication. Taking square 4-QAM, 16-QAM, and 64-QAM as examples, the effectiveness of the proposed S-BPS algorithm is demonstrated by numerical simulations.
Keywords :
communication complexity; error detection; light coherence; numerical analysis; optical communication; optical modulation; quadrature amplitude modulation; 16-QAM; 64-QAM; S-BPS algorithm; computational complexity; laser linewidth; low-complexity carrier phase recovery; minimum distance blind phase search algorithm; numerical simulations; phase error detection; square 4-QAM; square M-QAM; square M-ary quadrature amplitude modulation coherent optical systems; substitution algorithm; symmetry BPS algorithm; Adaptive optics; Bit error rate; Complexity theory; Optical modulation; Optical receivers; Quadrature amplitude modulation; Signal processing algorithms; Carrier phase recovery; coherent optical system; quadrature amplitude modulation (QAM);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2014.2332358
