KR100961139B1 - High-sensitive signal-detector and method, and smart amplifier and its method, and radio repeating apparatus - Google Patents

Abstract

The present invention relates to a high sensitivity signal detector and a method thereof, a smart amplification apparatus using the same and a method thereof, and a wireless relay system using the same. In the absence of an uplink signal, noise is amplified in the relay system in advance to prevent transmission to the base station, so as not to affect the uplink signal quality between other terminals and the base station. To provide a high-sensitivity signal detector and method, a smart amplification apparatus and method using the same, and a wireless relay system using the same.

To this end, the present invention provides a smart amplifying apparatus, comprising: a band dividing unit for dividing an input signal into bands corresponding to respective FAs; A power detector for detecting a maximum power value for each FA band signal divided by the band divider; A maximum power detector for detecting a maximum power value among a plurality of maximum power values detected by the power detector; A connection level comparison unit for comparing a level of the signal detected by the maximum power detector with a preset access level and outputting a comparison result indicating whether the input signal is a relay target signal or a noise signal; A gain control unit for outputting a first gain control signal if the comparison result from the connection level comparison unit is a relay target signal and for outputting a second gain control signal if the comparison result from the connection level comparison unit is a noise signal; And amplifying and outputting the input signal (relay target signal) according to the first gain control signal from the gain control unit without amplifying the input signal (noise signal) according to the second gain control signal from the gain control unit. It includes an amplifier for.

Wireless relay, uplink, smart amplification unit, high sensitivity signal detection unit, detection of presence of relay target signal, noise signal blocking

Description

High sensitivity signal detector and its method, and smart amplification apparatus and method using the same, and wireless relay system using the same {High-sensitive signal-detector and method, and smart amplifier and its method, and radio repeating apparatus}

The present invention relates to a high sensitivity signal detector and a method thereof, a smart amplification apparatus using the same and a method thereof, and a wireless relay system using the same. By performing the operation, when there is no uplink signal, noise is amplified in the relay system and blocked in advance to be transmitted to the base station, so that the uplink signal quality between other terminals and the base station is not affected. The present invention relates to a high sensitivity signal detector and a method thereof, a smart amplification device using the same, a method thereof, and a wireless relay system using the same.

Meanwhile, in the following embodiments of the present invention, signal transmission from the base station side to the terminal side will be referred to as downlink, and signal transmission from the terminal side to the base station side will be referred to as uplink.

In general, a wireless relay system used in a mobile communication system is installed in a transmission section to service a high quality signal to a mobile communication terminal in a call range. The wireless relay system installed in the transmission section amplifies the gain for each link signal, and the operation of the wireless relay system continues even when there is no signal of each link.

1 is a diagram illustrating an embodiment of an uplink of a general wireless relay system.

As shown in FIG. 1, a general wireless relay system (uplink) includes a service antenna 100 for receiving an uplink relay target signal or a noise signal transmitted from a terminal in another service area or another wireless relay system, and the service antenna. A service band pass filter 101 for filtering a signal of a service band among the signals received at 100, and a down converter 102 for down converting the signal filtered by the service band pass filter 101 to a baseband signal. ), An analog / digital (A / D) converter 103 for converting an analog signal down-converted by the down converter 102 into a digital signal, and the analog / digital (A / D) converter 103 To obtain a relay gain by amplifying the converted digital signal in the amplification unit 104, a digital / analog (D / A) for converting the digital signal from the amplification unit 104 to an analog signal ) An up-conversion unit 106 for up-converting an analog signal converted by the digital / analog (D / A) conversion unit 105, and a signal up-converted by the up-conversion unit 106. A donor band pass filter 107 for filtering the signal, and a donor antenna 108 for transmitting the relay target signal filtered by the donor band pass filter 107 to the base station.

As described above, the relay target signal or the noise signal received by the service antenna 100 may include the service band pass filter 201, the down converter 102, and the analog / digital (A / D) converter 103. Passes through and is converted into a digital signal. Subsequently, the signal converted into the digital signal is amplified by the amplifier 104, and then the digital / analog (D / A) converter 105, the up converter 106, and the donor band pass filter 107. Passed through to the donor antenna (108). Accordingly, the relay target signal or the noise signal is transmitted from the donor antenna 108.

Here, the configuration and operation of the downlink is made of a process contrary to the configuration and operation of the uplink, and since it is known to those skilled in the art, it will not be described herein any further.

In the operation of the radio relay system as described above, the relay target signal is always maintained in the downlink, but may or may not be the relay target signal in the uplink. However, when there is no uplink relay signal, the wireless relay system amplifies a noise signal having no signal source and transmits it to the base station.

Accordingly, the base station receives the amplified and transmitted noise signal and the uplink relay target signal from the other terminal, and the strength between the received signals (amplified noise signal and the relay target signal from the other terminal) Similarly, the amplified noise signal acts as a noise to the relay target signal from the other terminal where the uplink is progressing, thereby degrading signal quality.

In order to solve this problem, a method of acquiring a large signal of a terminal by adopting a function called a sleep mode is used in an indoor miniature relay system. However, the reception level of the remote relay system having a long distance between the terminal and the relay system has a problem in that the sleep mode function cannot be performed because the actual terminal signal level is similar to the noise level.

That is, in the conventional technology as described above, the amplified noise signal in the relay system is transmitted to the base station side, and thus the problem of deteriorating signal quality by acting as a noise to the relay target signal from the other terminal side remains. It is a subject of the present invention.

Therefore, the present invention performs an amplification operation according to the presence or absence of an uplink signal that transmits a signal from the terminal to the base station, so that when the uplink signal is absent, the noise is amplified in the relay system and blocked from being transmitted to the base station in advance. To provide a high-sensitivity signal detector and method, a smart amplification apparatus and method using the same, and a wireless relay system using the same for improving the stability and quality of signal transmission by not affecting the uplink signal quality between the base station and the base station Its purpose is to.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention which are not mentioned can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. Also, it will be readily appreciated that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

In accordance with another aspect of the present invention, there is provided a high-sensitivity signal detector comprising: a band dividing unit for dividing an input signal into bands corresponding to respective frequency assignments; A power detector for detecting a maximum power value for each FA band signal divided by the band divider; A maximum power detector for detecting a maximum power value among a plurality of maximum power values detected by the power detector; And a connection level comparison unit for comparing a level of the signal detected by the maximum power detector with a preset access level, and outputting a comparison result indicating whether the input signal is a relay target signal or a noise signal.

In addition, the method of the present invention for achieving the above object, the high-sensitivity signal detection method, comprising: dividing an input signal into a band (each FA band) corresponding to each FA (Frequency Assignment); Detecting a maximum power value for each of the divided FA band signals; A maximum power detection step of detecting a maximum power value among the detected plurality of maximum power values; And determining whether the input signal is a relay target signal or a noise signal by comparing a level of the signal detected in the maximum power detection step with a preset access level.

On the other hand, another apparatus of the present invention for achieving the above object, Smart amplification device, the band divider for dividing the input signal into a band corresponding to each FA; A power detector for detecting a maximum power value for each FA band signal divided by the band divider; A maximum power detector for detecting a maximum power value among a plurality of maximum power values detected by the power detector; A connection level comparison unit for comparing a level of the signal detected by the maximum power detector with a preset access level and outputting a comparison result indicating whether the input signal is a relay target signal or a noise signal; A gain control unit for outputting a first gain control signal if the comparison result from the connection level comparison unit is a relay target signal and for outputting a second gain control signal if the comparison result from the connection level comparison unit is a noise signal; And amplifying and outputting the input signal (relay target signal) according to the first gain control signal from the gain control unit without amplifying the input signal (noise signal) according to the second gain control signal from the gain control unit. It includes an amplifier for.

In addition, another method of the present invention for achieving the above object, Smart amplification method, comprising: dividing an input signal into a band (each FA band) corresponding to each FA; Detecting a maximum power value for each of the divided FA band signals; A maximum power detection step of detecting a maximum power value among the detected plurality of maximum power values; A determination step of determining whether the input signal is a relay target signal or a noise signal by comparing a level of the signal detected in the maximum power detection step with a preset access level; Outputting a first gain control signal if the determination result in the determination step is a relay target signal, and outputting a second gain control signal if the determination result in the determination step is a noise signal; And amplifying the input signal (relay target signal) according to the first gain control signal without amplifying the input signal (noise signal) according to the second gain control signal.

On the other hand, the system of the present invention for achieving the above object, the wireless relay system, pre-processing means for receiving and pre-processing a signal relayed through the uplink; A band dividing unit for dividing the received signal pre-processed by the pre-processing unit into bands corresponding to respective FAs; A power detector for detecting a maximum power value for each FA band signal divided by the band divider; A maximum power detector for detecting a maximum power value among a plurality of maximum power values detected by the power detector; A connection level comparison unit for comparing a level of the signal detected by the maximum power detector with a preset access level and outputting a comparison result indicating whether the received signal is a relay target signal or a noise signal; A gain control unit for outputting a first gain control signal if the comparison result from the connection level comparison unit is a relay target signal and for outputting a second gain control signal if the comparison result from the connection level comparison unit is a noise signal; For amplifying and outputting the received signal (relay target signal) according to the first gain control signal from the gain control unit without amplifying the received signal (noise signal) according to the second gain control signal from the gain control unit. Amplification unit; And post-processing means for post-processing and transmitting the relay target signal amplified by the amplifier.

The present invention as described above, by performing the amplification operation according to the presence or absence of the uplink signal to transmit a signal from the terminal to the base station, in the absence of the uplink signal to amplify the noise in the relay system to be transmitted to the base station in advance In other words, by not affecting the uplink signal quality between other terminals and the base station, it is possible to improve the stability of signal transmission and the quality of service.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of the present invention when taken in conjunction with the accompanying drawings, It can be easily carried out. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

In general, a relay system includes an RF relay system, an interference cancellation relay system (ICS), and other relay systems according to a multiple access method, a modulation scheme, or a function, but a common target is amplification of a relay target signal. Accordingly, in the following description of the present invention, a relay system having a simple amplification function and a digital signal processing function will be described as an example, but the present invention is not limited thereto, and it is natural that the present invention is applicable to the above-mentioned relay system. something to do.

 Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a diagram illustrating an embodiment of an uplink of a wireless relay system according to the present invention.

As shown in FIG. 2, the wireless relay system (uplink) according to the present invention includes a service antenna 200 for receiving an uplink relay target signal or a noise signal transmitted from a terminal or another wireless relay system in a service area, A service band pass filter 201 for band-filtering a signal of a service band among the signals received by the service antenna 200, and a downlink for down-converting the signal filtered by the service band pass filter 201 to a baseband signal. An analog / digital (A / D) converter 203 and the analog / digital (A / D) converter for converting the analog signal down-converted by the down-converter 202 into a digital signal Amplifying the relay target signal by determining whether the digital signal converted in the unit 203 is an uplink relay target signal or a noise signal, that is, whether or not the relay target signal is present; Smart amplification unit 204 for blocking the sound signal is amplified and transmitted, Digital / Analog (D / A) conversion unit 205 for converting the digital signal from the smart amplification unit 204 to an analog signal, An up-converter 206 for up-converting the analog signal converted by the digital / analog (D / A) converter 205 and a donor band for band-filtering the up-converted signal at the up-converter 206 A pass filter 207 and a donor antenna 208 for transmitting the relay target signal filtered by the donor band pass filter 207 to the base station.

3 is a detailed block diagram of an embodiment of the smart amplifier shown in FIG.

As shown in FIG. 3, the smart amplifier 204 according to the present invention is a signal to be relayed by the digital signal from the analog / digital (A / D) converter 203 (relay target signal = call signal). ) Or a high-sensitivity signal detector 300 for distinguishing and detecting whether a signal is a noise signal, and outputting a first gain control signal if the signal detection result from the high-sensitivity signal detector 300 is a relay target signal. If the signal detection result from 300 is a noise signal, the gain control unit 301 for outputting the second gain control signal and the analog / digital (A / D) signal according to the second gain control signal from the gain control unit 301. ) The relay target signal from the analog / digital (A / D) converter 203 according to the first gain control signal from the gain controller 301 without amplifying the noise signal from the converter 203. Amplify And an amplifier 302 for outputting to the digital / analog (D / A) converter 205.

Here, the gain control unit 301 may be simply implemented using a timer as an example. For example, if the signal detection result from the high sensitivity signal detection unit 300 is a relay target signal, a timer ON signal is output. If the signal detection result from the high sensitivity signal detection unit 300 is a noise signal, the timer is turned off. OFF) signal is output.

As described above, the smart amplification unit 204 having a function of determining the presence or absence of the relay target signal and amplifying the relay target signal or blocking the noise signal will be described in detail with reference to FIG. 4.

4 is a timing diagram for explaining the relationship between the input signal of the high sensitivity signal detection unit, the output signal of the gain control unit, and the output signal of the amplification unit.

That is, FIG. 4A is a timing diagram of an input signal of the high sensitivity signal detector 300, FIG. 4B is a timing diagram of an output signal of the gain controller 301, and FIG. Is a timing diagram for the output signal of the amplifier 302.

When the input signal of the high sensitivity signal detection unit 300 shown in FIG. 4A is greater than or equal to an access level, it is determined that uplink is performed. Assuming that the input signal (a in FIG. 4) of the high sensitivity signal detector 300 is a noise signal up to a point before t1, the output signal (b in FIG. 4) of the gain control unit 301 is output as a timer OFF signal. The amplifier 302 adjusts the gain to zero as shown in FIG. 4C according to the timer OFF signal from the gain controller 301.

On the other hand, if the input signal (a in FIG. 4) of the high sensitivity signal detection unit 300 is detected at an access level or more at a point t1, the output signal (b in FIG. 4) of the gain control unit 301 is a predetermined time (eg : One minute duration per call, t2-t1) is output as timer ON signal. When the output signal of the gain control unit 301 is in the timer ON state, the amplifying unit 302 is shown in FIG. 4C according to the timer ON signal from the gain control unit 301. Increase the gain by the target gain as shown. As described above, in the present invention, it is assumed that the call is made unconditionally during the period t2-t1, and the gain of the amplifier 302 is increased so that the signal (relay target signal) to be relayed is transmitted to the base station.

When the predetermined time t2-t1 ends at the time t2, the state of the timer signal from the gain control unit 301 is changed to the OFF state, and the amplifying unit 302 gradually decreases the gain.

At this time, if the uplink continues, the base station receiving the signal whose gain is reduced transmits a signal to the terminal to send a strong signal strength. Accordingly, the terminal transmits a stronger signal, and the strong signal from the terminal is detected as a signal higher than an access level in the input signal of the high sensitivity signal detector 300 (t3 in FIG. 4a). Point), and thus the timer signal state from the gain control unit 301 is changed back to an ON state, and the amplification unit 302 increases the gain again.

If all of the calls are made during the predetermined period (t2-t1), the input signal of the high sensitivity signal detector 300 maintains the signal strength below the access level (noise signal level), and accordingly The output signal of the gain control unit 301 is also kept in the timer OFF state, and accordingly, the gain of the amplifying unit 302 gradually decreases and then switches to zero.

5 is a detailed configuration diagram of an embodiment of the high sensitivity signal detection unit 300 shown in FIG. 3.

As shown in FIG. 5, the high sensitivity signal detection unit 300 according to the present invention converts a digital signal from the analog / digital (A / D) conversion unit 203 into a band corresponding to each frequency assignment (FA). A band divider 500 for dividing, a power detector 501 for detecting a maximum power value for each FA band signal divided by the band divider 500, and a maximum detected by the power detector 501 Among the power values, the maximum power detector 502 for detecting the maximum power value and the level of the signal detected by the maximum power detector 502 are compared with a preset access level, and a comparison result (detection signal And a connection level comparison unit 503 for outputting the signal to be relayed if the level is greater than or equal to the connection level and a noise signal if the detected signal level is less than the connection level.

Here, the band dividing unit 500 may be implemented by using a plurality of band pass filters (BPFs) for filtering a band corresponding to one frequency assignment (FA). That is, by filtering the corresponding FA band by using a BPF one-to-one corresponding to each FA (Frequency Assignment) band, the digital signal from the analog / digital (A / D) converter 203 corresponds to each FA. Divide into

The power detector 501 may be implemented by using a plurality of power detectors for detecting a maximum power value from one FA band signal. That is, a maximum power value of the corresponding FA band signal is detected by using a power detector corresponding to each FA (Frequency Assignment) band signal one-to-one.

As described above, a signal to be relayed (a relay target signal) or a noise signal is received through the service antenna 200, and the received signal is a service band pass filter 201, a down converter 202, and an analog signal. The signal is input to the high sensitivity signal detector 300 through the digital to digital converter 203. The input signal input to the high sensitivity signal detector 300 is divided into each FA band through a BPF corresponding to each FA, and then a maximum power value corresponding to each FA is detected by each corresponding power detector.

Here, finding the maximum power value of the entire band of the input signal is difficult to distinguish the access level (actual uplink) is made because the high noise floor (NF) level (level) is high. Therefore, as described above, by dividing the entire input signal band for each FA to lower the NF level, more accurate maximum power value for each FA can be detected by each power detector.

Among the maximum power values detected by each power detector, the maximum power value is detected by the maximum power detector 502, and whether an uplink signal is generated or not, that is, whether the input signal is a relay target signal or a noise signal. (access level) After comparing in the comparison unit 503, and transmits the comparison result signal to the gain control unit (301).

Then, the gain control unit 301 outputs a timer ON signal or a timer OFF signal to the amplifier 302 according to the comparison result signal from the access level comparison unit 503. At this time, if the comparison result signal from the connection level comparison unit 503 is a "signal indicating that the input signal is a relay target signal", the gain control unit 301 sends the timer ON signal to the amplifier unit 302 for a predetermined time. After the predetermined time has elapsed, the timer OFF signal is output to the amplifier 302.

Then, the amplifier 302 sets the gain to the target gain or sets it to 0 according to the timer ON signal or the timer OFF signal from the gain controller 301. That is, when there is an uplink signal, the amplifying unit 302 amplifies the relay target signal and transmits the signal to the base station, or blocks the noise signal. The signal transmitted to the base station is transmitted through the digital / analog (D / A) converter 205, the up converter 206, the donor band pass filter 207, and the donor antenna 208.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the technical spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by the drawings.

The present invention can be used in RF relay system, interference elimination relay system (ICS), other relay system and the like.

1 is a configuration diagram of an embodiment of an uplink of a general wireless relay system;

2 is a diagram showing an embodiment of an uplink of a wireless relay system according to the present invention;

3 is a detailed configuration diagram of an embodiment of the smart amplifier shown in FIG. 2;

4 is a timing diagram for explaining a relationship between an input signal of a high sensitivity signal detection unit, an output signal of the gain control unit, and an output signal of the amplification unit;

FIG. 5 is a detailed configuration diagram of an embodiment of the high sensitivity signal detector illustrated in FIG. 3.

* Explanation of symbols for the main parts of the drawings

204: smart amplifier 300: high sensitivity signal detector

301: gain control unit 302: amplification unit

500: band divider 501: power detector

502: maximum power detection unit 503: connection level comparison unit

Claims (12)

In the high sensitivity signal detector, A band dividing unit for dividing an input signal into bands corresponding to each frequency assignment; A power detector for detecting a maximum power value for each FA band signal divided by the band divider; A maximum power detector for detecting a maximum power value among a plurality of maximum power values detected by the power detector; And A connection level comparison unit for outputting a comparison result indicating whether the input signal is a relay target signal or a noise signal by comparing the level of the signal detected by the maximum power detector with a preset access level High sensitivity signal detector comprising a. The method of claim 1, The band division unit, A high sensitivity signal detector, characterized by dividing the input signal into bands corresponding to each FA by filtering corresponding FA bands by using a plurality of band pass filters (BPFs) corresponding to each FA band one-to-one. The method according to claim 1 or 2, The power detector, And a maximum power value for each corresponding FA band signal using a plurality of power detectors corresponding to each FA band signal one to one. In the high sensitivity signal detection method, Dividing an input signal into bands (each FA band) corresponding to each FA (Frequency Assignment); Detecting a maximum power value for each of the divided FA band signals; A maximum power detection step of detecting a maximum power value among the detected plurality of maximum power values; And Comparing the level of the signal detected in the maximum power detection step with a predetermined access level to determine whether the input signal is a relay target signal or a noise signal; High sensitivity signal detection method comprising a. delete In the smart amplification device, A band divider for dividing the input signal into bands corresponding to each FA; A power detector for detecting a maximum power value for each FA band signal divided by the band divider; A maximum power detector for detecting a maximum power value among a plurality of maximum power values detected by the power detector; A connection level comparison unit for comparing a level of the signal detected by the maximum power detector with a preset access level and outputting a comparison result indicating whether the input signal is a relay target signal or a noise signal; A gain control unit for outputting a first gain control signal if the comparison result from the connection level comparison unit is a relay target signal and for outputting a second gain control signal if the comparison result from the connection level comparison unit is a noise signal; And For amplifying and outputting the input signal (relay target signal) according to the first gain control signal from the gain control unit without amplifying the input signal (noise signal) according to the second gain control signal from the gain control unit. Amplifier Smart amplification device comprising a. The method of claim 6, The gain control unit, And outputting a timer ON signal if the comparison result from the connection level comparison unit is a relay target signal, and outputting a timer OFF signal if the comparison result from the connection level comparison unit is a noise signal. Smart amplification device. delete In the smart amplification method, Dividing the input signal into bands (each FA band) corresponding to each FA; Detecting a maximum power value for each of the divided FA band signals; A maximum power detection step of detecting a maximum power value among the detected plurality of maximum power values; A determination step of determining whether the input signal is a relay target signal or a noise signal by comparing a level of the signal detected in the maximum power detection step with a preset access level; Outputting a first gain control signal if the determination result in the determination step is a relay target signal, and outputting a second gain control signal if the determination result in the determination step is a noise signal; And Amplifying the input signal (relay target signal) according to the first gain control signal without amplifying the input signal (noise signal) according to the second gain control signal. Smart amplification method comprising a. delete delete In a wireless relay system, Preprocessing means for receiving and preprocessing a signal relayed through the uplink; A band dividing unit for dividing the received signal pre-processed by the pre-processing unit into bands corresponding to respective FAs; A power detector for detecting a maximum power value for each FA band signal divided by the band divider; A maximum power detector for detecting a maximum power value among a plurality of maximum power values detected by the power detector; A connection level comparison unit for comparing a level of the signal detected by the maximum power detector with a preset access level and outputting a comparison result indicating whether the received signal is a relay target signal or a noise signal; A gain control unit for outputting a first gain control signal if the comparison result from the connection level comparison unit is a relay target signal and for outputting a second gain control signal if the comparison result from the connection level comparison unit is a noise signal; For amplifying and outputting the received signal (relay target signal) according to the first gain control signal from the gain control unit without amplifying the received signal (noise signal) according to the second gain control signal from the gain control unit. Amplification unit; And Post-processing means for post-processing and transmitting the relay target signal amplified by the amplifier Wireless relay system comprising a.

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