CN102769487B - Automatic interference elimination system and method based on multiple receiving antennas - Google Patents
Automatic interference elimination system and method based on multiple receiving antennas Download PDFInfo
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Abstract
The invention discloses an automatic interference elimination system and method based on multiple receiving antennas. The system comprises a transmitting antenna and K receiving antennae in equally spaced arrangement in a circle centering the transmitting antenna, as well as an interference elimination device which further comprises K splitters, K phase inverters, K combiners, a selector and a demodulator. According to the invention, RF (Radio Frequency) signals of the receiving antennae can be utilized to eliminate the interference simply and effectively, and meanwhile, the effect on gain in the receiving direction of the object signals, caused by eliminating the signals in interference direction, is reduced. As a way of demodulating the strongest path of signal from the combined signals after K paths of interference are eliminated is adopted, so that the path of signal with strongest gain in the incidence direction of the object signals can be obtained from the K paths of signals, the direction with 0 gain is eliminated, and the stability of the receiving signal energy is ensured.
Description
Technical field
The invention belongs to and relate to wireless communication field, particularly a kind of system based on multiple receive antenna and removing method.
Background technology
In a wireless communication system, traditional duplex mode is mainly divided into FDD and TDD two kinds.The duplex mode of a kind of transceiver channel use same frequency of new proposition in recent years, identical time slot more and more comes into one's own.Need orthogonally to separate different from traditional duplex mode sending and receiving channel, co-frequency co-time slot duplexing can the communication channel of multiplexing both direction on one channel, and thus spectrum efficiency can double.This with in duplex system while of frequently, transmitting antenna is the Main Bottleneck that influential system performance promotes further for the interference of reception antenna.The method such as adaptive-filtering, antenna isolation is mainly used to solve the problems referred to above at present.
Utilize in the method for multi-antenna beam shaping reduction full duplex system sending and receiving self-interference what proposed in the past, general employing transmitting antenna and reception antenna spacing one segment distance are placed, utilize Beamforming technology to make launching antenna array on reception antenna direction, form the transmitting pattern of zero gain, or make receiving antenna array form the receiving pattern of zero gain in transmitting antenna direction to reduce interference.The shortcoming of these methods can produce blind area on zero gain direction.If destination node is in the party upwards, then can affect normal sending and receiving communication.
Summary of the invention
For above prior art Problems existing, the invention provides a kind of new system and removing method, the radiofrequency signal of multiple reception antenna can be utilized to carry out simply and effectively disturbing elimination, reduce the impact on the gain of echo signal receiving directivity caused because of the signal of elimination interference radiating way simultaneously.
One object of the present invention is to provide a kind of system based on multiple receive antenna.
System of the present invention comprises: a transmit antennas and K root reception antenna; And the interference blanking unit to be connected with K root reception antenna, interference blanking unit comprises K splitter, a K inverter, a K mixer, selector and demodulator further; The equidistant arrangement on the circle taking transmitting antenna as the center of circle of K root reception antenna, the distance between adjacent reception antenna is equidistantly, forms aerial array; The signal of K root reception antenna transfers to K splitter respectively; The signal of corresponding reception antenna is divided into two-way by each in K splitter respectively, a road input inverter, and the output of inverter and the adjacent reception antenna direct output signal after splitter jointly inputs to mixer and carries out signal merging; The K road combined signal produced by K root reception antenna inputs to selector; Selector selects most Qiang mono-road signal to input to demodulator; Wherein, K is the natural number of >=2.
The equidistant arrangement on the circle taking transmitting antenna as the center of circle of K root reception antenna, adjacent antenna spacing is d, and thus adjacent two reception antennas become the fan angle number of degrees to be 2 π/K with the center of circle.In same frequency simultaneously duplex system, the signal that transmitting antenna sends is interference signal for K reception antenna, because transmitting antenna and reception antenna are apart from very near, therefore transmitting antenna can produce huge interference signal to reception antenna, need the self-interference that causes transmitting on reception antenna to eliminate, so that can the relatively low echo signal of received power for this reason.
Because K root reception antenna and transmitting antenna are equidistant, so the interference signal arriving every root reception antenna is with width homophase.In practice, every root reception antenna can be made to receive the interference signal of same width homophase by calibration putting position.Therefore the signal of optional two adjacent reception antennas, wherein will input to the laggard line phase reversion of inverter by a road signal after splitter, input to mixer with the direct output signal after splitter of other again and carry out signal merging, namely effectively can eliminate the self-interference with duplex system while of frequently, avoid simultaneously and do complicated signal transacting at reception antenna radio-frequency head.The signal of often adjacent two reception antennas in reception antenna is carried out anti-phasely offset merging, K road combined signal can be generated so altogether.Because an above-mentioned K combined signal defines the individual different receiving pattern of K, when receiving pattern is when target signal direction gain is stronger, stronger echo signal can be received.Next, K road combined signal is inputed to selector, selector is selected to comprise echo signal most Qiang mono-road signal and is inputed to demodulator and carry out follow-up demodulation, to guarantee echo signal receiving intensity from the combined signal of K road.
Without loss of generality, analyze two adjacent antennas, the signal phase received with first reception antenna is as fixed phase.If the signal X that first reception antenna and second reception antenna receive
1(t) and X
2t () is respectively:
X
1(t)＝I(t)+S(t)+N
1(t) （1）
Wherein, I (t) represents self-interference signal, and S (t) represents echo signal, N
1(t) and N
2t () represents the noise of first reception antenna and second reception antenna respectively,
represent that echo signal arrives the phase difference of two reception antennas.
Phasing back is carried out to the signal of second reception antenna, and obtains after two Signal averaging:
For aerial array, the phase difference in above formula
be the function of the incident angle of echo signal, can be expressed as
wherein, R is receiving antenna array radius, and λ is wavelength, and θ is the incidence angle of echo signal.
Signal S in formula (3)
1the coefficient of (t)
be the directive gain after reception antenna combined signal.Reception antenna is making after interference is eliminated
incident angle θ on can realize maximum gain, and order
incident angle θ on then gain be zero.
Another object of the present invention is to provide a kind of self-interference removing method based on multiple receive antenna.
Self-interference removing method of the present invention, specifically comprises the following steps:
1) in same Simultaneous Transmission And Receiving System frequently, adopt a transmit antennas and K root reception antenna, K root reception antenna is equidistantly put on the circle taking transmitting antenna as the center of circle, form aerial array, utilize the calibration steps that aerial array is conventional, the signal of its own transmission antenna that often adjacent two reception antennas are received is with width homophase;
2) to the signal that every root reception antenna obtains after splitter, input to inverter and carry out phasing back, the more direct output signal of the reception antenna be adjacent after splitter inputs to mixer and carries out signal merging, such common property raw K road combined signal;
3) K road combined signal is inputed to selector, selector is selected to comprise echo signal most Qiang mono-road signal and is inputed to demodulator and carry out follow-up demodulation from the combined signal of K road, and wherein, K is the natural number of >=2.
Wherein, in step 2) in, the merging of adjacent reception antenna can be clockwise adjacent, also can be adjacent counterclockwise.
In step 2) in, the direct output signal of each root reception antenna after splitter in K root reception antenna is X
1(t), the signal X that the reception antenna be adjacent receives
2t (), is expressed as:
X
1(t)＝I(t)+S(t)+N
1(t) （4）
Wherein, I (t) represents self-interference signal, and S (t) represents echo signal, N
1(t) and N
2the t noise of reception antenna that () represents this root reception antenna respectively and be adjacent,
represent that echo signal arrives the phase difference of two reception antennas.
Phasing back is carried out to the signal of adjacent reception antenna, and combined signal Y (t) after being merged by two Signal averaging is expressed as:
For aerial array, the phase difference in above formula
be the function of echo signal incident angle, be expressed as
wherein, R is receiving antenna array radius, and λ is wavelength, and θ is the incidence angle of echo signal.
In step 3), adopt the method choice of envelope detected most Qiang mono-road signal, namely select signal envelope level most Gao mono-road signal to carry out follow-up demodulation.
Beneficial effect of the present invention:
One of advantage of the present invention is the mode by selecting signal most Qiang mono-road signal to carry out demodulation in the combined signal after the interference of K road is eliminated, obtain at echo signal incident direction gain most Qiang mono-road signal in the signal of K road, thus avoid merged by a pair reception antenna after caused target received signal energy loss.Method of the present invention eliminates the direction that gain is 0, ensure that the stability of Received signal strength energy.
Accompanying drawing explanation
Fig. 1 is the structural representation of the aerial array of the system based on multiple antennas reception of the present invention;
Fig. 2 is the structural representation of the interference blanking unit of system of the present invention;
Fig. 3 of the present inventionly works as K=2, the directional diagram of the Signal reception amplitude space of embodiment during d=15 λ;
Fig. 4 of the present inventionly works as K=5, the curve chart of the directive gain minimum value-antenna distance of the embodiment during λ of d=λ ~ 100.
Embodiment
Below in conjunction with accompanying drawing, in detail embodiments of the present invention are described by embodiment.
Fig. 1 gives the structural representation of the aerial array of a transmit antennas and 3 reception antenna formation.K(K=3 as shown in Figure 1) the equidistant arrangement on the circle taking transmitting antenna as the center of circle of root reception antenna, adjacent antenna spacing is d, and thus adjacent two reception antennas become the fan angle number of degrees to be 2 π/K with the center of circle, and the incidence angle of echo signal is θ.
The structural representation of Fig. 2 to be K be interference blanking unit of 5.As shown in Figure 2, interference blanking unit comprises K splitter 1, a K inverter 2, a K mixer, selector 3 and demodulator 4; The signal of K root reception antenna transfers to K splitter respectively; The signal of reception antenna is divided into two-way by each in K splitter respectively, a road input inverter, and the output of inverter and the adjacent reception antenna direct output signal after splitter jointly inputs to mixer and carries out signal merging; The K road combined signal produced by K root reception antenna inputs to selector; Selector selects most Qiang mono-road signal to input to demodulator; Wherein, K is the natural number of >=2.
Figure 3 shows that K=2, directive gain figure during d=15.As seen from Figure 3, reception antenna is making after interference is eliminated
incident angle θ on can realize maximum gain, and order
incident angle θ on then gain be zero.
The curve chart of directive gain minimum value-antenna distance when Fig. 4 is K=5, d=λ ~ 100 λ.One of advantage of the present invention is the mode by selecting signal most Qiang mono-road signal receiving in the signal after the interference of K road is eliminated, obtain at echo signal incident direction gain most Qiang mono-road signal in the signal of K road, thus avoid merged by a pair reception antenna after caused target received signal energy loss.Choose K=5, d=λ ~ 100 λ emulates, the method proposed according to the present invention, chooses signal most Qiang mono-road signal at every turn, and the minimum value of gain in the echo signal incident direction being recorded in 0 ~ 360 degree, result as shown in Figure 4.As seen from Figure 4, this method eliminates the direction that gain is 0, ensure that the stability of Received signal strength energy.
It is finally noted that, the object publicizing and implementing mode is to help to understand the present invention further, but it will be appreciated by those skilled in the art that: without departing from the spirit and scope of the invention and the appended claims, various substitutions and modifications are all possible.Therefore, the present invention should not be limited to the content disclosed in embodiment, and the scope that the scope of protection of present invention defines with claims is as the criterion.
Claims (5)
1. a system, is characterized in that, described elimination system comprises: a transmit antennas and K root reception antenna; And the interference blanking unit to be connected with K root reception antenna, interference blanking unit comprises K splitter (1), a K inverter (2), a K mixer, selector (3) and demodulator (4) further; The equidistant arrangement on the circle taking transmitting antenna as the center of circle of K root reception antenna, the distance between adjacent reception antenna is equidistantly, forms aerial array; The signal of K root reception antenna transfers to K splitter (1) respectively; The signal of corresponding reception antenna is divided into two-way by each in K splitter (1) respectively, one road input inverter (2), the output of inverter (2) and the direct output signal of adjacent reception antenna after splitter (1) jointly input to mixer and carry out signal merging; The K road combined signal produced by K root reception antenna inputs to selector (3); Selector (3) selects most Qiang mono-road signal to input to demodulator (4); Wherein, K is the natural number of >=2.
2. based on a self-interference removing method for multiple receive antenna, it is characterized in that, described self-interference removing method, specifically comprises the following steps:
1) in same Simultaneous Transmission And Receiving System frequently, adopt a transmit antennas and K root reception antenna, K root reception antenna is equidistantly put on the circle taking transmitting antenna as the center of circle, form aerial array, utilize the calibration steps that aerial array is conventional, the signal of its own transmission antenna that often adjacent two reception antennas are received is with width homophase;
2) to the signal that every root reception antenna obtains after splitter, input to inverter and carry out phasing back, the direct output signal of the reception antenna be adjacent again after splitter inputs to mixer and carries out signal merging, such common property raw K road combined signal;
3) K road combined signal is inputed to selector, selector is selected to comprise echo signal most Qiang mono-road signal and is inputed to demodulator and carry out follow-up demodulation from the combined signal of K road, and wherein, K is the natural number of >=2.
3. removing method as claimed in claim 2, is characterized in that, in step 2) in, the merging of adjacent reception antenna is clockwise adjacent, or adjacent counterclockwise.
4. removing method as claimed in claim 2, is characterized in that, in step 2) in, the direct output signal of each root reception antenna after splitter in described K root reception antenna is X
1(t), the signal X that the reception antenna be adjacent receives
2t (), is expressed as:
X
1(t)＝I(t)+S(t)+N
1(t)
Wherein, I (t) represents self-interference signal, and S (t) represents echo signal, N
1(t) and N
2the t noise of reception antenna that () represents this root reception antenna respectively and be adjacent,
represents that echo signal arrives the phase difference of two reception antennas, phasing back is carried out to the signal of adjacent reception antenna, and combined signal Y (t) after being merged by two Signal averaging is expressed as:
For aerial array, the phase difference in above formula
be the function of echo signal incident angle, be expressed as
wherein, R is receiving antenna array radius, and λ is wavelength, and θ is the incidence angle of echo signal.
5. removing method as claimed in claim 2, is characterized in that, in step 3) in, adopt the method choice of envelope detected most Qiang mono-road signal, namely select signal envelope level most Gao mono-road signal to carry out follow-up demodulation.
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| CN103338172B (en) * | 2013-07-24 | 2015-11-11 | 电子科技大学 | A kind of same-frequency full-duplex self-interference offset method while of under multi-path environment |
| CN104518808B (en) | 2013-09-29 | 2017-07-14 | 华为技术有限公司 | Self-interference signal abatement apparatus and method |
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| CN104980203B (en) * | 2015-06-16 | 2018-05-01 | 山东大学 | Isolation and the suppressing method of shared full duplex large-scale antenna array and self-interference |
| CN108206798B (en) * | 2016-12-20 | 2020-07-28 | 北京大学 | Communication method for inhibiting interference of adjacent transmitters |
| CN110391892B (en) | 2018-04-19 | 2022-05-13 | 华为技术有限公司 | Full-duplex self-interference weakening method and full-duplex self-interference weakening system |
| CN109257055A (en) * | 2018-08-14 | 2019-01-22 | 云南频谱通信网络有限公司 | A kind of anti-interference method when reception electromagnetic wave |
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