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Array antenna multi-beam forming method and device in tdma communication system

An array antenna and communication system technology, applied in the field of communication, can solve the problems of low equipment and calculation complexity, high equipment complexity, and dependence on training sequences, etc., and achieve the effects of wide angle coverage, expanded user capacity, and good flexibility

Active Publication Date: 2021-05-07
西安英诺视通科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the deficiencies of the above prior art, the present invention proposes an array antenna multi-beamforming method and device in a time-division multiple access TDMA communication system to solve the problem that the existing adaptive beamforming technology needs to rely on training sequences, high equipment complexity, and time-varying characteristics It has the advantages of no training sequence overhead, low equipment and computational complexity, good real-time performance of beam tracking for mobile users, and full array processing gain for each beam.

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  • Array antenna multi-beam forming method and device in tdma communication system
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  • Array antenna multi-beam forming method and device in tdma communication system

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Embodiment 1

[0058] Embodiment 1: Applying the present invention to the 3G base station of TDD-SCDMA which is currently being widely used can expand the coverage of its cell by more than 8 times, and provide broadband services for sparsely populated rural areas. The base station antenna adopts 3 pairs of 8-element array antennas, each covering a 120-degree area to achieve space division multiple access; at the same time, each array antenna supports 4 frequency bands with a bandwidth of 1.6MHz, and each frequency band has 8 time slots and a total of 32 beams. Adaptive shaping; 3 array antennas can form 96 beams in total. Since the gain of the adaptive beamforming antenna is about 8 times higher than that of the 120-degree single-beam antenna, its coverage radius will be increased by about 2.8 times, and the area of ​​the coverage area will be increased by about 8 times. Each 8-element antenna only needs 8 RF-IF-baseband signal processing channels. Although 32 adaptive weight iterative beamf...

Embodiment 2

[0059] Embodiment 2: an unmanned aerial vehicle swarm formed by 32 unmanned aerial vehicles builds a centerless TDD-TDMA communication system with 64MHz signal bandwidth, frame length 25ms, and 32 time slots per frame, and the information rate of each user is 2Mbps, can realize time-division duplex two-way communication between 32 users; any one of them can be used as a super user, and perform two-way communication with the remaining 31 users at the same time; this super user can also be a high antenna gain, A remote ground command center station with high transmission power. The antenna of each UAV user adopts 4-element antenna, and each element is located on the vertices of an equilateral tetrahedron, and each time three elements are selected for adaptive beamforming, it can cover the surrounding 360-degree range . Each user can have 1 to 31 adaptive beamforming units, so a beam can be formed in a maximum of 31 time slots (excluding the time slots occupied by itself), and a...

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Abstract

The invention discloses an array antenna multi-beam forming device and method for a time division multiple access (TDMA) communication system; it solves the problems that the existing beam forming technology needs to use a training sequence, has high complexity, and poor time-varying characteristics. The device includes: an array antenna of N array elements, N radio frequency and baseband signal processing channels, and M adaptive beamforming calculation units. The device implements beamforming directed to M mobile users based on received signals, and the transmitting end uses the same set of weight coefficients to perform transmit beamforming. The characteristic of the adaptive beamforming method is that when the N weight coefficients are adaptively updated, one of them is always equal to 1, while the modulus values ​​of the remaining N-1 remain at 1. It not only does not require a training sequence, nor does it need to perform signal processing on the frame header other than synchronization; therefore, it has low complexity, fast convergence speed, good real-time performance of beam tracking for mobile users, and full array processing gain for each beam .

Description

technical field [0001] The invention belongs to the technical field of communication, and more particularly relates to a multi-beam forming method and device for an array antenna in a TDMA communication system based on time division multiple access. Background technique [0002] As one of the key technologies of array signal processing, beamforming has been widely used in communication, radar and sonar. Beamforming is to form the main lobe of the beam for the signal in the direction of interest and attenuate the interference in other directions. In the fields of cellular network mobile communication, ground-air communication, and multi-user cooperative communication, the importance of smart array antenna technology is very significant, among which array antenna beamforming technology is the most important basic technology. Adaptive beamforming can increase the antenna gain and improve the link characteristics. It can quickly track and align the target direction, expand the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/0408H04B7/06
CPCH04B7/0408H04B7/0617
Inventor 张方杭玉婷易克初
Owner 西安英诺视通科技有限公司