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MIMO (multiple input multiple output) precoding control method based on lattice-basis reduction

A lattice reduction, multiple-input multiple-output technology is applied in the control field of multiple-input multiple-output precoding, which can solve the problems of large quantization error and increase downlink control signals, so as to avoid quantization errors, reduce complexity, The effect of system performance improvement

Inactive Publication Date: 2012-08-22
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0016] The technical problem to be solved by the present invention is to provide a control method for multiple-input multiple-output precoding based on lattice-based reduction, which solves the problem of increasing the downlink control signal and quantizing the traditional precoding scheme based on lattice-based reduction. big error problem

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[0049] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0050] First, the symbols and notations involved in the present invention are described, wherein, (·) H Represents the complex conjugate transpose of the matrix, 1 and 0 represent all 1 matrix and zero matrix respectively, ||·|| F Indicates to take the F norm of the matrix, Indicates the largest integer not greater than a, (·) i Indicates the i-th row of the matrix, e i Represents a unit vector whose i-th element is 1 and all other elements are 0.

[0051] The present invention proposes a lattice reduction precoding scheme based on Zero Forcing (ZF) / Minimum Mean Square Error (Minimum-Mean-Square-Error, MMSE) criterion in a MIMO system. Firstly, the lattice-based reduction operation is performed on the right pseudo-inverse matrix of the channel matrix / extended channel matrix to obtain the transformation matrix T, and further obtain the pre...

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Abstract

The invention relates to an MIMO (multiple input multiple output) precoding control method based on lattice-basis reduction. The MIMO precoding control method comprises the following steps of: carrying out a lattice-basis reduction operation on a channel matrix to obtain a conversion matrix and a precoding matrix through a transmission end, processing an original emitting signal through the conversion matrix, and carrying out a modulo operation on the processed emitting signal; calculating according to the obtained precoding matrix and a result after the modulo to obtain a final emission vector of the transmission end and transmitting the final emission vector to the receiving end; and obtaining the original emitting signal transmitted by the transmission end after a receiving end carries out the modulo operation on the obtained receiving vector and finishes corresponding judgment. The method provided by the invention can be used for solving the problems that a control signal of a down link is increased and quantization error is large in a traditional precoding scheme based on the lattice-basis reduction.

Description

technical field [0001] The present invention relates to the field of communication, in particular to a control method of multiple-input multiple-output precoding based on lattice reduction. Background technique [0002] A Multiple Input Multiple Output (MIMO) system refers to a system in which a transmitting end and a receiving end are simultaneously equipped with multiple antennas, which can bring array gain, diversity gain, and multiplexing gain to the system. Precoding is an adaptive technology in a MIMO system, which can effectively improve system throughput, and it can be used for both single user (SU-MIMO) and multi-user (MU-MIMO). Without loss of generality, we take the following MU-MIMO system as an example to explain the precoding technology. [0003] Assume that the system includes a base station with M transmitting antennas and K users, and each user terminal is equipped with an antenna. It is also assumed that M=K, the transmitter has ideal channel state inform...

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Application Information

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IPC IPC(8): H04B7/06H04B7/04H04L1/00
Inventor 赵慧郑斌曾陟维王文博
Owner BEIJING UNIV OF POSTS & TELECOMM
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