Adaptive multiuser wave beam forming method based on wide nulling

A technology of beamforming and nulling broadening, applied in the field of smart antenna beamforming

Inactive Publication Date: 2009-05-06
ZTE CORP
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  • Abstract
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Problems solved by technology

[0007] However, how to multiplex system resources at the same time and at the same frequency for mu...

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  • Adaptive multiuser wave beam forming method based on wide nulling
  • Adaptive multiuser wave beam forming method based on wide nulling
  • Adaptive multiuser wave beam forming method based on wide nulling

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Embodiment Construction

[0035] The present invention will be described in detail below with reference to the accompanying drawings and embodiments, taking the case of two users pairing and multiplexing the same resource as an example, but the present invention is not limited to the case of two users.

[0036] figure 1The flow chart of the method in this embodiment is shown. Firstly, it is necessary to complete the generation of the weight codebook, which is used in adaptive multi-user beamforming. The generation of the weight codebook is to calculate and store the transmission weights of the two users in all possible situations, including:

[0037] Step 1: Predefine the particle size interval Δφ of the scanning angle, and the value range of Δφ is preferably 3°~6°;

[0038] Step 2: The DOA (Direction of Arrival, angle of arrival) angles of the two users are respectively traversed from -60° to 60° at the interval of Δφ, and each user needs to calculate (120° / Δφ °)+1 types, when two users cooperate to...

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Abstract

The invention relates to an automatic-adaptive multi-user beam shaping method based on zero defection broadening, which comprises the following steps: a plurality of sets of direction of arrival, i.e. a DOA angle combination is selected, and each set of direction of arrival includes DOA angles of N users; the orthogonalization is carried out after the transmission weights of the N users of each set is carried out by using a zero defection broadening arithmetic to obtain the final transmission weight of each user, the final transmission weights are stored as a codebook, and N is the number of the users reusing the same resource, and is not smaller than 2; when the beam is shaped, the base station receives an uplink signal, and the DOA angle corresponding to the position of each user is estimated; the N users satisfying the restrictive condition of group division are put into one user group; for each user group, the closest DOA angle combination is matched from the DOA angle combination which is previously selected according to the DOA angles of the N users in the user group, and the transmitting weights of the N users corresponding to the DOA angle combination in the code book are used. The automatic-adaptive multi-user beam shaping method enables at least two users to utilize the same time frequency and code resources and reuse system resources.

Description

Technical field: [0001] The present invention relates to a smart antenna beamforming technology in a Multiple Input and Multiple Output (MIMO: Multiple Input and Multiple Output) wireless mobile communication system, and more specifically, to an adaptive multi-user beamforming (beamforming) based on beam nulling broadening )method. Background technique: [0002] Because the MIMO system can effectively increase the channel capacity, it has become a technology that has attracted much attention in the research of LTE. [0003] The basic idea of ​​the precoding method for multi-users is: the transmitter at the transmitter knows the channel information of all users, and according to the channel information of all users, the signals between multiple users are separated through the multi-user signal separation algorithm, and the user gap is eliminated. The interference between them can achieve the purpose of transmitting multi-user signals on the same frequency at the same time. ...

Claims

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Application Information

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IPC IPC(8): H04B7/06
Inventor 郭阳支周魏巍
Owner ZTE CORP
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