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Signal-to-noise ratio feedback method and device

A signal-to-noise ratio and feedback method technology, applied in the field of signal-to-noise ratio feedback methods and devices, can solve the problems of waste of feedback overhead and large difference in SNR dynamic range, and achieve the effect of reducing feedback overhead and saving communication resources

Inactive Publication Date: 2015-01-21
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, since the SNR dynamic range of each space-time stream in the MIMO system is quite different, using the equal number of bits and equal step size to feed back the SNR may cause a waste of feedback overhead

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  • Signal-to-noise ratio feedback method and device
  • Signal-to-noise ratio feedback method and device

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Embodiment Construction

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0019] In order to solve the problem of large SNR feedback error, embodiments of the present invention provide a SNR feedback method and device.

[0020] In the method for sending a signal-to-noise ratio (SNR) in this embodiment, in a WLAN system, a beam receiver (beamformee) performs SNR feedback to a beamformer (beamformer). This flow is described as the processing flow of the beam receiver. Such as figure 1 As shown, the signal-to-noise ratio feedback met...

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Abstract

Disclosed are a method and a device for signal to noise ratio feedback, relating to the communication field, so as to solve the problem that the signal to noise ratio feedback error is large. The method comprises: determining a signal to noise ratio distribution range of a space-time stream; determining the number of feedback bits or the feedback step length, or the number of feedback bits as well as the feedback step length according to the signal to noise ratio distribution range; and sending a signal to noise ratio of the space-time stream by use of the number of feedback bits, or, sending a signal to noise ratio of a time-space stream by use of the feedback step length, or, sending the signal to noise ratio of the time-space stream by use of the number of feedback bits and the feedback step length. Embodiments of the present invention are applicable to multi-antenna systems such as an MIMO system.

Description

technical field [0001] The invention relates to the communication field, in particular to a signal-to-noise ratio feedback method and device. Background technique [0002] In a multiple input multiple output (MIMO) system, the transmitting end uses beamforming technology to precode data, and transmits the data to the receiving end through multiple space-time streams. The receiving end needs to feed back the signal-to-noise ratio (Signal to Noise Ratio, SNR) of each space-time stream to the transmitting end, so that the transmitting end allocates different transmission powers for each space-time stream according to the SNR. [0003] In a MIMO system, the SNR of the space-time stream can include the average signal-to-noise ratio (SNR_average) of the space-time stream in all subcarriers and the signal-to-noise ratio (PT-SNR) of the space-time stream per carrier, etc., and the existing technology uses equal bits Feedback the SNR of each space-time stream in the way of number an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B7/08H04L1/06
CPCH04B17/24H04B17/336
Inventor 李云波李斌伍天宇
Owner HUAWEI TECH CO LTD
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