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Block diagonalization precoding method used in MU-MIMO (Multiuser-Multiple Input Multiple Output) system down link

A downlink and precoding technology, which is applied in transmission systems, digital transmission systems, baseband system components, etc., can solve problems such as high computational complexity, algorithms affecting communication system hardware configuration requirements, and BD precoding method limitations. Achieve the effect of reducing algorithm complexity, reducing operation complexity, and reducing complexity

Inactive Publication Date: 2011-04-20
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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Problems solved by technology

[0027] From the above analysis of the complexity of the BD precoding methods in the downlink of the existing MU-MIMO system, we can see that the main disadvantage of these methods is the high computational complexity, and the complexity of the algorithm directly affects the communication system Hardware Configuration Requirements
Due to the existence of such deficiencies, the practical application of the existing BD precoding method has been greatly restricted

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  • Block diagonalization precoding method used in MU-MIMO (Multiuser-Multiple Input Multiple Output) system down link

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[0055] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. When the specific implementation is introduced in detail, the basic knowledge of the embodiment is briefly introduced at the same time. Since this part of the content is based on the prior art, there is no detailed description, but this does not affect the common technology in this field. understanding and implementation of the invention.

[0056] In order to facilitate the description and analysis of the precoding method of the present invention, the MU-MIMO system conditions are set as follows: figure 1 as shown, That is, the number of transmitting antennas (Antenna) is not less than the number of receiving antennas. In TDD mode, define N t is the number of transmitting antennas at the base station, the total number of users (User) is K, and any user k (1≤k≤K) has n k (n k ≥1) receiving antennas and n k Data streams (Data streams) for da...

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Abstract

The invention relates to a BD (Block Diagonalization) precoding method used in an MU-MIMO (Multi-User-Multiple Input Multiple Output) system down link. The method comprises the following steps of: step 1, carrying out channel estimation by all users according to received pilot frequency data so as to obtain the MIMO channel matrix of the respective current base station side to users; step 2, obtaining the MIMO channel state information of all user sides by the base station side through channel reciprocity in a TDD (Time Division Duplex) mode; step 3, calculating the null space orthogonal basis of the interference channel matrix of the users by the base station side; step 4, calculating the precoding matrix of individual user according to calculated null space orthogonal basis of the interference channel matrix; and step 5, orderly traversing all the users, and repeating steps 3 and 4 to obtain the precoding matrix of all the users. The invention has the advantage of effectively reducing algorithm complexity under the condition of ensuring that the system performance has no losses.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a block-diagonalization (Block-diagonalization, BD) precoding technology in the downlink of a multi-user multiple-input multiple-output (referred to as MU-MIMO) system. Background technique [0002] Multiple-Input Multiple-Output (MIMO for short) technology can greatly improve the diversity gain and spectrum utilization of wireless communication systems without increasing spectrum resources and transmit power. At present, the research of MIMO system has been extended from point-to-point single user to multi-point-to-multipoint multi-user MIMO system (MU-MIMO). In a multi-user multiple-input multiple-output (MIMO) system, the base station (referred to as BS) transmits signals to multiple users at the same time. Since multiple users share the same time and frequency resources, multi-user co-channel interference (referred to as CCI) will inevitably be intr...

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Application Information

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IPC IPC(8): H04L1/06H04L1/00H04L25/02
Inventor 杨阳方舒罗旬李少谦
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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