CN116112324A - Simultaneous same-frequency self-interference receiving and transmitting combined suppression method - Google Patents
Simultaneous same-frequency self-interference receiving and transmitting combined suppression method Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03821—Inter-carrier interference cancellation [ICI]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03178—Arrangements involving sequence estimation techniques
- H04L25/03248—Arrangements for operating in conjunction with other apparatus
- H04L25/0328—Arrangements for operating in conjunction with other apparatus with interference cancellation circuitry
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention discloses a simultaneous same-frequency self-interference receiving and transmitting combined suppression method, which comprises the following steps: s1, a transmitter mixes a useful signal and a self-interference signal according to a power distribution factor, and then digital-to-analog conversion and radio frequency modulation are carried out on the mixed signal and then the mixed signal is sent to a receiver; s2, authorizing the receiver to receive signals, performing analog-to-digital conversion and time-frequency synchronization on the received signals to obtain synchronous signals, and performing channel coefficient estimation; s3, reconstructing a self-interference signal by using the channel coefficient, and compensating the influence of a channel estimation error on interference reconstruction; s4, subtracting the compensated reconstructed self-interference signal from the synchronous received signal to obtain an interference offset signal, and completing self-interference receiving and transmitting combined suppression. The invention reduces the influence of channel estimation errors on self-interference cancellation by carrying out power distribution at a transmitter and introducing cancellation factors at a receiver.
Description
Technical Field
The invention belongs to the field of wireless communication physical layer safety, and particularly relates to a simultaneous same-frequency self-interference transceiving combined suppression method.
Background
With the development of communication technology, wireless networks bring great convenience to people's life, and meanwhile, wireless communication has a non-negligible potential safety hazard. Due to the broadcast nature of wireless communications, any node may receive signals within reception range in free space. Thus, information may be compromised by eavesdropping by third parties in the wireless propagation. With the expansion of the size of users and the advent of supercomputers, traditional encryption transmission methods based on computational complexity are subject to increasing challenges.
Physical layer security is complementary to upper layer security techniques, which essentially improves channel quality between legitimate users while deteriorating the channel environment of an eavesdropper. Self-interference is an effective physical layer security technique, essentially transmitting a useful signal while sacrificing part of the transmission rate to transmit the self-interference signal to enhance the interference to an eavesdropper.
Since cancellation of self-interference at the licensed receiver end is not always perfect, residual interference at the licensed receiver due to non-ideal factors is aimed at.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a simultaneous co-frequency self-interference receiving and transmitting combined suppression method.
The aim of the invention is realized by the following technical scheme: a simultaneous same-frequency self-interference receiving and transmitting combined suppression method comprises the following steps:
s1, a transmitter mixes a useful signal and a self-interference signal according to a power distribution factor, and then digital-to-analog conversion and radio frequency modulation are carried out on the mixed signal and then the mixed signal is sent to a receiver;
s2, authorizing the receiver to receive signals, performing analog-to-digital conversion and time-frequency synchronization on the received signals to obtain synchronous signals, and performing channel coefficient estimation;
s3, reconstructing a self-interference signal by using the channel coefficient, and compensating the influence of a channel estimation error on interference reconstruction;
s4, subtracting the compensated reconstructed self-interference signal from the synchronous received signal to obtain an interference offset signal, and completing self-interference receiving and transmitting combined suppression.
The beneficial effects of the invention are as follows: the invention reduces the influence of channel estimation errors on self-interference cancellation by carrying out power distribution at the transmitter and introducing cancellation factors at the receiver.
Drawings
FIG. 1 is a schematic diagram of the transmit-receive combined suppression principle of the present invention;
FIG. 2 is a flow chart of the method of the present invention;
fig. 3 is a diagram of self-interference transmit-receive joint suppression performance in an embodiment.
Detailed Description
The technical solution of the present invention will be described in further detail with reference to the accompanying drawings, but the scope of the present invention is not limited to the following description.
As shown in fig. 1-2, a simultaneous co-frequency self-interference transceiving combined suppression method comprises the following steps:
s1, a transmitter mixes a useful signal and a self-interference signal according to a power distribution factor, and then digital-to-analog conversion and radio frequency modulation are carried out on the mixed signal and then the mixed signal is sent to a receiver;
s101, a transmitter mixes a useful signal and a self-interference signal according to a power distribution factor to obtain a mixed signal y (n):
y(n)＝s(n)+j(n)；
wherein the useful signal is s (n), and the self-interference signal is j (n); the sum of the powers of the useful signal and the self-interference signal is P, and satisfies:
alpha represents a power division factor at the time of mixing;
s102, the transmitter carries out digital-to-analog conversion on the mixed signal y (n) and obtains a transmitting signal after radio frequency modulation
And transmitting:
wherein ft Is the carrier frequency.
S2, authorizing the receiver to receive signals, performing analog-to-digital conversion and time-frequency synchronization on the received signals to obtain synchronous signals, and performing channel coefficient estimation;
s201, setting a signal received by an authorized receiver
The method comprises the following steps:
wherein 
Is Gaussian white noise, τ r Is propagation delay;
assuming perfect time-frequency synchronization, the synchronization signal y is after analog-to-digital conversion and time-frequency synchronization s (n) is:
s202, setting the channel estimation length as L symbols, and converting the self-interference signal into a vector form j [ k ]:
j[k]＝[j(0) j(1)…j(kL+L-1)],k＝0,1,2…
similarly, y is s (n) conversion to vector form y [ k ]]：
y[k]＝[y s (0) y s (1)…y s (kL+L-1)],k＝0,1,2…
The estimated value of the channel coefficient is:
s3, reconstructing a self-interference signal by using the channel coefficient, and compensating the influence of a channel estimation error on interference reconstruction;
s301, reconstructing a self-interference signal by using an estimated value of a channel coefficient
S302, multiplying the reconstructed self-interference signal by a cancellation factor lambda to compensate the influence of channel estimation errors on interference reconstruction:
s4, subtracting the compensated reconstructed self-interference signal from the synchronous received signal to obtain an interference offset signal, and completing self-interference receiving and transmitting combined suppression.
Subtracting the compensated reconstructed self-interference signal from the synchronized received signal to obtain an interference-cancelled signal d c (n)：
In the embodiment of the application, the power allocation factor and cancellation factor that maximize the achievable privacy rate are determined in the following manner:
in the embodiment of the present application, assuming that the eavesdropper and the authorized receiver have the same noise power, the achievable privacy rate is:
wherein ：
solving alpha on the principle of maximizing the achievable privacy rate, namely:
the alpha optimal solution is obtained as follows:
similarly, λ is solved on the principle of maximizing the achievable privacy rate, namely:
wherein ：
the lambda optimal solution is obtained as follows:
the optimal solutions for combining α and λ are:
in embodiments of the present application, simulation analysis and evaluation are performed on the symbiotic interference suppression algorithm in the proposed spectrum symbiotic system. Specific parameter settings are shown in the following table.
TABLE 1 simulation parameter set for self-interference transmit-receive combined suppression algorithm
Figure 3 shows the combined effect of different power allocation weights and cancellation factors on the achievable privacy rate. As can be seen from fig. 3, the achievable privacy rate curve has a sharp bump where the achievable privacy rate takes a maximum. At this time, the optimal normalized self-interference power is 0.6, and the cancellation factor λ=0.95. According to the simulation parameter calculation, the optimal power allocation weight alpha=1.345, namely the optimal normalized self-interference power is 0.574, can be obtained, and is matched with the simulation result. It follows that the joint suppression scheme is reliable.
While the foregoing description illustrates and describes a preferred embodiment of the present invention, it is to be understood that the invention is not limited to the form disclosed herein, but is not to be construed as limited to other embodiments, but is capable of use in various other combinations, modifications and environments and is capable of changes or modifications within the spirit of the invention described herein, either as a result of the foregoing teachings or as a result of the knowledge or skill of the relevant art. And that modifications and variations which do not depart from the spirit and scope of the invention are intended to be within the scope of the appended claims.
Claims (5)
1. A simultaneous same-frequency self-interference receiving and transmitting combined suppression method is characterized by comprising the following steps of: the method comprises the following steps:
s1, a transmitter mixes a useful signal and a self-interference signal according to a power distribution factor, and then digital-to-analog conversion and radio frequency modulation are carried out on the mixed signal and then the mixed signal is sent to a receiver;
s2, authorizing the receiver to receive signals, performing analog-to-digital conversion and time-frequency synchronization on the received signals to obtain synchronous signals, and performing channel coefficient estimation;
s3, reconstructing a self-interference signal by using the channel coefficient, and compensating the influence of a channel estimation error on interference reconstruction;
s4, subtracting the compensated reconstructed self-interference signal from the synchronous received signal to obtain an interference offset signal, and completing self-interference receiving and transmitting combined suppression.
2. The method for simultaneous co-frequency self-interference transmit-receive joint suppression according to claim 1, wherein the method comprises the following steps: the step S1 includes:
s101, a transmitter mixes a useful signal and a self-interference signal according to a power distribution factor to obtain a mixed signal y (n):
y(n)＝s(n)+j(n)；
wherein the useful signal is s (n), and the self-interference signal is j (n); the sum of the powers of the useful signal and the self-interference signal is P, and satisfies:
alpha represents a power division factor at the time of mixing;
s102, the transmitter carries out digital-to-analog conversion on the mixed signal y (n) and obtains a transmitting signal after radio frequency modulation
And transmitting:
wherein ft Is the carrier frequency.
3. The method for simultaneous co-frequency self-interference transmit-receive joint suppression according to claim 1, wherein the method comprises the following steps: the step S2 includes:
s201, setting a signal received by an authorized receiver
The method comprises the following steps:
wherein 
Is Gaussian white noise, τ r Is propagation delay;
assuming perfect time-frequency synchronization, the synchronization signal y is after analog-to-digital conversion and time-frequency synchronization s (n) is:
s202, setting the channel estimation length as L symbols, and converting the self-interference signal into a vector form j [ k ]:
j[k]＝[j(0) j(1)…j(kL+L-1)],k＝0,1,2…
similarly, y is s (n) conversion to vector form y [ k ]]：
y[k]＝[y s (0) y s (1)…y s (kL+L-1)],k＝0,1,2…
The estimated value of the channel coefficient is:
wherein ,
variance of the self-interference signal.
4. The method for simultaneous co-frequency self-interference transmit-receive joint suppression according to claim 1, wherein the method comprises the following steps: the step S3 includes:
s301, reconstructing a self-interference signal by using an estimated value of a channel coefficient
S302, multiplying the reconstructed self-interference signal by a cancellation factor lambda to compensate the influence of channel estimation errors on interference reconstruction:
5. the method for simultaneous co-frequency self-interference transmit-receive joint suppression according to claim 1, wherein the method comprises the following steps: the step S4 includes:
subtracting the compensated reconstructed self-interference signal from the synchronized received signal to obtain an interference-cancelled signal d c (n)：
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