Linear and nonlinear comprehensive precoding method and device for multi-user multiple-input multiple-output (MIMO) system

A precoding and multi-user technology, applied in the field of communication, can solve problems such as high bit error rate, unbalanced equivalent channel gain, and unresolved known interference, so as to improve the overall performance of the system and reduce the system bit error rate.

Inactive Publication Date: 2012-07-04
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

It mainly solves the problems caused by the unbalanced equivalent channel gain of each data stream transmission sub-channel in the linear precoding method based on the optimization criterion of signal-to-leakage-noise ratio. The problem of high code rate

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  • Linear and nonlinear comprehensive precoding method and device for multi-user multiple-input multiple-output (MIMO) system
  • Linear and nonlinear comprehensive precoding method and device for multi-user multiple-input multiple-output (MIMO) system
  • Linear and nonlinear comprehensive precoding method and device for multi-user multiple-input multiple-output (MIMO) system

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Embodiment Construction

[0033] Embodiments of the present invention are described in detail below in conjunction with accompanying drawings:

[0034] This embodiment is applied to a multi-user MIMO downlink system, and the system includes one base station (transmitter) and K users (receiver). The base station is equipped with N T There are two transmitting antennas, and the number of data streams sent to user i (1≤i≤K) is L i , user i configures N ri The root receiving antenna, the data sent by the base station to user i can be expressed as s i , B represents the feedback matrix of the nonlinear processing unit, P represents the feedforward matrix of the feedforward processing unit, P i Represents the feed-forward matrix of user i, W represents the linear processing unit preprocessing matrix, W i Represents the preprocessing matrix of user i, and the total power of the transmitter is limited to E T . H represents the system channel gain matrix, H i Denotes the channel gain matrix of user i. Q...

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Abstract

The invention discloses a linear and nonlinear comprehensive precoding method and a linear and nonlinear comprehensive precoding device for a multi-user multiple-input multiple-output (MIMO) system. The method comprises the following steps of: acquiring the channel state information of each user by using a transmitter; performing linear precoding processing matrix design according to the novel maximum signal-leakage-noise ratio principle of each user; performing geometric mean resolution on an equivalent channel of each user, and acquiring a corresponding user feed-forward processing matrix; extracting the lower triangular part of an equivalent channel matrix after the transformation of a feed-forward matrix and a linear precoding matrix as a feedback processing matrix for nonlinear precoding; and sequentially performing basic processing such as scrambling, modulation and the like, nonlinear dirty paper coding processing, feed-forward matrix processing and linear precoding matrix processing on a signal, and transmitting the processed signal by using the transmitter. By the method and the device, the comprehensive design of linear precoding and the nonlinear precoding is realized, known interference is eliminated, unknown interference is suppressed, the two shortcomings that the known interference is incompletely eliminated and that the gain of each equivalent channel is unbalanced in the linear precoding based on the maximum signal-leakage-noise ratio principle are overcome, and system performance is improved.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a linear and nonlinear integrated precoding method and device for a multi-user MIMO system. Background technique [0002] Multiple-Input Multiple-Output (MIMO) technology can make full use of spatial multipath transmission, provide diversity gain, multiplexing gain and array gain, etc., greatly improving the reliability and effectiveness of the system, and becoming the future wireless communication a key technology. In recent years, research on MIMO technology has expanded from point-to-point single-user MIMO systems to point-to-multipoint multi-user MIMO systems. In a multi-user MIMO system, since multiple user information is transmitted in the same time-frequency resource block, co-channel interference between users is inevitably introduced while improving spectrum efficiency. Since the multi-user MIMO system is limited by the cost, power consumption, and geographical d...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/06H04L5/00H04L1/00
Inventor 武穆清徐春秀张存义陈润芊郑凤孙严智赵敏郭起霖
Owner BEIJING UNIV OF POSTS & TELECOMM
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