JP2021164014A - Receiver and receiving method - Google Patents

Abstract

To provide a receiver capable of suppressing power caused by the self-interference to the noise level in a full duplex wireless communication system.SOLUTION: There is provided a receiver included in a base station communicating with a terminal via a channel using signals with full duplex wireless communication. The receiver has a suppressor to suppress a self-interference signal caused by the interference between a transmitter included in the base station and the receiver. The receiver comprises: a generation unit that generates a database consisting of input parameters as feature vectors and output parameters as feature vectors when the terminal and the base station is not communicating with each other; and a search unit that searches the database for a given input parameter with lazy learning when the terminal and the base station is communicating with each other. The suppressor calculates an output parameter corresponding to the given input parameter and uses it.SELECTED DRAWING: Figure 1

Description

Embodiments of the present invention relate to receivers and receiving methods.

For example, Non-Patent Document 1 describes a method of estimating a waveform or the like caused by self-interference in an in-band full-duplex system to eliminate the influence caused by a signal generated by self-interference.

H. Guo, J. Xu, and S. Wu, “Realtime software defined self-interference cancellation based on machine learning for in-band full duplex wireless communications,” in 2018 International Conference on Computing, Networking and Communications (ICNC), ( Maui, HI, USA), pp. 1-5, IEEE, July 2018.

However, the conventional method as described in Non-Patent Document 1 has a problem that the power generated by self-interference cannot be suppressed to the noise level of the full-duplex wireless communication system, and a sufficient effect cannot be obtained. ..

One aspect of an embodiment of the present invention is to provide a receiver capable of suppressing power generated by self-interference to a noise level in a full-duplex wireless communication system.

In a base station that communicates by a signal in full-duplex wireless communication via a terminal and a channel, reception having a suppressor that suppresses a self-interference signal generated by interference between a transmitter provided in the base station and a receiver provided in the base station. When the terminal and the base station are not communicating with each other, the terminal and the base station communicate with a generator that generates a database composed of an input parameter which is a feature vector and an output parameter which is a feature vector. Provided is a search unit that searches a predetermined input parameter from a database by lazy learning, and the suppressor provides a receiver that calculates and uses an output parameter corresponding to the predetermined input parameter.

In a base station that communicates with a signal in full-duplex wireless communication via a terminal and a channel, reception having a suppressor that suppresses a self-interference signal generated by interference between a transmitter provided in the base station and a receiver provided in the base station. The first step of generating a database consisting of an input parameter which is a feature vector and an output parameter which is a feature vector when the terminal and the base station are not communicating, which is a control method of the machine, and the terminal and the base. A second step of searching the database for a predetermined input parameter by lazy learning when communicating with a station, and a third step in which the suppressor calculates and uses an output parameter corresponding to the predetermined input parameter. Provided is a method of controlling a receiver, which comprises steps.

According to the present invention, in a full-duplex wireless communication system, it is possible to realize a receiver capable of suppressing the power generated by self-interference to a noise level.

FIG. 1 is a block diagram showing a configuration of a communication system including a receiver according to the present embodiment. FIG. 2 is a sequence diagram provided for explaining the database generation function and the data transmission function according to the present embodiment. FIG. 3 is a flowchart showing a processing procedure of the database generation process. FIG. 4 is a flowchart showing a processing procedure of data transmission processing. FIG. 5 is a schematic view showing an evaluation result of a communication system including a receiver according to the present embodiment.

Hereinafter, one aspect of the embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing a configuration of a communication system including a receiver 20 according to the present embodiment. In the communication system shown in FIG. 1, a terminal 6 such as a smartphone and a base station 1 communicate with each other by a signal in full-duplex wireless communication via a channel which is a frequency band.

Specifically, the base station 1 includes a transmitter 10 for transmitting a signal and a receiver 20 for receiving the signal. The base station 1 transmits a signal to, for example, a terminal 6 via a transmitting antenna 2 included in the transmitter 10. The terminal 6 receives a signal from the transmitter 10 via the terminal antenna 7 included in the terminal 6.

In full-duplex wireless communication, the transmitter 10 included in the base station 1 and the receiver 20 included in the base station interfere with each other to generate a self-interference signal. Therefore, the receiver 20 receives the self-interference signal in addition to the ideal signal which is the ideal signal transmitted from the terminal 6. The receiver 20 has a suppressor that suppresses the self-interference signal.

The terminal 6 transmits data to the base station 1 by transmitting a signal to the receiver 20 via the terminal antenna 7 included in the terminal 6. The receiver 20 receives a signal from the terminal via the receiving antenna 3 included in the receiver 20. The signal received by the receiving antenna 3 includes noise generated by the shape and arrangement of the receiving antenna 3.

The receiver 20 has an antenna canceller 4 for removing noise generated by the shape and arrangement of the receiving antenna 3 (hereinafter, this may be referred to as physical noise) and a self-interference signal.

For example, the antenna canceller 4 is a physical device attached to the receiving antenna 3. An analog canceller 5 such as a balun further removes analog component noise and residual self-interference signals from the signal from which noise and self-interference signals have been removed by the antenna canceller 4. In this way, the signal strength is suppressed by the antenna canceller 4 and the analog canceller 5.

In addition to the transmitting antenna 2, the transmitter 10 includes a function generator 11, a modulator 12, and an amplifier 16 that amplifies a signal. The function generator 11 is a device that generates a signal by mapping binary data to a symbol represented by a vector.

The modulator 12 is a device that modulates a signal, and includes a splitter 13, an oscillator 14, and a phase converter 15. The splitter 13 is a device that decomposes the signal acquired from the function generator 11 into a sine wave component and a cosine wave component.

The signal decomposed into the cosine wave component by the splitter 13 becomes an I-channel signal by being multiplied by the carrier signal whose oscillation frequency is controlled by the oscillator 14. Similarly, the signal decomposed into sinusoidal components by the splitter 13 becomes a Q-channel signal by being multiplied by the carrier signal whose oscillation frequency is controlled by the oscillator 14 and whose phase is converted by the phase converter.

The signal obtained by adding the I-channel signal and the Q-channel signal is amplified by the amplifier 16 and transmitted to the terminal 6 via the transmitting antenna 2. When amplified by the amplifier 16, the amplifier noise, which is the noise generated by the amplifier 16, is added to the signal obtained by adding the I-channel signal and the Q-channel signal.

Here, the suppressor digitally cancels each of the I-channel signal and the Q-channel signal. The suppressor specifically refers to the I-channel digital canceller 35 and the Q-channel digital canceller 36. For example, the I-channel digital canceller 35 and the Q-channel digital canceller 36 are implemented in an integrated circuit.

In addition to the receiving antenna 3, the antenna canceller 4, and the analog canceller 5, the receiver 20 holds a channel establisher 21, a signal detector 22, a digital cancel algorithm searcher 23, a decoder 30, and binary data holding. It has a vessel 24 and.

The channel establisher 21 is a device that establishes a channel between the terminal 6 and the base station 1 and handles values related to the channel. When the channel between the terminal 6 and the base station 1 is established, the channel establisher 21 uses the digital cancel algorithm searcher 23, the I channel digital canceller 35, and the Q channel digital canceller 36, which will be described later. Turn on the switch as shown.

If the channel between the terminal 6 and the base station 1 is not established, the channel establisher 21 should not use the digital cancel algorithm searcher 23, the digital canceler 35 for the I channel, and the digital canceler 36 for the Q channel. Turn off the switch. The signal detector 22 is a device that detects a signal between the terminal 6 and the base station 1 and handles a value related to the signal.

The decoder 30 is a device that decodes a signal, and includes integrators 31, 34, oscillator 32, phase converter 33, I-channel digital canceller, Q-channel digital canceller, bit array determiners 37, 38, and A data combiner 39 is provided.

The I-channel signal detected by the signal detector 22 is multiplied by the carrier signal whose oscillation frequency is controlled by the oscillator 32 and integrated by the integrator 31 to become an I-channel signal.

The I-channel signal detected by the signal detector 22 is multiplied by the carrier signal whose oscillation frequency is controlled by the oscillator 32 and whose phase is converted by the phase converter, and integrated by the integrator 34 to obtain a Q-channel signal.

The bit array of the I-channel signal generated by the integrator 31 is determined by the bit array determinant 37 and transmitted to the data combiner 39. The Q channel signal generated by the integrator 34 has its bit array determined by the bit array determiner 38 and transmitted to the data combiner 39.

The data combiner 39 combines the I-channel signal and the Q-channel signal whose bit array is determined by the bit array determiners 37 and 38 to generate binary data. The binary data retainer 24 is a device that retains the binary data combined by the data combiner 39 and transmits it to a server or the like (not shown).

The database 8 is possessed by, for example, a server, and is composed of an input parameter which is a feature vector and an output parameter which is a feature vector. The size of the database 8 can be dynamically adjusted according to the state of the channel and the like.

Specifically, the state of the channel is determined by the number of communicable channels between the transmitting antenna 2 and the terminal antenna 7 and the number of communicable channels between the transmitting antenna 2 and the receiving antenna 3.

The feature vector refers to a vector in which a plurality of features such as input parameters or output parameters are combined into one. The database 8 is generated based on the information from the generator and the modulator 12 when the terminal 6 and the base station 1 are not communicating with each other. Specifically, the generator refers to the channel establisher 21 and the integrators 31, 34.

The digital cancel algorithm search device 23 (hereinafter, this may be referred to as a search unit) is, for example, an integrated circuit, and when the terminal 6 and the base station 1 are communicating, a predetermined input parameter is input from the database 8. Search by lazy learning.

Further, the I-channel digital canceller 35 and the Q-channel digital canceller 36 calculate and use a predetermined input parameter and a corresponding output parameter when the terminal 6 and the base station 1 are communicating with each other.

はそれぞれ、パラメータｘがデータベース８に記録されていること、パラメータｘがリアルタイム伝送の推定パラメータであること、パラメータｘのサイズであること及びパラメータｘとパラメータｙとのユークリッド距離を示す。なおｘと単に記載した場合は実測値とする。 Here, input parameters and output parameters will be described.

Indicates that the parameter x is recorded in the database 8, that the parameter x is an estimated parameter for real-time transmission, that it is the size of the parameter x, and that the Euclidean distance between the parameter x and the parameter y. If x is simply described, it is an actual measurement value.

………（１）
ここでｂ番目の特徴ベクトルを示すＢ_ｉｎ，ｂは、（２）式で表す。

………（２） B _in is represented by shows the input parameters is a set of feature vectors (1).

……… (1)
Where b th _{B in, b} indicating the feature vector is represented by equation (2).

……… (2)

はそれぞれ、データベース８にｂ番目に記録された値を示す。具体的にはそれぞれ、基地局１の変調器１２によって変調された信号の振幅の実測値である変調器信号振幅、基地局１の変調器１２によって変調された信号の位相の実測値である変調器信号位相、受信機２０が有する受信アンテナ３と端末６が有する端末アンテナ７との間におけるチャネルのゲインの実測値である端末受信機間ゲイン及び受信機２０が有する受信アンテナ３と端末６が有する端末アンテナ７との間におけるチャネルの位相シフトの実測値である端末受信機間位相シフトを示す。受信アンテナ３と端末アンテナ７との間におけるチャネルの端末受信機間ゲインは入力に対する出力の比率を表すものとする。

Each indicates the b-th value recorded in the database 8. Specifically, the modulator signal amplitude, which is the measured value of the amplitude of the signal modulated by the modulator 12 of the base station 1, and the modulation, which is the measured value of the phase of the signal modulated by the modulator 12 of the base station 1, respectively. The device signal phase, the terminal-receiver gain, which is the measured value of the channel gain between the receiving antenna 3 of the receiver 20 and the terminal antenna 7 of the terminal 6, and the receiving antenna 3 and the terminal 6 of the receiver 20. The phase shift between terminal receivers, which is an actually measured value of the phase shift of the channel with the terminal antenna 7 having the antenna 7, is shown. The gain between the terminal receivers of the channel between the receiving antenna 3 and the terminal antenna 7 represents the ratio of the output to the input.

………（３）
式（３）に示すように、１つのＢ_ｉｎ，ｂに対して１つのＢ_out，ｂが対応する。 B _out indicates an output parameter which is a set of feature vectors and is expressed by Eq. (3).

……… (3)
As shown in equation (3), one _{B in, b} for a single B _{out, b} correspond.

………（４）
ここで特徴ベクトルＢ_ｉｎ，ｂに対応するｂ’番目の特徴ベクトルを示すＢ_{out，b,ｂ’}は、（５）式で表す。

………（５） Note that B _{out, b} has a plurality of feature vectors as shown in Eq. (4), unlike _{B in, b, which is one feature vector.}

……… (4)
_{Here, B out, b, b'indicating the b'th} feature vector corresponding to the feature vectors B _{in, b} is expressed by Eq. (5).

……… (5)

はそれぞれ、特徴ベクトルＢ_ｉｎ，ｂに対応してｂ’番目にデータベース８に記録された値を示す。

Indicates the value recorded in the database 8 at the b'th position corresponding to the feature vectors _{Bin and b, respectively.}

Specifically, the estimated gain between transmitters and receivers, which is the gain of the channel between the transmitting antenna 2 of the transmitter 10 and the receiving antenna 3 of the receiver 20, estimated by the channel establisher 21, and the channel establishment, respectively. Estimated phase shift between transmitters and receivers, which is the phase shift of the channel between the transmitting antenna 2 of the transmitter 10 estimated by the device 21 and the receiving antenna 3 of the receiver 20, and the self-interference signal in the I channel. The I-channel quantum effect, which is the measured value of the quantum effect, and the Q-channel quantum effect, which is the measured value of the quantum effect of the self-interference signal in the Q channel, are shown.

Note the value of the parameters constituting B _in and B _out, the _b is obtained in generating a database 8. Therefore, the value of each parameter constituting B _in and B _out, the _b is the measured value or the terminal is the measured value if the channel is not established between the terminal 6 and the base station 1 6 It is an estimated value estimated based on the measured value which is the value measured when the channel between the base station 1 and the base station 1 is not established.

Next, an outline when generating the database 8 and an outline when transmitting data from the terminal 6 to the base station 1 will be described with reference to FIG. FIG. 2 is a sequence diagram provided for explaining the database generation function and the data transmission function according to the present embodiment.

First, the database generation function for generating the database 8 will be described. When generating the database 8, the terminal 6 transmits a null signal to the receiver 20 included in the base station 1 (S1).

Here, the null signal is a signal for which a channel between the terminal 6 and the base station 1 is not established. When the null signal is transmitted, the self-interference signal is transmitted from the transmitter 10 to the receiver 20 (S2).

When the receiver 20 receives the self-interference signal, the channel establisher 21 and the integrators 31 and 34 of the receiver 20 generate input parameters and output parameters (S3). When the self-interference signal is transmitted from the transmitter 10 to the receiver 20, the modulator 12 generates an input parameter.

Specifically, the channel establisher 21 generates input parameters such as gain between terminal receivers and phase shift between terminal receivers. Further, when the transmitter 10 transmits the self-interference signal, the modulator 12 generates the modulator signal amplitude and the modulator signal phase, which are input parameters.

Further, the channel establisher 21 generates the estimated gain between transmitters and receivers and the estimated phase shift between transmitters and receivers, which are output parameters, and the integrators 31 and 34 generate the I-channel quantum effect and the Q-channel quantum effect, which are output parameters. To generate.

Next, the data transmission function will be described. When transmitting data, the terminal 6 transmits an ideal signal, which is an ideal signal intended by the terminal 6, to the receiver 20 included in the base station 1 (S4). When the ideal signal is transmitted, the self-interference signal is transmitted from the transmitter 10 to the receiver 20 (S5).

When the receiver 20 receives the self-interference signal, the digital cancel algorithm searcher 23 included in the receiver 20 has the shortest Euclidean distance between the input parameters of the database 8 and the measured values at the time of channel establishment and the estimated values at the time of channel establishment, which will be described later. A vector is searched from the database 8 as a predetermined input parameter by lazy learning (S6).

………（６）
ここでｂ^＊は０を除く自然数となる。

は、怠惰学習により入力パラメータが検索される際に取得される値である。このためこれらの値は端末６と基地局１との間のチャネルが確立された場合に測定された値である実測値（以下、これをチャネル確立時実測値と呼んでもよい）又は端末６と基地局１との間のチャネルが確立された場合に測定された値である実測値をもとに推定した推定値（以下、これをチャネル確立時推定値と呼んでもよい）となる。 For the search result by lazy learning, select ^{b *} expressed as in Eq. (6).

……… (6)
Here, b ^* is a natural number excluding 0.

Is the value obtained when the input parameter is searched by lazy learning. Therefore, these values are measured values measured when the channel between the terminal 6 and the base station 1 is established (hereinafter, this may be referred to as an actually measured value at the time of channel establishment) or the terminal 6 and the terminal 6. It is an estimated value estimated based on an actually measured value which is a value measured when a channel with the base station 1 is established (hereinafter, this may be referred to as an estimated value at the time of channel establishment).

Specifically, these values are the modulator signal amplitude, which is the measured value of the amplitude of the signal modulated by the modulator 12, and the modulator signal phase, which is the measured value of the phase of the signal modulated by the modulator 12, respectively. Estimated gain between terminal receivers, which is an estimated value of the channel gain between the receiving antenna 3 and the terminal antenna 7, and between terminal receivers, which is an estimated value of the phase shift of the channel between the receiving antenna 3 and the terminal antenna 7. The estimated phase shift is shown. The estimated gain between terminal receivers and the estimated phase shift between terminal receivers are estimated by the channel establisher 21.

Next, the I-channel digital canceller 35 and the Q-channel digital canceller 36 of the receiver 20 have estimated gain and estimated phase as output parameters corresponding to the input parameters searched by the digital cancel algorithm searcher 23 by lazy learning. An output parameter that eliminates the Euclidean distance between the shift and the estimated value is calculated and used (S7).

………（７）
For the calculation result, select ^b'* expressed as in Eq. (7).

……… (7)

は怠惰学習により入力パラメータが検索される際に取得される値である。このためこれらの値はチャネル確立時推定値となる。 ^{Here, equation (7) is b'*} (counting from the left) such that the second equation, which is the second equation counting from the left, becomes 0 (the third equation, which is the third equation counting from the left). It is an expression indicating that the first expression) is selected.

Is the value obtained when the input parameter is searched by lazy learning. Therefore, these values are estimated values at the time of channel establishment.

Specifically, these values are the estimated gain between the transmitter and the receiver, which is the estimated value of the gain of the channel between the transmitting antenna 2 and the receiving antenna 3, and between the transmitting antenna 2 and the receiving antenna 3, respectively. The estimated phase shift between transmitters and receivers, which is an estimated value of the phase shift of the channel, is shown.

The estimated value in lazy learning is calculated by the nearest neighbor search in machine learning such as linear search. The estimated value may be calculated by spatial division such as a kd tree (k-dimensional tree).

Next, the database generation process will be described with reference to FIG. 3, which is a flowchart showing the process procedure of the database generation process. The database generation process is a process for realizing the database generation function. First, the receiving antenna 3 receives a null signal from the terminal 6 (S11).

When the receiving antenna 3 receives the null signal, the channel establisher 21 does not establish the channel, and the input parameters such as the amplitude gain between the terminal receivers and the phase shift between the terminal receivers and the output parameter between the transmitters and the receivers are estimated. Generate gain and estimated phase shift between transmitter and receiver (S12). The database 8 stores the generated amplitude gain between terminal receivers, phase shift between terminal receivers, estimated gain between transmitters and receivers, and estimated phase shift between transmitters and receivers.

Further, when the self-interference signal is transmitted from the transmitter 10 to the receiver 20 when the null signal is transmitted, the modulator 12 generates the modulator signal amplitude and the modulator signal phase which are input parameters. Database 8 stores the generated modulator signal amplitude and modulator signal phase. Alternatively, the input parameters, the modulator signal amplitude and the modulator signal phase, are generated. Database 8 stores the generated modulator signal amplitude and modulator signal phase.

When the channel establisher 21 generates the input parameter and the output parameter, the signal detector 22 receives the I channel signal (hereinafter, this may be referred to as an I channel component) and the Q channel signal (hereinafter, this may be referred to as an I channel component). (May be called) is detected (S13).

When the signal detector 22 detects the I-channel signal and the Q-channel signal, the integrators 31 and 34 integrate the I-channel signal and the Q-channel signal into the I-channel signal and the Q-channel signal. The integrators 31 and 34 generate the I-channel quantum effect and the I-channel quantum effect, which are output parameters, when integrating the I-channel signal and the Q-channel signal (S14).

When the integrators 31 and 34 integrate the I-channel signal and the Q-channel signal, the bit array determiners 37 and 38 determine the bit array of the I-channel signal and the Q-channel signal, and the data combiner 39 determines the bit array. Combines the determined I-channel signal and Q-channel signal (S15).

When the data combiner 39 combines the I-channel signal and the Q-channel signal whose bit array is determined, the binary data retainer 24 is the binary data in which the I-channel signal and the Q-channel signal whose bit array is determined are combined. (S16).

Next, the data transmission process will be described with reference to FIG. 4, which is a flowchart showing the process procedure of the data transmission process. The data transmission process is a process for realizing a data transmission function. First, the receiving antenna 3 receives the ideal signal from the terminal 6 (S21).

When the receiving antenna 3 receives the ideal signal, the channel establisher 21 establishes a channel (S22). When the channel establisher 21 establishes a channel, the digital cancel algorithm searcher 23 searches for input parameters (S23).

When the digital cancel algorithm searcher 23 searches for the input parameters, the signal detector 22 detects the I-channel signal and the Q-channel signal (S24). When the signal detector 22 detects the I-channel signal and the Q-channel signal, the integrators 31 and 34 integrate the I-channel signal and the Q-channel signal into the I-channel signal and the Q-channel signal (S25). ..

When the integrators 31 and 34 integrate the I-channel signal and the Q-channel signal, the I-channel digital canceller 25 and the Q-channel digital canceller 26 perform digital cancellation (S26).

When the I-channel digital canceller 25 and the Q-channel digital canceller 26 perform digital cancellation, the bit array determiners 37 and 38 determine the bit array of the I-channel signal and the Q-channel signal, and the data combiner 39 determines the bit array of the I-channel signal and the Q-channel signal. , The I-channel signal and the Q-channel signal whose bit arrangement has been determined are combined (S27).

When the data combiner 39 combines the I-channel signal and the Q-channel signal whose bit array is determined, the binary data retainer 24 is the binary data in which the I-channel signal and the Q-channel signal whose bit array is determined are combined. (S28).

Next, the evaluation of the communication system including the receiver 20 according to the present embodiment will be described with reference to FIG. 5 based on the simulation results when the signal-to-noise ratio is fixed. FIG. 5 is a schematic view showing an evaluation result of a communication system including a receiver according to the present embodiment.

In FIG. 5, the horizontal axis shows the signal strength suppressed by the antenna canceller 4 and the analog canceller 5, and the vertical axis shows the bit error rate in the communication between the base station 1 and the terminal 6. Graph 51 shows the case where the receiver 20 according to the present embodiment is used. FIG. 52 shows the case where a receiver having no self-interference signal is used.

FIG. 53 shows a case where a receiver that estimates a self-interference signal by using a signal having a pattern determined in advance by the transmitter and a receiver is used, or a receiver that estimates a self-interference signal by using a learning model. Indicates the case of use. The evaluation of the self-interference signal based on the bit error rate is possible because the bits are determined by the bit array determinants 37 and 38 and the signal is quantified.

^{In the case shown in Graph 53, the bit error rate exceeds 10 -1} regardless of the signal strength suppressed by the antenna canceller 4 and the analog canceller 5, and the communication condition is stable and poor. Recognize.

^{In the case shown in Graph 52, the bit error rate is less than 10 -1} regardless of the signal strength suppressed by the antenna canceller 4 and the analog canceller 5, and the communication condition is stable and good. Recognize.

In the case shown in the graph 51, if the signal strength suppressed by the antenna canceller 4 and the analog canceller 5 is up to about -40 ^dB , the bit error rate is less than 10 -1. From this, it can be seen that in the case shown in Graph 51, the communication condition is stable and good unless the conditions are extreme.

Comparing Graph 51 and Graph 53 shows that, for example, model training is not required, so prediction errors do not occur, and because prediction errors do not occur, stable communication conditions are good unless under extreme conditions. It turns out to be.

As described above, according to the present embodiment, for example, in a cellular network, the power generated by self-interference can be suppressed to a noise level, and the in-band full-duplex (IBFD: in-) with stable and good communication conditions can be suppressed. band full-duplex) Communication is possible.

In the above-described embodiment, the case where the digital cancel algorithm searcher 23, the I-channel digital canceller 35, and the Q-channel digital canceller 36 are integrated circuits has been described, but the present embodiment is limited to this. No. For example, the digital cancel algorithm searcher 23, the I-channel digital canceller 35, and the Q-channel digital canceller 36 may be implemented by a program stored in a server or the like.

1 ... base station, 2 ... transmitting antenna, 3 ... receiving antenna, 4 ... antenna canceller, 5 ... analog canceller, 6 ... terminal, 7 ... terminal antenna, 8 ... database, 10 ... ... Transmitter, 11 ... Function Generator, 12 ... Modulator, 13 ... Splitter, 14, 32 ... Antenna, 15, 33 ... Phase Converter, 16 ... Amplifier, 20 ... Receiver, 21 ... ... Channel establisher, 22 ... Signal detector, 23 ... Digital cancel algorithm searcher, 24 ... Binary data retainer, 30 ... Decoder, 31, 34 ... Integrator, 35 ... Digital for I channel Canceller, 36 ... Digital canceller for Q channel, 37, 38 ... Bit sequencer, 39 ... Data combiner.

Claims (6)

In a base station that communicates with a signal in full-duplex wireless communication via a terminal and a channel, reception having a suppressor that suppresses a self-interference signal generated by interference between a transmitter provided in the base station and a receiver provided in the base station. It ’s a machine,
A generator that generates a database composed of an input parameter that is a feature vector and an output parameter that is a feature vector when the terminal and the base station are not communicating with each other.
A search unit for searching a predetermined input parameter from the database by lazy learning when the terminal and the base station are communicating with each other is provided.
The suppressor is a receiver that calculates and uses the output parameter corresponding to the predetermined input parameter. The input parameters include the amplitude of the signal modulated by the base station, the phase of the signal modulated by the base station, the gain of the channel between the receiver and the terminal, and the receiver and the terminal. The receiver according to claim 1, wherein the phase shift of the channel between. The output parameters are an estimated gain between transmitters and receivers, which is an estimated value of the gain of the channel between the transmitter and the receiver, and an estimated value of the phase shift of the channel between the transmitter and the receiver. The reception according to claim 1, which is an estimated phase shift between transmitters and receivers, an actually measured value of the quantum effect of the self-interfering signal on the I channel, and an actually measured value of the quantum effect of the self-interfering signal on the Q channel. Machine. The receiver according to claim 1, wherein the generation unit generates the input parameter and the output parameter by receiving the null signal transmitted from the terminal by the base station. By the lazy learning, the search unit sets the predetermined input parameter as a vector having the shortest Euclidean distance between the input parameter of the database, the measured value at the time of channel establishment, and the estimated value at the time of channel establishment.
The suppressor eliminates the Euclidean distance between the transmitter-receiver estimated gain and the transmitter-receiver estimated phase shift and the channel establishment estimated value as the output parameter corresponding to the input parameter. Calculate and use output parameters,
The receiver according to claim 3. In a base station that communicates with a signal in full-duplex wireless communication via a terminal and a channel, reception having a suppressor that suppresses a self-interference signal generated by interference between a transmitter provided in the base station and a receiver provided in the base station. It ’s a control method for the machine.
The first step of generating a database composed of an input parameter which is a feature vector and an output parameter which is a feature vector when the terminal and the base station are not communicating with each other.
A second step of searching the database for a predetermined input parameter by lazy learning when the terminal and the base station are communicating with each other.
A third step in which the suppressor calculates and uses the output parameter corresponding to the predetermined input parameter.
A receiver control method.

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