Nonlinear feedback assisted full-duplex digital self-interference elimination method

A technology of self-interference cancellation and nonlinear feedback, which is applied in the field of communication, can solve problems such as high cost and no solution, and achieve the effect of improving wireless spectrum utilization and reducing costs

Inactive Publication Date: 2019-09-10
QINGYUAN POLYTECHNIC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This self-interference cancellation method has certain beneficial effects, but its cost is relatively higher, and the non-linear self-interference cancellation method and its related equipment that have both effective effects and low cost still need to be explored.
[0005] Regarding the signal self-interference processing of full-duplex communication equipment, there are still many practical problems that need to be dealt with in practical applications, and no specific solutions have been proposed.

Method used

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  • Nonlinear feedback assisted full-duplex digital self-interference elimination method
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  • Nonlinear feedback assisted full-duplex digital self-interference elimination method

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Embodiment 1

[0035] This embodiment provides a nonlinear feedback-assisted full-duplex digital self-interference cancellation method, which is suitable for communication equipment, and the communication equipment includes: an antenna unit, a baseband signal processing unit, a transmitting channel, a nonlinear feedback channel, and a receiving channel , Analog self-interference cancellation unit, including:

[0036]S101: The digital-to-analog conversion unit receives the digital transmission signal sent by the baseband signal processing unit;

[0037] S102: Perform digital-to-analog conversion processing according to the digital transmission signal to obtain an analog transmission signal;

[0038] S103: Perform power amplification processing according to the analog transmission signal to obtain a radio frequency transmission signal;

[0039] S104: Perform linear component elimination processing according to the radio frequency transmission signal to obtain a nonlinear feedback signal;

[...

Embodiment 2

[0056] This embodiment provides a nonlinear feedback-assisted full-duplex digital self-interference cancellation method, which is suitable for communication equipment, and the communication equipment includes: an antenna unit, a baseband signal processing unit, a transmitting channel, a nonlinear feedback channel, and a receiving channel , Analog self-interference cancellation unit, including:

[0057] S101: The digital-to-analog conversion unit receives the digital transmission signal sent by the baseband signal processing unit;

[0058] S102: Perform digital-to-analog conversion processing according to the digital transmission signal to obtain an analog transmission signal;

[0059] S103: Perform power amplification processing according to the analog transmission signal to obtain a radio frequency transmission signal;

[0060] S104: Perform linear component elimination processing according to the radio frequency transmission signal to obtain a nonlinear feedback signal;

...

Embodiment 3

[0120] Based on the fact that this embodiment is basically the same as Embodiment 2, the difference is that in practical applications, the method of estimating the maximum likelihood value of the coefficient β can also be:

[0121] by h u and h v It can be seen from the definition that

[0122] h u =βh v (20)

[0123] Therefore, the maximum likelihood estimate of β is:

[0124]

[0125] In summary, a nonlinear feedback-assisted full-duplex digital self-interference cancellation method disclosed in the present invention has technical effects including: 1. By eliminating the dominant linear part in the feedback signal, the feedback channel The analog-to-digital converter mainly expresses the nonlinear part, and the high-precision analog-to-digital converter may not be used, which reduces the overall cost; 2. Feedback-assisted digital self-interference cancellation receives the coupled RF signal to be transmitted by adding a feedback channel, so that The signal affected...

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Abstract

The invention provides a nonlinear feedback assisted full-duplex digital self-interference elimination method. The method comprises the following steps: receiving a digital transmission signal sent bya baseband signal processing unit; performing digital-to-analog conversion processing according to the digital transmission signal to obtain an analog transmission signal; performing power amplification processing according to the analog emission signal to obtain a radio frequency emission signal; performing linear component elimination processing according to the radio frequency emission signalto obtain a nonlinear feedback signal; and eliminating the self-interference signal contained in the digital receiving signal received by the receiving channel according to the nonlinear feedback signal and the digital transmitting signal to obtain a far-end signal after digital self-interference elimination. According to the invention, the dominant linear part in the feedback signal can be eliminated, so that the analog-to-digital converter in the feedback channel mainly expresses the nonlinear part, a high-precision analog-to-digital converter can be not used, and the overall cost is reduced.

Description

technical field [0001] The invention relates to the communication field, in particular to a nonlinear feedback-assisted full-duplex digital self-interference elimination method. Background technique [0002] The full-duplex transceiver channels work in the same frequency band at the same time. Today, as spectrum resources are increasingly exhausted, full-duplex has a huge appeal that can theoretically double the spectral efficiency of wireless communication. In engineering applications, full-duplex wireless communication is faced with the problem of self-interference caused by local transmission signals to the receiving channel, and it is necessary to jointly use two or more self-interference cancellation technologies in the antenna domain, analog domain, and digital domain to restrain it. Digital self-interference cancellation is the last necessary elimination method, and the remaining self-interference will be the final residual self-interference, so the impact on the fina...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/40H04B1/525H04L5/14
CPCH04B1/40H04B1/525H04L5/14
Inventor 张志亮刘英王小红罗芳
Owner QINGYUAN POLYTECHNIC
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