Multi-cell pre-coding method for inhibiting pilot pollution in large-scale distributed antenna system

A pilot pollution, distributed antenna technology, applied in diversity/multi-antenna systems, radio transmission systems, transmission systems, etc., can solve problems such as inability to directly apply large-scale distributed antenna systems and increased computational complexity

Inactive Publication Date: 2016-03-23
TSINGHUA UNIV
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Problems solved by technology

The existing multi-cell downlink precoding schemes either assume that the ideal CSI is known, or are aimed at a centralized multi-antenna system, and cannot be directly applied to a large-scale distributed antenna system, and its computational compl

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  • Multi-cell pre-coding method for inhibiting pilot pollution in large-scale distributed antenna system

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[0033] The multi-cell precoding method for suppressing pilot pollution in the large-scale distributed antenna system proposed by the present invention is described as follows with reference to the drawings and embodiments:

[0034] The multi-cell precoding method for suppressing pilot pollution in the large-scale distributed antenna system proposed by the present invention,

[0035] This method involves a large-scale distributed antenna system composed of L cells. The number of remote access units RAUs in a central cell with a geographical location in the center is M, the number of antennas equipped for each RAU is N, and users in the central cell The number is K, the total number of users in L-1 cells around the central cell is R, and each user is configured with an antenna, where L, M, N, K, and R are all positive integers; for large-scale distributed antenna systems The user numbers in the central cell are numbered, the user numbers in the central cell are 1, 2,...,K, and the us...

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Abstract

The invention relates to a multi-cell pre-coding method for inhibiting pilot pollution in a large-scale distributed antenna system, and belongs to the technical field of wireless communication. The method comprises the following steps: calculating an estimated value of an uplink channel from one user to one RAU in a central cell according to signals received by antennas on the RAU in the central cell; calculating a covariance matrix of errors in the estimated value of the uplink channel on the RAU in the central cell; calculating estimated values of channel vectors from the user to all RAUs of the central cell; calculating estimated values of channel matrixes from all users to all the RAUs of the central cell; calculating transmitting signal vectors of the central cell by conducting multi-cell pre-coding on data vectors of all the users in the central cell; and performing normalization to obtain actual vectors of signals which are finally transmitted by antennas on all the RAUs in the central cell. Through adoption of the method, the impact of pilot pollution on the downlink pre-coding performance can be effectively inhibited, the system throughput can be improved, and the pre-coding calculation complexity can be greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a multi-cell precoding method for suppressing pilot pollution in a large-scale distributed antenna system, in particular to a minimum mean square error multi-cell precoding method based on a conjugate gradient method. Background technique [0002] With the rapid increase in the number of mobile terminals, the development of the Internet of Things, and the increasing types of wireless data services, users' demands for wireless data services continue to pose new challenges to existing mobile communication technologies. As a technology with the potential to meet the spectrum efficiency, energy efficiency and channel capacity requirements of future wireless mobile communications, massive multiple-input multiple-output (hereinafter referred to as MassiveMIMO) technology has attracted widespread attention in academia and industry. [0003] The Massive MIMO technology provi...

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Application Information

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IPC IPC(8): H04B7/04H04L25/02
CPCH04B7/04H04B7/0413H04B7/0456H04L25/0256
Inventor 粟欣曾捷肖驰洋王京许希斌赵明肖立民
Owner TSINGHUA UNIV
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