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Method and device for feeding back channel signal-to-noise ratio (SNR)

A technology of signal-to-noise ratio and average signal-to-noise ratio, applied in the field of communication, can solve the problems of increased feedback overhead, performance loss, and difficulty in implementation, and achieve the effect of reducing dynamic range and improving accuracy

Inactive Publication Date: 2012-07-04
HUAWEI TECH CO LTD
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Problems solved by technology

At this point, if you continue to use a full-band SNR plus per-carrier difference feedback method, without increasing the feedback bit, it will cause performance loss because the carrier SNR exceeds the feedback range. If you increase the per-carrier Feedback bits to improve the feedback dynamic range will greatly increase the feedback overhead
Therefore, it is difficult to achieve the signal-to-noise ratio of each carrier as accurately as possible without increasing the number of feedback bits.

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  • Method and device for feeding back channel signal-to-noise ratio (SNR)
  • Method and device for feeding back channel signal-to-noise ratio (SNR)

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Embodiment Construction

[0020] In order to support the subsequent multi-user multi-antenna system (MU-MIMO) and better use of beamforming technology, it is necessary to increase the signal-to-noise ratio on each carrier. When feeding back the signal-to-noise ratio on each carrier, it is necessary to feed back the average signal-to-noise ratio of the sub-bands in the full frequency band, and what is fed back is the difference between the real signal-to-noise ratio and the average signal-to-noise ratio on this carrier. This difference is called is PT-SNR. Feedback of the average signal-to-noise ratio by means of molecular bands can realize the feedback of the signal-to-noise ratio of each carrier as accurately as possible with little increase in the number of feedback bits.

[0021] figure 1 It is a schematic diagram of the entire communication frequency band divided into two sub-bands. A full frequency band is divided into 2 sub-bands, each sub-band contains multiple sub-carriers, and it is also pos...

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Abstract

The embodiment of the invention provides a method for feeding back a channel signal-to-noise ratio (SNR). The method comprises the following steps of: sending a sub-band average SNR which is equal to the sum of SNRs on data sub-carriers included in a sub-band corresponding to the sub-band average SNR divided by the number of the data sub-carriers included in the sub-band corresponding to the sub-band average SNR; and sending a carrier SNR which is equal to the difference between the SNR on the data sub-carriers included in the sub-band corresponding to the sub-band average SNR and the sub-band average SNR. By adoption of the method, the performance of SNR feedback by feeding back the average SNR in various sub-bands is improved. Meanwhile, the embodiment of the invention also provides a device for implementing the method.

Description

technical field [0001] The embodiments of the present invention relate to communication technologies, and in particular to a method and a device for a signal-to-noise ratio feedback method in a wireless local area network. Background technique [0002] At present, WLAN has become an important way of indoor wireless access. With the development of communication technology, in order to meet the needs of high-speed access, the transmission bandwidth of WLAN has also increased from 40MHz to 80MHz, and even to 160MHz, and the maximum number of antennas has also increased from 4 to 8. [0003] In current WLAN systems, beamforming technology is mostly adopted to effectively improve system throughput. The beamforming technology needs to know the channel state information or the beamforming matrix, and the beamforming matrix is ​​also called V matrix. In the current standard, the system feeds back the average signal-to-noise ratio (SNR_average) on all data carriers in the entire fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/16H04L1/06H04L1/00
CPCH04B7/066H04B7/0632
Inventor 李云波李斌李靖
Owner HUAWEI TECH CO LTD
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