PROPOSAL OF CHIRP MULTIPLEXING TRANSFORM INTENSITY MODULATION DIRECT-DETECTION SYSTEM FOR RADIO HIGHWAY NETWORKS

This paper newly proposes the CMT/IM/DD system for universal radio acc ess networks where radio base stations (RBSs) and an optic backbone ne twork are universally available among different radio services and pro viders. In the proposed system, the Chirp Fourier transformer at an RE S, converts the received FDM multiple radio service signals into optic al TDM format signals, then transfers them over the optic fiber-link. This paper is focused on the discussion about the performance on the u p-link of the CMT/IM/DD system. A new type of the configuration of CMT and the direct demodulation for the CMT signal are also proposed, and the SNR considering inter-symbol and inter-channel interferences caus ed by the CMT is theoretically analyzed. Analysis results show that th e overall SNR performance of the CMT system is superior to the convent ional SCM system when the number of radio channels is more than 26.