Method for realizing adaptive transmission by comprehensively utilizing long-time and short-time channel state information

A channel state information, adaptive transmission technology, applied in the field of 3GPP LTE standardization process, can solve problems such as inability to directly apply, and achieve the effect of improving spectrum utilization

Inactive Publication Date: 2011-08-10
HUAWEI TECH CO LTD
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Problems solved by technology

Obviously, for high-order MIMO transmission supporting eight transmit antennas, the codebook defined by LTE cannot be directly applied, and a low-complexity precoding design method needs to be proposed

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  • Method for realizing adaptive transmission by comprehensively utilizing long-time and short-time channel state information
  • Method for realizing adaptive transmission by comprehensively utilizing long-time and short-time channel state information
  • Method for realizing adaptive transmission by comprehensively utilizing long-time and short-time channel state information

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specific Embodiment approach

[0060] The adaptive transmission method comprehensively utilizing long-term and short-term channel state information provided by the embodiment of the present invention can adapt to changes in the channel environment in a high-order MIMO system. The system block diagram is as follows figure 1 shown. The specific implementation is as follows:

[0061] user:

[0062] (1) Use the received pilot signal for channel estimation, and calculate the transmit correlation matrix and receive correlation matrix according to formulas (1)-(8)

[0063] (2) Perform eigenvalue decomposition on and respectively to get U t , Λ t , Λ r ;

[0064] (3) According to the result of the eigenvalue decomposition of the correlation matrix in formula (2), calculate the number N of data streams that can be transmitted independently according to formulas (9)-(11) S , if N S ≤3, take N S = 2, otherwise take N S = 4;

[0065] (4) Using the channel estimation result and the long-term precoding matrix...

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Abstract

The invention discloses a method for realizing adaptive transmission by comprehensively utilizing long-time and short-time channel state information. A base station is adaptive to the variations of a long-time channel and a short-time channel in a way of concatenating long-time precoding and short-time precoding. The method specifically comprises that: a, a user acquires statistical channel information according to a channel estimation result, and transmits the acquired statistical channel information to the base station by a feedback channel; b, the user calculates an equivalent channel of ashort-time precoding domain according to the channel estimation result and a long-time precoding matrix used by a current sub-frame; c, the base station calculates a related parameter by utilizing the channel statistical information acquired from the feedback channel or from the statistical reciprocity of an uplink and a downlink, and performs long-time precoding; and d, the base station performsshort-time precoding by utilizing a rank indication (RI) parameter, a precoding matrix indication (PMI) parameter and a channel quality indication (CQI) parameter. The method has the fundamental characteristic of dynamically regulating long-time and short-time precoding parameters according to the variations of the long-time and short-time channel state information, and is applied to a high-ordermultiple input multiple output (MIMO) system.

Description

technical field [0001] The present invention relates to the field of 3GPP LTE (Long Term Evolution of the Third Generation Partnership Project) standardization process, in particular to an adaptive transmission scheme of a high-order multi-antenna transmission and multi-antenna reception (MIMO) system under various channel environments. Background technique [0002] The MIMO transmission technology using multi-antenna transmission and multi-antenna reception is the basic way to mine and utilize wireless resources in spatial dimensions and improve spectrum utilization and power utilization. It has been one of the mainstream technologies in the field of mobile communication research and development for more than ten years. With the rapid development of computers and integrated circuits, MIMO technology has gradually entered the actual communication system. In the latest standards such as 3GPP LTE and IEEE 802.16e, space-time coding, space-time transmit diversity, space-division...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/06H04L27/26
Inventor 高西奇胡敏霞金石江彬
Owner HUAWEI TECH CO LTD
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