In order to reduce the cost and improve the system stability, the structure of millimeter wave ROF system is simplified, and the optical carrier direct QPSK modulation ROF system for the purpose of high-speed data transmission is adopted; Seek a series of problems such as how to obtain pure local oscillator in the uplink transmission of optical direct modulation ROF system, and the impact of optical fiber dispersion on high-speed millimeter wave ROF system, so as to improve the existing millimeter wave ROF system and meet the needs of the future development of wireless communication system.

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