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Anti-interval-interference base station downlink pre-coding method for multi-cell MIMO (Multiple-Input Multiple-Output) system

A technology of inter-cell interference and multi-cell, which is applied in the direction of transmission system, digital transmission system, error prevention/detection using the return channel, etc., can solve the problems of inter-cell synchronization difficulty and large delay, and achieve the goal of overcoming inter-cell synchronization problems, The effect of overcoming delay and reducing the amount of data transmission

Inactive Publication Date: 2011-11-23
CHONGQING UNIV
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Problems solved by technology

[0003] In order to overcome the problems of excessive delay and difficulty in inter-cell synchronization caused by the traditional base station downlink precoding method that needs to transmit too many user CSIs between cell base stations in the fourth-generation mobile communication, a multi-cell MIMO system of the present invention is adopted. A Base Station Downlink Precoding Method Against Interval Interference

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  • Anti-interval-interference base station downlink pre-coding method for multi-cell MIMO (Multiple-Input Multiple-Output) system
  • Anti-interval-interference base station downlink pre-coding method for multi-cell MIMO (Multiple-Input Multiple-Output) system
  • Anti-interval-interference base station downlink pre-coding method for multi-cell MIMO (Multiple-Input Multiple-Output) system

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Embodiment Construction

[0010] It is assumed that the system has only I=2 cells, respectively Cell1 and Cell2. Each cell is hexagonal, and base stations B1 and B2 are located in the center of the cell and have M antennas. The number of users in each cell is K=2, and there are N antennas. The users in Cell1 are U11 and U12, both of which are central users, and the users in Cell2 are U21 and U22, where U21 is an edge user, and U22 is a central user, such as figure 1 shown. Both base station and user have GPS positioning function. Apparently, the signal transmitted by the base station B1 will cause inter-interval interference to U21, and the inter-interval interference can be suppressed through the precoding of B1. Method Implementation Step Reference figure 2 ,Specifically:

[0011] In the first step, B1 and B2 use GPS to obtain their own location information, exchange it with each other, and then transmit it to users through broadcasting. Users also use GPS to obtain their own location informat...

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Abstract

The invention discloses an anti-interval-interference base station downlink pre-coding method for a multi-cell MIMO (Multiple-Input Multiple-Output) system. The method comprises the following implementation steps of: 1, positioning a cell user by using a GPS (Global Positioning System) and judging whether the cell user is a central user or an edge user; 2, if the cell user is a central user, estimating channel state information (CSI) and feeding the CSI back to a base station; 3, if the cell user is an edge user, estimating CSI relative to a local cell base station and an interference base station, and feeding back the CSI to the local cell base station; 4, transmitting the CSI of the edge user between the base stations; and 5, computing a pre-coding matrix of the user with a zero-forcingpre-coding method on the base station with cell interference. According to the method, the data exchange amount between the base stations can be reduced, the accuracy of the CSI can be ensured, and realization of cell synchronization is facilitated; and the method can be applied to a fourth generation mobile communication system.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a base station downlink precoding method in a multi-cell MIMO system. Background technique [0002] In the fourth-generation mobile communication in the future, cell base stations and users will adopt multiple-input multiple-output (Multiple Input Multiple Output, MIMO) technology based on multiple antennas. At the same time, since adjacent cells use the same spectrum resources, users located at the edge of the central cell will be interfered by signals transmitted by base stations in adjacent cells, which is called inter-cell interference. The traditional way to overcome inter-interval interference is to use the downlink precoding method of the base station. Specifically, the base station of the central cell first obtains the channel state information (Channel State Information, CSI) of all users in the local cell and adjacent cells, and then regards all these users as loca...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/06H04L1/16H04L1/00
Inventor 曾浩袁昂飞刘玲黄扬帆
Owner CHONGQING UNIV
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