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Method and device for determining channel state information

A channel state information and channel technology, applied in wireless communication, digital transmission systems, electrical components, etc., can solve problems such as system performance degradation, failure to reflect channel quality, mismatch between antenna structure and codebook, etc., to avoid system performance The effect of drop, good performance, simple design

Active Publication Date: 2013-09-18
ALCATEL LUCENT SHANGHAI BELL CO LTD
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Problems solved by technology

In this way, although the LTE Rel-10 codebook can well quantify the channel direction information of the equivalent channel, the channel quality indicator (CQI, Channel Quality Indicator) estimated by the user equipment side still cannot reflect the real channel quality
The problem of system performance degradation caused by the mismatch between the antenna structure and the codebook cannot be completely and completely solved

Method used

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  • Method and device for determining channel state information
  • Method and device for determining channel state information
  • Method and device for determining channel state information

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Embodiment Construction

[0015] In order to better understand the spirit of the present invention, it will be further described below in conjunction with some preferred embodiments of the present invention.

[0016] Channel state information usually includes two main contents: channel direction information and channel quality information; the former is usually quantized by a codebook, while the latter is reflected as a channel quality indicator. In the case that the antenna structure does not match the quantized codebook, the actual channel is transformed into an equivalent transformed channel through channel transformation, which can solve the problem of inaccurate channel direction information, but there is still a channel quality indication accuracy rate low problem. This is because the channel quality indicator estimated by the user equipment is based on an equivalent channel and does not know a specific transformation matrix, so the estimated channel quality indicator is not accurate when the tot...

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Abstract

The invention discloses a method and a device for determining channel state information. The method for determining channel state information according to the embodiment of the invention comprises the following steps that the CQI (channel quality indication) is estimated on the basis of converted equivalent channels; power regulation factors are used for regulating the estimated CQI, and the regulated CQI is shown as the accompanying drawing, wherein T is a linear conversion matrix for converting actual channels into the equivalent channels, and W is code words for quantizing the channel state information. The method and the device can be used for accurately determining the CQI under the condition of using the channel conversion, and the system performance reduction is avoided.

Description

technical field [0001] The present invention relates to a method and device for determining channel state information, in particular to a method and device for determining channel quality indication in channel state information. Background technique [0002] A uniform circular array (UCA, Uniform Circular Array) is a common antenna structure located in a base station, such as an evolved node base station (eNB, evolved Node Base), especially in a small cell for hotspot (hotspot) coverage. In the LTE Rel-10 (LTE, Long Term Evolution) system, due to the lack of a codebook specifically for uniform circular arrays, it is generally replaced by an LTE Rel-10 codebook designed for a uniform linear antenna array (ULA, Uniform Linear Antenna Array). The mismatch between the antenna structure and the codebook will inevitably produce large quantization errors and reduce the performance of the system. [0003] One method to solve this problem is to use a transform method to make a user ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L1/06H04W88/02H04W88/08
Inventor 武露刘皓杨红卫
Owner ALCATEL LUCENT SHANGHAI BELL CO LTD
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