Multi-band WIFI (wireless fidelity) parallel transmission scheme based on waveguide tube transmission medium

Abstract

The invention discloses a multi-band WIFI (wireless fidelity) parallel transmission scheme based on a waveguide tube transmission medium. According to the scheme, the waveguide tube transmission medium and WIFI access point equipment are utilized. The multi-band WIFI parallel transmission scheme is characterized in that a broadband combiner for injecting multi-channel WIFI access point equipment signals into the waveguide tube transmission medium, WIFI user equipment, channel filters and narrow-band antennas are also utilized, wherein the WIFI access point equipment is filtered via the channel filters and then is connected to the broadband combiner; and the WIFI user equipment receives the radiated signals in the waveguide tube transmission medium through the corresponding channel filters by the narrow-band antennas of the corresponding channels, the signals are radiated into the waveguide tube transmission medium, and the waveguide tube transmission medium transmits multi-channel WIFI signals in parallel. With the adoption of the multi-band WIFI parallel transmission scheme disclosed by the invention, interferences among different channels can be effectively reduced, and the simultaneous transmission of multi-channel frequency-orthogonal WIFI signals in a waveguide cavity can be realized, thus remarkably improving the utilization rate of the transmission medium, improving the transmission performance of a system, and reducing the construction and maintenance costs of the system.

Description

technical field [0001] The invention relates to the technical field of train operation control, in particular to a multi-band WIFI parallel transmission scheme based on a waveguide transmission medium. Background technique [0002] In recent years, rail transit in major cities in my country has developed rapidly, and the train operation control method has also been upgraded from the traditional driver's driving according to the ground signal display to the CBTC system control. The so-called CBTC system refers to the communication-based train operation control system (Communication Based Train Control). The current urban rail transit has entered the stage of networked operation. In this environment, the train control system needs large-capacity two-way communication information between the ground and the train to ensure the safety of the train operation; Communicate with the equipment in the carriage at the trackside; at the same time, passengers in the train also have vario...

AI Technical Summary

Problems solved by technology

For the two transmission methods of free wave and leaky cable, since the transmission signals will overlap in the free space, it will inevitably cause mutual interference between multiple signals, reduce the coverage performance of the cell edge, increase the transmission loss rate, and the system confidentiality performance is not good. Guarantee, the closed characteristic of the waveguide transmission medium determines that the above problems can be solved smoothly

However, the use of waveguide transmission causes other problems: when there are multiple access point signal transmissions in the same waveguide, since the signal attenuation by the waveguide is very small, even if two orthogonal signal transmissions are used, the sidelobe leakage signal will cause two-way transmission. Severe interference between, unable to achieve parallel transmission

The cost of assembling a waveguide for each signal is too high, and the maintenance cost and on-site construction difficulty will increase

[0004] To sum up, if the existing CBTC system uses waveguide as the transmission medium, it can effectively improve the coverage performance, transmission capacity and confidentiality of the system, but it cannot carry multiple application systems at the same time, and the system construction and maintenance costs will increase significantly

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