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Digital self-interference eliminating method of zero-medium-frequency full-duplex transceiver

A self-interference elimination, full-duplex technology, applied in electrical components, transmission systems, etc., can solve the problems of amplifying self-interference, damaging the performance of full-duplex systems, reducing the signal-to-interference-noise ratio of received signals, and achieving fast convergence speed, High practical value, small error effect

Active Publication Date: 2018-06-01
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the case of high transmit power, the nonlinear distortion of the transmitter power amplifier will amplify these derived self-interferences, which will further reduce the signal-to-interference-noise ratio of the received signal and damage the performance of the full-duplex system

Method used

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  • Digital self-interference eliminating method of zero-medium-frequency full-duplex transceiver
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  • Digital self-interference eliminating method of zero-medium-frequency full-duplex transceiver

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Embodiment Construction

[0042] The present invention will be further clarified below in conjunction with specific embodiments and accompanying drawings.

[0043] Such as figure 1 As shown, the transmission chain of the zero-IF full-duplex transceiver includes a digital baseband processor (not shown in the figure), a digital-to-analog converter 1, a first low-pass filter 2, a local oscillator 3, and an up-conversion modulator 4. Components such as the first variable gain amplifier 5, the power amplifier 6, and the transmitting / receiving antenna 7. The receiving chain of this structure includes a transmitting / receiving antenna 7, a bandpass filter 8, a circulator 9, an analog self-interference canceller 10, a low noise amplifier 11, a variable gain amplifier 12, a down-conversion demodulator 13, a second low Pass filter 14, analog-to-digital converter 15, digital self-interference canceller 16 and other devices.

[0044] The structure of the zero-IF full-duplex transceiver, and its typical parameters...

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Abstract

The invention discloses a digital self-interference eliminating method of a zero-medium-frequency full-duplex transceiver. The method is mainly applied to a digital self-interference eliminator, and the self-interference in the signal transmission link of the transceiver is estimated according to the digital signal obtained after sampling of the receiving end and known digital waveforms of the transmitting end. The method can eliminate self-interference generated by a transmitter under ideal components, the image self-interference generated by IQ imbalance of a transmitting chain up-conversionmodulator and a receiving chain down-conversion demodulator nonlinear self-interference generated by transmission chain power amplifier distortion, and image nonlinear self-interference caused by combination of IQ imbalance and power amplifier distortion. The method, compared with a traditional augmented complex LMS algorithm, can obtain an ideal self-interference eliminating effect and a relatively high convergence speed when the power of the transmitting signals is large, and the method is good in practicability.

Description

technical field [0001] The invention belongs to the field of signal processing and wireless communication, in particular to a digital self-interference elimination method for a zero-IF full-duplex transceiver. Background technique [0002] Full-duplex is a technical means to realize the two-way transmission of the transmitted signal and the received signal at the same time and at the same frequency. Using full-duplex technology, spectral efficiency and energy efficiency can be improved. In a full-duplex transceiver, since the transmitted signal will be incorporated into the received signal through coupling, reflection, etc., self-interference will be formed. The self-interference problem is the most important and the most researched problem in the design of full-duplex circuits. [0003] Existing full-duplex circuit structures usually adopt multi-level self-interference cancellation methods, including circulator cancellation, analog self-interference cancellation and digit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/40H04B1/525
CPCH04B1/40H04B1/525
Inventor 夏亦犁李喆裴文江王开达尼洛·曼迪奇
Owner SOUTHEAST UNIV
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