Title :
Frequency Offset Compensation and Carrier Phase Recovery for Differentially Encoded 16-QAM Vector Signal in a 60-GHz RoF System
Author :
Yi, A.-L. ; Yan, L.-S. ; Liu, Cong ; Zhu, Mingda ; Wang, Jiacheng ; Zhang, Leiqi ; Ye, C.-H. ; Chang, Gee-Kung
Author_Institution :
Center for Inf. Photonics & Commun., Southwest Jiaotong Univ., Chengdu, China
Abstract :
Differentially encoding and frequency offset compensating for a 16-quadrature amplitude modulation (16-QAM) vector signal in 60-GHz millimeter-wave radio-over-fiber (RoF) systems are experimentally investigated. The fourfold phase ambiguity issue in a non-data-aided signal communication transmission system with conventional square 16-QAM constellations is successfully tackled based on the differentially encoding scheme. Experimental results show that frequency offset compensation and carrier phase recovery are simultaneously achieved by utilizing the decision-directed carrier phase recovery algorithm. Up to ~ ±1.3 ×10-3 frequency offset times symbol rate product Δf ·Ts is well compensated at the given bit-error-ratio (BER) value of ~ 10-3.
Keywords :
error statistics; quadrature amplitude modulation; radio-over-fibre; 16-QAM vector signal; RoF system; bit-error-ratio value; carrier phase recovery; frequency 60 GHz; frequency offset compensation; millimeter-wave radio-over-fiber systems; non-data-aided signal communication transmission system; Bit error rate; Frequency modulation; Optical fibers; Optical filters; Optical receivers; Vectors; Frequency offset compensation; carrier phase recovery; differentially-encoded 16-QAM; radio-over-fiber;
Journal_Title :
Photonics Journal, IEEE
DOI :
10.1109/JPHOT.2013.2273735
