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Improved multi-user selection method for block diagonally multi-in and multi-out system based on model

A technology of block diagonalization and multi-input multi-output, which is applied to the selection device of multiplexing system, diversity/multi-antenna system, selection device, etc., and can solve the problem of inapplicability

Inactive Publication Date: 2008-03-26
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

But it is only applicable to the special case of the block diagonalization system - zero-forcing beamforming (ZFBF) system, not applicable to the general block diagonalization system when the user receiving antenna is greater than 1

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  • Improved multi-user selection method for block diagonally multi-in and multi-out system based on model
  • Improved multi-user selection method for block diagonally multi-in and multi-out system based on model
  • Improved multi-user selection method for block diagonally multi-in and multi-out system based on model

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Embodiment Construction

[0036] The system in this embodiment adopts a downlink multi-user MIMO system with K users. Base station has n t transmit antennas, for simplicity, assume that all users have the same number of receive antennas n r , the maximum number of users that the system can support simultaneously is in is the largest integer not greater than a. Assuming that the base station can know the channel state information (CSI) of each user, H j is the channel matrix from the base station to user j, each element of which is a complex Gaussian random variable that obeys independent and identical distribution, with a mean of 0 and a variance of 1. Set the threshold for reducing the user set to α.

[0037] Remember Ω i is the set of users to be selected when selecting the i-th user, γ is the set of selected users, γ+{a} is a new set after adding a to the set γ, γ-{a} is the new set after removing the element a in the set γ A new collection of V γ is the orthogonal basis of all selected us...

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Abstract

An improved multi-user selecting method based on block diagonalization multiple-input multiple-output system of norm is provided, firstly selecting a maximum user of the channel Frobenius norm, then adding the maximum user of the equivalent channel Frobenius norm sum acquired by multiplying channels of all selected user with corresponding precoding matrix in a backup user collection in turn, until the maximum number of users can be supported by the system synchronously. The invention reduces the calculation complexity from two sides: adopting an heuristic Gram-Schmidt orthogonalization method to simplify the design flow of the precoding matrix; after selceting a user every time, updating the backup user collection to make users of the collelction and users of the selected user collection satisfy the orthogonality, thereby reducing the searching range selected by users at next time.

Description

technical field [0001] The invention relates to the multiple-input multiple-output (MIMO) technical field of wireless communication, in particular to an improved norm-based multi-user selection method of a block diagonal MIMO system. Background technique [0002] Block diagonalization is a common linear precoding technique to eliminate co-channel interference between users and realize space division multiple access in downlink multi-user MIMO systems. When the number of system users is relatively large, how to effectively select a set of users who can communicate at the same time to improve system performance is one of the main research topics in space division multiple access systems. "International Institute of Electronics and Electrical Engineers Signal Processing" (IEEE Transactions on Signal Processing, Volume 54, Issue.9, Sept.2006, pp.3658-3663) proposed two low-complexity algorithms suitable for block diagonalization systems Multi-user selection method, the proposed...

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Application Information

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IPC IPC(8): H04Q11/00H04B7/04H04L1/06
Inventor 朱有团唐志华刘宇鹏朱近康邱玲
Owner UNIV OF SCI & TECH OF CHINA
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