Free space optical and millimeter wave / terahertz fusion transmission system and working method

Abstract

The application relates to the technical field of wireless communication, and discloses a free space optical and millimeter wave / terahertz fusion transmission system and a working method. The system comprises a transmitter, a base station and a central office. The millimeter wave / terahertz signal is generated by adopting a full-optical up-conversion architecture at the transmitting end, the received millimeter wave / terahertz electrical signal is converted into an optical domain signal at the base station, the optical domain signal is fused with a free space optical signal, the fused optical signal is received by a single optical coherent receiver at the central office, and the fused optical signal is processed. The system is accurately designed in terms of optical frequency relationship, so that the two types of heterogeneous signals fall within the receiving bandwidth of the single coherent receiver, and single-receiver reception is realized. The system supports two working modes of high capacity and high reliability, adopts adaptive demodulation or a hybrid automatic repeat request mechanism based on maximum ratio combination in severe weather conditions, improves transmission reliability, and has the technical effects of reducing system complexity, improving spectrum utilization efficiency, enhancing communication reliability and supporting flexible deployment.

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