CN103458424B - Based on the self-interference removing method that power detection and loop delay calculate - Google Patents
Based on the self-interference removing method that power detection and loop delay calculate Download PDFInfo
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Abstract
A kind of self-interference removing method calculated based on power detection and loop delay, operating procedure is as follows: (1) measures the channel parameter of self-interference loop: launch one group of training sequence signal, and the time delay using known loop delay algorithm to calculate this self-interference signal to produce after loop transfer, and in digital signal processing circuit, calculate this self-interference signal receive and the changed power launched; (2) self-interference in communication process is eliminated: when starting communication and send data, according to the measurement parameter of step (1) self-interference loop channel generate one group carry out quantizing and postpone to the data-signal of transmitting correspondingly offset signal, recycle this and offset signal, when receiving self-interference signal and arriving digital signal processing circuit, make to offset signal and self-interference signal subtracts each other and eliminate self-interference signal in communication process.Feature of the present invention is that operating procedure is very simple, and algorithm is easy, but the eradicating efficacy of its digital self-interference is fine, is worthy of popularization.
Description
Technical field
The present invention relates to a kind of Digital Signal Processing of communication system, specifically, relate to a kind of self-interference removing method calculated based on power detection and loop delay, belong to the technical field of wireless communication technology.
Background technology
In current wireless communication system, distinguish and have two kinds of patterns: Frequency Division Duplexing (FDD) (FDD) and time division duplex (TDD) with duplex mode, wherein, co-channel full duplex communication is the brand new technical just begun one's study in recent years simultaneously.Its transmitting and receiving use same frequency range, and be the same time carry out transmitting-receiving operation, the availability of frequency spectrum that resource is very in short supply can be doubled, be therefore widely studied.
So-called simultaneously with frequently requiring that this communicator is transmitter, also be receiving equipment, and transmitting antenna and reception antenna are apart from closer, so the signal that itself launches also can be received by the reception antenna of oneself, become " self-interference signal ", only have and eliminate self-interference signal and could receive the signal that remote device sends.Illustrating, take transmitting power as 0dBm, our launching and receiving antenna distance 20cm, far away apart from counterpart transmitter 10m.The self-interference signal that we receive is-20dBm, and what receive is-50dBm to square signal.Require as 16dB is for benchmark with demodulation signal to noise ratio, then at least the self-interference signal of we will be reduced to-66dBm from-20dBm; Namely interference 46dB will be eliminated.Transmitting more at a distance to realize, self-interference signal will be reduced more.
At present, co-channel full duplex communication self-interference technology for eliminating while introducing in some papers, if frequency when eliminating by interference divides, can be divided into radio frequency self-interference to eliminate and the elimination of digital self-interference.
It is before transmitting antenna that radio frequency self-interference is eliminated, and a coupling part transmits, and re-uses some devices and adjusts its phase place and amplitude, then superpose with reception antenna signal, eliminates self-interference signal in radio frequency low-noise amplifier front end.
It is after analog/digital sampling that numeral self-interference is eliminated, and carries out a self-interference again and eliminate in the numeric field of baseband signal.But digital self-interference removing method is different.The data separation using the data adopting coding method we to be sent and the other side to send in some papers at present comes.Show in some papers, its effect eliminating self-interference only has 4 ~ 6dB, illustrates or has a lot of self-interference signals and be received machine reception.
Also have a kind of method using channel estimating in addition: use channel estimating theoretical, channel estimating is carried out to the self-interference signal received, first estimate its situation after spatial, then use sef-adapting filter to eliminate at numeric field.It can reach 20dB in the effect of interference elimination.But the channel estimating used because of it and digital filter scheduling theory or technology, make hard-wired complexity strengthen.
Summary of the invention
In view of this, the object of this invention is to provide a kind of interference elimination method calculated based on power detection and loop delay, the present invention eliminates self-interference signal in the digital signal processing of communication, and the digital interference eradicating efficacy of 26dB can be realized, eliminate the level of 20dB with the method for the use channel estimating introduced in current paper, also will promote 6dB; And the operating procedure of the inventive method is very simple, and complexity is lower, is easy to apply.
In order to achieve the above object, the invention provides a kind of interference elimination method calculated based on power detection and loop delay, it is characterized in that: the data-signal that radio communication device is launched from its digital signal processing circuit, be through that its transmitter circuitry and transmitting antenna send; When this data-signal is received by the reception antenna of the machine, just become self-interference signal; Described interference elimination method eliminates this self-interference signal exactly, comprises following two operating procedures:
(1) channel parameter of self-interference loop is measured: launch one group of training sequence signal, and the time delay using known loop delay algorithm to calculate this self-interference signal to produce after loop transfer, and in digital signal processing circuit, calculate this self-interference signal receive and the changed power launched;
(2) self-interference in communication process is eliminated: when starting communication and send data, according to the measurement parameter of step (1) self-interference loop channel generate one group carry out quantizing and postpone to the data-signal of transmitting correspondingly offset signal, recycle this and offset signal, when receiving self-interference signal and arriving digital signal processing circuit, make to offset signal and self-interference signal subtracts each other and eliminate self-interference signal in communication process.
The feature of the inventive method is: compare can find with other interference elimination methods, the operating procedure of the inventive method is very simple, and algorithm is easy, but the eradicating efficacy of its digital self-interference is fine, the digital interference eradicating efficacy of 26dB can be realized, eliminate the level of 20dB with the method for the use channel estimating introduced in current paper, also will promote 6dB.Therefore be worthy of popularization.
Accompanying drawing explanation
Fig. 1 is the interference elimination method operating process block diagram that the present invention is based on power detection and loop delay calculating.
Fig. 2 is the training sequence receiving and transmitting signal schematic diagram of the inventive method operating procedure 1.
Fig. 3 is the operating procedure flow diagram of Fig. 2.
Fig. 4 is the communication process receiving and transmitting signal schematic diagram of the inventive method operating procedure 2.
Fig. 5 is the operating procedure flow diagram of Fig. 4.
Co-channel full duplex communication scheme while that Fig. 6 being.
Fig. 7 is communication party A receiving and transmitting signal schematic diagram.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with drawings and Examples, the present invention is described in further detail.
See Fig. 1, introduce the interference elimination method that the present invention is based on power detection and loop delay calculating:
As everyone knows, the data-signal that radio communication device is launched from its digital signal processing circuit, is through that its transmitter circuitry and transmitting antenna send; When this data-signal is received by the reception antenna of the machine, just become self-interference signal.Interference elimination method of the present invention eliminates this self-interference signal exactly, and the method comprises following two operating procedures:
Step 1, measure the channel parameter of self-interference loop: launch one group of training sequence signal, and the time delay using known loop delay algorithm to calculate this self-interference signal to produce after loop transfer, and in digital signal processing circuit, calculate this self-interference signal receive and the changed power launched.
See Fig. 2 and Fig. 3, introduce the following content of operation of this step 1:
(11) in the t0 moment, launch one group of training sequence signal with power P 1 from its digital signal processing circuit, this training sequence signal sends from transmitting antenna via transmitter circuitry.
(12) reception antenna receives this training sequence signal, then carries out digital sample through the analog front circuit of receiver to it, and turns back to digital signal processing circuit in the t1 moment; Now, the power calculating this training sequence signal is P2.
(13) use known loop delay estimation algorithm, calculate this training sequence signal is sent to reception loop transfer time delay Δ t=t1-t0 from digital signal processing circuit, and obtain its power ratio
Step 2, eliminate the self-interference in communication process: when starting communication and send data, according to the measurement parameter of step (1) self-interference loop channel generate one group carry out quantizing and postpone to the data-signal of transmitting correspondingly offset signal, recycle this and offset signal, when receiving self-interference signal and arriving digital signal processing circuit, make to offset signal and self-interference signal subtracts each other and eliminate self-interference signal in communication process.
See Fig. 4 and Fig. 5, introduce the following content of operation of this step 2:
(21) radio communication device is from its digital signal processing circuit and the data-signal m that sends via radiating circuit and transmitting antenna, when being received by the reception antenna of the machine via space propagation, becomes self-interference signal.Because it just enters digital signal processing circuit through radio-frequency (RF) receiving circuit and analog to digital conversion circuit again, so time its amplitude can change, and produce propagation delay time.Arranging the self-interference signal now entering digital signal processing circuit is m1.
(22) when transmitted data signal m, in digital signal processing circuit, produce it offsets signal m2 simultaneously, and this power offseting signal m2 is data-signal m's
doubly, namely
(23) in digital signal processing circuit, the operation that two data-signal m1 and m2 subtract each other is performed, i.e. m1-m2; Training sequence is adopted to calculate the power ratio obtained because offset signal m2
be multiplied with data-signal m long-pending, it is substantially identical for namely offseting signal m2 with data-signal m1; And allow this offset the generation time delay Δ t time of signal m2, align with the sequential of self-interference signal m1 to make offseting signal m2, like this, the operating result of m1-m2 is about 0, and namely m1-m2 ≈ 0, namely eliminates self-interference signal.
See Fig. 6 and Fig. 7, introduce the simultaneously co-channel full duplex communication system adopted in one embodiment of the invention.This communication system has communication party A and communication party B, and be respectively equipped with transmitter and receiver, digital interference removing method of the present invention is performed by the receiver B of the receiver A of communication party A and communication party B respectively, each transmitter comprises transmitting antenna, radio frequency transmitter circuitry and D/A converting circuit, and receiver then comprises reception antenna, radio-frequency (RF) receiving circuit, analog to digital conversion circuit; Transmitter and receiver shares a set of digital signal processing circuit.And in communication process, the frequency range of communicating pair is same frequency range, send and Received signal strength simultaneously.
Inventions have been Multi simulation running and implement test, below the communication process of brief description digital interference of the present invention removing method embodiment as follows:
First, carried out the parameter measurement of self-interference loop channel by communication party A, record its power ratio and loop delay.Namely first adopt power to be that p1 launches one group of training sequence signal from digital signal processing circuit in the t0 moment, this sequence signal, after transmitter circuitry, sends from transmitting antenna.This training sequence signal carries out digital sample through receiver analog front circuit, finally gets back to digital signal processing circuit in the t1 moment, now will calculate the performance number p2 of training sequence signal after being received by the reception antenna of we.Re-use known loop delay estimation algorithm, calculate this training sequence signal is issued to reception loop time delay Δ t=t1-t0 from digital signal processing circuit, and obtain both power ratios
Then, carried out the parameter measurement of self-interference loop channel by communication party B, i.e. the above-mentioned steps of repeated communications side A.So far, both sides have measured channel parameter, can start to transmit data.Communication party A sends data to communication party B, and communication party B also sends data to communication party A simultaneously, and the frequency range sending data is also same frequency range.While reception is to square signal, two receivers of communication party A and communication party B all carry out self-interference elimination.Its operating procedure is:
Suppose that the data that communication party A launches are m, the data that communication party B launches are n.Because two groups of data m and n are respectively through air dielectric, antenna and receiving circuit, so setting data n is when arriving the digital signal processing circuit of communication party A, become n1.The self-interference signal simultaneously also setting communication party A to receive is as m1, and signal during what communication party A received enter digital signal processing circuit is the mixed signal of m1+n1.
Communication party A produces one group and offsets signal m2 in digital signal processing circuit, and the performance number of this m2 signal is data m's
doubly, namely
In digital signal processing circuit, perform the operation that two data-signal m1 and m2 subtract each other, i.e. m1-m2.The power ratio that training sequence signal testing obtains is through owing to offseting signal m2
be multiplied with data-signal m long-pending, namely this signal m2 that disappears is similar with data-signal m1 or substantially identical; And the time delay Δ t time, make to offset signal m2 and align with the sequential of self-interference signal m1, so the result that m1-m2 subtracts each other is 0, i.e. m1-m2 ≈ 0, so close road signal just eliminate self-interference signal, become m1+n1-m2 ≈ n1, namely obtain the information n1 of communication party B.
In like manner, communication party B obtains the data message m1 of communication party A after being also through the elimination of above-mentioned self-interference.Thus achieve co-channel full duplex communication simultaneously.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (3)
1. based on the self-interference removing method that power detection and loop delay calculate, it is characterized in that: the data-signal that radio communication device is launched from its digital signal processing circuit, be through that its transmitter circuitry and transmitting antenna send; When this data-signal is received by the reception antenna of the machine, just become self-interference signal; Described interference elimination method eliminates this self-interference signal exactly, comprises following two operating procedures:
(1) channel parameter of self-interference loop is measured: launch one group of training sequence signal, and the time delay using known loop delay algorithm to calculate this self-interference signal to produce after loop transfer, and in digital signal processing circuit, calculate this self-interference signal receive and the changed power launched;
(2) self-interference in communication process is eliminated: when starting communication and send data, according to the measurement parameter of step (1) self-interference loop channel generate one group carry out quantizing and postpone to the data-signal of transmitting correspondingly offset signal, recycle this and offset signal, when receiving self-interference signal and arriving digital signal processing circuit, make to offset signal and self-interference signal subtracts each other and eliminate self-interference signal in communication process.
2. method according to claim 1, is characterized in that, described step (1) comprises following content of operation:
(11) in the t0 moment, launch one group of training sequence signal with power P 1 from its digital signal processing circuit, this training sequence signal sends from transmitting antenna via transmitter circuitry;
(12) reception antenna receives this training sequence signal, and the analog front circuit through receiver carries out digital sample to it, and turns back to digital signal processing circuit in the t1 moment; Now, the power calculating this training sequence signal is P2;
(13) use known loop delay estimation algorithm, calculate this training sequence signal is sent to reception loop time delay Δ t=t1-t0 from digital signal processing circuit, and obtain its power ratio
3. method according to claim 2, is characterized in that, described step (2) comprises following content of operation:
(21) from its digital signal processing circuit and the data-signal m that sends via radiating circuit and transmitting antenna, when this data-signal m is received by the reception antenna of the machine via space propagation, just digital signal processing circuit is entered again through radio-frequency (RF) receiving circuit and analog to digital conversion circuit, now its amplitude changes, therefore sets the self-interference signal that now enters digital signal processing circuit as m1;
(22) when transmitted data signal m, in digital signal processing circuit, produce it offsets signal m2 simultaneously, and this power offseting signal m2 is data-signal m's
doubly, namely
(23) in digital signal processing circuit, the operation that two data-signal m1 and m2 subtract each other is performed, i.e. m1-m2; Training sequence is adopted to calculate the power ratio obtained because offset signal m2
be multiplied with data-signal m long-pending, it is substantially identical for namely offseting signal m2 with data-signal m1; And the time delay Δ t time is wanted in this generation offseting signal m2, align with the sequential of self-interference signal m1 to make offseting signal m2, like this, the operating result of m1-m2 is 0, and namely m1-m2 ≈ 0, namely eliminates self-interference signal.
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| RU2644396C2 (en) * | 2013-11-29 | 2018-02-12 | Хуавэй Текнолоджиз Ко., Лтд. | Device and method for self-interference signal reduction in communication system |
| CN104811971B (en) * | 2014-01-28 | 2018-09-28 | 华为技术有限公司 | The switching method and communication equipment of communication pattern |
| CN105763494B (en) * | 2014-12-18 | 2019-02-15 | 北京科技大学 | A kind of adaptive wireless Full-Duplex Analog self-interference removing method and system |
| CN105099643B (en) * | 2015-08-18 | 2019-03-01 | 北京科技大学 | A kind of method of Full-duplex wireless communications, antenna assembly and system |
| CN106559365B (en) * | 2015-09-30 | 2020-02-14 | 华为技术有限公司 | Self-interference elimination method and equipment |
| CN106953689A (en) * | 2016-01-06 | 2017-07-14 | 中兴通讯股份有限公司 | A kind of reliability of communication network determines method and device |
| US10623115B2 (en) * | 2016-09-01 | 2020-04-14 | Qualcomm Incorporated | Transmitter beamforming for self-interference cancellation |
| CN107171997B (en) * | 2017-05-08 | 2019-09-10 | 北京科技大学 | A kind of numeric field self-interference removing method of full-duplex communication and a kind of base station |
| CN109511121B (en) * | 2018-12-18 | 2023-04-07 | 展讯通信（上海）有限公司 | Interference elimination method and device |
| CN113395119B (en) * | 2021-06-11 | 2022-11-08 | 成都坤恒顺维科技股份有限公司 | Self-interference elimination method applied to radio frequency port of wireless channel simulator |
| CN115549722B (en) * | 2022-09-02 | 2024-09-06 | 北京理工大学 | Variable step length normalized LMS full duplex nonlinear self-interference elimination method and system |
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