Method for eliminating MIMO (Multiple Input Multiple Output) full-duplex self-interference under influence of power amplifier nonlinearity based on polarized oblique projection

A self-interference elimination, nonlinear technology, applied in the direction of duplex signal operation, climate sustainability, radio transmission system, etc., can solve the problem of large residual self-interference, and achieve the effect of eliminating self-interference

Active Publication Date: 2017-02-22
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, in an actual system, if the mathematical model used for the nonlinear modeling of the power amplifier does not match the actual characteristics of the power amplifier, then when the transmit power is relatively large, the residual self-interference caused by this mismatch will be very large. large and thus severe self-interference cancellation performance

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  • Method for eliminating MIMO (Multiple Input Multiple Output) full-duplex self-interference under influence of power amplifier nonlinearity based on polarized oblique projection
  • Method for eliminating MIMO (Multiple Input Multiple Output) full-duplex self-interference under influence of power amplifier nonlinearity based on polarized oblique projection
  • Method for eliminating MIMO (Multiple Input Multiple Output) full-duplex self-interference under influence of power amplifier nonlinearity based on polarized oblique projection

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Embodiment Construction

[0018] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0019] The invention provides a MIMO full-duplex self-interference elimination method under the nonlinear influence of a power amplifier based on polarization oblique projection.

[0020] The present invention adopts such as figure 1 The full-duplex system model is shown. The system uses dual-polarized antennas with orthogonal polarization states at the transmitting end to transmit multi-channel signals, and multiple pairs of orthogonal dual-polarized antennas are used at the receiving end to receive and process signals. The difference from the traditional MIMO full-duplex system is that the system processes the polarization information of the signal through two paths of the orthogonal dual-polarized antenna at the receiving end.

[0021] For the transmitter, use x(n) to represent the original baseband transmission signal, when affected by the nonli...

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Abstract

The invention discloses a method for eliminating MIMO (Multiple Input Multiple Output) full-duplex self-interference under the influence of power amplifier nonlinearity based on a polarized oblique projection, and belongs to the technical field of wireless communication. In the method, an oblique projection matrix is constructed at a receiving end according to polarization states of a self-interference signal and a desired signal through a polarization domain of signals, and self-interference is projected onto a null space of the projection matrix, so that the aim of eliminating self-interference is fulfilled, and the desired signal can be kept. Through adoption of the method, modeling of the power amplifier nonlinearity is not needed; no complicated pre-estimation algorithm is used; high real-time performance is achieved; and self-interference of a system can be eliminated effectively under the condition that system transmitting power increases continuously.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, in particular to full-duplex communication technology and self-interference elimination in the full-duplex communication system. Specifically, it refers to a MIMO full-duplex self-interference cancellation method under the nonlinear influence of a power amplifier based on oblique polarization projection. Background technique [0002] Full-duplex communication can realize two-way communication at the same time and in the same frequency band. Compared with traditional time division and frequency division technology, full-duplex technology can greatly improve the transmission data rate of the system. A key challenge in full-duplex communication is to eliminate self-interference between the same transceiver, and this self-interference signal is usually 60dB to 100dB higher than the desired signal. [0003] In a full-duplex system, the self-interference caused by the nonlinear distorti...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/0413H04B1/52H04L5/14
CPCH04B1/525H04B7/0413H04L5/14Y02D30/70
Inventor 冯春燕赵闻刘芳芳郭彩丽
Owner BEIJING UNIV OF POSTS & TELECOMM
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