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Multi-user downlink three-dimensional statistics beam forming adaptive transmission method using channel mean information

A technology of adaptive transmission and mean information, applied in channel estimation, transmission system, radio transmission system, etc., can solve the problems of unrealistic, channel estimation error, channel information uplink capacity burden, etc.

Inactive Publication Date: 2015-08-26
SOUTHEAST UNIV
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Problems solved by technology

Due to the inevitable feedback delay in the transmission of feedback information, and the channel estimation may have errors, it is often unrealistic to assume that the ideal channel information is known at the sending end, especially when the number of users and the number of transmitting antennas are large and the channel When the state changes rapidly
In addition, for FDD systems, the feedback of channel information causes a great burden on the uplink capacity, and this problem becomes more serious in broadband (such as OFDM) systems and systems with high mobility

Method used

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  • Multi-user downlink three-dimensional statistics beam forming adaptive transmission method using channel mean information
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  • Multi-user downlink three-dimensional statistics beam forming adaptive transmission method using channel mean information

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specific Embodiment approach

[0043] 1) If it is a TDD system, skip to step 2); if it is an FDD system, skip to step 4).

[0044] 2) The base station uses the result of uplink channel estimation and channel reciprocity to obtain the downlink normalized channel row vector h of user i i , using the formulas [2] and [3] to calculate the channel mean of user i respectively and Rice factor K i .

[0045] 3) Use the formula [4]-[7] to calculate Λ V,i and Λ H,i , to find out the vertical main mode and the horizontal main mode of the channel mean value of user i respectively, that is, Λ V,i and Λ H,i largest element on the diagonal with corresponding index l i and j i , go to step 7).

[0046] 4) User i uses the result of its channel estimation to calculate the channel mean value of user i respectively according to the formulas [2] and [3] and Rice factor K i .

[0047] 5) User i uses the formula [4]-[7] to calculate its Λ V,i and Λ H,i , to find out the vertical main mode and the horizontal mai...

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Abstract

The invention discloses a multi-user downlink three-dimensional statistics beam forming adaptive transmission method using channel mean information. A uniform planar antenna array is taken as a base station. The transmission method comprises the following steps: for an FDD (Frequency Division Duplex) system, each user calculates respective channel mean information, namely, a Rice factor, a channel mean vertical direction main mode and a horizontal direction main mode, by using a channel estimation result, and feeds the calculated respective channel mean information to the base station; for a TDD (Time Division Duplex) system, the base station calculates the downlink channel mean information of each user by using an uplink channel estimation result; and the base station selects a service user according to the obtained channel mean information, and performs pre-coding transmission on the service user. Through adoption of the multi-user downlink three-dimensional statistics beam forming adaptive transmission method using the channel mean information provided by the invention, the robustness of a system is enhanced effectively, and a large average mutual information amount can be obtained at low calculation complexity.

Description

technical field [0001] The invention relates to a multi-user downlink transmission system for transmitting high-speed data by using a uniform planar antenna array, in particular to an adaptive transmission method for a multi-user downlink transmission system using channel mean value information. Background technique [0002] In recent years, research on information theory has shown that multi-antenna technology can significantly improve the transmission rate of wireless communication systems. At present, the research on the point-to-point single-user system has basically reached a conclusion, while the research on the capacity and optimal transmission scheme of the multi-user system has attracted extensive attention of international scholars. The multi-user multi-antenna system can obtain good performance and large capacity because of its diversity gain, multiplexing gain and multi-user diversity gain, and it will become one of the key technologies of the new generation wire...

Claims

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Application Information

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IPC IPC(8): H04B7/04H04L25/02
CPCH04B7/043H04L25/0202
Inventor 李潇金石高西奇
Owner SOUTHEAST UNIV
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