CN103427874A - System and method for canceling high-transmission-power same-time same-frequency self-interference under multi-path environment - Google Patents

System and method for canceling high-transmission-power same-time same-frequency self-interference under multi-path environment Download PDF

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CN103427874A
CN103427874A CN2013103952204A CN201310395220A CN103427874A CN 103427874 A CN103427874 A CN 103427874A CN 2013103952204 A CN2013103952204 A CN 2013103952204A CN 201310395220 A CN201310395220 A CN 201310395220A CN 103427874 A CN103427874 A CN 103427874A
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radio frequency
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radio
reconstruction unit
interference
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CN103427874B (en
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沈莹
罗龙
尹洪
潘文生
邵士海
马万治
唐友喜
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University of Electronic Science and Technology of China
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Abstract

The invention discloses a system and method for canceling high-transmission-power same-time same-frequency self-interference under the multi-path environment. The method includes the steps that at the transmitting end, a transmission power control unit is used for controlling radio-frequency signal power of the transmitting end to be a low noise amplifier unsaturated low power value of the receiving end and sending radio-frequency signals of the transmitting end into a radio-frequency interference reestablishing unit I and a radio-frequency interference reestablishing unit II; at the receiving end, and radio-frequency signals output by an antenna unit and the signals processed by the radio-frequency interference reestablishing unit I are subtracted to complete cancellation of radio-frequency self-interference for the first time; then the radio-frequency signal power of the transmitting end is controlled to be a high-power value, and at the receiving end, after the signals enabling the radio-frequency self-interference to be canceled for the first time are amplified by a low noise amplifier, the signals and the signals processed by the radio-frequency interference reestablishing unit II are subtracted to complete cancellation of radio-frequency self-interference for the second time. The system and method for canceling the high-transmission-power same-time same-frequency self-interference under the multi-path environment are suitable for a same-time same-frequency system, improve canceling capacity of high-transmission-power radio-frequency self-interference signals, improve communication stability, and double the spectrum utilization rate.

Description

Under multi-path environment, large transmitting power is simultaneously with frequency self-interference cancellation system and method
Technical field
The present invention relates in wireless communication field remove the system and method disturbed, particularly relate to same self-interference cancellation system and method frequently of large transmitting power while under multi-path environment.
Background technology
The duplex mode commonly used that current wireless communication system carries out two-way communication is divided into two kinds: the one, and time division duplex, the 2nd, Frequency Division Duplexing (FDD) mode.For tdd systems, it adopts same frequency, different time-gap transmission data; For frequency division duplex system, it uses identical time slot, different frequency transmission data.Although these two kinds of traditional duplex modes have been isolated the interference between uplink downlink, they have sacrificed respectively time resource and frequency resource, have reduced the availability of frequency spectrum.
Wireless Telecom Equipment transmitting terminal and receiving terminal adopt the working method of co-channel full duplex simultaneously, by the full duplex technology of same time, same frequency, carry out emission and the reception of signal, the inevitable spectrum efficiency that greatly promotes.But, adopt the working method of co-channel full duplex simultaneously, can cause transmitting terminal radiofrequency signal receiving end to receive, form the radio frequency self-interference signal, and this signal in the signal strength signal intensity of receiving terminal the signal strength signal intensity at receiving terminal much larger than far-end Wireless Telecom Equipment signal, cause normal communication to be had a strong impact on, even may interrupt and damage the receiving terminal headend equipment fully.
Therefore, under the co-channel full duplex mode, radio frequency self-interference cancellation technology is most important simultaneously, and relevant interference cancellation method has also appearred in the prior art field.
As Chinese Patent Application No. 200610113054.4 discloses a kind of interference elimination method that is applicable to co-frequency co-time slot duplexing.This patent has mainly been described two kinds of counteracting modes, and the one, at receiving terminal preset signal pretreatment unit, utilize channel simulator to obtain the interference signal channel parameter, recover the interference signal that receiver is received, carry out the interference signal counteracting; The 2nd, lay principle according to a kind of antenna, reduce the impact of transmitter on the receiver direct interference.Yet first method needs system coordination to coordinate, second method complex operation complexity, all be difficult to carry out.
Chinese Patent Application No. 200710162086.8 discloses common station address interference elimination system and method.This patent is mainly by the transmitting of colocation site interference base station, and as interference-cancelled signals, is transferred to and receives base station and adjusted, and the interference signal addition then received with reception antenna is offset.Yet the method is not considered under multi-path environment, in large transmitting power situation, to effective elimination of radio frequency self-interference signal.
To sum up, in current existing radio frequency self-interference cancellation method, lack the research of co-channel full duplex radio frequency self-interference cancellation method simultaneously of large transmitting power under multi-path environment, cause large transmitting power radio frequency self-interference cancellation poor-performing under multi-path environment.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, same self-interference cancellation system and method frequently of large transmitting power while under a kind of multi-path environment is provided, solved the self-interference problem in while co-channel full duplex communication system, in multi-path environment and large transmitting power situation, realize high performance radio frequency self-interference cancellation, the availability of frequency spectrum is double.
The objective of the invention is to be achieved through the following technical solutions: under multi-path environment, large transmitting power is simultaneously with frequency self-interference cancellation system, it comprises antenna element, the base band transmit processing unit, the baseband receiving signals processing unit, the transmitting power control unit, the adjustment algorithm unit, radio frequency interference reconstruction unit I, radio frequency interference reconstruction unit II, adder I and adder II, the output of base band transmit processing unit is connected with the radio-frequency transmissions passage by digital to analog converter DAC I, the output of radio-frequency transmissions passage respectively with the transmitting terminal of antenna element, radio frequency interference reconstruction unit I is connected with the radio-frequency (RF) signal input end of radio frequency interference reconstruction unit II, the output of antenna element receiving terminal is successively by the adder I, low noise amplifier is connected with radio frequency reception channel with the adder II, the output of radio frequency reception channel is connected with the baseband receiving signals processing unit by analog to digital converter ADC, the output of analog to digital converter ADC also is connected with the adjustment algorithm unit, the output of adjustment algorithm unit is connected with the control signal input of radio-frequency transmissions passage by the transmitting power control unit, the adjustment parameter output of adjustment algorithm unit is connected with radio frequency interference reconstruction unit II with radio frequency interference reconstruction unit I respectively by digital to analog converter DAC II, the signal output part of radio frequency interference reconstruction unit I is connected with the adder I, the signal output part of radio frequency interference reconstruction unit II is connected with the adder II.
The base band transmit processing unit is responsible for base band transmit and is processed; The baseband receiving signals processing unit is responsible for the signal after the radio frequency self-interference cancellation is further carried out to base band signal process; The radio-frequency transmissions passage is processed for emission of radio frequency signals, and transmitting power is subject to the control of transmitting power control unit; The adjustment algorithm unit calculates output according to the signal power after the radio frequency self-interference cancellation and adjusts parameter and control radio frequency interference reconstruction unit I and the signal reconstruction of radio frequency interference reconstruction unit II; Antenna element is for transmitting and receiving radiofrequency signal; Radio frequency interference reconstruction unit I and radio frequency interference reconstruction unit II all are responsible for the radiofrequency signal of input is rebuild; Adder I and adder II are for the computing of radio frequency self-interference cancellation.
Described radio frequency interference reconstruction unit I comprises that timing prolongs module 1, amplitude modulation module 1 and phase modulation module 1, and radio frequency interference reconstruction unit II comprises that the multirouting timing prolongs the signal adjustment circuit that module, amplitude modulation module and phase modulation module form.
Described antenna element comprises one or more antenna, the transmitting terminal of described antenna element and receiving terminal common antenna element antenna or the independent antenna element antenna that uses.
Under multi-path environment, with frequency self-interference cancellation method, it comprises the steps: large transmitting power simultaneously
S1: the base band transmit processing unit after Base-Band Processing and digital-to-analogue conversion, is sent into the radio-frequency transmissions passage by multichannel data to be sent;
S2: the transmitting power control unit is controlled the radio-frequency transmissions passage and signal transmission power is adjusted into to the undersaturated low-power value of receiving terminal low noise amplifier, the radio-frequency transmissions passage is according to this performance number, multichannel data to input is processed, and obtains multichannel radiofrequency signal to be sent
Figure BDA0000376755610000021
Wherein,
Figure BDA0000376755610000022
Represent respectively under low transmission power level condition, launch the 1st, the 2nd until M road radiofrequency signal, M is number of transmit antennas;
S3: multichannel radiofrequency signal A1 to be sent sends into respectively transmitting terminal, radio frequency interference reconstruction unit I and the radio frequency interference reconstruction unit II of antenna element;
S4: the antenna element receiving terminal receives electromagnetic wave, and the output multi-channel radiofrequency signal
Figure BDA0000376755610000031
Wherein,
Figure BDA0000376755610000032
Be illustrated under low transmission power level condition, the output of antenna element receiving terminal the 1st, the 2nd until L road radiofrequency signal, L is the reception antenna number; Radiofrequency signal R1 is successively by adder I, low noise amplifier, adder II, radio frequency reception channel and analog to digital converter, send into the adjustment algorithm unit, the offset result minimum power be take as target in the adjustment algorithm unit, obtains radio frequency self-interference signal most powerful path signal under multi-path environment and adjusts Parameter H 1, and deliver to radio frequency interference reconstruction unit I after the digital to analog converter II converts analog signal to;
S5: the transmitting power control unit is controlled radio-frequency transmissions passage signal transmission power and is set to high-power value, and the radio-frequency transmissions passage is exported radiofrequency signal to be sent Wherein
Figure BDA0000376755610000034
Be illustrated respectively in when transmitting power is high-power value, launch the 1st, the 2nd until M road radiofrequency signal;
66: radiofrequency signal A2 to be sent sends into respectively transmitting terminal, radio frequency interference reconstruction unit I and the radio frequency interference reconstruction unit II of antenna element;
S7: under the multi-path environment that radio frequency interference reconstruction unit I obtains according to step S4, radio frequency self-interference signal most powerful path signal is adjusted Parameter H 1, the signal A2 of input is adjusted to the signal after being rebuild
Figure BDA0000376755610000035
And send into the adder I;
S8: the signal reconstructed through radio frequency interference reconstruction unit I Carry out radio frequency self-interference cancellation for the first time with the radiofrequency signal R2 of the output of antenna element receiving terminal now in the adder I, obtain the signal after radio frequency self-interference cancellation for the first time
Figure BDA0000376755610000037
S9: the signal after the radio frequency self-interference cancellation for the first time Enter low noise amplifier and amplify processing, obtain signal R β
S10: signal R βThrough adder II, radio frequency reception channel and analog to digital converter, send into the adjustment algorithm unit, the offset result minimum power be take as target in the adjustment algorithm unit, produces the N road and adjusts Parameter H 2, n, n=1 wherein, 2..., N, this adjustment parameter is the adjustment parameter that under multi-path environment, the radio frequency self-interference signal is removed all the other the N bar multipath signals outside the most powerful path signal, and delivers to radio frequency interference reconstruction unit II after the digital to analog converter II converts analog signal to;
S11: radio frequency interference reconstruction unit II, by the signal A2 of input, is divided into the N road,, the adjustment Parameter H obtained according to step S10 2, n, control respectively N road signal and adjusted, the signal after being rebuild
Figure BDA0000376755610000039
And send into the adder II;
S12: the signal reconstructed through radio frequency interference reconstruction unit II
Figure BDA00003767556100000310
With the signal R after low noise amplifier amplifies processing βCarry out radio frequency self-interference cancellation for the second time in the adder II, obtain the signal after radio frequency self-interference cancellation for the second time
Figure BDA00003767556100000311
S13: the signal after the radio frequency self-interference cancellation for the second time
Figure BDA00003767556100000312
Be sent to the baseband receiving signals processing unit by radio frequency reception channel and analog to digital converter successively, complete the radio frequency self-interference cancellation.
The transmitting terminal of described antenna element and the working frequency range of receiving terminal overlap fully or partially overlap, and transmitting terminal and receiving terminal are worked simultaneously.
Described multichannel radiofrequency signal to be sent is sent into radio frequency interference reconstruction unit I and radio frequency interference reconstruction unit II, after referring to transmitting terminal being input to each road signal coupling two-way of M road radiofrequency signal of antenna element, send into respectively radio frequency interference reconstruction unit I and radio frequency interference reconstruction unit II.
Described radio frequency interference reconstruction unit I is adjusted the M road radiofrequency signal of input, refers to each road in the M road signal of input is divided into to the L road again, then each the road signal in M * L road is carried out to independent time delay adjustment, amplitude adjustment and phase place adjustment.
Described radio frequency interference reconstruction unit II is adjusted the M road radiofrequency signal of input, refer to each the road signal in the radiofrequency signal of M road is divided into to L * N road, obtain M * L * N road signal, and then M * L * each road signal of N road signal is carried out to independent time delay adjustment, amplitude adjustment and phase place adjustment.
Described amplitude adjustment, time delay adjustment, phase place adjustment realize by adjustment algorithm, and described adjustment algorithm is to take the offset result minimum power as target, and time delay, phase place, amplitude are adjusted, and comprises gradient descent algorithm.
The invention has the beneficial effects as follows: the present invention arranges the transmitting power control unit at transmitting terminal, at receiving terminal, radio frequency interference reconstruction unit I and radio frequency interference reconstruction unit II are set, carry out respectively radio frequency self-interference cancellation and radio frequency self-interference cancellation for the first time for the second time in conjunction with adder I and adder II, not only eliminated radio frequency self-interference signal most powerful path signal under multi-path environment, and eliminated all the other the N bar multipath signals except most powerful path, radio frequency self-interference cancellation performance is excellent; In addition, owing to having carried out radio frequency self-interference cancellation for the first time, offset the most powerful path signal of radio frequency self-interference signal under the multi-path environment, after making the transmitting power control unit that the power setting of transmitting terminal radiofrequency signal is high-power value, low noise amplifier can be unsaturated, avoid distorted signals, guaranteed the useful life of low noise amplifier; Moreover, because radio frequency self-interference cancellation for the second time is to carry out after low noise amplifier, make in the rational situation of circuit design, can not consider the noise factor that radio frequency interference reconstruction unit II is introduced.
The accompanying drawing explanation
Fig. 1 is system architecture diagram of the present invention;
A kind of block diagram of realizing that Fig. 2 is antenna element;
The another kind that Fig. 3 is antenna element is realized block diagram;
In figure, 1-transmitting terminal antenna, 2-receiving terminal antenna, 3-dual-mode antenna, 4-circulator.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail, but protection scope of the present invention is not limited to the following stated.
As shown in Figure 1, under multi-path environment, large transmitting power is simultaneously with frequency self-interference cancellation system, it comprises antenna element, the base band transmit processing unit, the baseband receiving signals processing unit, the transmitting power control unit, the adjustment algorithm unit, radio frequency interference reconstruction unit I, radio frequency interference reconstruction unit II, adder I and adder II, the output of base band transmit processing unit is connected with the radio-frequency transmissions passage by digital to analog converter I (DAC I), the output of radio-frequency transmissions passage respectively with the transmitting terminal of antenna element, radio frequency interference reconstruction unit I is connected with the radio-frequency (RF) signal input end of radio frequency interference reconstruction unit II, the output of antenna element receiving terminal is successively by the adder I, low noise amplifier is connected with radio frequency reception channel with the adder II, the output of radio frequency reception channel is connected with the baseband receiving signals processing unit by analog to digital converter (ADC), the output of analog to digital converter (ADC) also is connected with the adjustment algorithm unit, the output of adjustment algorithm unit is connected with the control signal input of radio-frequency transmissions passage by the transmitting power control unit, the adjustment parameter output of adjustment algorithm unit is connected with radio frequency interference reconstruction unit II with radio frequency interference reconstruction unit I respectively by digital to analog converter II (DAC II), the signal output part of radio frequency interference reconstruction unit I is connected with the adder I, the signal output part of radio frequency interference reconstruction unit II is connected with the adder II.
Radio frequency interference reconstruction unit I comprises that timing prolongs module 1, amplitude modulation module 1 and phase modulation module 1, and radio frequency interference reconstruction unit II comprises that the multirouting timing prolongs the signal adjustment circuit that module, amplitude modulation module and phase modulation module form.The adjustment parameter output of adjustment algorithm module prolongs module, amplitude modulation module and phase modulation module with the timing of radio frequency interference reconstruction unit I and radio frequency interference reconstruction unit II respectively by digital to analog converter II (DAC II) and is connected, and controls time delay adjustment, amplitude adjustment and the phase place adjustment to input signal of radio frequency interference reconstruction unit I and radio frequency interference reconstruction unit II.
The base band transmit processing unit is responsible for base band transmit and is processed; The baseband receiving signals processing unit is responsible for the signal after the radio frequency self-interference cancellation is further carried out to base band signal process; The radio-frequency transmissions passage is processed for emission of radio frequency signals, and transmitting power is subject to the control of transmitting power control unit; The adjustment algorithm unit calculates output according to the signal power after the radio frequency self-interference cancellation and adjusts parameter and control radio frequency interference reconstruction unit I and the signal reconstruction of radio frequency interference reconstruction unit II; Antenna element is for transmitting and receiving radiofrequency signal, and the transmitting terminal of antenna element sends electromagnetic wave, and the receiving terminal of antenna element is used for receiving electromagnetic wave; Radio frequency interference reconstruction unit I and radio frequency interference reconstruction unit II all are responsible for the radiofrequency signal of input is carried out to time delay adjustment, amplitude adjustment and phase place adjustment, realize the reconstruction of signal; Adder I and adder II are for the computing of radio frequency self-interference cancellation.
As shown in Figure 2 and Figure 3, antenna element comprises one or more antenna, the transmitting terminal of described antenna element and receiving terminal common transmit-receive antenna 3 or independent transmitting terminal antenna 1 and the receiving terminal antenna 2 of using, and common transmit-receive antenna 3 is realized by circulator 4.As Fig. 2 is that antenna element transmitting terminal and receiving terminal are independently used the structural representation of antenna, as Fig. 3 is that antenna element transmitting terminal and receiving terminal pass through the structural representation of circulator 4 common transmit-receive antennas 3.The transmitting terminal of antenna element and the working frequency range of receiving terminal overlap fully or partially overlap, and transmitting terminal and the receiving terminal of antenna element are worked simultaneously.
Do not lose general, we further describe same self-interference cancellation method frequently of large transmitting power while under multi-path environment by specific embodiment, suppose to adopt the BPSK modulation, transmitting terminal sends N data symbol altogether, the transmitting terminal number of antennas is M=1, the receiving terminal number of antennas is L=1, and under multi-path environment, large transmitting power, simultaneously with frequency self-interference cancellation method, comprises the steps:
S1: the base band transmit processing unit after Base-Band Processing and digital-to-analogue conversion, is sent into the radio-frequency transmissions passage by data to be sent.
S2: the transmitting power control unit is controlled the radio-frequency transmissions passage and signal transmission power is adjusted into to the undersaturated low-power value of receiving terminal low noise amplifier, the radio-frequency transmissions passage is according to this performance number, data to input are processed, and obtain radiofrequency signal a to be sent 1(t), be expressed as:
Wherein, Mean to get real part; E lowIt is the transmitting power of transmitting antenna; T SIt is a data symbol period; G (t) is base band moulding pulse; f cMean RF spot; b 1(i) be the symbol of emission in i symbol duration of transmitting antenna.
S3: radiofrequency signal a to be sent 1(t) send into transmitting terminal, radio frequency interference reconstruction unit I and the radio frequency interference reconstruction unit II of antenna element.
S4: the antenna element receiving terminal receives electromagnetic wave, and output radiofrequency signal r 1(t), be expressed as:
r 1 ( t ) = Σ k = 1 N path α k e jθ k a 1 ( t - τ k ) + n w ;
Wherein, N PathFor sending to the multipath number between reception; α kFor sending to the decay of k paths between reception; θ kFor sending to the skew of k paths between reception; τ kFor sending to the time delay of k paths between reception; n wFor the white Gaussian noise of introducing.
Radiofrequency signal r 1(t) successively by adder I, low noise amplifier (LNA), adder II, radio frequency reception channel and analog to digital converter (ADC), send into the adjustment algorithm unit, the offset result minimum power be take as target in the adjustment algorithm unit, obtains radio frequency self-interference signal most powerful path signal under multi-path environment and adjusts Parameter H 1, specifically comprise delay parameter
Figure BDA0000376755610000064
Range parameter
Figure BDA0000376755610000065
And phase parameter
Figure BDA0000376755610000066
And will adjust Parameter H 1After converting analog signal to, the digital to analog converter II delivers to radio frequency interference reconstruction unit I.
S5: the transmitting power control unit is controlled radio-frequency transmissions passage signal transmission power and is set to high-power value, and the radio-frequency transmissions passage is exported radiofrequency signal a to be sent 2(t), be expressed as:
Figure BDA0000376755610000067
Wherein, E PowerIt is the transmitting power of the high-power value of transmitting antenna.
S6: radiofrequency signal a to be sent 2(t) send into respectively transmitting terminal, radio frequency interference reconstruction unit I and the radio frequency interference reconstruction unit II of antenna element.
S7: the adjustment Parameter H that radio frequency interference reconstruction unit I obtains according to step S4 1, prolong module, amplitude modulation module and phase modulation module by timing, to the signal a of input 2(t) adjusted, specifically comprised time delay adjustment, amplitude adjustment and phase place adjustment, the signal after being rebuild
Figure BDA0000376755610000071
And send into the adder I,
Figure BDA0000376755610000072
Be expressed as:
x ~ 1 ( t ) = α ~ 1 e j θ ~ 1 a 2 ( t - τ ~ 1 ) + n re ;
Wherein,
Figure BDA0000376755610000074
Mean the signal reconstructed;
Figure BDA0000376755610000075
Mean the amplitude adjustment of carrying out;
Figure BDA0000376755610000076
Mean the time delay adjustment of carrying out;
Figure BDA0000376755610000077
Mean the phase place adjustment of carrying out; n ReMean the noise of introducing in radio frequency interference reconstruction unit I process of reconstruction.
S8: the signal reconstructed through radio frequency interference reconstruction unit I
Figure BDA0000376755610000078
Radiofrequency signal r with now antenna element receiving terminal output 2(t) carry out radio frequency self-interference cancellation for the first time in the adder I, wherein,
Figure BDA0000376755610000079
Obtain the signal after radio frequency self-interference cancellation for the first time
Figure BDA00003767556100000710
r ~ 1 ( t ) = r 2 ( t ) - x ~ 1 ( t ) .
S9: the signal after the radio frequency self-interference cancellation for the first time
Figure BDA00003767556100000712
Enter low noise amplifier (LNA) and amplify processing, obtain signal r β(t) gain of, supposing low noise amplifier (LNA) is β, r β(t) can be expressed as:
r β ( t ) = β r 1 ~ ( t ) = β ( Σ k = 1 N path α k e jθ k a 2 ( t - τ k ) - α ~ 1 e jθ 1 ~ a 2 ( t - τ ~ 1 ) ) + β ( n re + n w ) .
S10: signal r β(t) through adder II, radio frequency reception channel and analog to digital converter (ADC), send into the adjustment algorithm unit, the offset result minimum power be take as target in the adjustment algorithm unit, produces the N road and adjusts Parameter H 2, n, n=1 wherein, 2..., N, this adjustment parameter is the adjustment parameter that under multi-path environment, the radio frequency self-interference signal is removed all the other the N bar multipath signals outside the most powerful path signal, specifically comprises delay parameter
Figure BDA00003767556100000714
Range parameter
Figure BDA00003767556100000715
And phase parameter
Figure BDA00003767556100000716
And after converting analog signal to, the digital to analog converter II delivers to radio frequency interference reconstruction unit II.
S11: radio frequency interference reconstruction unit II is by the signal a of input 2(t), be divided into the N road, wherein each road all is expressed as a 2(t) the adjustment Parameter H, obtained according to step S10 2, n, control respectively N road signal and carry out time delay adjustment, amplitude adjustment and phase place adjustment, obtain the signal after the N road is adjusted
Figure BDA00003767556100000717
And send into the adder II, the n road signal indication after adjustment is:
x ~ 2 , n ( t ) = α ~ 2 , n e j θ ~ 2 , n a 2 ( t - τ ~ 2 , n ) + n re ′ , n = 1,2 , . . . N ;
Wherein,
Figure BDA0000376755610000081
Mean the signal of n road signal after adjusting;
Figure BDA0000376755610000082
Mean the amplitude adjustment of carrying out on the n road;
Figure BDA0000376755610000083
Mean the time delay adjustment of carrying out on the n road; Mean the phase place adjustment of carrying out on the n road; n r' eMean the noise of introducing in radio frequency interference reconstruction unit II process of reconstruction.
S12: the signal reconstructed through radio frequency interference reconstruction unit II
Figure BDA0000376755610000085
With the signal r after low noise amplifier (LNA) amplifies processing β(t) carry out radio frequency self-interference cancellation for the second time in the adder II, obtain the signal after radio frequency self-interference cancellation for the second time
Figure BDA0000376755610000086
Be expressed as:
r ~ 2 ( t ) = r β ( t ) - Σ n = 1 N x ~ 2 , n ( t )
= β ( Σ k = 1 N path α k e j θ k a 2 ( t - τ k ) - α ~ 1 e j θ ~ 1 a 2 ( t - τ ~ 1 ) ) + β ( n re + n w ) - Σ n = 1 N { α ~ 2 , n e j θ ~ 2 , n a 2 ( t - τ ~ 2 , n ) + n re ′ } .
S13: the signal after the radio frequency self-interference cancellation for the second time
Figure BDA0000376755610000089
Be sent to the baseband receiving signals processing unit by radio frequency reception channel and analog to digital converter (ADC) successively, complete the radio frequency self-interference cancellation.
In said method, described amplitude adjustment, time delay adjustment, phase place adjustment realize by adjustment algorithm, and described adjustment algorithm is to take the offset result minimum power as target, and time delay, phase place, amplitude are adjusted, and comprises gradient descent algorithm.
When the radiofrequency signal of emission is multichannel (being the M road), M road radiofrequency signal to be sent is sent into radio frequency interference reconstruction unit I and radio frequency interference reconstruction unit II, each the road signal that refers to the M road radiofrequency signal that will be input to antenna element by coupler or power splitter coupling two-way after, send into respectively radio frequency interference reconstruction unit I and radio frequency interference reconstruction unit II.
Radio frequency interference reconstruction unit I is carried out time delay adjustment, amplitude adjustment and phase place adjustment to the M road radiofrequency signal of input, refer to each road in the M road signal of input is divided into to the L road again by coupler or power splitter, then each the road signal in M * L road is carried out to independent time delay adjustment, amplitude adjustment and phase place adjustment, finally the signal after the corresponding adjustment of different emitting radio frequency signals is carried out to addition, making the signal of radio frequency interference reconstruction unit I output is the L road.
Radio frequency interference reconstruction unit II is carried out time delay adjustment, amplitude adjustment and phase place adjustment to the M road radiofrequency signal of input, refer to each the road signal in the radiofrequency signal of M road is divided into to L * N road by coupler or power splitter, obtain M * L * N road signal, and then M * L * each road signal of N road signal is carried out to independent time delay adjustment, amplitude adjustment and phase place adjustment.Finally the signal after the corresponding adjustment of different emitting radio frequency signals is carried out to addition, making the signal of radio frequency interference reconstruction unit II output is the L road.
The adder I is offset and is subtracted each other the radiofrequency signal of the signal after the processing of radio frequency disturbance reconstruction unit I and the output of antenna element receiving terminal, refers to that the L road signal of radio frequency interference reconstruction unit I output carries out corresponding subtracting each other with the L road radiofrequency signal of antenna element receiving terminal output.The signal reconstructed through radio frequency interference reconstruction unit II carries out radio frequency self-interference cancellation for the second time with the signal amplified after processing through low noise amplifier (LNA) in the adder II, refer to the L road signal of radio frequency interference reconstruction unit II output, with the L road signal that amplifies output through low noise amplifier after radio frequency self-interference cancellation for the first time, carry out corresponding subtracting each other.Described subtracting each other by coupler or mixer realized.
Above embodiment is described is only better implementation of the present invention; be to be understood that the present invention is not limited to the disclosed form of this paper; should not regard the eliminating to other embodiment as; all any modifications of doing within the spirit and principles in the present invention, be equal to replacement, improvement etc., all be included in protection scope of the present invention.

Claims (9)

  1. Under multi-path environment large transmitting power simultaneously with self-interference cancellation system frequently, it is characterized in that: it comprises antenna element, the base band transmit processing unit, the baseband receiving signals processing unit, the transmitting power control unit, the adjustment algorithm unit, radio frequency interference reconstruction unit I, radio frequency interference reconstruction unit II, adder I and adder II, the output of base band transmit processing unit is connected with the radio-frequency transmissions passage by digital to analog converter DAC I, the output of radio-frequency transmissions passage respectively with the transmitting terminal of antenna element, radio frequency interference reconstruction unit I is connected with the radio-frequency (RF) signal input end of radio frequency interference reconstruction unit II, the output of antenna element receiving terminal is successively by the adder I, low noise amplifier is connected with radio frequency reception channel with the adder II, the output of radio frequency reception channel is connected with the baseband receiving signals processing unit by analog to digital converter ADC, the output of analog to digital converter ADC also is connected with the adjustment algorithm unit, the output of adjustment algorithm unit is connected with the control signal input of radio-frequency transmissions passage by the transmitting power control unit, the adjustment parameter output of adjustment algorithm unit is connected with radio frequency interference reconstruction unit II with radio frequency interference reconstruction unit I respectively by digital to analog converter DAC II, the signal output part of radio frequency interference reconstruction unit I is connected with the adder I, the signal output part of radio frequency interference reconstruction unit II is connected with the adder II,
    The base band transmit processing unit is responsible for base band transmit and is processed; The baseband receiving signals processing unit is responsible for the signal after the radio frequency self-interference cancellation is further carried out to base band signal process; The radio-frequency transmissions passage is processed for emission of radio frequency signals, and transmitting power is subject to the control of transmitting power control unit; The adjustment algorithm unit calculates output according to the signal power after the radio frequency self-interference cancellation and adjusts parameter and control radio frequency interference reconstruction unit I and the signal reconstruction of radio frequency interference reconstruction unit II; Antenna element is for transmitting and receiving radiofrequency signal; Radio frequency interference reconstruction unit I and radio frequency interference reconstruction unit II all are responsible for the radiofrequency signal of input is rebuild; Adder I and adder II are for the computing of radio frequency self-interference cancellation.
  2. Under multi-path environment according to claim 1 large transmitting power simultaneously with self-interference cancellation system frequently, it is characterized in that: described radio frequency interference reconstruction unit I comprises that timing prolongs module 1, amplitude modulation module 1 and phase modulation module 1, and radio frequency interference reconstruction unit II comprises that the multirouting timing prolongs the signal adjustment circuit that module, amplitude modulation module and phase modulation module form.
  3. Under multi-path environment according to claim 1 large transmitting power simultaneously with self-interference cancellation system frequently, it is characterized in that: described antenna element comprises one or more antenna, the transmitting terminal of described antenna element and receiving terminal common antenna element antenna or the independent antenna element antenna that uses.
  4. 4. under multi-path environment, large transmitting power is simultaneously with frequency self-interference cancellation method, and it is characterized in that: it comprises the steps:
    S1: the base band transmit processing unit after Base-Band Processing and digital-to-analogue conversion, is sent into the radio-frequency transmissions passage by multichannel data to be sent;
    S2: the transmitting power control unit is controlled the radio-frequency transmissions passage and signal transmission power is adjusted into to the undersaturated low-power value of receiving terminal low noise amplifier, the radio-frequency transmissions passage is according to this performance number, multichannel data to input is processed, and obtains multichannel radiofrequency signal to be sent
    Figure FDA0000376755600000011
    Wherein,
    Figure FDA0000376755600000012
    Represent respectively under low transmission power level condition, launch the 1st, the 2nd until M road radiofrequency signal, M is number of transmit antennas;
    S3: multichannel radiofrequency signal A1 to be sent sends into respectively transmitting terminal, radio frequency interference reconstruction unit I and the radio frequency interference reconstruction unit II of antenna element;
    S4: the antenna element receiving terminal receives electromagnetic wave, and the output multi-channel radiofrequency signal
    Figure FDA0000376755600000021
    Wherein,
    Figure FDA0000376755600000022
    Be illustrated under low transmission power level condition, the output of antenna element receiving terminal the 1st, the 2nd until L road radiofrequency signal, L is the reception antenna number; Radiofrequency signal R1 is successively by adder I, low noise amplifier, adder II, radio frequency reception channel and analog to digital converter, send into the adjustment algorithm unit, the offset result minimum power be take as target in the adjustment algorithm unit, obtains radio frequency self-interference signal most powerful path signal under multi-path environment and adjusts Parameter H 1, and deliver to radio frequency interference reconstruction unit I after the digital to analog converter II converts analog signal to;
    S5: the transmitting power control unit is controlled radio-frequency transmissions passage signal transmission power and is set to high-power value, and the radio-frequency transmissions passage is exported radiofrequency signal to be sent
    Figure FDA00003767556000000211
    Wherein
    Figure FDA0000376755600000023
    Be illustrated respectively in when transmitting power is high-power value, launch the 1st, the 2nd until M road radiofrequency signal;
    S6: radiofrequency signal A2 to be sent sends into respectively transmitting terminal, radio frequency interference reconstruction unit I and the radio frequency interference reconstruction unit II of antenna element;
    S7: under the multi-path environment that radio frequency interference reconstruction unit I obtains according to step S4, radio frequency self-interference signal most powerful path signal is adjusted Parameter H 1, the signal A2 of input is adjusted to the signal after being rebuild
    Figure FDA0000376755600000024
    And send into the adder I;
    S8: the signal reconstructed through radio frequency interference reconstruction unit I
    Figure FDA0000376755600000025
    Carry out radio frequency self-interference cancellation for the first time with the radiofrequency signal R2 of the output of antenna element receiving terminal now in the adder I, obtain the signal after radio frequency self-interference cancellation for the first time
    Figure FDA0000376755600000026
    S9: the signal after the radio frequency self-interference cancellation for the first time
    Figure FDA0000376755600000027
    Enter low noise amplifier and amplify processing, obtain signal R β
    S10: signal R βThrough adder II, radio frequency reception channel and analog to digital converter, send into the adjustment algorithm unit, the offset result minimum power be take as target in the adjustment algorithm unit, produces the N road and adjusts Parameter H 2, n, n=1 wherein, 2..., N, this adjustment parameter is the adjustment parameter that under multi-path environment, the radio frequency self-interference signal is removed all the other the N bar multipath signals outside the most powerful path signal, and delivers to radio frequency interference reconstruction unit II after the digital to analog converter II converts analog signal to;
    S11: radio frequency interference reconstruction unit II, by the signal A2 of input, is divided into the N road, the adjustment Parameter H obtained according to step S10 2, n, control respectively N road signal and adjusted, the signal after being rebuild
    Figure FDA0000376755600000028
    And send into the adder II;
    S12: the signal reconstructed through radio frequency interference reconstruction unit II
    Figure FDA0000376755600000029
    With the signal R after low noise amplifier amplifies processing βCarry out radio frequency self-interference cancellation for the second time in the adder II, obtain the signal after radio frequency self-interference cancellation for the second time
    Figure FDA00003767556000000210
    S13: the signal after the radio frequency self-interference cancellation for the second time
    Figure FDA0000376755600000031
    Be sent to the baseband receiving signals processing unit by radio frequency reception channel and analog to digital converter successively, complete the radio frequency self-interference cancellation.
  5. 5. under multi-path environment according to claim 4, large transmitting power is simultaneously with self-interference cancellation method frequently, and it is characterized in that: the transmitting terminal of described antenna element and the working frequency range of receiving terminal overlap fully or partially overlap, and transmitting terminal and receiving terminal are worked simultaneously.
  6. Under multi-path environment according to claim 4 large transmitting power simultaneously with self-interference cancellation method frequently, it is characterized in that: described multichannel radiofrequency signal to be sent is sent into radio frequency interference reconstruction unit I and radio frequency interference reconstruction unit II, after referring to that each road signal coupling that transmitting terminal is input to the M road radiofrequency signal of antenna element becomes two-way, send into respectively radio frequency interference reconstruction unit I and radio frequency interference reconstruction unit II.
  7. Under multi-path environment according to claim 4 large transmitting power simultaneously with self-interference cancellation method frequently, it is characterized in that: described radio frequency interference reconstruction unit I is adjusted the M road radiofrequency signal of input, refer to each road in the M road signal of input is divided into to the L road again, then each the road signal in M * L road is carried out to independent time delay adjustment, amplitude adjustment and phase place adjustment.
  8. Under multi-path environment according to claim 4 large transmitting power simultaneously with self-interference cancellation method frequently, it is characterized in that: described radio frequency interference reconstruction unit II is adjusted the M road radiofrequency signal of input, refer to each the road signal in the radiofrequency signal of M road is divided into to L * N road, obtain M * L * N road signal, and then M * L * each road signal of N road signal is carried out to independent time delay adjustment, amplitude adjustment and phase place adjustment.
  9. 9. according to same self-interference cancellation method frequently of large transmitting power while under claim 7 and 8 described multi-path environments, it is characterized in that: described amplitude adjustment, time delay adjustment, phase place adjustment realize by adjustment algorithm, described adjustment algorithm is to take the offset result minimum power as target, time delay, phase place, amplitude are adjusted, comprised gradient descent algorithm.
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