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A self-interference cancellation method for full-duplex system based on particle filter

A particle filter, full-duplex technology, used in baseband systems, baseband system components, transmission systems, etc., can solve problems such as insufficient consideration of phase noise, and achieve the effect of high self-interference elimination performance gain

Active Publication Date: 2022-07-12
PEKING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the lack of consideration of the phase noise in the existing algorithm, thereby reducing the self-interference performance of the system, the present invention provides a self-interference elimination method for a full-duplex system based on a particle filter

Method used

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  • A self-interference cancellation method for full-duplex system based on particle filter
  • A self-interference cancellation method for full-duplex system based on particle filter
  • A self-interference cancellation method for full-duplex system based on particle filter

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Embodiment Construction

[0071] This embodiment provides a self-interference cancellation solution for a full-duplex system based on a particle filter.

[0072] figure 1 The architecture diagram of self-interference cancellation of the system is given, and corresponding signals can be obtained according to the content of the invention. Specifically, the example includes two steps.

[0073] First, the self-interfering channel estimation is done. The system works in the half-duplex stage, that is, there is no useful signal transmission, and the local node transmits the pilot signal to estimate the self-interference channel. Then the received signal can be expressed as

[0074] r(n)=hx(n)e jθ(n) +w(n)

[0075] where x(n) is the transmitted signal and w(n) is Gaussian noise, then the self-interference channel can be estimated by the following equation

[0076]

[0077] Among them, L is the number of transmitted signals used to estimate the channel.

[0078] Subsequently, the system enters the fu...

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Abstract

The invention discloses a full-duplex system self-interference elimination method based on particle filter. The method is: 1) operate the full-duplex system in the half-duplex stage, perform self-interference channel estimation, and obtain the estimated value of the self-interference channel; 2) operate the full-duplex system in the full-duplex stage and use the particle filter to track and estimate Phase noise estimation value at time n 3) The self-interfering signal is eliminated based on the self-interfering channel estimation value and the phase noise estimation value. The invention adopts the particle filter to track and estimate the change of phase noise, so that the self-interference signal at each moment can be more accurately reconstructed, and compared with the traditional scheme, it has a higher self-interference elimination performance gain, which is a further improvement of the full-duplex technology. Application lays the foundation.

Description

technical field [0001] The invention relates to the field of communication, in particular to a method for eliminating self-interference in a full-duplex communication system based on a particle filter. Background technique [0002] At present, in order to alleviate the contradiction between the shortage of spectrum resources and the increasing demand for bandwidth, scholars study the full duplex technology (Full Duplex, FD). Full-duplex technology can theoretically achieve double the spectral efficiency, and can solve the problem of hidden terminals, improve relay communication efficiency and enhance communication security. However, since the transmission and reception work at the same time and at the same frequency, the local receiver may receive a copy of the locally transmitted signal, that is, a self-interference signal (Self-Interference, SI). The strong self-interference signal will overwhelm the remote useful signal, so that the useful signal cannot be demodulated. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04L25/03H04L25/08H03H17/02
CPCH04L25/0202H04L25/08H04L25/03006H03H17/0288H03H17/0255
Inventor 管鹏鑫汪奕汝毕乘乾赵玉萍
Owner PEKING UNIV