Linear coverage transmission system using bidirectional feeding of mimo signals into leaky cables

Abstract

The present invention relates to a transmission system using MIMO signals bidirectionally fed into a leaky cable, comprising a radio frequency unit, at least one bidirectional leaky cable, a first three-port circulator, a matching load, a radio frequency electro-optic converter, an optical fiber, a radio frequency photoelectric converter, a delay compensation module and a second three-port circulator. The dual-channel signals output by the radio frequency unit are respectively fed into the leakage cable from both ends. A circulator is added to both ends of the leaky cable to ensure the unidirectional flow of the bidirectional feed signal, and the orthogonality of the MIMO signal is ensured through the remote fiber and the delay compensation module. Multi-channel signal transmission is realized by expanding with dual-channel MIMO signals bidirectionally fed into the leaky cable structure. The system reduces the number of leaky cable transmissions in traditional multiple leaky cable MIMO signal transmission by half, without changing the transmitter architecture, and has high compatibility. It can be used in linear coverage communication scenarios and improve communication performance in linear coverage communication scenarios.

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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