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Method and device for quantizing multiuser MIMO system channel based on limiting feedback

A channel quantization, multi-user technology, applied in the field of wireless transmission, can solve the problem of increasing the demand for codebook storage space, increasing computational complexity, increasing the size of the quantization codebook, etc.

Inactive Publication Date: 2008-11-12
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

The disadvantage is that in order to reduce the quantization error, the size of the quantization codebook must be increased
Increasing the size of the codebook means that the system requires more storage space for the codebook, and the computational complexity increases during the quantization process.

Method used

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  • Method and device for quantizing multiuser MIMO system channel based on limiting feedback
  • Method and device for quantizing multiuser MIMO system channel based on limiting feedback
  • Method and device for quantizing multiuser MIMO system channel based on limiting feedback

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Embodiment Construction

[0053] 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.

[0054] The system includes 1 base station and K users (user 1, user 2, ..., user K). The base station has K transmitting antennas, and each user receiver has 1 receiving antenna. 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. At the receiving end of each user, estimate the respective channel state vector, then quantize the channel state vector according to the pre-designed codebook, and send it back to the base stati...

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Abstract

The invention discloses a channel quantification method for a multi-user MIMO system based on limited feedback and a device thereof, which belongs to the technical field of wireless transmission. The method comprises the following steps: according to a channel state message, from a codebook choosing a codeword which has the smallest angle with the codebook and calculating an quantification error; choosing a codeword vector which has the smallest angle with the quantification error from the codebook; projecting a channel vector to the space formed by the two chosen codeword vectors, calculating and obtaining a compound proportion factor; quantifying the compound proportion factor by a pre-generated quantification step set. A receiver device comprises a channel state message obtaining unit, a channel vector qualification unit, a quantification message feedback unit. A sender device comprises a feedback message reconstruction unit and a pre-coding unit. The method and the device of the invention can reduce the quantification error and improve the capacity performance of the system and has the advantages of small codebook and low complexity with same rate and capacity.

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 channel quantization 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 syste...

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Application Information

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IPC IPC(8): H04L1/06H04B7/04
CPCH04B7/0452H04B7/0456H04B7/063H04B7/0634
Inventor 俞子丰罗汉文郭佳李洪星王超
Owner SHANGHAI JIAO TONG UNIV
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