Cross-band MIMO spatial domain statistical CSI estimation method

Abstract

The invention relates to a cross-band MIMO spatial domain statistical CSI estimation method, which comprises the following steps: firstly, based on the similarity of different frequency channels in the same cross-band MIMO system on an angle domain and the transformation relationship between statistical CSI on the angle domain and the spatial domain; elements in a channel space domain covariance matrix on different frequencies are modeled into a function only related to array element sequence numbers, wavelengths and array element intervals, and then estimation of the space domain covariance matrix is converted into an extrapolation problem of the function. Establishing a linear extrapolation model of a channel covariance element under two scenes of ULA and UPA configured on a base station side, and solving extrapolation coefficients in the two scenes; and finally, estimating channel covariance matrixes on all other frequencies through an extrapolation model under the condition that the channel covariance matrix on one frequency is known. Compared with a traditional method, the method greatly reduces the measurement overhead, is low in implementation complexity, and is higher in estimation precision compared with a traditional interpolation method.

Description

technical field [0001] The invention belongs to the field of communication, and in particular relates to establishing a linear extrapolation model under the condition of knowing a channel covariance matrix on a certain frequency in a cross-frequency band communication system to complete the conversion between channel covariances of different frequencies. Background technique [0002] With the rapid development of Massive Multiple-Input Multiple-Output (MIMO, Multiple-Input Multiple-Output) technology, the number of users connected to the system is increasing, and the capacity requirements of the system are also increasing. The scarcity of resources has also led to the continuous research and utilization of higher frequency channel resources. Therefore, it is more and more common for a system to communicate on multiple frequencies at the same time. For example, WLAN usually works on two frequencies of 2.4GHz and 5GHz. The dual-card dual-standby communication device is also a ...

AI Technical Summary

Problems solved by technology

[0004] Technical problem: For cross-band MIMO systems, the present invention provides a cross-band MIMO spatial domain statistical CSI estimation method, that is, a spatial domain channel covariance estimation method suitable for ULA and UPA array forms. Under the condition of the channel covariance matrix on one frequency, use the linear method to extrapolate the channel covariance matrix on the other frequencies, avoiding the measurement and calculation on all frequencies, making full use of the correlation between different frequencies, and reducing the system overhead and implementation complexity

Images