Linear coverage transmission system adopting MIMO signal bidirectional feed-in leakage cables

Abstract

The invention relates to a transmission system adopting MIMO signal bidirectional feed-in leakage cables. The transmission system comprises a radio frequency unit, at least one bidirectional leakage cable, a first three-port circulator, a matched load, a radio frequency electrical-to-optical converter, optical fibers, a radio frequency optical-to-electrical converter, a time delay compensation module and a second three-port circulator. Two-way signals output from the radio frequency unit are fed in the leakage cables from two ends; the circulators are added at the two ends of the leakage cables to ensure one-way circulation of the two-way signals and the orthogonality of the MIMO signals is ensured through remote optical fibers and the time delay compensation module. The two-way MIMO signals are bidirectionally fed in the leakage cables to expand the leakage cable structure, so that the multi-path signal transmission can be realized. The number of a plurality of traditional leakage cables for transmitting the MIMO signals is reduced by half via the transmission system. The transmission system without changing a transmitter framework is high in compatibility and is used in linear overlay communication scenes, and can improve the communication performance in the linear overlay communication scenes.

Description

technical field [0001] The invention relates to a linear coverage transmission system using MIMO signals bidirectionally fed into leaky cables, belonging to the technical fields of communication and electronics. Background technique [0002] Leaky cables are widely used in linear coverage communication scenarios such as roadways, underground passages, mines, and tunnels due to their good uniform radiation characteristics. MIMO (Multiple Input Multiple Output), the core technology of the physical layer of the new generation communication system, has brought about a significant increase in spectral efficiency and throughput. For the coverage of MIMO wireless communication systems, the distributed antenna system is widely used. The multi-channel signals of the radio frequency unit are connected to the transmitting antenna through the radio frequency cable, and the distance between the antennas is set enough to ensure the independence between different channels. In linear cover...

AI Technical Summary

Problems solved by technology

The laying of multiple leaky cables will inevitably bring a lot of cost investment, and it will also increase the difficulty of the project

[0004] In addition, there are also plans to mention the method of indoor two-way annular leaky cable MIMO coverage, which does not meet the communication coverage requirements in linear scenarios for indoor scenarios where the transmitter and the leaky cable are close to each other.

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