CN103427874B - 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 PDFInfo
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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
Technical field
The present invention relates in wireless communication field the system and method removing interference, under particularly relating to multi-path environment, large transmitting power is simultaneously with frequency self-interference cancellation system and method.
Background technology
The conventional duplex mode that current wireless communication system carries out two-way communication is divided into two kinds: one to be time division duplex, and two is frequency division duplex 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 isolated the interference between uplink downlink, they have sacrificed time resource and frequency resource respectively, reduce the availability of frequency spectrum.
Wireless Telecom Equipment transmitting terminal and receiving terminal adopt the working method of co-channel full duplex simultaneously, namely use the full duplex technology of same time, same frequency to carry out the launching and receiving of signal, greatly must promote spectrum efficiency.But, adopt the working method of co-channel full duplex simultaneously, transmitting terminal radiofrequency signal receiving end can be caused to receive, form radio frequency self-interference signal, and this signal in the signal strength signal intensity of receiving terminal much larger than the signal strength signal intensity at receiving terminal of remote wireless communications device signal, cause normal communication to be had a strong impact on, even may interrupt completely and damage receiving terminal headend equipment.
Therefore, under co-channel full duplex mode, radio frequency self-interference cancellation technology is most important simultaneously, and relevant interference cancellation method has also appearred in prior art field.
As Chinese Patent Application No. 200610113054.4 discloses a kind of interference elimination method being applicable to co-frequency co-time slot duplexing.This patent essentially describes two kinds of counteracting modes, and one is at receiving terminal preset signal pretreatment unit, utilizes channel simulator to obtain interference signal channel parameter, recovers the interference signal that receiver receives, carry out interference signal counteracting; Two is lay principle according to a kind of antenna, reduces transmitter to the impact of receiver direct interference.But first method needs system coordination to coordinate, second method complex operation is complicated, is all difficult to carry out.
Chinese Patent Application No. 200710162086.8 discloses common station address interference elimination system and method.This patent transmitting mainly by colocation site interference base station, as interference-cancelled signals, be transferred to reception base station and adjust, the interference signal then received with reception antenna is added to be offset.But the method is not considered in a multi-path environment, in large transmitting power situation, effective elimination of radio frequency self-interference signal.
To sum up, in current existing radio frequency self-interference cancellation method, lack the research to the co-channel full duplex radio frequency self-interference cancellation method simultaneously of large transmitting power under multi-path environment, large transmitting power radio frequency self-interference cancellation poor-performing under causing multi-path environment.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, under providing a kind of multi-path environment, large transmitting power is simultaneously with frequency self-interference cancellation system and method, self-interference problem while of solving in co-channel full duplex communication system, at multi-path environment and in large transmitting power situation, realize high performance radio frequency self-interference cancellation, the availability of frequency spectrum is double.
The object of the invention is to be achieved through the following technical solutions: under multi-path environment, large transmitting power is simultaneously with self-interference cancellation system frequently, it comprises antenna element, base band transmit processing unit, baseband receiving signals processing unit, transmitting power control unit, 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 radio frequency transmitting channel by digital to analog converter DAC I, the output of radio frequency transmitting channel 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 adder I, low noise amplifier is connected with radio frequency reception channel with adder II, the output of radio frequency reception channel is connected with baseband receiving signals processing unit by analog to digital converter ADC, the output of analog to digital converter ADC is also connected with adjustment algorithm unit, the output of adjustment algorithm unit is connected with the control signal input of radio frequency transmitting channel by 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 adder I, the signal output part of radio frequency interference reconstruction unit II is connected with adder II.
Base band transmit processing unit is responsible for base band transmit process; Baseband receiving signals processing unit is responsible for the signal after radio frequency self-interference cancellation and is carried out base band signal process further; Radio frequency transmitting channel is used for emission of radio frequency signals process, and transmitting power is by the control of transmitting power control unit; Adjustment algorithm unit calculates according to the signal power after radio frequency self-interference cancellation and exports adjustment parameter and the signal reconstruction controlling radio frequency interference reconstruction unit I and 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 are all responsible for rebuilding the radiofrequency signal of input; Adder I and adder II are for the computing of radio frequency self-interference cancellation.
Described radio frequency interference reconstruction unit I comprises timing and prolongs module 1, amplitude modulation module 1 and phase modulation module 1, and radio frequency interference reconstruction unit II comprises the signal adjustment circuit that multirouting timing prolongs module, amplitude modulation module and phase modulation module composition.
Described antenna element comprises one or more antenna, transmitting terminal and the receiving terminal common antenna element antenna of described antenna element or independently use antenna.
Under multi-path environment, large transmitting power is simultaneously with frequency self-interference cancellation method, and it comprises the steps:
S1: multichannel data to be sent after Base-Band Processing and digital-to-analogue conversion, is sent into radio frequency transmitting channel by base band transmit processing unit;
S2: transmitting power control unit controls the undersaturated low power value that signal transmission power is adjusted to receiving terminal low noise amplifier by radio frequency transmitting channel, radio frequency transmitting channel is according to this performance number, the multichannel data of input is processed, obtains the radiofrequency signal that multichannel is to be sent
wherein,
represent respectively launch under low transmission power level condition the 1st, the 2nd until M road radiofrequency signal, M is number of transmit antennas;
S3: the multichannel radiofrequency signal A1 to be sent transmitting terminal sending into antenna element respectively, radio frequency interference reconstruction unit I and radio frequency interference reconstruction unit II;
S4: antenna element receiving terminal receives electromagnetic wave, and output multi-channel radiofrequency signal
wherein,
represent under low transmission power level condition, antenna element receiving terminal export the 1st, the 2nd until L road radiofrequency signal, L is 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 adjustment algorithm unit, adjustment algorithm unit is with offset result minimum power for target, and under obtaining multi-path environment, radio frequency self-interference signal most powerful path signal adjusts parameter H
1, and convert to after analog signal through digital to analog converter II and deliver to radio frequency interference reconstruction unit I;
S5: transmitting power control unit controls radio frequency transmitting channel and signal transmission power is set to high-power value, and radio frequency transmitting channel exports radiofrequency signal to be sent
wherein
be illustrated respectively in launch when transmitting power is high-power value the 1st, the 2nd until M road radiofrequency signal;
66: the radiofrequency signal A2 to be sent transmitting terminal sending into antenna element respectively, radio frequency interference reconstruction unit I and radio frequency interference reconstruction unit II;
S7: radio frequency self-interference signal most powerful path signal adjustment parameter H under the multi-path environment that radio frequency interference reconstruction unit I obtains according to step S4
1, the signal A2 of input is adjusted, obtains the signal after rebuilding
and send into adder I;
S8: the signal reconstructed through radio frequency interference reconstruction unit I
in adder I, carry out first time radio frequency self-interference cancellation with the radiofrequency signal R2 that now antenna element receiving terminal exports, obtain the signal after first time radio frequency self-interference cancellation
S9: the signal for the first time after radio frequency self-interference cancellation
enter low noise amplifier and carry out amplification process, obtain signal R
β;
S10: signal R
βthrough adder II, radio frequency reception channel and analog to digital converter, send into adjustment algorithm unit, adjustment algorithm unit for target, produces adjustment parameter H in N road with offset result minimum power
2, n, wherein n=1,2..., N, this adjustment parameter is the adjustment parameter of all the other the N bar multipath signals under multi-path environment outside radio frequency self-interference signal removing most powerful path signal, and converts to after analog signal through digital to analog converter II and deliver to radio frequency interference reconstruction unit II;
S11: radio frequency interference reconstruction unit II, by the signal A2 of input, is divided into N road, according to the adjustment parameter H that step S10 obtains
2, n, control N road signal adjusts respectively, obtains the signal after rebuilding
and send into adder II;
S12: the signal reconstructed through radio frequency interference reconstruction unit II
with amplify the signal R after processing through low noise amplifier
βin adder II, carry out second time radio frequency self-interference cancellation, obtain the signal after second time radio frequency self-interference cancellation
S13: the signal after second time radio frequency self-interference cancellation
be sent to baseband receiving signals processing unit by radio frequency reception channel and analog to digital converter successively, complete radio frequency self-interference cancellation.
The transmitting terminal of described antenna element and the working frequency range of receiving terminal overlap completely or partially overlap, and transmitting terminal and receiving terminal work simultaneously.
The radiofrequency signal feeding radio frequency interference reconstruction unit I that described multichannel is to be sent and radio frequency interference reconstruction unit II, after referring to each the road signal coupling two-way of M road radiofrequency signal transmitting terminal being input to antenna element, send into radio frequency interference reconstruction unit I and radio frequency interference reconstruction unit II respectively.
The M road radiofrequency signal of described radio frequency interference reconstruction unit I to input adjusts, and refers to and each road in the M road signal of input is divided into L road again, then carries out independent time delay adjustment, amplitude adjustment and phase place adjustment to each the road signal in M × L road.
The M road radiofrequency signal of described radio frequency interference reconstruction unit II to input adjusts, refer to and each the road signal in the radiofrequency signal of M road is divided into L × N road, obtain M × L × N road signal, and then independent time delay adjustment, amplitude adjustment and phase place adjustment are carried out to M × L × each road signal of N road signal.
Described amplitude adjustment, time delay adjustment, phase place adjustment are realized by adjustment algorithm, and described adjustment algorithm is with offset result minimum power for target, adjusts, comprise gradient descent algorithm to time delay, phase place, amplitude.
The invention has the beneficial effects as follows: the present invention arranges 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, first time radio frequency self-interference cancellation and second time radio frequency self-interference cancellation is carried out respectively in conjunction with adder I and adder II, not only eliminate radio frequency self-interference signal most powerful path signal under multi-path environment, and eliminating 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 first time radio frequency self-interference cancellation, counteract the most powerful path signal of radio frequency self-interference signal under multi-path environment, transmitting power control unit is made to be after high-power value by the power setting of transmitting terminal radiofrequency signal, low noise amplifier can not be saturated, avoid distorted signals, ensure that the useful life of low noise amplifier; Moreover, because second time radio frequency self-interference cancellation carries out after the low noise amplifiers, make, in the rational situation of circuit design, the noise factor that radio frequency interference reconstruction unit II is introduced can not be considered.
Accompanying drawing explanation
Fig. 1 is system architecture diagram of the present invention;
Fig. 2 is that the one of antenna element realizes block diagram;
Fig. 3 is that the another kind of antenna element realizes 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, base band transmit processing unit, baseband receiving signals processing unit, transmitting power control unit, 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 radio frequency transmitting channel by digital to analog converter I (DAC I), the output of radio frequency transmitting channel 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 adder I, low noise amplifier is connected with radio frequency reception channel with adder II, the output of radio frequency reception channel is connected with baseband receiving signals processing unit by analog to digital converter (ADC), the output of analog to digital converter (ADC) is also connected with adjustment algorithm unit, the output of adjustment algorithm unit is connected with the control signal input of radio frequency transmitting channel by 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 adder I, the signal output part of radio frequency interference reconstruction unit II is connected with adder II.
Radio frequency interference reconstruction unit I comprises timing and prolongs module 1, amplitude modulation module 1 and phase modulation module 1, and radio frequency interference reconstruction unit II comprises the signal adjustment circuit that multirouting timing prolongs module, amplitude modulation module and phase modulation module composition.Adjustment algorithm module adjustment parameter output prolongs module with radio frequency interference reconstruction unit I with the timing of radio frequency interference reconstruction unit II respectively by digital to analog converter II (DAC II), amplitude modulation module is connected with phase modulation module, control the time delay adjustment of radio frequency interference reconstruction unit I and radio frequency interference reconstruction unit II pair of input signal, amplitude adjustment and phase place adjustment.
Base band transmit processing unit is responsible for base band transmit process; Baseband receiving signals processing unit is responsible for the signal after radio frequency self-interference cancellation and is carried out base band signal process further; Radio frequency transmitting channel is used for emission of radio frequency signals process, and transmitting power is by the control of transmitting power control unit; Adjustment algorithm unit calculates according to the signal power after radio frequency self-interference cancellation and exports adjustment parameter and the signal reconstruction controlling radio frequency interference reconstruction unit I and 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 are all responsible for carrying out time delay adjustment, amplitude adjustment and phase place adjustment to the radiofrequency signal of input, 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 independently use transmitting terminal antenna 1 and receiving terminal antenna 2, and common transmit-receive antenna 3 is realized by circulator 4.If Fig. 2 is the structural representation that antenna element transmitting terminal and receiving terminal independently use antenna, if Fig. 3 is antenna element transmitting terminal and the receiving terminal structural representation by circulator 4 common transmit-receive antenna 3.The transmitting terminal of antenna element and the working frequency range of receiving terminal overlap completely or partially overlap, and transmitting terminal and the receiving terminal of antenna element work simultaneously.
Do not lose general, under we further describe multi-path environment by specific embodiment, large transmitting power is simultaneously with frequency self-interference cancellation method, suppose to adopt BPSK modulation, transmitting terminal sends N number of data symbol altogether, transmitting terminal number of antennas is M=1, receiving terminal number of antennas is L=1, then under multi-path environment, large transmitting power, simultaneously with frequency self-interference cancellation method, comprises the steps:
S1: data to be sent after Base-Band Processing and digital-to-analogue conversion, are sent into radio frequency transmitting channel by base band transmit processing unit.
S2: transmitting power control unit controls the undersaturated low power value that signal transmission power is adjusted to receiving terminal low noise amplifier by radio frequency transmitting channel, radio frequency transmitting channel is according to this performance number, the data of input are processed, obtains radiofrequency signal a to be sent
1t (), is expressed as:
Wherein,
represent and get real part; E
lowit is the transmitting power of transmitting antenna; T
sit is a data symbol duration; G (t) is the shaping pulse of base band; f
crepresent RF spot; b
1i () is the symbol launched in transmitting antenna i-th symbol duration.
S3: radiofrequency signal a to be sent
1t () sends into the transmitting terminal of antenna element, radio frequency interference reconstruction unit I and radio frequency interference reconstruction unit II.
S4: antenna element receiving terminal receives electromagnetic wave, and exports radiofrequency signal r
1t (), is expressed as:
Wherein, N
pathfor being sent to the multipath number between reception; α
kfor being sent to the decay of kth paths between reception; θ
kfor being sent to the skew of kth paths between reception; τ
kfor being sent to the time delay of kth paths between reception; n
wfor the white Gaussian noise introduced.
Radiofrequency signal r
1t () is successively by adder I, low noise amplifier (LNA), adder II, radio frequency reception channel and analog to digital converter (ADC), send into adjustment algorithm unit, adjustment algorithm unit is with offset result minimum power for target, and under obtaining multi-path environment, radio frequency self-interference signal most powerful path signal adjusts parameter H
1, specifically comprise delay parameter
range parameter
and phase parameter
and will parameter H be adjusted
1convert to after analog signal through digital to analog converter II and deliver to radio frequency interference reconstruction unit I.
S5: transmitting power control unit controls radio frequency transmitting channel and signal transmission power is set to high-power value, and radio frequency transmitting channel exports radiofrequency signal a to be sent
2t (), is expressed as:
Wherein, E
powerit is the transmitting power of the high-power value of transmitting antenna.
S6: radiofrequency signal a to be sent
2t () sends into the transmitting terminal of antenna element, radio frequency interference reconstruction unit I and radio frequency interference reconstruction unit II respectively.
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
2t () adjusts, specifically comprise time delay adjustment, amplitude adjustment and phase place adjustment, obtain the signal after rebuilding
and send into adder I,
be expressed as:
Wherein,
represent the signal reconstructed;
represent the amplitude adjustment carried out;
represent the time delay adjustment carried out;
represent the phase place adjustment carried out; n
rerepresent the noise introduced in radio frequency interference reconstruction unit I process of reconstruction.
S8: the signal reconstructed through radio frequency interference reconstruction unit I
the radiofrequency signal r exported with now antenna element receiving terminal
2t () carries out first time radio frequency self-interference cancellation in adder I, wherein,
obtain the signal after first time radio frequency self-interference cancellation
S9: the signal for the first time after radio frequency self-interference cancellation
enter low noise amplifier (LNA) and carry out amplification process, obtain signal r
βt (), supposes that the gain of low noise amplifier (LNA) is β, then r
βt () can be expressed as:
S10: signal r
βt (), through adder II, radio frequency reception channel and analog to digital converter (ADC), sends into adjustment algorithm unit, adjustment algorithm unit for target, produces adjustment parameter H in N road with offset result minimum power
2, n, wherein n=1,2..., N, this adjustment parameter is the adjustment parameter of all the other the N bar multipath signals under multi-path environment outside radio frequency self-interference signal removing most powerful path signal, specifically comprises delay parameter
range parameter
and phase parameter
and convert to after analog signal through digital to analog converter II and deliver to radio frequency interference reconstruction unit II.
S11: radio frequency interference reconstruction unit II is by the signal a of input
2t (), is divided into N road, wherein each road is all expressed as a
2t (), according to the adjustment parameter H that step S10 obtains
2, n, control N road signal carries out time delay adjustment, amplitude adjustment and phase place adjustment respectively, obtains the signal after the adjustment of N road
and send into adder II, adjustment Hou n-th road signal indication is:
Wherein,
represent the signal of the n-th road signal after adjustment;
represent the amplitude adjustment that the n-th tunnel is carried out;
represent the time delay adjustment that the n-th tunnel is carried out;
represent the phase place adjustment that the n-th tunnel is carried out; n
r'
erepresent the noise introduced in radio frequency interference reconstruction unit II process of reconstruction.
S12: the signal reconstructed through radio frequency interference reconstruction unit II
the signal r after processing is amplified with through low noise amplifier (LNA)
βt () carries out second time radio frequency self-interference cancellation in adder II, obtain the signal after second time radio frequency self-interference cancellation
be expressed as:
S13: the signal after second time radio frequency self-interference cancellation
be sent to baseband receiving signals processing unit by radio frequency reception channel and analog to digital converter (ADC) successively, complete radio frequency self-interference cancellation.
In said method, described amplitude adjustment, time delay adjustment, phase place adjustment are realized by adjustment algorithm, and described adjustment algorithm is with offset result minimum power for target, adjusts, comprise gradient descent algorithm to time delay, phase place, amplitude.
When the radiofrequency signal of launching is multichannel (i.e. M road), the radiofrequency signal feeding radio frequency interference reconstruction unit I that M road is to be sent and radio frequency interference reconstruction unit II, refer to that each road signal of the M road radiofrequency signal by being input to antenna element is by after coupler or power splitter coupling two-way, sends into radio frequency interference reconstruction unit I and radio frequency interference reconstruction unit II respectively.
The M road radiofrequency signal of radio frequency interference reconstruction unit I to input carries out time delay adjustment, amplitude adjustment and phase place adjustment, refer to and often lead up to coupler or the power splitter in the M road signal of input is divided into L road again, then independent time delay adjustment, amplitude adjustment and phase place adjustment are carried out to each the road signal in M × L road, finally be added by the signal after the adjustment of different emitting radio frequency signal correspondence, the signal that radio frequency interference reconstruction unit I is exported is L road.
The M road radiofrequency signal of radio frequency interference reconstruction unit II to input carries out time delay adjustment, amplitude adjustment and phase place adjustment, refer to and each the road signal in the radiofrequency signal of M road is divided into L × N road by coupler or power splitter, obtain M × L × N road signal, and then independent time delay adjustment, amplitude adjustment and phase place adjustment are carried out to M × L × each road signal of N road signal.Finally be added by the signal after the adjustment of different emitting radio frequency signal correspondence, the signal that radio frequency interference reconstruction unit II is exported is L road.
The radiofrequency signal that signal after the process of adder I radio frequency disturbance reconstruction unit I and antenna element receiving terminal export is carried out counteracting and is subtracted each other, and refers to that the L road signal that radio frequency interference reconstruction unit I exports carries out corresponding subtracting each other with the L road radiofrequency signal that antenna element receiving terminal exports.The signal reconstructed through radio frequency interference reconstruction unit II with amplify the signal after processing through low noise amplifier (LNA) in adder II, carry out second time radio frequency self-interference cancellation, refer to the L road signal that radio frequency interference reconstruction unit II exports, and amplify through low noise amplifier the L road signal exported after first time radio frequency self-interference cancellation and carry out corresponding subtracting each other.Described subtracting each other is realized by coupler or mixer.
It is only better implementation of the present invention described in above embodiment; be to be understood that the present invention is not limited to the form disclosed by this paper; should not regard the eliminating to other embodiments as; all any amendments done within the spirit and principles in the present invention, equivalent replacement, improvement etc., be all included in protection scope of the present invention.
Claims (9)
1. large transmitting power same self-interference cancellation system frequently simultaneously under multi-path environment, it is characterized in that: it comprises antenna element, base band transmit processing unit, baseband receiving signals processing unit, transmitting power control unit, 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 radio frequency transmitting channel by digital to analog converter DAC I, the output of radio frequency transmitting channel 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 adder I, low noise amplifier is connected with radio frequency reception channel with adder II, the output of radio frequency reception channel is connected with baseband receiving signals processing unit by analog to digital converter ADC, the output of analog to digital converter ADC is also connected with adjustment algorithm unit, the output of adjustment algorithm unit is connected with the control signal input of radio frequency transmitting channel by 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 adder I, the signal output part of radio frequency interference reconstruction unit II is connected with adder II,
Base band transmit processing unit is responsible for base band transmit process; Baseband receiving signals processing unit is responsible for the signal after radio frequency self-interference cancellation and is carried out base band signal process further; Radio frequency transmitting channel is used for emission of radio frequency signals process, and transmitting power is by the control of transmitting power control unit; Adjustment algorithm unit calculates according to the signal power after radio frequency self-interference cancellation and exports adjustment parameter and the signal reconstruction controlling radio frequency interference reconstruction unit I and 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 are all responsible for rebuilding the radiofrequency signal of input; Adder I and adder II are for the computing of radio frequency self-interference cancellation.
2. large transmitting power same self-interference cancellation system frequently simultaneously under multi-path environment according to claim 1, it is characterized in that: described radio frequency interference reconstruction unit I comprises timing and prolongs module 1, amplitude modulation module 1 and phase modulation module 1, radio frequency interference reconstruction unit II comprises the signal adjustment circuit that multirouting timing prolongs module, amplitude modulation module and phase modulation module composition.
3. large transmitting power same self-interference cancellation system frequently simultaneously under multi-path environment according to claim 1, it is characterized in that: described antenna element comprises one or more antenna, transmitting terminal and the receiving terminal common antenna element antenna of described antenna element or independently use antenna.
4. under multi-path environment, large transmitting power, simultaneously with frequency self-interference cancellation method, is characterized in that: it comprises the steps:
S1: multichannel data to be sent after Base-Band Processing and digital-to-analogue conversion, is sent into radio frequency transmitting channel by base band transmit processing unit;
S2: transmitting power control unit controls the undersaturated low power value that signal transmission power is adjusted to receiving terminal low noise amplifier by radio frequency transmitting channel, radio frequency transmitting channel is according to this performance number, the multichannel data of input is processed, obtains the radiofrequency signal that multichannel is to be sent
wherein,
represent respectively launch under low transmission power level condition the 1st, the 2nd until M road radiofrequency signal, M is number of transmit antennas;
S3: the multichannel radiofrequency signal A1 to be sent transmitting terminal sending into antenna element respectively, radio frequency interference reconstruction unit I and radio frequency interference reconstruction unit II;
S4: antenna element receiving terminal receives electromagnetic wave, and output multi-channel radiofrequency signal
wherein,
represent under low transmission power level condition, antenna element receiving terminal export the 1st, the 2nd until L road radiofrequency signal, L is 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 adjustment algorithm unit, adjustment algorithm unit is with offset result minimum power for target, and under obtaining multi-path environment, radio frequency self-interference signal most powerful path signal adjusts parameter H
1, and convert to after analog signal through digital to analog converter II and deliver to radio frequency interference reconstruction unit I;
S5: transmitting power control unit controls radio frequency transmitting channel and signal transmission power is set to high-power value, and radio frequency transmitting channel exports radiofrequency signal to be sent
wherein
be illustrated respectively in launch when transmitting power is high-power value the 1st, the 2nd until M road radiofrequency signal;
S6: the radiofrequency signal A2 to be sent transmitting terminal sending into antenna element respectively, radio frequency interference reconstruction unit I and radio frequency interference reconstruction unit II;
S7: radio frequency self-interference signal most powerful path signal adjustment parameter H under the multi-path environment that radio frequency interference reconstruction unit I obtains according to step S4
1, the signal A2 of input is adjusted, obtains the signal after rebuilding
and send into adder I;
S8: the signal reconstructed through radio frequency interference reconstruction unit I
in adder I, carry out first time radio frequency self-interference cancellation with the radiofrequency signal R2 that now antenna element receiving terminal exports, obtain the signal after first time radio frequency self-interference cancellation
S9: the signal for the first time after radio frequency self-interference cancellation
enter low noise amplifier and carry out amplification process, obtain signal R
β;
S10: signal R
βthrough adder II, radio frequency reception channel and analog to digital converter, send into adjustment algorithm unit, adjustment algorithm unit for target, produces adjustment parameter H in N road with offset result minimum power
2, n, wherein n=1,2..., N, this adjustment parameter is the adjustment parameter of all the other the N bar multipath signals under multi-path environment outside radio frequency self-interference signal removing most powerful path signal, and converts to after analog signal through digital to analog converter II and deliver to radio frequency interference reconstruction unit II;
S11: radio frequency interference reconstruction unit II, by the signal A2 of input, is divided into N road, according to the adjustment parameter H that step S10 obtains
2, n, control N road signal adjusts respectively, obtains the signal after rebuilding
and send into adder II;
S12: the signal reconstructed through radio frequency interference reconstruction unit II
with amplify the signal R after processing through low noise amplifier
βin adder II, carry out second time radio frequency self-interference cancellation, obtain the signal after second time radio frequency self-interference cancellation
S13: the signal after second time radio frequency self-interference cancellation
be sent to baseband receiving signals processing unit by radio frequency reception channel and analog to digital converter successively, complete radio frequency self-interference cancellation.
5. under multi-path environment according to claim 4, large transmitting power, simultaneously with frequency self-interference cancellation method, is characterized in that: the transmitting terminal of described antenna element and the working frequency range of receiving terminal overlap completely or partially overlap, and transmitting terminal and receiving terminal work simultaneously.
6. large transmitting power same self-interference cancellation method frequently simultaneously under multi-path environment according to claim 4, it is characterized in that: the radiofrequency signal feeding radio frequency interference reconstruction unit I that described multichannel is to be sent and radio frequency interference reconstruction unit II, after referring to that each the road signal coupling of M road radiofrequency signal radio frequency transmitting channel being input to antenna element becomes two-way, send into radio frequency interference reconstruction unit I and radio frequency interference reconstruction unit II respectively.
7. large transmitting power same self-interference cancellation method frequently simultaneously under multi-path environment according to claim 4, it is characterized in that: the M road radiofrequency signal of described radio frequency interference reconstruction unit I to input adjusts, refer to and each road in the M road signal of input is divided into L road again, then independent time delay adjustment, amplitude adjustment and phase place adjustment are carried out to each the road signal in M × L road.
8. large transmitting power same self-interference cancellation method frequently simultaneously under multi-path environment according to claim 4, it is characterized in that: the M road radiofrequency signal of described radio frequency interference reconstruction unit II to input adjusts, refer to and each the road signal in the radiofrequency signal of M road is divided into L × N road, obtain M × L × N road signal, and then independent time delay adjustment, amplitude adjustment and phase place adjustment are carried out to M × L × each road signal of N road signal.
9. under the multi-path environment according to claim 7 or 8, large transmitting power is simultaneously with frequency self-interference cancellation method, it is characterized in that: described amplitude adjustment, time delay adjustment, phase place adjustment are realized by adjustment algorithm, described adjustment algorithm is for target with offset result minimum power, time delay, phase place, amplitude are adjusted, comprises gradient descent algorithm.
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| CN104811213B (en) * | 2014-01-28 | 2018-03-09 | 华为技术有限公司 | Self-interference signal abatement apparatus and method |
| ES2712277T3 (en) | 2014-04-04 | 2019-05-10 | Huawei Tech Co Ltd | Method, device and interference cancellation system of the same frequency |
| CN106256097B (en) * | 2014-04-30 | 2019-06-11 | 华为技术有限公司 | Method for interference cancellation and device |
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| CA2953658C (en) * | 2014-06-26 | 2020-05-12 | Huawei Technologies Co., Ltd. | Interference cancellation apparatus and method |
| WO2015196398A1 (en) * | 2014-06-26 | 2015-12-30 | 华为技术有限公司 | Wireless communication method and system, and full-duplex wireless transceiver |
| CN104935540B (en) * | 2015-05-21 | 2018-12-07 | 电子科技大学 | A kind of co-channel full duplex limit self-interference cancellation method simultaneously |
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