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Uplink space division multiple access system based on Doppler effect and implementation method

A technology of Doppler effect and space division multiple access, applied in the field of uplink space division multiple access mobile communication system, can solve the problems of increasing equipment complexity and cost, multiple radio frequency links, etc., to solve the problem of user capacity, system Flexible configuration and the effect of solving insufficient frequency resources

Active Publication Date: 2021-10-01
PEKING UNIV
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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

Method used

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  • Uplink space division multiple access system based on Doppler effect and implementation method
  • Uplink space division multiple access system based on Doppler effect and implementation method
  • Uplink space division multiple access system based on Doppler effect and implementation method

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Embodiment Construction

[0033] Below in conjunction with accompanying drawing, through specific embodiment, further illustrate the present invention, but do not limit the scope of the present invention in any way.

[0034] Such as figure 1As shown, the Doppler effect-based uplink space division multiple access system provided by the present invention is a cellular system, including one base station and multiple users. Multiple users are in different directions of the base station and use the same frequency to send data, and the users are in a static or low-speed motion state. In the base station, there are N antennas fixed at equal intervals on the rotating disk. The disk rotates at an angular velocity of ω. The radius of the disk is R. At a certain moment, only one antenna is connected to the receiving link, and the other antennas are Disconnected from receive link.

[0035] In the system, user 1, user 2, ······, user M simultaneously use the center frequency f c To send data to the base station,...

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Abstract

The invention discloses an uplink space division multiple access system based on a Doppler effect and an implementation method. The uplink space division multiple access system comprises a base station and a plurality of users, N antennas are distributed at equal intervals on a rotating disc in the base station, the disc rotates at an angular velocity of [omega], and only one antenna is communicated with a receiving link at a certain moment; the system further comprises a demodulator, a band-pass filter, a frequency modulation module, an electronic switch and an antenna selection unit. According to the method, only the same frequency needs to be allocated to different users, when the users send data to the base station by adopting the same frequency, the Doppler effect is generated at the base station through the rotating antenna, and then the data sent by the different users by adopting the same frequency is separated through the filter, so that uplink space division multiple access mobile communication based on the Doppler effect is realized. The technical scheme of the invention is flexible in configuration and use, can effectively solve the problem of insufficient frequency resources of the mobile communication system, and effectively increases the 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...

Claims

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Application Information

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IPC IPC(8): H04B7/0404H04B7/08H04L5/00H04L25/02H04W72/04
CPCH04B7/0404H04B7/0802H04L5/0023H04L25/0204H04W72/0453
Inventor 马猛冯浩
Owner PEKING UNIV
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