Title :
Analysis of RoF-echo effect on OFDM signal transmission with EPWM format
Author :
Xiaoxue Yu ; Matsuura, Motoharu ; Yamao, Yasushi
Author_Institution :
Adv. Wireless Commun. Res. Center, Univ. of Electro-Commun., Chofu, Japan
Abstract :
Radio over Fiber (RoF) technology integrates wireless access into optical networks. It contributes much for spreading broadband wireless access services to in-building areas and outdoor dead-spots. However, OFDM signals which are widely employed in current broadband wireless access systems suffer from nonlinearity and echoes in RoF channels. The echoes are caused by multiple reflections of light and have long delay compared to the OFDM symbol duration. In this paper, a RoF-echo channel model is proposed and employed in the analysis of the echo effect on the RoF transmission. The validity of the model is confirmed by experimental results. The combined effects of nonlinear distortion and echoes in the RoF channel on normal OFDM and EPWM (Envelop Pulse-Width Modulation) formatted OFDM signals are analyzed and evaluated by measuring their EVM (Error Vector Magnitude) performances.
Keywords :
OFDM modulation; broadband networks; optical fibre subscriber loops; optical transmitters; pulse width modulation; radio access networks; radio transmitters; radio-over-fibre; radiotelemetry; wireless channels; EPWM format; EVM; OFDM signal transmission; OFDM symbol duration; RoF channel; RoF-echo analysis effect; broadband wireless access service system; envelop pulsewidth modulation; error vector magnitude; nonlinear distortion; optical network; radio over fiber technology; wireless access network; Generators; OFDM; EPWM; Echo; OFDM; RoF; nonlinear distortion;
Conference_Titel :
Wireless Personal Multimedia Communications (WPMC), 2013 16th International Symposium on
Conference_Location :
Atlantic City, NJ
