Method and device for reconstituting channel state information self-adaptive interpolation

Abstract

The invention discloses a method and device for reconstituting a channel state information self-adaptive interpolation. The method comprises the steps that a receiver determines the number N of adjacent subcarriers with the correlation coefficients larger than a set threshold value according to the correlation of subscarrier channel state information, the grouping number Ns of the interpolation at each time is calculated, and at last channel state information is fed back to a transmitter in a grouping mode; after the transmitter receives the feedback information, the feedback information is analyzed first, and then the channel state information interpolation on the feedback subcarriers is used for obtaining the channel state information on subcarriers which do not feed back data in an OFDM symbol. According to the device, the receiver comprises a channel estimation module, a module for calculating the number of coherent bandwidths and the number of coherent bandwidth subcarriers, a module for calculating mutual coefficients between channel state information matrixes, an interpolation grouping number calculation module and a channel state information feedback module; the transmitter comprises a channel state information analysis module and a channel state information self-adaptive interpolation reconstitution module. Compared with a traditional clustering method for reconstituting the channel state information, the method and device can effectively lower the performance loss caused by grouped feedback.

Description

technical field [0001] The present invention relates to a method and device for adaptive interpolation and reconstruction of channel state information, in particular to an adaptive interpolation method for reconstructing channel state information by using the correlation between channel state information of sub-carriers in packet feedback beamforming and The device belongs to the technical field of wireless local area network. Background technique [0002] In Orthogonal Frequency Division Multiplexing (OFDM) Multiple Input Multiple Output (MIMO) wireless local area network, in order to improve the influence of frequency selective deep fading on the signal, the transmitter usually The streams are weighted, known as beamforming, to improve received signal quality. However, the design and implementation of the beamforming algorithm usually requires the transmitter to know the channel state information (Channel State Information, CSI). The channel state information obtained by...

AI Technical Summary

Problems solved by technology

For the clustering method, as the number of subcarriers in the cluster increases, the difference between the channel state information on the cluster boundary subcarriers and the channel state information on the feedback subcarriers increases, which will deteriorate the system performance.

The spherical interpolation method needs to feed back the phase rotation parameters of the right singular vector on the feedback subcarrier together with the right singular vector, and the optimal phase parameter must be obtained by searching, which increases the complexity of the system

Both of these schemes do not make full use of the correlation between the channel state information of the subcarriers to interpolate and reconstruct the channel state information

Images