KR100831901B1 - Radio repeating apparatus using ARFEC and method thereof - Google Patents

Abstract

The present invention relates to a wireless relay apparatus using an adaptive reproduction feedback predictor and a method thereof, and a recording medium recording the same. An antenna for transmitting / receiving forward / reverse relay signals to be relayed with a terminal of a base station or a service area, and A band pass filter for band-passing forward / reverse relay signals transmitted / received through; a switching unit for switching forward / reverse relay signals from the band pass filter; and a baseband signal for switching forward / reverse relay signals switched by the switching unit A conversion unit for converting the signal to a conversion unit; a synchronization acquisition unit for acquiring synchronization with the terminal of the base station or the service area by using the forward / reverse relay signal converted by the conversion unit, and the conversion unit according to information from the synchronization acquisition unit. Adaptive Replay Feedback Prediction Eliminating Feedback Signal Components from Negatively Transformed Forward / Reverse Relay Signals A configuration including an eraser is provided.

By using the wireless relay apparatus and method using the adaptive reproduction feedback predictor as described above, and the recording medium recording the same, the oscillation phenomenon is prevented by adapting to changes in the surrounding environment, thereby improving stability and keeping the output signal constant. It is possible to obtain good C / I by compensating for the distortion of the signal to be relayed at the same time as the advantage of the adaptive adaptive feedback canceller that can be applied to various mobile communication systems while maintaining the quality of service at a certain level. Highly reliable relay service is possible.

Adaptive Recall Predictive Canceller, Adaptive Recall Predictive Canceller, Time Division Redundancy (TDD), Radio Relay

Description

Radio repeating apparatus using adaptive feedback predictor with equalizer and its method {Radio repeating apparatus using ARFEC and method

1 is a configuration diagram of an embodiment of a time division duplex (TDD) wireless relay apparatus using a conventional adaptive feedback prediction canceller.

2 is a diagram illustrating a conventional adaptive feedback prediction canceller;

3 is an exemplary view of an adaptive regenerative feedback predictor canceller according to the present invention;

4 is an exemplary view of the equalizer shown in FIG. 3;

FIG. 5 is a flowchart illustrating an adaptive reproduction feedback prediction cancellation method and a time division duplex (TDD) radio relay method using the same according to the present invention.

* Explanation of symbols for the main parts of the drawings

100: donor antenna 101: donor band pass filter

102 donor switching unit 103 first down converter

104: adaptive feedback prediction canceller 105: synchronization acquisition unit

106: first up-conversion unit 107: service switching unit

108: service band pass filter 109: service antenna

110: second down-converter 111: second up-converter

304: first feedback signal removal unit 306: first reverse feedback signal synthesis unit

308: first feedback signal detection unit 310: first automatic gain control unit

312: first automatic delay adjusting unit 314: control unit

316: second feedback signal removing unit 318: second feedback signal synthesis unit

320: second feedback signal detection unit 322: second automatic gain control unit

324: second automatic delay adjusting unit 326: original signal generating unit

328: first light unit 330: second light unit

The present invention relates to an adaptive playback feedback predictor (AFEC), a method thereof, a time division duplex wireless relay apparatus using the same, and a computer-readable recording medium having recorded thereon a program for realizing the method. Adaptive to improve the service stability by compensating for the distorted signal by the multipath among the signal components to be relayed by adaptively changing the channel environment and removing the feedback signal components from the target signal. The present invention relates to a wireless relay apparatus using a reproduction feedback predictive canceller, a method thereof, and a recording medium recording the same.

First, in the present invention, the signal transmission direction from the base station to the terminal is referred to as "forward (downlink)", and the signal transmission direction from the terminal to the base station is defined as "reverse (uplink)".

1 is a block diagram of an embodiment of a time division duplex (TDD) radio relay apparatus using a conventional adaptive feedback prediction canceller, which is disclosed in Korean Patent Application No. 10-2006-21477.

As shown in FIG. 1, a time division duplex (TDD) wireless relay apparatus using an adaptive feedback prediction canceller includes: a donor antenna 100 for transmitting / receiving a signal (forward / reverse relay signal) to be relayed with a base station; A donor band pass filter 101 for band-passing forward / reverse relay signals transmitted / received through the donor antenna 100 and from the donor band pass filter 101 under the control of the synchronization acquisition unit 105. Donor switching unit 102 for switching the forward relay signal to the first down-conversion unit 103 or the reverse relay signal from the second up-conversion unit 111 to the donor band pass filter 101, the donor switching The first down converter 103 for down-converting the forward relay signal switched by the unit 102 into a baseband signal, and the base station by using the forward relay signal down-converted by the first down converter 103; Dong of In accordance with the information from the synchronization acquisition unit 105 and the synchronization acquisition unit 105 to obtain a, in the forward relay signal or the second down-conversion unit 110 down-converted by the first down-conversion unit 103 Adaptive feedback prediction canceller 104 for removing feedback signals from the down-converted backward relay signal and adjusting the gain of the forward / reverse relay signal, and forwarding the forward relay signal from adaptive feedback prediction canceller 104 again. A second up-conversion unit 111 for up-converting to a high frequency band relay signal, a service antenna 109 for transmitting / receiving a signal (forward / reverse relay signal) to be relayed with a terminal in a service area, and the service antenna A service band pass filter 108 for band-filtering forward / reverse relay signals transmitted / received through 109 and a forward direction from the first up-converter 106 under the control of the synchronization acquisition unit 105. medium A service switching unit 107 and a service switching unit for switching a signal to the service band pass filter 108 or switching a reverse relay signal from the service band pass filter 108 to a second down-conversion unit 110. A second down-conversion unit 110 for down-converting the switched reverse relay signal to a baseband signal for transmission to the adaptive feedback prediction canceller 104, and the adaptive feedback prediction canceller 104 A second up-converter 111 for up-converting the reverse relay signal from the back to the relay signal of the high frequency band and transmitting the uplink relay signal to the donor switching unit 102.

Here, the adaptive feedback prediction canceller 104 performs the function of removing the feedback signal for the signal to be relayed together with the synchronization acquisition unit 105 and automatically controlling the gain to control the magnitude of the output signal. . Here, the adaptive feedback prediction canceller 104 further performs an automatic delay adjustment function to prevent mutual interference of the feedback signal and the multipath signal. That is, the adaptive feedback prediction canceller 104 adjusts the generation delay of the feedback signal so that the feedback signal can be generated when the multipath signal is not received, so that the multipath signal and the feedback signal do not overlap each other. To cancel the feedback signal.

The adaptive feedback prediction canceller 104 estimates the radio channel environment around the feedback signal and the TDD radio relay apparatus by using the correlation between the base station ID obtained from the synchronization acquisition unit 105 and the forward relay signal. do.

When the synchronization acquisition unit 105 stably acquires the synchronization signal for a predetermined time or more under a condition of a predetermined signal magnitude or more, the synchronization acquisition is performed to apply the synchronization signal to the adaptive feedback prediction canceller 104, and the synchronization acquisition is performed. If not, the synchronization signal is not applied to the adaptive feedback prediction canceller 104, thereby stopping all operations of the TDD radio relay device until synchronization is achieved. In addition, the synchronization acquisition unit 105 takes into account the signal processing time required by the adaptive feedback prediction canceller 104 of the TDD radio relay device and the time required by the filter and other components. The smooth on / off switching operation effectively removes the feedback signal, allowing the output quality to remain constant.

2 is a configuration diagram of an embodiment of a conventional adaptive feedback prediction canceller, and since only uplink and downlink structures are the same, only the downlink without a switching unit will be described.

The adaptive feedback predictor of FIG. 2 includes a first automatic gain control unit 210 for automatically adjusting the output signal size of the forward relay signal to be relayed and a first feedback to update the phase and magnitude of the feedback signal. A signal detector 208 is provided, and the first feedback signal detector 208 is input from the baseband forward relay signal input from the first automatic gain adjuster 210 and the first down converter 103. The phase and magnitude of the residual feedback signal present in the forward relay signal are detected from the baseband forward relay signal.

The first reverse feedback signal synthesis is performed using the phase and magnitude of the baseband forward relay signal input from the first automatic gain control unit 210 and the feedback signal input from the first feedback signal detector 208. The unit 206 generates an inverse feedback signal for use in removing the feedback signal existing in the forward relay signal. In the first feedback signal removing unit 204, the feedback signal existing in the forward relay signal down-converted by the first downconverting unit 103 is used by using the inverse feedback signal from the first inverse feedback signal synthesizing unit 206. Remove and transfer to the first automatic gain control unit 210. Each component is controlled by the controller 214 to transmit the forward / reverse relay signal after removing the feedback signal existing in the forward / reverse relay signal to be relayed.

However, even if the feedback signal is removed from the repeater operated in the above manner, the relay target signal itself is a signal that is already distorted by the multipath. Therefore, if a signal having a distortion is transmitted in a forward / reverse direction, a transmission error may occur by worsening a carrier to interference ratio (C / I).

In addition, as an example of the conventional technology related to this technology, Patent Registration 0342002 (registered on July 02, 2002, adaptive feedback interference noise canceller), Patent Publication No. 2002-0092031 (published Dec. 11, 2002, wireless relay device of mobile communication system) Patent Publication No. 2003-0069522 (published Feb. 21, 2002, broadband wireless relay device using interference signal cancellation technology of mobile communication system), Patent Publication No. 2003-0066062 (released Feb. 04, 2002) Wireless relay method) and the like are known.

An object of the present invention is to solve the problems described above, to compensate for the distorted signal by the multi-path of the signal components to be relayed to improve the quality of the signal relay, to remove the feedback signal components from the relay target signal The present invention provides a wireless relay apparatus using an adaptive reproduction feedback predictive canceller for improving stability, a method thereof, and a recording medium recording the same.

In order to achieve the above object, a wireless relay apparatus according to the present invention includes an antenna for transmitting / receiving forward / reverse relay signals to be relayed with a terminal of a base station or a service area, and a forward / reverse relay signal transmitted / received through the antenna. A band pass filter for band filtering the switching unit, a switching unit switching a forward / reverse relay signal from the band pass filter, a conversion unit for converting the forward / reverse relay signal switched by the switching unit to a baseband signal, the conversion unit From the forward / reverse relay signal converted by the conversion unit according to the synchronization acquisition unit for obtaining synchronization with the terminal of the base station or the service area using the forward / reverse relay signal converted from And an adaptive reproduction feedback predictive canceller that removes the feedback signal component.

In the wireless relay apparatus of the present invention, the adaptive reproduction feedback predictive canceller removes the feedback signal and compensates for the distorted signal due to the multipath.

In the wireless relay apparatus according to the present invention, the adaptive reproduction feedback predictive canceller includes a first automatic gain adjuster, a first automatic gain adjuster, and an external device for automatically adjusting a gain of a forward relay signal to be relayed. A first feedback signal detector for detecting and updating the phase and magnitude of the feedback signal from the forward relay signal from the first down converter, from the forward relay signal from the first automatic gain control unit and from the first feedback signal detector A first inverse feedback signal synthesizing unit for generating an inverse feedback signal by using a phase and a magnitude of the feedback signal of the first inverse; A first feedback signal removing unit for removing the reverse feedback signal from the first feedback signal and transmitting it to the first automatic gain control unit; A first equalizer for removing the distorted signal by the multipath from the negative, a second automatic gain adjusting unit for automatically adjusting the gain of the reverse relay signal to be relayed, the second automatic gain adjusting unit and the external A second feedback signal detector for detecting and updating the phase and magnitude of the feedback signal from the backward relay signal from the second downconverter, a reverse relay signal from the second automatic gain control unit and from the second feedback signal detector A second reverse feedback signal synthesizing unit for generating an inverse feedback signal using the phase and magnitude of the feedback signal, and a feedback signal present in the reverse relay signal from the second downconversion unit from the second inverse feedback signal synthesizing unit; A second feedback signal removing unit for removing the second feedback signal and transmitting it to the second automatic gain control unit by using the feedback signal of the second feedback signal removing unit; The second equalizer for removing the distorted signal by the multi-path of the signal, the original signal generator for providing the original transmission signal required for the first equalizer and the second equalizer from the external synchronization acquisition unit and to be relayed And a control unit for controlling each of the components by using a synchronization signal from an external synchronization acquisition unit and base station information to transmit the forward / reverse relay signal after removing the feedback signal existing in the forward / reverse relay signal. It is done.

In the wireless relay apparatus according to the present invention, the first automatic delay control unit for preventing mutual interference between the feedback signal and the multi-path signal in the forward relay signal and the feedback signal and the multi-path signal present in the reverse relay signal It further comprises a second automatic delay adjusting unit for preventing mutual interference.

In the wireless relay apparatus according to the present invention, the first equalizing unit filters the compensating signal from the first feedback signal removing unit 304 to compensate for the distorted signal and the output of the cross filtering unit and the original signal. And an adaptive coefficient adjusting unit for updating the signal generated by the generating unit through the adaptive algorithm.

In addition, the wireless relay method according to the present invention to achieve the above object is an antenna for transmitting / receiving forward / reverse relay signal to be relayed with a terminal of a base station or service area, forward / reverse relay transmitted / received through the antenna A band pass filter for band filtering the signal, a switching unit for switching forward / reverse relay signals from the band pass filter, a converter for converting the forward / reverse relay signals switched by the switching unit to a baseband signal, the conversion A forward / reverse relay signal converted by the conversion unit according to the synchronization acquisition unit for acquiring synchronization with the terminal of the base station or the service area and the information from the synchronization acquisition unit using the forward / reverse relay signal converted by the unit. Room using a wireless repeater with adaptive playback feedback predictor that removes feedback signal components In. And a compensation step of removing the feedback signal with the adaptive reproduction feedback predictive canceller and compensating for the distorted signal due to the multipath.

In the wireless relay method according to the present invention, the compensation step includes a feedback signal detection step of detecting and updating a phase and magnitude of a feedback signal from a relay signal fed back by adjusting a relay signal and a gain to be relayed and adjusting the gain. Generating an inverted feedback signal using the relayed signal fed back and the feedback signal detected in the feedback signal detecting step and the magnitude of the feedback signal; and inverting the feedback signal existing in the relayed signal to be relayed. A feedback signal removing step of removing the feedback signal generated in the signal generating step, an automatic gain adjusting step of automatically adjusting a gain of the relay signal from which the feedback signal is removed in the feedback signal removing step, and a timing of generating the feedback signal To prevent mutual interference between the feedback signal and the multipath signal in the relay signal Characterized in that it comprises a step.

In addition, to achieve the above object, the recording medium according to the present invention includes an antenna for transmitting / receiving forward / reverse relay signals to be relayed with a terminal of a base station or a service area, and a forward / reverse relay signal transmitted / received through the antenna. A band pass filter for band filtering the switching unit, a switching unit switching a forward / reverse relay signal from the band pass filter, a conversion unit for converting the forward / reverse relay signal switched by the switching unit to a baseband signal, the conversion unit From the forward / reverse relay signal converted by the conversion unit according to the synchronization acquisition unit for obtaining synchronization with the terminal of the base station or the service area using the forward / reverse relay signal converted from Record carrier applied to radio repeater with adaptive playback feedback predictor that removes feedback signal components In the sieve. A feedback signal detecting step of detecting and updating the phase and magnitude of the feedback signal from the relay signal fed back by adjusting the relay signal and the gain to be relayed, and the feedback signal detected by the relay signal and the feedback signal detecting function fed with the gain adjustment A reverse feedback signal generation step of generating a reverse feedback signal using a phase and a magnitude of the signal; a feedback to remove a feedback signal existing in the relay signal to be relayed by using the backward feedback signal generated by the reverse feedback signal generation function In the signal removing step, the distortion signal compensation step of compensating the distorted signal by the multi-path removed in the feedback signal removal function, the original signal generation step of generating the original signal to be used in the distortion signal compensation function and the distortion signal removal function Automatic gain control stage that automatically adjusts the gain of the relay signal without distortion signal Recording a program for realizing characterized in that the computer-readable.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, whereby those skilled in the art may easily implement the technical idea of the present invention. There will be.

In addition, in describing the present invention, when it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

In order to solve the problems as described above, the present invention uses an adaptive playback feedback prediction canceller as shown in FIG. 3 instead of the adaptive feedback prediction canceller shown in FIG.

EMBODIMENT OF THE INVENTION Hereinafter, the structure of this invention is demonstrated according to drawing.

In addition, in description of this invention, the same code | symbol is attached | subjected to the same part and the repeated description is abbreviate | omitted.

3 is a block diagram of an embodiment of an adaptive playback feedback prediction canceller according to the present invention.

As shown in FIG. 3, the adaptive playback feedback predictor canceller includes a first automatic gain adjuster 310 and a first automatic gain adjuster 310 for automatically adjusting a gain of a forward relay signal to be relayed. And a first feedback signal detector 308 and a forward relay signal from the first automatic gain adjuster 310 for detecting and updating a phase and magnitude of the feedback signal from a forward relay signal from an external first down converter. And a first reverse feedback signal synthesizing unit 306 for generating an inverse feedback signal using the phase and magnitude of the feedback signal from the first feedback signal detecting unit 308, and a forward relay signal from the first down conversion unit. The first feedback signal removing unit 304 for removing the feedback signal existing therein by using the backward feedback signal from the first reverse feedback signal synthesizing unit 306 and transferring the feedback signal to the first automatic gain control unit 310. , The first bin A first equalizer 328 for removing the distorted signal by the multipath from the signal remover, a second automatic gain adjuster 322 for automatically adjusting the gain of the reverse relay signal to be relayed, and the second equalizer A second feedback signal detector 320 and the second automatic gain adjuster for detecting and updating a phase and a magnitude of the feedback signal from a reverse relay signal from an automatic gain controller 322 and an external second down converter; A second reverse feedback signal synthesizing unit 318 for generating a backward feedback signal by using a phase and a magnitude of a reverse relay signal from 322 and a feedback signal from the second feedback signal detector 320; A second signal for removing the feedback signal existing in the reverse relay signal from the down-conversion unit by using the backward feedback signal from the second reverse feedback signal synthesizing unit 318 and transferring the feedback signal to the second automatic gain control unit 322. 2 feedback A call remover 316, a second equalizer 330 for removing a distorted signal by multiple paths from the second feedback signal remover 316, and a first equalizer 328 from an external synchronization acquirer. And the original signal generator 326 for providing the original transmission signal required for the second equalizer 330 and the feedback signal removed in the forward / reverse relay signal to be relayed and the distorted signal in the multipath. And a control unit 314 for controlling each of the components by using the synchronization signal from the external synchronization acquisition unit and the base station information to transmit the forward / reverse relay signal.

Here, the synchronization obtaining unit 105 is an essential component necessary for a TDD wireless relay device, and provides a synchronization signal necessary for accurately controlling a signal flow from a base station to a terminal (forward) or a terminal to a base station (reverse). Extract.

This synchronization signal extraction (acquisition) process is to find a signal located at the beginning of the downlink from the base station to the terminal, that is, the preamble. The preamble is structured to efficiently extract the synchronization signal in the TDD scheme, and in the process of acquiring the synchronization signal, base station information such as ID and segment information of the base station may be additionally obtained. As such, when the synchronization acquisition unit 105 obtains the synchronization signal, finds information about the base station, and transmits the information to the control unit 314, the control unit 314 transmits the synchronization signal and the base station received from the synchronization acquisition unit 105. The information is used to control the operation of the TDD wireless relay device.

In particular, the first feedback signal detection unit 308 may determine the feedback signal component and the original signal to be relayed using the base station ID (ID) obtained by the synchronization acquisition unit 105. That is, since the base station ID is composed of a PN code, the phase and magnitude of the feedback signal can be estimated by calculating the correlation value between the base station ID and the forward relay signal.

Therefore, the first feedback signal detection unit 308 between the base station ID (ID) from the control unit 314 and the forward relay signal from the first down converter 103 and the first automatic gain control unit 310 Calculates a correlation value and detects the phase and magnitude of the residual feedback signal present in the forward relay signal, and transmits the detected phase and magnitude to the first reverse feedback signal synthesis unit 306.

The first automatic gain control unit 310 inputs the gain control value according to the magnitude of the forward relay signal input from the first equalizer 328, the current state of the adaptive reproduction feedback prediction canceller, and the control unit 314. The gain value is determined using a predetermined target output magnitude value and a target gain value, and the feedback signal from the first feedback signal removing unit 304 is removed and distorted by the multiple paths in the first equalizer 328. The gain (output signal magnitude) of the compensated forward relay signal is automatically adjusted using the determined gain value.

In addition, the first feedback signal removing unit 304 is a forward relay signal received from the first down converter 103 using the backward feedback signal received from the first backward feedback signal synthesizing unit 306 (a feedback signal). Removes the feedback signal from the signal included therein and transmits the feedback signal to the first equalizer 328.

That is, the first feedback signal removing unit 304 synthesizes the forward relay signal received from the first downconversion unit 103 and the reverse feedback signal input from the first reverse feedback signal synthesizing unit 306 and forwards it. Remove the feedback signal present in the relay signal. The first equalizer 328 compensates for the distorted signal through the signal processing of the original relay signal from the original signal reproducing unit 326.

The distortion compensation according to the present invention will be described in more detail as follows.

The original signal generator 326 generates the promised signals of the transmitter and the receiver through the synchronization acquirer 105, which is required for equalization in the first equalizer 328. Various equalization schemes can be applied in the present invention, and the adaptive equalization scheme will be described as an example.

4 is a diagram illustrating an example of an adaptive equalization scheme.

As shown in FIG. 4, the first equalizer 328 according to the present invention performs the first feedback signal through the filtering process of the cross filter 400 having the coefficient updated by the adaptive coefficient adjuster 401. Compensate for the distorted signal coming from reject 304. The adaptive coefficient adjusting unit 401 updates the coefficient of the output of the traverse filter unit 400 and the signal of the original signal generator 326 through an adaptive algorithm. The signal obtained by the first equalizer 328 becomes an input signal of the first automatic gain adjuster 310.

The first inverse feedback signal synthesizing unit 306 is input from the baseband forward relay signal of which gain is automatically adjusted from the first automatic gain adjusting unit 310 and the first feedback signal detecting unit 308. The inverse feedback signal is generated by adjusting the magnitude and phase of a signal for use in removing the feedback signal existing in the forward relay signal using the phase and magnitude of the feedback signal.

In addition, the control unit 314 uses the synchronization signal received from the synchronization acquisition unit 105 to find the timing of the uplink and downlink to control the signal flow from the base station to the terminal, the terminal to the base station, the synchronization acquisition unit Using the base station information received from 105, a code (for example, base station ID) necessary for detecting the feedback signal is transmitted to the first feedback signal detection unit 308. The synchronization acquisition unit 105 controls the operation of the donor and service switching units 102 and 107 (see FIG. 1) and according to the synchronization acquisition result from the base station to the terminal in the synchronization acquisition unit 105. 314, the first automatic gain control unit 310, the original signal generator 326, the first feedback signal detector 308, the first reverse signal synthesizer 306, and the first feedback signal remover 304. Control the operation of

If the transmission signal is included in the received signal, that is, when the synchronization acquisition unit 105 acquires the synchronization signal and the base station information, the control unit 314 is configured to include the first automatic gain control unit 310 and the first control unit. The first feedback signal detection unit 308, the first reverse feedback signal synthesis unit 306, and the first feedback signal removal unit 304 operate normally. In this case, a target output magnitude value is preset to a specific value and transmitted to the first automatic gain adjuster 310.

On the other hand, when the transmission signal is not included in the received signal, that is, when the synchronization acquisition unit 105 does not acquire the synchronization signal, the control unit 314 is the first automatic gain adjustment unit 310, the first The operation of the first feedback signal detector 308, the first reverse feedback signal synthesizer 306, and the first feedback signal remover 304 is stopped.

On the other hand, the adaptive reproduction feedback prediction canceller for the radio relay apparatus according to the present invention further includes a first automatic delay adjusting unit 312 for preventing mutual interference of the feedback signal and the multipath signal. That is, the first automatic delay adjusting unit 312 is connected to the first automatic gain adjusting unit 310 to adjust the generation delay of the feedback signal so that the feedback signal can be generated at the moment when the multipath signal is not received. For example, the feedback signal can be canceled without the multipath signal and the feedback signal overlapping each other. To this end, the radio relay apparatus confirms in advance the point in time at which the multipath signal is generated, that is, the location of the multipath component. In the uplink, a second automatic delay adjuster 324 having the same function is provided to the second automatic gain adjuster 322.

FIG. 5 is a flowchart illustrating an adaptive feedback prediction cancellation method and a time division duplex (TDD) wireless relay method using the same according to an embodiment of the present invention, and using a feedback signal generated after the first forward signal is relayed To remove the feedback signal remaining in the subsequent forward relay signal.

In the case of the downlink in the TDD radio relay method, a signal received by the adaptive reproduction feedback predictive canceller according to the present invention through a path from the donor antenna 100 to the first downconverter 103 may be provided by the base station. The relay signal transmitted for relaying and the feedback signal from which the signal radiated into the space through the service antenna 109 may be present at the same time, or only the feedback signal including unspecified noise may exist.

The base station transmission signal is represented as a multipath signal by a wireless channel environment, and when only a feedback signal exists in a signal received by the wireless relay device, the transmission signal is not transmitted from the base station to the mobile communication terminal. Since the uplink to the same is the same, only one downlink will be described here.

First, when a signal (forward relay signal) is received through the donor antenna 100, the donor band pass filter 101 performs donor band pass filtering (step 501), and the donor switching unit 102 transmits the forward relay signal. Switching to the first down-converter 103 (step 503) allows the first down-converter 103 to be transmitted. Then, the first down converter 103 down-converts the forward relay signal of the high frequency band to the forward relay signal of the base band (step 505).

Thereafter, the synchronization acquisition unit 105 obtains the synchronization signal for the downlink from the base station to the terminal by using the baseband forward relay signal, obtains information on the base station, and obtains the adaptive reproduction feedback unit shown in FIG. It passes to the control part 314 there (step 507).

If the synchronization signal cannot be obtained here (step 509), the process 507 is repeatedly performed, and if the synchronization acquisition of the downlink is performed by the synchronization acquisition unit 105 (step 509), the controller 314 By operating the first automatic gain control unit 310, the first feedback signal detector 308, the first reverse feedback signal synthesizer 306 and the first feedback signal remover 304, the first feedback signal detector ( In step 308, the phase and magnitude of the feedback signal are updated (step 511).

Accordingly, the first reverse feedback signal synthesizing unit 306 generates the reverse feedback signal using the phase and magnitude of the feedback signal updated by the first feedback signal detecting unit 308 (step 513).

The first feedback signal removing unit 304 combines the baseband forward relay signal and the reverse feedback signal generated by the first reverse feedback signal synthesizing unit 306 to remove the feedback signal included in the forward relay signal. (Step 515).

After the feedback signal is removed from the forward relay signal to be transmitted as described above, the first equalizer 328 compensates the signal distorted by the multipath included in the forward relay signal component (step 517). The first automatic gain adjusting unit 310 automatically adjusts the output magnitude (gain) of the forward relay signal of the signal whose distortion is compensated (step 519).

In this case, the first automatic gain adjusting unit 310 may include a gain adjusting value according to the magnitude of the forward relay signal input from the first feedback signal removing unit 304, the current state of the adaptive feedback prediction canceller, and the controller 314. A gain is determined by using a predetermined target output magnitude value and a target gain value input, and the gain (output signal magnitude) of the forward relay signal from which the feedback signal is removed by the first feedback signal removal unit 304 is determined. Adjust the value automatically.

That is, the magnitude of the forward relay signal is amplified or attenuated to automatically adjust the magnitude of the output signal. Thereafter, the gain-adjusted forward relay signal is up-converted from the first up-converter 106 to a forward relay signal of a high frequency band (step 521), and the service switching unit 107 converts the up-converted forward relay signal into a service band. Switching to the pass filter 108 (step 523), and may be stored on a magneto-optical disk or the like. Since this process can be easily carried out by those skilled in the art will not be described in detail any more.

As mentioned above, although the invention made by this inventor was demonstrated concretely according to the said Example, this invention is not limited to the said Example and can be variously changed in the range which does not deviate from the summary.

According to the wireless relay apparatus and method using an adaptive feedback prediction canceller including the equalizer according to the present invention, the oscillation phenomenon is prevented by adapting to changes in the surrounding environment, thereby improving stability and constant output signal size. It is possible to obtain good C / I by compensating for the distortion of the signal to be relayed at the same time as the advantage of the adaptive adaptive feedback canceller that can be applied to various mobile communication systems while maintaining the quality of service at a certain level. The effect that a highly reliable relay service is possible is obtained.

Claims (10)

An antenna for transmitting / receiving forward / reverse relay signals to be relayed with a base station or a terminal in a service area; A band pass filter for band filtering the forward / reverse relay signal transmitted / received through the antenna; Switching unit for switching the forward / reverse relay signal from the band pass filter, A converter for converting the forward / reverse relay signal switched by the switching unit into a baseband signal; A synchronization acquisition unit for acquiring synchronization with the terminal of the base station or the service area by using the forward / reverse relay signal converted by the conversion unit; An adaptive reproduction feedback prediction canceller for removing the feedback signal component from the forward / reverse relay signal converted by the conversion unit according to the information from the synchronization acquisition unit, The adaptive regenerative feedback prediction canceller A first automatic gain adjusting unit for automatically adjusting a gain of a forward relay signal to be relayed; A first feedback signal detector for detecting and updating a phase and magnitude of a feedback signal from a forward relay signal from the first automatic gain control unit and an external first down converter; A first reverse feedback signal synthesizing unit for generating an inverse feedback signal by using a phase and a magnitude of a forward relay signal from the first automatic gain control unit and a feedback signal from the first feedback signal detector; A first feedback signal for removing the feedback signal existing in the forward relay signal from the first downconverter using the inverse feedback signal from the first inverse feedback signal synthesizing unit and transferring the feedback signal to the first automatic gain control unit; denial, A first equalizer for removing a distorted signal by multiple paths from the first feedback signal remover, A second automatic gain adjusting unit for automatically adjusting a gain of a reverse relay signal to be relayed; A second feedback signal detector for detecting and updating a phase and a magnitude of the feedback signal from a reverse relay signal from the second automatic gain control unit and an external second down converter; A second reverse feedback signal synthesizing unit for generating an inverse feedback signal by using a phase and a magnitude of a reverse relay signal from the second automatic gain control unit and a feedback signal from the second feedback signal detector; A second feedback signal for removing the feedback signal existing in the reverse relay signal from the second downconverter using the inverse feedback signal from the second inverse feedback signal synthesizing unit and transferring the feedback signal to the second automatic gain control unit; denial, A second equalizer for removing the distorted signal by the multipath from the second feedback signal remover, An original signal generator for providing original transmission signals required for the first and second equalizers from the external synchronization acquisition unit; A control unit for controlling each component by using a synchronization signal from an external synchronization acquisition unit and base station information to transmit a forward / reverse relay signal after removing the feedback signal existing in the forward / reverse relay signal to be relayed; Wireless relay device, characterized in that. The method of claim 1, The adaptive reproduction feedback predictive canceller removes the feedback signal and compensates for the distorted signal due to the multipath. delete The method of claim 1, A first automatic delay adjusting unit for preventing mutual interference between the feedback signal and the multipath signal existing in the forward relay signal; And a second automatic delay adjusting unit for preventing mutual interference between the feedback signal and the multipath signal existing in the reverse relay signal. The method of claim 4, wherein The first equalizer includes a cross filter for filtering to compensate for the distorted signal coming from the first feedback signal remover 304; And an adaptive coefficient adjuster for updating the output of the traverse filter and the signal generated by the original signal generator through an adaptive algorithm. An antenna for transmitting / receiving forward / reverse relay signals to be relayed with a terminal of a base station or a service area, a band pass filter for band-filtering forward / reverse relay signals transmitted / received through the antenna, and from the bandpass filter A switching unit for switching forward / reverse relay signals, a converter for converting the forward / reverse relay signals switched by the switching unit to a baseband signal, the base station or the base station using the forward / reverse relay signals converted by the converter; A synchronization acquisition unit for acquiring synchronization with a terminal of a service area and an adaptive reproduction feedback predictor for removing feedback signal components from the forward / reverse relay signals converted by the conversion unit according to information from the synchronization acquisition unit; In the method using a wireless relay device. Compensating for removing the feedback signal with the adaptive reproduction feedback prediction canceller and compensates for the distorted signal due to the multi-path, The compensation step A feedback signal detection step of detecting and updating a phase and a magnitude of a feedback signal from a relayed signal fed back by adjusting a relay signal and a gain to be relayed, Generating a backward feedback signal by using the gain and the feedback of the relayed signal fed back and the feedback signal detected in the feedback signal detecting step; A feedback signal removing step of removing the feedback signal existing in the relay signal to be relayed using the inverse feedback signal generated in the inverse feedback signal generation step; An automatic gain adjustment step of automatically adjusting the gain of the relay signal from which the feedback signal is removed in the feedback signal removing step; And controlling a generation time of the feedback signal to prevent mutual interference between the feedback signal and the multipath signal existing in the relay signal. delete The method of claim 6, A transverse filtering step of filtering to compensate for the distorted signal coming from the first feedback signal removing step; And an adaptive coefficient adjusting step of updating the output of the traverse filtering step and the signal by the original signal generator through an adaptive algorithm. An antenna for transmitting / receiving forward / reverse relay signals to be relayed with a terminal of a base station or a service area, a band pass filter for band-filtering forward / reverse relay signals transmitted / received through the antenna, and from the bandpass filter A switching unit for switching forward / reverse relay signals, a converter for converting the forward / reverse relay signals switched by the switching unit to a baseband signal, the base station or the base station using the forward / reverse relay signals converted by the converter; A synchronization acquisition unit for acquiring synchronization with a terminal of a service area and an adaptive reproduction feedback predictor for removing feedback signal components from the forward / reverse relay signals converted by the conversion unit according to information from the synchronization acquisition unit; A recording medium applied to a wireless relay device. A feedback signal detection step of detecting and updating a phase and a magnitude of a feedback signal from a relayed signal fed back by adjusting a relay signal and a gain to be relayed, Generating an inverted feedback signal using the phase and magnitude of the relay signal fed back by the gain adjustment and the feedback signal detection function; A feedback signal removing step of removing the feedback signal existing in the relay signal to be relayed by using the backward feedback signal generated by the backward feedback signal generating function; A distortion signal compensation step of compensating for a distorted signal by multiple paths removed by the feedback signal removing function; An original signal generating step of generating an original signal to be used in the distortion signal compensation function; And a computer-readable recording medium having recorded thereon a program for realizing an automatic gain adjusting step of automatically adjusting the gain of the relay signal from which the distortion signal is removed by the distortion signal removing function. The method of claim 9, A computer-readable recording medium having recorded thereon a program for adjusting the timing of occurrence of a feedback signal to further prevent mutual interference between the feedback signal and the multipath signal present in the relay signal.

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