Proposal of Radio-over-Fiber Systems Using Cascaded Radio-to-Optic Direct Conversion Scheme (Special Issue on Personal, Indoor and Mobile Radio Communications)

概要

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This paper newly proposes radio-over-fiber systems using cascaded radio-to-optic direct conversion(ROC)scheme. The ROC system can convert a radio signal into an optical signal with the same signal format. The received carrier-to-noise ratio(CNR)performance of the radio-over-fiber systems using the ROC/heterodyne detection(HD)scheme and the ROC/self-heterodyne detection(SHD)scheme are theoretically analyzed. The optimization of an optical modulation index(OMI)in each radio base station(RBS)is also presented. By using the proposed OMI optimization method, the ROC/HD and the ROC/SHD schemes are shown to provide approximately 16dB and 14dB improvement over the intensity modulation/direct detection scheme when the number of RBS is 20 and the radio-frequency(RF)signal bandwidth is 150MHz, respectively. The ROC/SHD scheme enables a receiver structure to become simple while still achieving high received CNR.
社団法人電子情報通信学会の論文
2000-08-25