System and method for optimizing property of radio over fiber down transmission link

Abstract

The invention discloses a system for optimizing the property of a radio over fiber down transmission link, comprising a center station, a down fiber transmission link (3) and a base station, wherein the center station comprises a base band data signal (2) and a light carrying radio-frequency signal generation subsystem (1); the base station comprises a photoelectric detector (4) and an optical filter (5); and the center station carries out data transmission is conducted between the center station and the base station through the down fiber transmission link (3). The invention also discloses a method for optimizing the property of the radio over fiber down transmission link. The invention solves the problem of the property optimization of a system in a frequency modulate data modulating way under certain radio-frequency subcarrier frequency, reduces the power oscillation of the RoF (Radio Over Fiber) base station and the oscillation amplitude of the eye-opening penalty oscillation of a user receiving end, also prolongs the oscillation period and further improves the transmission property of the system and increases the capacity of the system.

Description

technical field [0001] The present invention relates to the technical field of radio-over-fiber (RoF) communication systems, in particular to a system and method for optimizing the performance of radio-over-fiber downlink transmission links. Background technique [0002] The development of high-speed and large-capacity optical fiber communication systems and breakthroughs in all-optical network key technologies have enabled the next-generation mobile communication system to gradually develop into a communication system that integrates wired communication and wireless communication, and interconnects fixed communication and mobile communication. As a new broadband access method, optical fiber radio combines the low loss and high bandwidth of optical fiber communication with the mobile portability of wireless communication, and has become one of the key technologies in the design of the fourth-generation broadband mobile communication system. [0003] In the RoF system, the op...

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Problems solved by technology

[0010] Aiming at the above situation, the present invention provides a system and method for optimizing the performance of optical fiber radio downlink transmission link, and adopts negative level precoding mode to solve the problem of system performance optimization when using FM data modulation mode under a certain radio frequency subcarrier frequency , which reduces the oscillation amplitude of the power oscillation at the RoF base station and the eye opening cost oscillation at the user receiving end, and at the same time prolongs the above oscillation period, further improving the system transmission performance and increasing the system capacity

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