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User selection method, user selection device and base station

A technology for selecting devices and users, applied in diversity/multi-antenna systems, space transmit diversity, prevention/detection of errors through diversity reception, etc., can solve problems such as limited number of users

Inactive Publication Date: 2012-09-26
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the system supports a limited number of users at the same time, and a subset of users needs to be selected for service

Method used

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  • User selection method, user selection device and base station
  • User selection method, user selection device and base station
  • User selection method, user selection device and base station

Examples

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Embodiment

[0090] In the following, the user selection method of the present invention will be described in detail in conjunction with detailed implementation examples. In the following description, specific examples of the present invention are provided for the frequency division duplex (FDD) mode and the time division duplex (TDD) mode respectively.

[0091] Frequency division duplex (FDD) method

[0092] This example adopts a multi-user MIMO downlink system with 6 users. The transmit power of the base station is 1W, the number of base station antennas is 4, the number of antennas for each user is 2, and the number of data streams is 1. It can be seen that the maximum number of users supported by the system at the same time is 4. Assuming that the channel is flat fading and quasi-static, the elements of the channel matrix are independent and identically distributed complex Gaussian random variables with zero mean and unit variance, the noise is additive white Gaussian noise with zero ...

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Abstract

The invention discloses a user selection device which comprises a system capacity computing unit and a UE (User Equipment) selection unit. The system capacity computing unit is used for computing the channel capacity of each UE according to a UE channel matrix and data flow number of each UE; and the UE selection unit is used for selecting the UE with the largest channel capacity as selected UEs and updating a selected UE set and an unselected UE set; selecting a UE from the unselected UE set one by one to form UE subsets together with the selected UE set; selecting UEs which can increase system capacity to the maximum as selected UEs and updating the selected UE set and the unselected UE set; reconstructing the UE subsets on the basis of the updated selected UE set and unselected UE set if the number of the selected UEs is less than an allowed maximum UE number; otherwise, outputting the selected UE set and finishing the user selection processing. In addition, the system capacity computing unit also can be used for confirming the system capacity of each subset formed by the UE selection unit by adopting a quadrature space division multiplexing technology. The invention also discloses a user selection method and a BS (Base Station) comprising the user selection device.

Description

technical field [0001] The present invention relates to the field of wireless communication, and more specifically relates to a user selection method, a user selection device and a base station, which can be applied to a multi-user Multiple Input Multiple Output (MIMO) Orthogonal Space Division Multiplexing (OSDM) system. Background technique [0002] Space-division multiplexing is a technique for eliminating co-channel interference between users and realizing space-division multiple access in downlink multi-user MIMO systems. When the number of system users is relatively large, how to effectively select a set of users that can be served at the same time to improve system capacity is one of the main research topics in the space division multiple access system. Block Diagonalization (BD) is a typical space division multiplexing technique for realizing space division multiple access. Low complexity user selection algorithms for multiuser MIMO systems with block diagonalizatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/06H04B7/06H04B7/08
Inventor 吕晶罗汉文丁铭蒋武扬刘市
Owner SHANGHAI JIAO TONG UNIV
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