Generating method for multi-user beam shaping emission value

A beamforming, multi-user technology applied in the field of communication

Inactive Publication Date: 2009-01-07
ZTE CORP
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AI Technical Summary

Problems solved by technology

[0006] However, the beamforming method in the prior art cannot generate ideal transmission weights for multiple users

Method used

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  • Generating method for multi-user beam shaping emission value
  • Generating method for multi-user beam shaping emission value
  • Generating method for multi-user beam shaping emission value

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Embodiment Construction

[0032] In the multi-user MIMO mode, the direction of the shaped beam can be designed by designing an appropriate weight vector of the transmit antenna (transmit weight for short), to distinguish the signals of multiple users, and to remove the interference between users.

[0033] Therefore, the basic idea of ​​the present invention is to use the DOA (Direction of Arrival, angle of arrival) estimation algorithm to estimate the DOA angle corresponding to the location of each user, and to group the users according to the grouping constraints; The transmission weights of the users in the group; finally, the transmission weights of the users in the group are orthogonalized to obtain the final beamforming transmission weights, so as to realize the purpose of effectively multiplexing the same time, frequency and code resources for the users in the group .

[0034] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[...

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Abstract

The invention relates to a method for generating multi-user beam-forming launch weight, which comprises steps that: a base station estimates the DOA angle of each user by DOA arithmetic according to a received up run signal; the base station distributes users who meet grouping constraints into the same user group. The grouping constraints include: as to two random users Uj and Uk, corresponding Theta and Theta is required to meet: the absolute value of (Theta minuses Theta) is larger than or equal to Sigma that is multiplied by Delta Theta; wherein, Sigma is larger than or equal to 0.5 and smaller than or equal to 2; Delta Theta is a null width value used by broadening null width algorithm; as to user U in the user group, Thetai is used as a main lobe direction and theta1, ... thetai-1, theta i+1, ... theta are used as the null directions; the launch weight of the U is generated by the broadening null width algorithm. In conclusion, without using a code, the method of the invention is used for generating the launch weight for multiple users, and at the same time, time, frequency and code resources effectively multiplexed by the multiple users with relatively small interference can be realized.

Description

technical field [0001] The present invention relates to the field of communications, in particular to a method for generating transmission weights for multi-user beamforming. Background technique [0002] A Multiple Input and Multiple Output (Multiple Input and Multiple Output, MIMO) system has become a technology that attracts much attention in LTE (Long Term Evolution, Long Term Evolution) research because it can effectively improve channel capacity. [0003] The basic idea of ​​the precoding method for multi-user is that the transmitter knows the channel information of all users, and according to the channel information of all users, the multi-user signal separation algorithm is used to separate the multi-user signals to eliminate the interference between users. To achieve the purpose of transmitting multi-user signals on the same frequency at the same time. [0004] For the downlink, the NodeB (base station) needs to know the downlink channel matrix of each user. This t...

Claims

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Application Information

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IPC IPC(8): H04Q7/30H04B7/26
Inventor 郭阳支周魏巍
Owner ZTE CORP
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