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Method for eliminating cell-edge user interference of multi-cell system under C-RAN architecture

An edge user and multi-cell technology, applied in diversity/multi-antenna systems, transmission systems, radio transmission systems, etc., can solve problems such as the difficulty of applying massive MIMO technology

Active Publication Date: 2015-09-30
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

In the FDD system, massive MIMO technology is difficult to apply to the system due to the need for a large amount of downlink pilot sequence training overhead and channel information feedback overhead.

Method used

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  • Method for eliminating cell-edge user interference of multi-cell system under C-RAN architecture
  • Method for eliminating cell-edge user interference of multi-cell system under C-RAN architecture
  • Method for eliminating cell-edge user interference of multi-cell system under C-RAN architecture

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Embodiment Construction

[0040] Below in conjunction with accompanying drawing, the present invention will be further described:

[0041]figure 1 Under the C-RAN architecture, the interference model of the edge user of the multi-cell system is as follows: figure 1 As shown, the base station of each cell is connected to the baseband pool through the optical transmission network, and the baseband pool centrally processes the information sent from each base station, thus realizing the sharing of channel edge information. Assume that there is only one user group at each cell edge, and the channel covariance matrix of each user in the group is the same, so that each user will not only be interfered by users in the group, but also be interfered by users in different cell groups.

[0042] In order to facilitate the analysis of inter-group interference, the internal situation of the cell is ignored, and the system model is transformed into figure 2 The two-way interfering channel model is shown. Assuming t...

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Abstract

The invention relates to a wireless communication system and provides a method for eliminating cell-edge user interference of a multi-cell system under C-RAN architecture. Currently, under the cloud wireless access network (C-RAN) architecture, a remote base station can share channel edge information in a baseband pool. Aiming at the problems in applying massive MIMO to an FDD system and in applying the joint spatial division and multiplexing (JSDM) technology to multiple cells, the invention provides a JSDM scheme applied to multiple cells under the cloud wireless access network architecture and a design of a first-order pre-coding matrix with relatively low complexity, thereby reducing the expenses for downlink pilot frequency sequence training and eliminating inter-cell interference and also inter-user interference by a zero-forcing (ZF) method. Theoretical analysis and simulation results indicate that the scheme of the invention contributes to decrease of the complexity of the first-order pre-coding matrix and increase of the overall speed of the multi-cell system.

Description

technical field [0001] The present invention relates to a multi-cell interference elimination technology in the field of wireless communication, in particular to a method for eliminating interference of edge users of a multi-cell system under a C-RAN architecture. Background technique [0002] Cloud Access Network Architecture (C-RAN) integrates centralized processing, collaborative radio and real-time cloud infrastructure, which can effectively reduce system energy consumption, save operating costs and increase network capacity [Chih-Lin I, Jinri Huang, Ran Duan, et al.Recent Progress on C-RAN Centralization and Cloudification[J].IEEE Access,2014,2(2):1030-1039.]. In the C-RAN architecture, remote base stations can share channel edge information in the baseband pool, which enables joint processing between cells. The development of massive MIMO technology has further improved the capacity of wireless communication systems. It utilizes the deployment of a large number of ant...

Claims

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Application Information

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IPC IPC(8): H04B7/04H04B7/06
CPCH04B7/0452H04B7/0456H04B7/0634
Inventor 谢显中葛振涛雷维嘉
Owner CHONGQING UNIV OF POSTS & TELECOMM
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