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Physical layer multicast and multi-stream data transmitting method based on Givens rotation

A transmission method and physical layer technology, applied in the field of multiple-input multiple-output (MIMO) broadband wireless and mobile communications, can solve the problems of inability to obtain a precoding matrix, no available multicast multi-stream transmission method, etc., to improve transmission quality, Improved SNR fairness, simplified implementation effect

Active Publication Date: 2013-10-23
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

Therefore, when the number of data streams to be transmitted is large, even if the base station is configured with more than two transmit antennas, there is currently no multicast and multi-stream transmission method available, and an effective precoding matrix cannot be obtained

Method used

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  • Physical layer multicast and multi-stream data transmitting method based on Givens rotation
  • Physical layer multicast and multi-stream data transmitting method based on Givens rotation
  • Physical layer multicast and multi-stream data transmitting method based on Givens rotation

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Embodiment 1

[0020] In this embodiment, the base station is configured with 4 transmitting antennas, the multicast group contains 2 users, and each user is configured with 4 receiving antennas as an example, to specifically illustrate the use of the physical layer multicast and multi-stream based on Givens rotation of the present invention The operation process of the data transfer method and its performance.

[0021] In this embodiment, it is assumed that the base station is configured with the number of transmitting antennas M=4, the transmitted symbols come from the quadrature phase shift keying (QPSK) modulation constellation diagram, and the total transmitted power P 0 =1, the number of users in the multicast user group is K=2, and the number of receiving antennas configured for each user is N=4. The noise variance of each user channel is 1. The known channel matrix of each user at the base station is as follows:

[0022] H 1 = ...

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Abstract

The invention discloses a physical layer multicast and multi-stream data transmitting method based on Givens rotation. The method is characterized in that on the basis of the basis thought that a unitary matrix can be obtained by constructing a plurality of Givens matrixes, a multi-input and multi-output physical layer multicast and double-current transmission matrix constructing method is utilized to construct a unitary matrix pre-coding matrix suitable for multi-stream transmission in an iteration method, and therefore multi-input and multi-output physical layer multicast and multi-path data stream transmission with a largest data stream capable of reaching the number of transmitting antennas is achieved. Compared with an existing pre-coding technology supporting multi-stream and multicast, the method can remarkably improve multicast link transmission quality, effectively improves signal-to-noise ratio fairness of adjacent data streams, and is applicable to a novel generation of broadband wireless and mobile communication systems such as 802.11 n, TD-HSPA+, TD-LTE and TD-LTE-Advanced.

Description

technical field [0001] The invention belongs to the technical field of multiple-input multiple-output (MIMO) broadband wireless and mobile communication, and specifically relates to a new generation of broadband wireless and mobile communication such as 802.11n, TD-HSPA+, TD-LTE and TD-LTE-Advanced that adopt MIMO multi-antenna configuration A physical layer multicast and multi-stream precoding method in the system. Background technique [0002] In broadband wireless and mobile communication environments using multiple-input multiple-output (MIMO) technology, linear precoding is a technical method that can improve system throughput and improve transmission robustness. Existing studies have shown that the linear precoding technology can be applied to MIMO single-user scenarios and MIMO multi-user scenarios, including MIMO broadcast channels, MIMO multicast channels, and MIMO multiple access channels. The MIMO physical layer multicast scenario is a transmission mode in which ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/06H04L1/00
Inventor 许小东杜柏生
Owner UNIV OF SCI & TECH OF CHINA
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