Anti-interval-interference base station downlink pre-coding method for multi-cell MIMO (Multiple-Input Multiple-Output) system
An inter-cell interference, multi-cell technology, applied in transmission systems, digital transmission systems, error prevention/detection using return channels, etc., can solve problems such as difficulty in inter-cell synchronization, large delay, etc. The effect of overcoming delay and reducing the amount of data transmission
Inactive Publication Date: 2013-08-28
CHONGQING UNIV
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[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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[0010] Assume that the system has only I=2 cells, Cell1 and Cell2. Each cell has a hexagonal shape, 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, with N antennas. The users in Cell1 are U11 and U12, both of which are central users. The users in Cell2 are U21 and U22. U21 is an edge user and U22 is a central user. figure 1 Shown. Both the base station and the user have GPS positioning functions. Obviously, the signal transmitted by the base station B1 will cause interval interference to U21, and the interval interference can be suppressed through the precoding of B1. Method implementation steps reference figure 2 ,Specifically:
[0011] In the first step, B1 and B2 use GPS to obtain their own location information, exchange them with each other, and then deliver them to users through broadcast. Users also use GPS to obtain their own location information, and through the base station and their o...
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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 present 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 future fourth-generation mobile communications, cell base stations and users will adopt Multiple Input Multiple Output (MIMO) technology based on multiple antennas. At the same time, because the same spectrum resources are used between adjacent cells, users at the edge of the central cell will be interfered by the signals transmitted by the base stations of the adjacent cells, which is called inter-area interference. The traditional method to overcome inter-area interference is to use the base station downlink precoding method. Specifically, the central cell base station first obtains the channel state information (CSI) of all users in the cell and neighboring cells, and then treats all these users as the local Cell users, perform precoding. In this way, the CSI of...
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IPC IPC(8): H04L1/06H04L1/16H04L1/00
Inventor 曾浩袁昂飞刘玲黄扬帆
Owner CHONGQING UNIV