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 PDF

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CN102769487B
CN102769487B CN201210169314.5A CN201210169314A CN102769487B CN 102769487 B CN102769487 B CN 102769487B CN 201210169314 A CN201210169314 A CN 201210169314A CN 102769487 B CN102769487 B CN 102769487B
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receiving antennas
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interference
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CN102769487A (en
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焦秉立
马猛
段晓辉
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Beijing Wide Technology Co Ltd
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Peking University
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Abstract

本发明公开了一种基于多接收天线的自干扰消除系统及消除方法。本发明的自干扰消除系统包括：一根发射天线和K根接收天线；K根接收天线在以发射天线为圆心的圆上等距离排列，相邻接收天线间的距离为等间距；以及干扰消除装置，干扰消除装置进一步包括K个分路器、K个反相器、K个合路器、选择器和调解器。本发明可以利用多个接收天线的射频信号进行简单而有效地干扰消除，同时减少因消除干扰方向的信号而引起的对目标信号接收方向性增益的影响。本发明通过在K路干扰消除后的合并信号中选择信号最强的一路信号进行解调的方式，获得了K路信号中在目标信号入射方向增益最强的一路信号，消除了增益为0的方向，保证了接收信号能量的稳定性。

The invention discloses a self-interference elimination system and elimination method based on multiple receiving antennas. The self-interference elimination system of the present invention comprises: a transmitting antenna and K receiving antennas; K receiving antennas are arranged equidistantly on a circle centered on the transmitting antenna, and the distance between adjacent receiving antennas is equidistant; and interference elimination device, the interference elimination device further includes K splitters, K inverters, K combiners, selectors and modulators. The invention can use the radio frequency signals of multiple receiving antennas to perform simple and effective interference elimination, and at the same time reduce the influence on the receiving directivity gain of the target signal caused by the elimination of signals in the interference direction. The present invention obtains the signal with the strongest gain in the incident direction of the target signal among the K-channel signals by selecting the signal with the strongest signal among the combined signals after the K-channel interference is eliminated, and eliminates the signal with a gain of 0. The direction ensures the stability of the received signal energy.

Description

A kind of system based on multiple receive antenna and removing method
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)

1.一种自干扰消除系统，其特征在于，所述消除系统包括：一根发射天线和K根接收天线；以及与K根接收天线相连接的干扰消除装置，干扰消除装置进一步包括K个分路器(1)、K个反相器(2)、K个合路器、选择器(3)和调解器(4)；K根接收天线在以发射天线为圆心的圆上等距离排列，相邻接收天线间的距离为等间距，形成天线阵列；K根接收天线的信号分别传输至K个分路器(1)；K个分路器(1)中的每一个分别将所对应的接收天线的信号分成两路，一路输入反相器(2)，反相器(2)的输出与相邻的接收天线经分路器(1)后的直接输出信号共同输入至合路器进行信号合并；由K根接收天线产生的K路合并信号输入至选择器(3)；选择器(3)选择最强的一路信号输入至调解器(4)；其中，K为≥2的自然数。1. A self-interference canceling system, characterized in that, the canceling system includes: a transmitting antenna and K receiving antennas; and an interference canceling device connected to the K receiving antennas, and the interference canceling device further includes K branch antennas (1), K inverters (2), K combiners, selectors (3) and modulators (4); K receiving antennas are arranged equidistantly on a circle centered on the transmitting antenna, The distance between adjacent receiving antennas is equidistant, forming an antenna array; the signals of K receiving antennas are respectively transmitted to K splitters (1); each of the K splitters (1) divides the corresponding The signal of the receiving antenna is divided into two paths, one path is input to the inverter (2), and the output of the inverter (2) and the direct output signal of the adjacent receiving antenna through the splitter (1) are jointly input to the combiner for further processing. Signal combining: K channels of combined signals generated by K receiving antennas are input to the selector (3); the selector (3) selects the strongest signal of one channel to input to the modulator (4); wherein, K is a natural number ≥ 2. 2.一种基于多接收天线的自干扰消除方法，其特征在于，所述自干扰消除方法，具体包括以下步骤：2. A self-interference cancellation method based on multiple receiving antennas, characterized in that, the self-interference cancellation method specifically comprises the following steps: 1)在同频同时收发系统中，采用一根发射天线和K根接收天线，将K根接收天线在以发射天线为圆心的圆上等间距摆放，形成天线阵列，利用天线阵列常用的校准方法，使得每相邻两根接收天线收到的自身发射天线的信号是同幅同相的；1) In the simultaneous transmission and reception system at the same frequency, one transmitting antenna and K receiving antennas are used, and the K receiving antennas are placed at equal intervals on a circle centered on the transmitting antenna to form an antenna array. method, so that the signals received by each adjacent two receiving antennas are of the same amplitude and phase; 2)对每根接收天线上获得的信号经分路器后，输入至反相器进行相位反转，再与其相邻的接收天线经分路器后的直接输出信号输入至合路器进行信号合并，这样共产生K路合并信号；2) After passing through the splitter, the signal obtained from each receiving antenna is input to the inverter for phase inversion, and then the direct output signal of the adjacent receiving antenna after passing through the splitter is input to the combiner for signal Merge, so that a total of K road merged signals are generated; 3)将K路合并信号输入至选择器，选择器从K路合并信号中选择包含目标信号最强的一路信号输入至调解器进行后续的解调，其中，K为≥2的自然数。3) Input K-channel combined signals to the selector, and the selector selects the signal containing the strongest target signal from the K-channel combined signals and inputs it to the modulator for subsequent demodulation, wherein K is a natural number ≥ 2. 3.如权利要求2所述的消除方法，其特征在于，在步骤2)中，相邻的接收天线的合并是顺时针相邻，或者是逆时针相邻。3. The cancellation method according to claim 2, characterized in that, in step 2), the combination of adjacent receiving antennas is clockwise adjacent or counterclockwise adjacent. 4.如权利要求2所述的消除方法，其特征在于，在步骤2)中，所述K根接收天线中的每一根接收天线经分路器后的直接输出信号为X1(t)，与其相邻的接收天线接收到的信号X2(t)，分别表示为：4. The elimination method according to claim 2, wherein, in step 2), the direct output signal of each receiving antenna in the K receiving antennas after the splitter is X 1 (t) , and the signal X 2 (t) received by its adjacent receiving antenna is expressed as: X1(t)＝I(t)+S(t)+N1(t)X 1 (t)=I(t)+S(t)+N 1 (t) 其中，I(t)表示自干扰信号，S(t)表示目标信号，N1(t)和N2(t)分别表示这根接收天线和与其相邻的接收天线的噪声，表示目标信号到达两根接收天线的相位差，对相邻的接收天线的信号进行相位反转，并将两个信号叠加合并后的合并信号Y(t)表示为：Among them, I(t) represents the self-interference signal, S(t) represents the target signal, N 1 (t) and N 2 (t) represent the noise of this receiving antenna and its adjacent receiving antenna, respectively, Represents the phase difference of the target signal arriving at the two receiving antennas, reverses the phase of the signals of the adjacent receiving antennas, and expresses the combined signal Y(t) after the two signals are superimposed and combined as: 对于天线阵列，上式中的相位差是目标信号入射角度的函数，表示为其中，R为接收天线阵半径，λ为波长，θ为目标信号的入射角。For an antenna array, the phase difference in the above formula is a function of the incident angle of the target signal, expressed as Among them, R is the radius of the receiving antenna array, λ is the wavelength, and θ is the incident angle of the target signal. 5.如权利要求2所述的消除方法，其特征在于，在步骤3)中，采用包络检测的方法选择最强的一路信号，即选择信号包络电平最高的一路信号进行后续的解调。5. elimination method as claimed in claim 2, it is characterized in that, in step 3) in, adopt the method for envelope detection to select the strongest one-way signal, promptly select the highest one-way signal of signal envelope level to carry out follow-up solution Tune.
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