Multicast transmit beamforming method and system based on angle information

A shaping and angle technology, applied in diversity/multi-antenna systems, space transmit diversity and other directions, can solve the problem that the base station cannot obtain the target user channel information in time, avoid complete channel information transmission mechanism, reduce interference, and make small changes. Effect

Inactive Publication Date: 2011-04-27
BEIJING JIAOTONG UNIV
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Problems solved by technology

Since the target users in the user group are randomly distributed in the cell, and in this type of service, the base station cannot obtain the channel information of the target users in time, so it is necessary to design a new beamforming suitable for the TD-SCDMA trunking communication system method

Method used

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  • Multicast transmit beamforming method and system based on angle information
  • Multicast transmit beamforming method and system based on angle information
  • Multicast transmit beamforming method and system based on angle information

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Embodiment

[0029] The invention can be applied to the group transmission service of a single base station and a single group in the TD-SCDMA trunking communication system, and can also be applied in other multicast transmission services of a single base station and a single group. The application effect of the present invention is better when the radio wave propagation environment has a direct line of sight (LOS, Line of Sight). A scenario where the present invention is applicable is taken as an example below to describe in detail. like figure 1 As shown, the main lobe of the beam formed in various directions is demonstrated.

[0030] In a cell of a TD-SCDMA trunking communication system equipped with smart antennas, the users of a group are distributed concentratedly in four main directions, and the base station uses angle-based multicast transmit beamforming to form Shape the main lobe, so that the energy is concentrated in the angle range where the user is located, and the receiving...

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Abstract

The invention belongs to the technical field of mobile communication, in particular to a multicast transmit beamforming method and system based on angle information. In the invention, the angle information of target mobile stations is utilized to replace the complete channel information used in the traditional beamforming algorithm, thus the method and system are more suitable for a trunking communication system unable to obtain the channel information timely; and the beamforming gain is also utilized to replace the signal to noise ratio (SNR) used in the traditional beamforming algorithm to serve as the new beamforming optimization target, so the specific channel information can not be involved. The flow related to the invention comprises the following three steps: firstly, obtaining the angle information of the mobile stations by a base station; secondly, generating a beamforming vector based on that the beamforming gain serves as the optimization target; and finally, combining the beamforming vector with the signal to finish transmitting. According the invention, the received SNRs of the target users in the group sending services in trunking communication can be obviously improved; and the method and system provided by the invention are very applicable to the trunking communication system.

Description

technical field [0001] The invention belongs to the technical field of mobile communication, and specifically relates to a method and a system for improving the signal quality received by a target user in group calls, group calls and other group sending services in TD-SCDMA (Time Division Synchronous Code Division Multiple Access) trunking communication by using a smart antenna. Background technique [0002] With the development of space-time signal processing technology, smart antenna technology has been widely used in the field of mobile communication. It mainly uses the antenna array with high correlation to process the transmitted or received signal, and obtains the antenna array gain to improve the system performance. performance, this method is also known as beamforming. Transmit beamforming means that the transmitting end generates an optimal transmission weight based on known channel information, and preprocesses the transmitted signal so that the transmitted signal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06
Inventor 孔勇王正浩谈振辉门家强朱刚
Owner BEIJING JIAOTONG UNIV
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