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Multi-user MIMO system precoding method and apparatus based on limited feedback

A precoding and multi-user technology, applied in baseband system components, shaping networks in transmitters/receivers, preventing/detecting errors through diversity reception, etc., can solve problems such as the decrease in the degree of freedom of precoding

Inactive Publication Date: 2009-02-18
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

Its shortcoming is that the case of a multi-antenna receiver is degenerated into a single-antenna receiver, and accordingly, the Block Diagonalization (BD) precoding algorithm degenerates into a zero-forcing algorithm, which reduces the degree of freedom of precoding
Therefore, the performance of the system has room for further improvement

Method used

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  • Multi-user MIMO system precoding method and apparatus based on limited feedback
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  • Multi-user MIMO system precoding method and apparatus based on limited feedback

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Embodiment Construction

[0057] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings: this embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following the described embodiment.

[0058] This embodiment is applied to a multi-user MIMO system based on limited feedback, such as figure 1 As shown, the multi-user MIMO system includes 1 base station and K users (user 1, user 2, ..., user K), the base station has M transmit antennas, and each user receiver has N receive antennas. figure 1 Middle, Z i (i=1, 2, ..., K) is the data sent to the i-th user; T i Represents the linear precoding process of sending data for the i-th user; R i Denote as the receiver of the i-th user.

[0059] The channel model used in this embodiment is MIMO Broadcast Chann...

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Abstract

The invention discloses a channel quantization method of a multiuser MIMO system based on a limited feedback and a device thereof belonging to the wireless transmission technology field. The method comprises the following steps: firstly choosing a code word having a minimal included angle with a codebook from the codebook according to the channel state information, and calculating the quantized error; secondly choosing a code word vector having a minimal included angle with the quantized error from the codebook; projecting the channel vector to the space formed by the chosen two code word vectors and calculating to obtain a compound proportion factor; quantizing the compound proportion factor using a pre-generated quantization step set. A receiving terminal device comprises a channel condition information acquisition unit, a channel vector quantization unit and a quantization information feedback unit. The transmission terminal device comprises a feedback information reconstruction unit and a precoding unit. The channel quantization method of the invention can reduce the quantization error, improve the system capacity performance and have advantages of small used codebook and low complexity when the speed and capacity are the same.

Description

technical field [0001] The present invention relates to a method and device in the technical field of wireless transmission, in particular to a limited feedback-based multi-user MIMO system precoding method and device. Background technique [0002] Using multiple antennas on the transmitter and receiver constitutes a multiple-input multiple-output (MIMO) transmission model, which can enhance the reliability of wireless connections and increase the capacity of wireless communication systems. In a wireless environment with serious electromagnetic interference, for a T root transmit antenna and M R In a system with only one receiving antenna, the contribution of the MIMO transmission method to the improvement of the channel capacity is linearly related to the relatively small number of the number of transmitting antennas and the number of receiving antennas. Therefore, MIMO technology has become an excellent candidate for future broadband mobile communication systems. Aiming...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/06H04L25/03
Inventor 俞子丰罗汉文郭佳李洪星王超
Owner SHANGHAI JIAO TONG UNIV
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