Title :
Generation of 16-QAM-OFDM Signals Using Selected Mapping Method and Its Application in Optical Millimeter-Wave Access System
Author :
Shao, Yufeng ; Chi, Nan ; Fan, Jingyuan ; Fang, Wuliang
Author_Institution :
Dept. of Commun. Sci. & Eng., Fudan Univ., Shanghai, China
Abstract :
A simplified full-duplex 60-GHz optical millimeter-wave access system is proposed and experimentally demonstrated with a 16-QAM-OFDM downlink generated by selected mapping (SLM). The system receiver is realized with optical heterodyne detection and electrical self-mixing down-conversion. In the experiment, 5-Gb/s 16-QAM-OFDM signals are transmitted over 42-km SMF-28 and a 0.4-m wireless channel. The experimental results show that SLM can effectively reduce the peak-to-average power ratio and improve the receiver sensitivity. In addition, the proposed self-mixing down-conversion can simplify the transmitter and receiver configuration, since it eliminates the need for high-frequency microwave source at the central station and local oscillator at the base station.
Keywords :
OFDM modulation; microwave photonics; multiplexing; optical fibre communication; quadrature amplitude modulation; 16-QAM-OFDM signals; SMF-28; base station; bit rate 5 Gbit/s; central station; distance 42 km; electrical self-mixing down-conversion; frequency 60 GHz; full-duplex optical millimeter-wave access system; high-frequency microwave source; local oscillator; optical heterodyne detection; quadrature amplitude modulation; selected mapping method; size 0.4 m; system receiver; wireless channel; Optical fibers; Optical receivers; Optical transmitters; Peak to average power ratio; Optical fiber communication; optical millimeter-wave; selected mapping (SLM); self-mixing;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2012.2202387
