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CN116032707B - TDD wireless communication anti-interference method and device - Google Patents

TDD wireless communication anti-interference method and device Download PDF

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Publication number
CN116032707B
CN116032707B CN202211613215.1A CN202211613215A CN116032707B CN 116032707 B CN116032707 B CN 116032707B CN 202211613215 A CN202211613215 A CN 202211613215A CN 116032707 B CN116032707 B CN 116032707B
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signal
interference
digital
interference signal
cancellation
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CN116032707A (en
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张玉龙
程道辉
喻竹希
吕佳欢
双炜
赵星影
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Aerospace Xingyun Technology Co ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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    • Y02D30/70Reducing energy consumption in communication networks in wireless communication networks

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Abstract

The invention discloses an anti-interference method for TDD wireless communication, which comprises the following steps: receiving a superimposed interference signal S & I (t); performing superposition cancellation on the amplitude phase controlled signal A, R_I (t-tau) and the superposition interference signal S & I (t), and then sampling to obtain a digital signal S1 (n); performing feature analysis on the digital signal S1 (n); the superimposed interference signal is a single-tone/multi-tone signal, and the interference signal frequency f and the interference signal power P_I of the digital signal S1 (n) are regenerated to be used as an interference cancellation signal R_I (t); the superimposed interference signal is a non-mono/non-multi-tone signal, and then the digital signal S1 (n) is subjected to adaptive filtering to obtain an interference estimation signal R_I_w (n); an amplitude phase controlled signal a R _ I (t- τ) is generated. The invention also discloses a TDD wireless communication anti-interference device. The invention utilizes the TDD working mode of the system and utilizes the transmitting channel to generate the analog interference cancellation signal in the receiving state, thereby reducing the complexity of hardware and improving the response speed of anti-interference.

Description

TDD wireless communication anti-interference method and device
Technical Field
The invention belongs to the technical field of wireless communication, and particularly relates to an anti-interference method and device for TDD wireless communication.
Background
Wireless communication is widely deployed, and many communication networks are networked using wireless channels. For example, a wireless ad hoc network is a communication network working based on a TDD duplex mode, and each node automatically forms a network according to a protocol. Each node of the network has a wireless receiving and transmitting function, and each node of the network has mobility and multi-hop property. The method is independent of preset infrastructure, has the characteristics of capability of temporary networking, quick deployment, no control center, strong survivability and the like, has wide application prospect in military and civil aspects, and is a hotspot in network research.
However, as with other wireless communication networks, ad hoc networks are subject to interference, particularly malicious in-band interference in battlefield environments. These interfering signals are not characterized identically, and there are single/multitone interference, as well as modulation-like signal interference. How to effectively cancel such interference in the receiver of each node is valuable and necessary to improve reception performance and to enhance the survivability of the network under hostile interference.
The anti-interference technology of wireless communication is in progress, and there are many technologies that can perform interference suppression, such as a deep learning-based method and various intelligent spectrum sensing method strategies. However, such strategies require stations with high signal processing speeds, large memory capacity, and feedback channels, and require extremely high demands on end-use products, particularly hand-held stations. In addition, the algorithm focuses on suppression in the digital domain, the achievable suppression ratio is limited, the convergence speed is slower, and the response time to the burst interference is longer.
Disclosure of Invention
The invention aims to provide an anti-interference method and device for TDD wireless communication, which are used for solving the problems of high signal processing requirement, high hardware complexity, small interference suppression, low convergence rate and single mode in the existing anti-interference technology.
In order to solve the technical problems, the invention provides an anti-interference method for TDD wireless communication, which comprises the following steps:
receiving a superimposed interference signal S & I (t);
performing superposition cancellation on the amplitude phase controlled signal A, R_I (t-tau) and the superposition interference signal S & I (t), and then sampling to obtain a digital signal S1 (n);
performing feature analysis on the digital signal S1 (n) to obtain an analysis result; judging whether the superimposed interference signal is a single-tone/multitone signal or a non-single-tone/non-multitone signal according to the analysis result;
if the superimposed interference signal is a mono/multitone signal, then adaptively filtering the digital signal S1 (n) to obtain an error signal e (n) and an interference estimation signal r_i_w (n); when the error signal e (n) converges, the interference signal frequency f and the interference signal power P_I of the digital signal S1 (n) are regenerated to obtain a regenerated signal, the interference estimation signal R_I_w (n) is regulated to obtain a regulating signal, and the regenerated signal and the regulating signal are added to be used as the interference signal R_I (n);
if the superimposed interference signal is a non-mono/non-multi-tone signal, performing adaptive filtering on the digital signal S1 (n) to obtain an interference estimation signal R_I_w (n); adjusting the interference estimation signal R_I_w (n) as an interference signal R_I (n);
from the interference signal r_i (n) and the digital signal S1 (n), an amplitude phase controlled signal a_r_i (t- τ) is generated.
Preferably, the superposition cancellation is performed on the amplitude phase controlled signal a_r_i (t- τ) and the superposition interference signal S & I (t), and then the digital signal S1 (n) is obtained by sampling, which specifically includes the following steps:
the method comprises the steps of performing superposition cancellation on an amplitude phase controlled signal A_R_I (t-tau) and a superposition interference signal S & I (t) through a combiner to generate a combined output signal S1 (t);
the combined output signal S1 (t) is sampled to a digital signal S1 (n) by an ADC module.
Preferably, if the superimposed interference signal is a mono/multitone signal, the digital signal S1 (n) is adaptively filtered to obtain an error signal e (n) and an interference estimation signal r_i_w (n); when the error signal e (n) converges, the interference signal frequency f and the interference signal power p_i of the digital signal S1 (n) are regenerated to obtain a regenerated signal, and the interference estimation signal r_i_w (n) is adjusted to obtain an adjustment signal, and the regenerated signal and the adjustment signal are added as the interference signal r_i (n), specifically comprising the steps of:
if the superimposed interference signal is a mono/multitone signal, the interference signal frequency f and the interference signal power p_i of the digital signal S1 (n) are measured;
iteratively converging the interference signal frequency f and the interference signal power P_I of the digital signal S1 (n) to generate the amplitude A and the phase tau of the digital signal S1 (n), and obtaining a power error signal E_P according to the adjacent two iterative interference signal powers P_I;
according to the power error signal E_P, performing adaptive filtering on the digital signal S1 (n) to obtain an error signal E (n) and an interference estimation signal R_I_w (n);
when the error signal e (n) converges, the interference signal frequency f and the interference signal power p_i of the digital signal S1 (n) are regenerated to obtain a regenerated signal, and the interference estimation signal r_i_w (n) is subjected to rate, magnitude and phase adjustment to obtain an adjustment signal, and both the regenerated signal and the adjustment signal are added as the interference signal r_i (n).
Preferably, if the superimposed interference signal is a non-mono/non-multi-tone signal, the digital signal S1 (n) is adaptively filtered to obtain an error signal e (n) and an interference estimation signal r_i_w (n); adjusting the interference estimation signal R_I_w (n) as an interference signal R_I (n); the method specifically comprises the following steps:
if the superimposed interference signal is a non-mono/non-multi-tone signal, the interference signal frequency f and the interference signal power p_i of the digital signal S1 (n) are measured;
iteratively converging the interference signal frequency f and the interference signal power P_I of the digital signal S1 (n) to generate the amplitude A and the phase tau of the digital signal S1 (n), and obtaining a power error signal E_P according to the adjacent two iterative interference signal powers P_I;
according to the power error signal E_P, performing adaptive filtering on the digital signal S1 (n) to obtain an interference estimation signal R_I_w (n); the interference estimation signal r_i_w (n) is rate, magnitude, and phase adjusted as an interference signal r_i (n).
Preferably, the amplitude phase controlled signal a_r_i (t- τ) is generated from the interference signal r_i (n) and the digital signal S1 (n); the method specifically comprises the following steps:
performing digital-to-analog signal conversion on the interference signal R_I (n) to generate an interference cancellation signal R_I (t);
and generating an amplitude-phase controlled signal A, R_I (t-tau) according to the interference cancellation signal R_I (t), the amplitude A and the phase tau of the digital signal S1 (n), and sending the amplitude-phase controlled signal A, R_I (t-tau) to a combiner.
Preferably, the digital signal S1 (n) is subjected to feature analysis by an interference signal feature recognition algorithm, so as to generate an analysis result, an interference signal frequency f and an interference signal power p_i.
Preferably, the interference signal frequency f and the interference signal power p_i are iteratively converged by an analog cancellation algorithm to generate an amplitude a and a phase τ, and a power error signal e_p is obtained according to two adjacent iterative interference signal powers p_i.
The invention also provides an anti-interference device for TDD wireless communication, which comprises:
a combiner for performing superposition cancellation on the amplitude phase controlled signal a_r_i (t- τ) and the superposition interfering signal S & I (t);
the ADC module is used for sampling to obtain a digital signal S1 (n);
the first control module is used for carrying out characteristic analysis on the digital signal S1 (n) to obtain an analysis result; the analysis result includes that the superimposed interference signal is a single-tone/multi-tone signal or that the superimposed interference signal is a non-single-tone/non-multi-tone signal;
the second control module is used for carrying out self-adaptive filtering on the digital signal S1 (n) to obtain an error signal e (n) and an interference estimation signal R_I_w (n);
a third control module for generating an interference signal r_i (n) for an interference signal frequency f and an interference signal power p_i according to the interference estimation signal r_i_w (n) and the digital signal S1 (n);
the fourth control module is used for generating an amplitude phase controlled signal A, R_I (t-tau) according to the interference signal R_I (n) and the digital signal S1 (n).
Compared with the prior art, the invention has the beneficial effects that:
the invention provides an in-band anti-interference method and device for TDD wireless communication, which utilize a system TDD working mode to generate an analog interference cancellation signal by utilizing a transmitting channel in a receiving state, reduce hardware complexity and improve anti-interference response speed. Meanwhile, the digital cancellation is utilized to further inhibit interference, so that double-loop mixed interference cancellation is realized, and the inhibition degree of interference signals is improved.
Drawings
The following describes the embodiments of the present invention in further detail with reference to the accompanying drawings.
FIG. 1 is a topology diagram of a TDD wireless communication anti-jamming device according to the present invention;
FIG. 2 is a functional block diagram of a first control module;
FIG. 3 is a functional block diagram of a second control module;
FIG. 4 is a functional block diagram of a third control module;
FIG. 5 is a flow chart of an anti-interference method for TDD wireless communication according to the present invention;
FIG. 6 is a superimposed tone interference signal spectrum;
FIG. 7 is a reproduced interference signal spectrum;
FIG. 8 is a spectrum of an analog cancellation iteration signal;
FIG. 9 is a digital cancellation iteration convergence signal spectrum;
fig. 10 is a mixture of post-cancellation signal spectrum and time domain waveforms.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than those herein described, and those skilled in the art will readily appreciate that the present invention may be similarly embodied without departing from the spirit or essential characteristics thereof, and therefore the present invention is not limited to the specific embodiments disclosed below.
The terminology used in the one or more embodiments of the specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the one or more embodiments of the specification. As used in this specification, one or more embodiments and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used in one or more embodiments of the present specification refers to and encompasses any or all possible combinations of one or more of the associated listed items.
It should be understood that, although the terms first, second, etc. may be used in one or more embodiments of this specification to describe various information, these information should not be limited by these terms. These terms are only used to distinguish one type of information from another. For example, a first may also be referred to as a second, and similarly, a second may also be referred to as a first, without departing from the scope of one or more embodiments of the present description. The word "if" as used herein may be interpreted as "at … …" or "at … …" or "responsive to a determination", depending on the context.
The invention is described in further detail below with reference to fig. 1-10:
the invention provides a TDD wireless communication anti-interference device, which consists of two parts, including a digital cancellation unit and an analog cancellation unit;
the digital cancellation unit comprises a first control module, a second control module and a third control module; the first control module is responsible for carrying out interference characteristic recognition on the digital signal S1 (n), generating an analog cancellation algorithm and generating a mixed cancellation flow control algorithm. The second control module is responsible for adaptively filtering the digital signal S1 (n); the third control module is responsible for interfering signal regeneration.
The analog cancellation unit comprises a signal combiner and a fourth control module; the fourth control module is responsible for receiving the control signal ctrl_3 and the interference cancellation signal r_i (t), and linearly changing the amplitude and phase of the output signal. The combiner is responsible for superposing the received signal and the output signal of the fourth control module to realize the simulation cancellation of the interference signal.
Wherein:
the first control module performs feature analysis on the digital signal S1 (n) to generate control signals Ctrl_1, ctrl_2 and Ctrl_3; the first control module sends a control signal Ctrl_1 to the second control module and sends a control signal Ctrl_3 to the fourth control module; the first control module judges whether to send a control signal Ctrl_2 to a third control module according to the error signal e (n);
the second control module carries out self-adaptive filtering on the digital signal S1 (n) to obtain an error signal e (n), an interference estimation signal R_I_w (n) and a final modulus mixed and canceled signal S (n); the second control module sends an error signal e (n) to the first control module, sends an interference estimation signal R_I_w (n) to the third control module, and sends a final modulus mixed cancellation signal S (n) to the modulation and demodulation module;
the third control module generates an interference signal R_I (n) according to the control signal Ctrl_2 and the interference estimation signal R_I_w (n), and sends the interference signal R_I (n) to the DAC module;
the DAC module performs digital-to-analog signal conversion on the interference signal R_I (n) to generate an interference cancellation signal R_I (t), and sends the interference cancellation signal R_I (t) to the PA module and the fourth control module;
the PA module performs power amplification on an interference signal R_I (n) to generate a transmission signal;
the fourth control module generates an amplitude phase controlled signal A x R_I (t-tau) according to the control signal Ctrl_3 and the interference cancellation signal R_I (t), and sends the amplitude phase controlled signal A x R_I (t-tau) to the combiner;
the LNA module receives the received signal;
the LNA module performs low-noise amplification on the received signal to generate a superimposed interference signal S & I (t) and sends the superimposed interference signal S & I (t) to the combiner;
the combiner performs superposition cancellation on the amplitude phase controlled signal A_R_I (t-tau) and the superposition interference signal S & I (t), generates a combined output signal S1 (t), and sends the combined output signal S1 (t) to the ADC module;
the ADC module samples the combined output signal S1 (t), generates a digital signal S1 (n), and sends the digital signal S1 (n) to the first control module and the second control module.
In a preferred embodiment, the first control module includes an interference signal feature recognition algorithm module, an analog cancellation algorithm module, and a hybrid cancellation process control algorithm module;
the interference signal characteristic recognition algorithm module performs characteristic analysis on the digital signal S1 (n) to generate an interference signal type, an interference signal frequency f and an interference signal power P_I; the interference signal characteristic recognition algorithm sends the interference signal type, the interference signal frequency f and the interference signal power P_I to a mixed cancellation flow control algorithm module; the interference signal characteristic recognition algorithm sends the interference signal frequency f and the interference signal power P_I to the analog cancellation algorithm module; the type of interference signal includes single/multi-tone interference and non-single/non-multi-tone interference;
the mixed cancellation flow control algorithm module takes the interference signal frequency f and the interference signal power P_I as control signals Ctrl_2, and when the error signal e (n) converges, the control signals Ctrl_2 are sent to a third control module; the hybrid cancellation flow control algorithm module generates a control signal ctrl_1 according to the power error signal e_p and sends the control signal ctrl_1 to the second control module for starting.
The simulation cancellation algorithm module carries out iteration convergence on the interference signal frequency f and the interference signal power P_I to generate an amplitude A and a phase tau, and obtains a power error signal E_P according to the adjacent two iteration interference signal powers P_I; the simulation cancellation algorithm module sends the amplitude A and the phase tau to a fourth control module as control signals Ctrl_3; the simulation cancellation algorithm module sends a power error signal E_P to the hybrid cancellation flow control algorithm module;
in this embodiment, the interference signal feature recognition algorithm performs feature analysis on the input signal, recognizes the type of the interference signal, and informs the result to the hybrid cancellation process control algorithm, which starts the analog cancellation algorithm and the second control module according to the type of the interference signal, and generates control signals ctrl_1 to 3 to control the cancellation process. The simulation cancellation algorithm mainly completes iteration convergence of simulation cancellation and outputs a power error signal E_P of two adjacent iterations to the mixed cancellation flow control algorithm. The functional block diagram of the first control module is shown in fig. 2.
In one preferred embodiment, the second control module is responsible for adaptively filtering the input signal S1 (n), outputting the error signal e (n), the interference estimation signal r_i_w (n) and the final modulus-mixed canceled signal S (n). The functional block diagram of the second control module is shown in fig. 3.
Preferably, the third control module is responsible for interfering signal regeneration. The method comprises the steps of receiving a control signal ctrl_2 of a first control module, generating a single-tone/multi-tone reproduction interference signal or receiving an interference estimation signal R_I_w (n) of a second control module, then adjusting the speed, the size and the phase of the signal, and outputting the signal to a DAC to generate an interference cancellation signal. The functional block diagram of the third control module is shown in fig. 4.
Further, the digital cancellation unit mainly comprises a first control module, a second control module and a third control module. The specific functions are as follows:
1) The first control module is responsible for carrying out interference feature recognition on the input signal; is responsible for generating an analog cancellation algorithm; is responsible for generating a hybrid cancellation flow control algorithm.
2) The second control module is responsible for adaptively filtering the input signal S1 (n), and outputting an error signal e (n), an interference estimation signal r_i_w (n) and a final analog-to-digital mixed and canceled signal S (n). The functional block diagram of the module is shown in fig. 3.
3) And the third control module is responsible for interference signal regeneration. The method comprises the steps of receiving a control signal ctrl_2 of a first control module, generating a single-tone/multi-tone reproduction interference signal or receiving an interference estimation signal R_I_w (n) of a second control module, then adjusting the speed, the size and the phase of the signal, and outputting the signal to a DAC to generate an interference cancellation signal. The functional block diagram is shown in fig. 4.
The invention also provides an anti-interference method for TDD wireless communication, which comprises the following steps:
receiving a superimposed interference signal S & I (t);
performing superposition cancellation on the amplitude phase controlled signal A, R_I (t-tau) and the superposition interference signal S & I (t), and then sampling to obtain a digital signal S1 (n);
performing feature analysis on the digital signal S1 (n) to obtain an analysis result; judging whether the superimposed interference signal is a single-tone/multitone signal or a non-single-tone/non-multitone signal according to the analysis result;
if the superimposed interference signal is a mono/multitone signal, then adaptively filtering the digital signal S1 (n) to obtain an error signal e (n) and an interference estimation signal r_i_w (n); when the error signal e (n) converges, the interference signal frequency f and the interference signal power p_i of the digital signal S1 (n) are regenerated, and the interference estimation signal r_i_w (n) is adjusted, and the interference signal r_i (n) is added;
if the superimposed interference signal is a non-mono/non-multi-tone signal, performing adaptive filtering on the digital signal S1 (n) to obtain an error signal e (n) and an interference estimation signal R_I_w (n); performing rate, magnitude and phase adjustment on the interference estimation signal R_I_w (n) as an interference signal R_I (n);
an amplitude-phase controlled signal a r_i (t- τ) is generated from the amplitude a and the phase τ of the interference signal r_i (n) and the digital signal S1 (n).
Further, the anti-interference method for TDD wireless communication specifically comprises the following steps:
the radio station is in a receiving state, the received superposition interference signal S & I (t) enters a combiner in an analog cancellation unit, and the combiner performs superposition cancellation on the amplitude phase controlled signal A x R_I (t-tau) and the superposition interference signal S & I (t) to generate a combined output signal S1 (t); the fourth control module does not output for the first time, and the combined output signal S1 (t) =S & I (t) of the combiner; the combined output signal S1 (t) is sampled into a digital signal S1 (n) through an ADC module, the digital signal S1 (n) is sent to a first control module and a second control module, and an interference signal characteristic recognition algorithm module of the first control module performs characteristic analysis on the digital signal S1 (n) to obtain an analysis result;
if the analysis result is that the interference signal is a single-tone/multi-tone signal, the interference signal frequency f and the interference signal power P_I of the digital signal S1 (n) are measured, and the interference signal frequency f and the interference signal power P_I are sent to a mixed cancellation flow control algorithm module;
the mixed cancellation flow control algorithm module sends the interference signal frequency f and the interference signal power P_I to the simulation cancellation algorithm module, the simulation cancellation algorithm module carries out iteration convergence on the interference signal frequency f and the interference signal power P_I to generate amplitude A and phase tau, and a power error signal E_P is obtained according to the adjacent two iteration interference signal powers P_I;
the analog cancellation algorithm module sends the amplitude A and the phase tau as control signals Ctrl_3 to the fourth control module for starting;
the analog cancellation algorithm module sends a power error signal E_P to the mixed cancellation flow control algorithm module; the mixed cancellation flow control algorithm module generates a control signal ctrl_1 according to the power error signal e_p and sends the control signal ctrl_1 to the second control module for starting.
The second control module carries out self-adaptive filtering on the digital signal S1 (n) to obtain an error signal e (n), an interference estimation signal R_I_w (n) and a final modulus mixed and canceled signal S (n); the second control module sends an error signal e (n) to a mixed cancellation flow control algorithm module of the first control module, sends an interference estimation signal R_I_w (n) to the third control module, and sends a signal S (n) after final modulus mixed cancellation to the modem module;
the mixed cancellation flow control algorithm module judges whether to send the interference signal frequency f and the interference signal power P_I to the third control module as control signals Ctrl_2 according to the error signal e (n), and if the error signal e (n) converges, the control signals Ctrl_2 are sent to the third control module for starting; at this time, the regeneration signal is estimated and given by the first control module, the third control module adjusts the speed, the size and the phase of the interference signal frequency f and the interference signal power P_I, regenerates the interference estimation signal R_I_w (n), adds the two signals to generate an interference signal R_I (n), and sends the interference signal R_I (n) to the DAC module;
the DAC module performs digital-to-analog signal conversion on the interference signal R_I (n) to generate an interference cancellation signal R_I (t), and sends the interference cancellation signal R_I (t) to the PA module and the fourth control module; the PA module performs power amplification on an interference signal R_I (n) to generate a transmission signal; the fourth control module generates an amplitude phase controlled signal A, R_I (t-tau) according to the control signal Ctrl_3 and the interference cancellation signal R_I (t), and sends the amplitude phase controlled signal A, R_I (t-tau) to the combiner;
if the analysis result is that the interference signal is a non-single-tone/non-multi-tone signal, measuring the interference signal frequency f and the interference signal power P_I of the digital signal S1 (n) at the moment, and sending the interference signal frequency f and the interference signal power P_I to a mixed cancellation flow control algorithm module;
the analog cancellation algorithm module sends the amplitude A and the phase tau as control signals Ctrl_3 to the fourth control module for starting;
the analog cancellation algorithm module sends a power error signal E_P to the mixed cancellation flow control algorithm module; the mixed cancellation flow control algorithm module generates a control signal ctrl_1 according to the power error signal e_p and sends the control signal ctrl_1 to the second control module for starting.
The second control module carries out self-adaptive filtering on the digital signal S1 (n) to obtain an error signal e (n), an interference estimation signal R_I_w (n) and a final modulus mixed and canceled signal S (n); the second control module sends an error signal e (n) to a mixed cancellation flow control algorithm module of the first control module, sends an interference estimation signal R_I_w (n) to the third control module, and sends a signal S (n) after final modulus mixed cancellation to the modem module;
the third control module regenerates the interference estimation signal R_I_w (n), generates an interference signal R_I (n) and sends the interference signal R_I (n) to the DAC module; the DAC module performs digital-to-analog signal conversion on the interference signal R_I (n) to generate an interference cancellation signal R_I (t), and sends the interference cancellation signal R_I (t) to the PA module and the fourth control module; the PA module performs power amplification on an interference signal R_I (n) to generate a transmission signal; the fourth control module generates an amplitude phase controlled signal A, R_I (t-tau) according to the control signal Ctrl_3 and the interference cancellation signal R_I (t), and sends the amplitude phase controlled signal A, R_I (t-tau) to the combiner;
under the control of the mixed interference cancellation flow control algorithm, iteration convergence is finally achieved, and interference suppression is maximized.
An example of design scheme of the anti-interference method and device for TDD wireless communication is given below;
example 1:
the set example known condition elements are as follows:
a) Passband center frequency fc:70MHz;
b) Bandwidth BW:5.2MHz;
c) Signal rate: 7.68Mbps;
d) Modulation scheme: QPSK;
e) Single tone interfering signal frequency: 70MHz;
f)、C/I:-14dB。
the first step: and (5) identifying the characteristics of the interference signals. And analyzing the signal to obtain the signal frequency power meter. And starting an interference signal characteristic recognition algorithm to obtain the interference signal with the type of single tone, the frequency of 70MHz and the size of 9.943dBm. As shown in fig. 6;
frequency of 69.985 69.989 69.992 69.996 70 70.004 70.007 70.011 70.015
Power of -30.53 -35.275 -35.741 -31.921 9.943 -29.709 -34.319 -29.845 -38.855
And secondly, starting a third control module to generate a cancellation signal with the signal frequency of 70MHz and the power of 10dBm. As shown in fig. 7;
spectral line number Frequency (MHz) Power (dBm) Phase (degree)
1 70 10 0
And thirdly, performing iteration cancellation. The first control module starts an analog cancellation algorithm to control the fourth control module to adjust the amplitude phase of the cancellation signal. The power error signal e_p is obtained. As shown in fig. 8;
number of iterations 0 1 2 n
E_P(dBm) 10 12.995 -2.296 -44.407 -44.3
And fourthly, judging cancellation convergence. When Δe_p approaches 0, convergence is determined.
Number of iterations 0 1 2 n
ΔE_P(dBm) 10 2.995 15.291 -0.1 -0.001
And fifthly, starting a second control module to perform digital cancellation. And judging the digital cancellation convergence. As shown in fig. 9;
number of iterations 0 1 2 n
Δe(n) 1.3 1.5 0.2 -0.1 -0.002
And sixthly, obtaining signals after cancellation convergence. As shown in fig. 10.
In the several embodiments provided by the present invention, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and the division of modules, or units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units, modules, or components may be combined or integrated into another apparatus, or some features may be omitted, or not performed.
The units may or may not be physically separate, and the components shown as units may be one physical unit or a plurality of physical units, may be located in one place, or may be distributed in a plurality of different places. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
In particular, according to embodiments of the present disclosure, the processes described above with reference to flowcharts may be implemented as computer software programs. For example, embodiments of the present disclosure include a computer program product comprising a computer program embodied on a computer readable medium, the computer program comprising program code for performing the method shown in the flowcharts. In such embodiments, the computer program may be downloaded and installed from a network via a communication portion, and/or installed from a removable medium. The above-described functions defined in the method of the present invention are performed when the computer program is executed by a Central Processing Unit (CPU). The computer readable medium of the present invention may be a computer readable signal medium or a computer readable storage medium, or any combination of the two. The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above.
The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
The foregoing is merely illustrative of specific embodiments of the present invention, and the scope of the present invention is not limited thereto, but any changes or substitutions within the technical scope of the present invention should be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (5)

1. An anti-interference method for TDD wireless communication, comprising the following steps:
receiving a superimposed interference signal S & I (t);
the method comprises the steps of performing superposition cancellation on an amplitude phase controlled signal A_R_I (t-tau) and a superposition interference signal S & I (t) through a combiner to generate a combined output signal S1 (t);
the combined output signal S1 (t) is sampled into a digital signal S1 (n) through an ADC module;
performing feature analysis on the digital signal S1 (n) to obtain an analysis result; judging whether the superimposed interference signal is a single-tone/multitone signal or a non-single-tone/non-multitone signal according to the analysis result;
if the superimposed interference signal is a mono/multitone signal, the interference signal frequency f and the interference signal power p_i of the digital signal S1 (n) are measured; iteratively converging the interference signal frequency f and the interference signal power P_I of the digital signal S1 (n) to generate the amplitude A and the phase tau of the digital signal S1 (n), and obtaining a power error signal E_P according to the adjacent two iterative interference signal powers P_I; according to the power error signal E_P, performing adaptive filtering on the digital signal S1 (n) to obtain an error signal E (n) and an interference estimation signal R_I_w (n); when the error signal e (n) converges, the interference signal frequency f and the interference signal power P_I of the digital signal S1 (n) are regenerated to obtain a regenerated signal, and the interference estimation signal R_I_w (n) is subjected to speed, size and phase adjustment to obtain an adjustment signal, and the regenerated signal and the adjustment signal are added to form an interference signal R_I (n);
if the superimposed interference signal is a non-mono/non-multi-tone signal, the interference signal frequency f and the interference signal power p_i of the digital signal S1 (n) are measured; iteratively converging the interference signal frequency f and the interference signal power P_I of the digital signal S1 (n) to generate the amplitude A and the phase tau of the digital signal S1 (n), and obtaining a power error signal E_P according to the adjacent two iterative interference signal powers P_I; according to the power error signal E_P, performing adaptive filtering on the digital signal S1 (n) to obtain an interference estimation signal R_I_w (n); performing rate, magnitude and phase adjustment on the interference estimation signal R_I_w (n) as an interference signal R_I (n);
from the interference signal r_i (n) and the digital signal S1 (n), an amplitude phase controlled signal a_r_i (t- τ) is generated.
2. The method for anti-interference TDD wireless communication according to claim 1, wherein an amplitude phase controlled signal a_r_i (t- τ) is generated from an interference signal r_i (n) and a digital signal S1 (n); the method specifically comprises the following steps:
performing digital-to-analog signal conversion on the interference signal R_I (n) to generate an interference cancellation signal R_I (t);
and generating an amplitude-phase controlled signal A, R_I (t-tau) according to the interference cancellation signal R_I (t), the amplitude A and the phase tau of the digital signal S1 (n), and sending the amplitude-phase controlled signal A, R_I (t-tau) to a combiner.
3. The method for anti-interference for TDD wireless communication according to claim 1, wherein:
the digital signal S1 (n) is subjected to feature analysis through an interference signal feature recognition algorithm, and an analysis result, an interference signal frequency f and an interference signal power P_I are generated.
4. The method for anti-interference for TDD wireless communication according to claim 1, wherein:
the interference signal frequency f and the interference signal power P_I are subjected to iterative convergence through an analog cancellation algorithm to generate an amplitude A and a phase tau, and a power error signal E_P is obtained according to the adjacent two iterative interference signal powers P_I.
5. A TDD wireless communication anti-interference device for implementing the anti-interference method for TDD wireless communication according to any one of claims 1 to 4, comprising:
a combiner for performing superposition cancellation on the amplitude phase controlled signal a_r_i (t- τ) and the superposition interfering signal S & I (t);
the ADC module is used for sampling to obtain a digital signal S1 (n);
the first control module is used for carrying out characteristic analysis on the digital signal S1 (n) to obtain an analysis result; the analysis result includes that the superimposed interference signal is a single-tone/multi-tone signal or that the superimposed interference signal is a non-single-tone/non-multi-tone signal;
the second control module is used for carrying out self-adaptive filtering on the digital signal S1 (n) to obtain an error signal e (n) and an interference estimation signal R_I_w (n);
a third control module for generating an interference signal r_i (n) for an interference signal frequency f and an interference signal power p_i according to the interference estimation signal r_i_w (n) and the digital signal S1 (n);
the fourth control module is used for generating an amplitude phase controlled signal A, R_I (t-tau) according to the interference signal R_I (n) and the digital signal S1 (n).
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CN111585594A (en) * 2020-03-27 2020-08-25 中国人民解放军海军工程大学 Interference cancellation device and method based on cascade digital control method
CN113067150A (en) * 2021-03-31 2021-07-02 北京北木波谱科技有限公司 Anti-interference antenna and control method for anti-interference antenna

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018233834A1 (en) * 2017-06-22 2018-12-27 Telefonaktiebolaget Lm Ericsson (Publ) Interference mitigation control
CN110120826A (en) * 2019-04-22 2019-08-13 长沙翼盾电子科技有限公司 A kind of interference parameter estimation offsets the anti-interference method with STAP cascade processing
CN111585594A (en) * 2020-03-27 2020-08-25 中国人民解放军海军工程大学 Interference cancellation device and method based on cascade digital control method
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