An Uplink Space Division Multiple Access System and Implementation Method Based on Doppler Effect

Abstract

The present invention discloses an uplink space division multiple access system based on the Doppler effect and its implementation method, which includes a base station and multiple users; the base station is fixed on a rotating disc to distribute N antennas at equal intervals, and the disc is divided into ω Angular velocity rotation, only one antenna is connected to the receiving link at a certain moment; the system also includes a demodulator, a band-pass filter, a frequency modulation module, an electronic switch and an antenna selection unit; it only needs to allocate the same frequency for different users, when the user sends When the base station uses the same frequency to send data, the Doppler effect is generated by the rotating antenna at the base station, and then the data sent by different users using the same frequency is separated by a filter, so as to realize the uplink space division multiple access mobile communication based on the Doppler effect . The technical scheme of the invention is flexible in configuration and use, can effectively solve the problem of insufficient frequency resources in a mobile communication system, and effectively increase user capacity.

Description

technical field [0001] The invention belongs to the technical field of mobile communication, and in particular relates to a Doppler effect-based uplink space division multiple access mobile communication system and an implementation method. Background technique [0002] The Doppler effect is the change in the wavelength of an object's radiation due to the relative motion of the wave source and the observer. In front of the moving wave source, the wavelength becomes shorter and the frequency becomes higher (blue shift); when behind the moving wave source, the opposite effect will occur. The wavelength becomes longer and the frequency becomes lower (red shift); the higher the velocity of the wave source, the greater the effect. [0003] In mobile communication, when the mobile station moves towards the base station, the frequency becomes higher; when it moves away from the base station, the frequency becomes lower. Usually, because the Doppler effect will damage the performa...

AI Technical Summary

Problems solved by technology

In addition, space division multiple access (SDMA) takes advantage of the channel differences caused by users distributed in different locations in space, and uses antennas with spatial resolution capabilities, such as directional antennas or antenna arrays. Typical technologies include multiple User MIMO (MU-MIMO) technology, etc. This method further improves the efficiency of spectrum utilization, but at the cost of requiring multiple radio frequency links, which increases the complexity and cost of the equipment

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