Method for realizing matching of radio over fiber system

Abstract

The embodiment of the invention provides a method for realizing matching of a radio over fiber system. The method comprises the following steps of: dividing a matching network into an upper limit frequency range sub-network, a central frequency range sub-network and a lower limit frequency range sub-network, and respectively matching; selecting two stub lines for matching the network, and optimizing stub line parameters based on a genetic algorithm; measuring a reflection coefficient and a transfer power gain of the matched network, respectively comparing the measured values of the reflection coefficient and the transfer power gain with respective pre-set thresholds, when the measured values of the reflection coefficient and the transfer power gain both are not satisfied with the pre-set conditions, regulating the parameters of the matched network again; when the measured values of the reflection coefficient and the transfer power gain both satisfy the pre-set conditions, determining the parameters of the matched network as the final parameters of the matched network. The embodiment of the invention can realize matching of the radio over fiber system within wide frequency range, and the matching performance and the robustness of the matched network both are stronger.

Description

technical field [0001] The invention relates to the field of communication, in particular to a method for realizing matching of an optical wireless communication system. Background technique [0002] With the rapid development of wireless access and mobile multimedia services, the capacity and demand of users for voice, image and data services and high-speed wireless communication are increasing day by day, and the future communication band will be extended to the millimeter wave band. The optical fiber wireless communication system (RoF) with the optical millimeter wave as the core technology can make full use of the characteristics that its optical fiber transmission section is not limited by bandwidth and combine the flexibility of wireless communication technology, and integrate the technology of optical fiber network into the line network. Based on the base station unit, the access network capacity and mobility are increased. In the RoF system, the complex signal proce...

AI Technical Summary

Problems solved by technology

There are two problems in the existing methods to varying degrees: 1. The matching network uses lumped parameter components for matching, but when the frequency reaches 60GHz, these components no longer have the impedance characteristics at low frequencies, so they cannot meet the optical load requirements. Matching requirements for wireless communication systems; 2. The bandwidth range of the matching network is very narrow, and the high-end and low-end mismatch of the frequency response curve is serious

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