Beam size enlargement apparatus and method for restraining interference of intelligent antenna

A technology of beamforming and smart antennas, applied in diversity/multi-antenna systems, space transmit diversity, electrical components, etc., can solve problems affecting system downlink beamforming performance and spatial characteristics, and achieve optimal downlink beamforming , the effect of suppressing interference

Inactive Publication Date: 2009-05-20
ZTE CORP
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Problems solved by technology

However, in the presence of strong interference, the spatial characteristics of the desired user will be affected, seriously affecting the downlink beamforming performance of the system

Method used

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  • Beam size enlargement apparatus and method for restraining interference of intelligent antenna
  • Beam size enlargement apparatus and method for restraining interference of intelligent antenna
  • Beam size enlargement apparatus and method for restraining interference of intelligent antenna

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Embodiment Construction

[0052] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0053]Considering the strong interference of adjacent users to the desired user, in the present invention, the interference matrix of the interference user to the desired user will be constructed, and in the null space of the interference vector matrix composed of interference signals, the weight vector of the weight vector shaped to the desired user is sought . The downlink beamforming weight vector is located in the null space of the interference signal vector matrix, and the beamforming device can completely suppress (or greatly suppress) each interference signal from the interfering user, thereby extracting the desired signal, and solving the problem caused by interference in the smart antenna. It causes the estimation performance of the uplink DOA (Direction ...

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Abstract

The invention relates to the technical field of communication, and in particular discloses a beam forming method and a device for inhibiting interference in an intelligent antenna. The method comprises the following steps: firstly, according to received uplink signals, carrying out channel estimation on an expected user and an interferential user, and estimating an incoming wave direction of the expected user and an incoming wave direction of the interferential user; secondly, constructing an interference matrix of the expected user; thirdly, calculating a beam forming weight vector of the expected user based on the interference matrix of the expected user and a spatial covariance matrix covariance matrix; and finally, using the beam forming weight vector of the expected user as a formingweight value to weigh each antenna magnitude phase, and forming downlink beams for the expected user. A beam forming device is used for carrying out beam forming treatment according to the beam forming method. The method can inhibit interference, can still accurately determine spatial characteristics of the expected user, and achieve better downlink beam forming.

Description

technical field [0001] The present invention relates to the technical field of beamforming in the technical field of mobile communication, in particular to a beamforming device and method suitable for a smart antenna in a Time Division Synchronous Code Division Multiple Access (TD-SCDMA) communication system. Background technique [0002] Smart antennas actually use the difference in spatial characteristics between different users sharing the same channel to achieve channel multiplication. Users using the same channel, the same time slot and the same codeword can achieve this through spatial filtering as long as the spatial characteristics of the signal are different. Separation of user signals. Amplitude-phase weighting is performed on signals received by multiple antenna arrays to obtain the required antenna beam pointing to achieve spatial separation. The beamforming method is one of the core technologies in smart antennas. The main purpose of the beamforming method is ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06H04B7/08H04B1/707
Inventor 丁婷史凡郭昕冯波
Owner ZTE CORP
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