Self-adaptive transmission method using channel statistical information in multi-user downlink transmission system

A technology of adaptive transmission and channel statistics, applied in diversity/multi-antenna systems, wireless communication, space transmit diversity, etc., can solve the problems of unrealistic uplink capacity burden, achieve low complexity, high speed and easy implementation Effect

Inactive Publication Date: 2011-05-18
HUAWEI TECH CO LTD
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Problems solved by technology

Due to the inevitable error and feedback delay in the transmission of feedback information, 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 state changes rapidly. when
In addition, 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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  • Self-adaptive transmission method using channel statistical information in multi-user downlink transmission system
  • Self-adaptive transmission method using channel statistical information in multi-user downlink transmission system
  • Self-adaptive transmission method using channel statistical information in multi-user downlink transmission system

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specific Embodiment approach

[0049] user terminal:

[0050] 1) Use the received signal for channel estimation to obtain the noise variance σ on each antenna at the receiving end 2 , Use the formula [3] and formula [4] to calculate the transmission correlation matrix and receive correlation matrix

[0051] 2) Decompose the eigenvalues ​​of the sending correlation matrix and the receiving correlation matrix to obtain U T and

[0052] 3) Using the result of eigenvalue decomposition U T , and formula [7] to calculate the channel eigenmode coupling matrix Ω (k) .

[0053] 4) Will Ω (k) and σ 2 Feedback to the base station, enter step 5).

[0054] Base station:

[0055] 5) Decompose the eigenvalues ​​of each user’s transmission correlation matrix to obtain U T .

[0056] 6) Using the noise variance σ 2 And the channel eigenmode coupling matrix Ω of each user (k) , according to the formula [8] and formula [9] to calculate the power allocation matrix of each user

[0057] 7) Make the send...

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Abstract

A self-adaptive transmission method using channel statistical information in a multi-user downlink transmission system can greatly improve the frequency spectrum utilization rate and the power efficiency. The transmission method is carried out according to the following steps: each user calculates the respective channel statistical information, i.e. channel characteristic mode coupling matrix, transmission correlation matrix and noise variance on each receiving antenna, according to the channel estimation result; and the base station performs power distribution and precoding transmission according to the channel statistical information fed back by each user. The invention provides the self-adaptive transmission scheme for the multi-user downlink transmission system using the channel statistical information, and the method can adjust the transmission parameters according to the channel statistical characteristics of the channel so as to acquire higher sum rate.

Description

technical field [0001] The invention relates to a multi-user downlink transmission system for transmitting high-speed data by using multiple sending / receiving antennas, in particular to an adaptive transmission method for a multi-user downlink transmission system using statistical channel information. Background technique [0002] In recent years, the research of information theory has shown that multiple-input multiple-output (MIMO) 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. Due to the diversity gain, multiplexing gain and multi-user diversity gain, the multi-user MIMO system can obtain good performance and large capacity, and will become one of the key techno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/04H04L1/06H04W28/18
CPCY02D30/70
Inventor 高西奇李潇金石
Owner HUAWEI TECH CO LTD
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