Method for judging down space division multiple access mode of TDD system

A technology of time division duplex system and space division multiple access, applied in diversity/multi-antenna system, space transmit diversity, communication between multiple stations, etc., can solve problems such as defects, system performance degradation, etc., to improve spatial information , the effect of increasing system capacity

Inactive Publication Date: 2009-04-22
ZTE CORP
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Problems solved by technology

However, when the multipath environment is complex, the DOA method has obvious defects, and the accuracy is difficult to meet the needs of the actual system, which will seriously reduce the system performance.

Method used

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  • Method for judging down space division multiple access mode of TDD system
  • Method for judging down space division multiple access mode of TDD system
  • Method for judging down space division multiple access mode of TDD system

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Embodiment Construction

[0020] Preferred embodiments of the present invention are described in detail below.

[0021] Such as figure 1 As shown, the present invention provides a method for judging the downlink space division multiple access mode of a time division duplex system. The idea of ​​the technical solution of the present invention is: the spatial channel impulse response matrix of each user is obtained by the NodeB for the channel estimation of the uplink accompanied by DPCH , and then calculate the spatial channel correlation matrix of each user through this matrix, and finally obtain the optimal Beamforming weight by some method, calculate the spatial correlation factor between different users through the weight, and finally calculate according to a certain criterion Optimal Space Division Code Multiplexing User Combination. The method of the present invention includes the following specific steps.

[0022] A1. Perform channel estimation on the uplink accompanying dedicated physical chan...

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Abstract

The invention discloses a method for judging the mode of down space division multiple access of a time division duplex system, which includes the steps: the operation of channel estimation is carried out to a special physical channel for up adjoint to obtain the channel impulse response matrix of each user; the normalized spatial correlation matrix of each user is calculated; the eigenvalue of each spatial channel correlation matrix is analyzed so as to gather out and take the corresponding eigenvector of each eigenvalue of maximum as the forming weight of each user; the spatial correlation measure of every two users is calculated according to the forming weight of each user; and any user and the user with the spatial correlation measure less than a preset value are classified into the same set, and the actuating codes of the users in the same set are multiplexed by the mode of space division multiple access. The method can judge whether the users can adopt the SDMA mode to carry out the operation of data down-load or not according to the space division properties of the users, and the TDD HSDPA system can effectively utilize spatial information to increase the throughput of data transmission of the system and can increase the capacity of the system.

Description

technical field [0001] The present invention relates to a kind of SDMA (Spatial Division Multiple Access, space division multiple access) method of TDD (Time Division Duplexing, time division duplex) communication system, what relate in particular is, a kind of third generation mobile communication field HDSPA (High-Speed Downlink Packet Access, high-speed downlink packet access) system in the outdoor environment to determine whether the user can enter the SDMA mode and based on this method for space division grouping. Background technique [0002] In the TD-SCDMA HSDPA system, due to the existence of array antenna Beamforming (beamforming, also known as beamforming) technology, there is a possibility of space separation for users separated by a certain angle. Compared with non-SDMA systems, common system code resources The utilization rate of the cell is relatively low, and the data transmission rate of the cell is also low. Therefore, how to judge whether the user can use ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/26H04B7/04
Inventor 郑坤芮华杨宁侯志华黄佩肖炼斌
Owner ZTE CORP
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