Coordinated beamforming method under CoMP in LTE-A system

An LTE-A and beamforming technology, applied in the field of communications, can solve the problem of low user throughput, reduce co-channel interference and improve average throughput

Inactive Publication Date: 2011-05-25
XIDIAN UNIV
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Problems solved by technology

This algorithm has no limitation on the number of users and the number of transmitting and receiving antennas, but its disadvantage is that the user throughput is not high, and it only reduces the energy of the leaked signal

Method used

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  • Coordinated beamforming method under CoMP in LTE-A system
  • Coordinated beamforming method under CoMP in LTE-A system
  • Coordinated beamforming method under CoMP in LTE-A system

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Embodiment Construction

[0035] see figure 1 , the implementation steps of the coordinated beamforming method in the LTE-A system of the present invention are as follows:

[0036] Step 1, determine M base stations BS participating in CoMP m , m=1,..., M and M co-frequency users in the coordinated cell share a codebook C=(c 1 , c 2 ,...,c N ), each base station has N t transmit antennas, each user has N r receiving antennas, the target user i is sent by the base station BS i service; the M co-frequency users in the cooperative cell above mean that the frequency resource allocation has been completed in each cell, and the time-frequency resources in the cell are sufficient, so that each user in the cell can use different frequency bands at the same time, so there is no If there is co-channel interference, it is only necessary to consider the co-channel interference between users in the cooperative centralized cells, M cooperative base stations BS m , m=1,...,M, so there are at most M co-frequency...

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Abstract

The invention discloses a coordinated beamforming method for coordinated multiple point transmission (CoMp) downlink cells in a long term evolution-advanced (LTE-A) system, which mainly solves the problems of low throughput and co-channel interference of edge users among cells. The method comprises the following realization steps that: (1) a base station utilizes pilot frequency to obtain a channel matrix from the base station to users and resolves a related matrix; (2) the base station performs singular value decomposition on the related matrix according to a maximum signal-to-noise ratio criterion to resolve an eigenvector corresponding to a maximum eigenvalue of the related matrix; (3) a codon with the shortest distance from the eigenvector is found in a codebook space; (3) the base station finds a codon in a codebook according to a criterion of minimum user leakage signal; (4) whether the codons are the same is judged, if so, a beamforming vector of the users is found, and otherwise, operation of the next step is performed; and (5) a codon, the sum of the distances from which to the two codons is smallest, is found in the codebook space and taken as the beamforming vector of the users. The method can improve the average throughput of the edge users of the cells when effectively controlling leakage signal energy of the edge users of the cells, which inhibits the co-channel interference among the edge users of neighboring cells.

Description

technical field [0001] The invention belongs to the field of communication technology, and relates to a coordinated beamforming method under the technical condition of Coordinated Multi-point transmission / reception (CoMP) in an advanced long-term evolution (Long Term Evolution-Advanced for short LTE-A) system . Background technique [0002] In the LTE-A system, co-frequency interference between users in a cell can be effectively eliminated by resource allocation algorithms, but in a multi-cell system, co-frequency interference between users at the edge of adjacent cells still exists, and users belonging to different cells operate on the same time-frequency Resource conflicts are prone to occur, which becomes one of the main obstacles for further improvement of cell edge user throughput. [0003] In order to further effectively suppress inter-cell interference, the CoMP technology is introduced into the LTE-A system. Since CoMP technology can share channel and data informat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W16/28H04W72/12H04B7/04
CPCY02D30/70
Inventor 李兵兵刘明骞黄子甲
Owner XIDIAN UNIV
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