Method for eliminating self-interferences of cascade time-frequency domain and polarization domain processing during full-duplex communication

Abstract

The invention provides a method for eliminating self-interferences of cascade time-frequency domain processing and polarization domain processing during full-duplex communication and belongs to the technical field of wireless communication. A quadrature dual polarized antenna used for transmitting and receiving polarization signals is equipped at every communication node, and a local node is subjected to polarized digital signal processing. The method includes that self-interferences of radio frequency of a time-frequency domain are eliminated by a receiving end; polarized signals subjected to radio frequency self-interference elimination are transmitted to a base band via down conversion, an oblique projection polarization filtering operator is constructed according to a transcendental self-interference polarization state and an expected signal polarization state, and polarization filtering is performed; matching and receiving of expected signals are performed according to the principle that the output signal to interference plus noise power ratio is maximum. The method for eliminating self-interferences of cascade time-frequency domain processing and polarization domain processing during full-duplex communication has the advantages that the problem that self-interferences and expected signals in a traditional scheme are overlapped and difficult to distinguish, self-interference elimination is performed by utilizing polarized dimensionality information of the signals in the base band, repeated utilization of time frequency information is avoided, self-interference elimination gain is increased and the purpose of eliminating self-interferences is realized.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and specifically refers to a self-interference elimination method in which time-frequency domain and polarization domain processing are cascaded in full-duplex communication. Background technique [0002] With the development of wireless communication technology and services, wireless networks are facing a contradiction between limited spectrum resources and the demand for spectrum resources by a large number of services. For this reason, the industry has proposed simultaneous and same-frequency full-duplex technology (hereinafter referred to as full-duplex), which realizes the functional requirements of both communication parties using the same spectrum resources for simultaneous communication through self-interference cancellation technology, and improves spectrum utilization. And it has the potential advantages of solving the legacy problems of traditional wireless communication...

AI Technical Summary

Problems solved by technology

The disadvantage of this approach is that the two self-interference reconstructions of radio frequency and baseband rely on limited time-freque

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