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Self-interference cancellation method with cascaded time-frequency domain and polarization domain processing in full-duplex communication

A self-interference cancellation, time-frequency domain technology, applied in duplex signal operation, shaping network in transmitter/receiver, baseband system components, etc., can solve problems such as limiting the performance of baseband self-interference cancellation, and achieve applicability And the effect of good versatility, increased gain, and avoidance of repeated use

Active Publication Date: 2017-02-22
BEIJING UNIV OF POSTS & TELECOMM
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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-frequency information, and self-interference cancellation of radio frequency will limit the performance of self-interference cancellation of baseband

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  • Self-interference cancellation method with cascaded time-frequency domain and polarization domain processing in full-duplex communication
  • Self-interference cancellation method with cascaded time-frequency domain and polarization domain processing in full-duplex communication
  • Self-interference cancellation method with cascaded time-frequency domain and polarization domain processing in full-duplex communication

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Embodiment Construction

[0020] The present invention will be further described in detail with reference to the accompanying drawings and embodiments.

[0021] The present invention utilizes the method of combining the polarization dimension and the time-frequency dimension, the self-interference elimination method of the radio frequency remains unchanged, and the self-interference elimination of the polarization dimension is realized in the baseband, and the gain of the self-interference elimination is improved. It should be noted that the technology of the present invention requires the local transmitter and the remote transmitter to perform vector signal processing to endow the transmitted signal with a predetermined polarization state. The technology of the present invention also needs to equip each communication node with two pairs of orthogonal dual-polarization antennas, one for sending polarized signals and one for receiving polarized signals.

[0022] Such as figure 2 As shown, the present ...

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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...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03H04L5/14
Inventor 冯春燕刘瑶郭彩丽曾志民厉东明
Owner BEIJING UNIV OF POSTS & TELECOMM
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