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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: 2012-07-18
HUAWEI TECH CO LTD
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  • Claims
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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

The invention discloses a signal-to-noise ratio feedback method and a signal-to-noise ratio feedback device and relates to the communication field. The signal-to-noise ratio feedback method and the signal-to-noise ratio feedback device solve the problem that the feedback error of signal-to-noise ratio is larger. The signal-to-noise ratio feedback method comprises the steps of determining the signal-to-noise ratio distribution range of a space-time stream; determining feedback bit, or feedback step or both the feedback bit and the feedback step according to the signal-to-noise ratio distribution range; and adopting the feedback bit to transmit the signal-to-noise ratio of the space-time stream, or adopting the feedback step to transmit the signal-to-noise ratio of the space-time stream, or adopting the feedback bit and the feedback step to transmit the signal-to-noise ratio of the space-time stream. The signal-to-noise ratio feedback method and the signal-to-noise ratio feedback device can be applied in multi-antenna systems such as multiple input multiple output (MIMO) systems.

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, a transmitting end uses beamforming technology to precode data, and transmits the data to a 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 sending end, so that the sending end allocates different transmission powers to 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 on all subcarriers and the signal-to-noise ratio (PT-SNR) of the space-time stream per carrier, etc., and the prior art uses equal bits Feedback the SNR of each space-time stream in the way of number and equal step size. For e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/08H04L1/06
CPCH04B17/0067H04B17/006H04B17/336H04B17/24
Inventor 李云波李斌伍天宇
Owner HUAWEI TECH CO LTD
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