This paper newly proposes a coherent fiberoptic microcellular radio communication system using RF-to-Optic direct conversion scheme. In this system a radio signal is converted into an optical signal with the same signaling or multiplexing format to be coherently transmitted through a wide-band optical fiber without any baseband demodulation and modulation. The theoretical analysis and computer simulation of transmission performances of radio QPSK and QAM signals clarify that the proposed system improves the optical receiver sensitivity by 4.5[dB]' compared with conventional coherent analog optical links.
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