KR100462827B1 - Haulingless RF Repeater and Method thereof - Google Patents

Abstract

A radio repeater using a radio frequency, comprising: a first receiving aerial unit and a second receiving aerial unit for receiving a radio signal, differentially synthesizing a signal received through a first receiving aerial unit and a second receiving aerial unit, and performing a differentially synthesized signal The orthogonal signal delayed by 1/4 wavelength and the first and second received signals are synthesized at an appropriate ratio to remove the near-field interference signal in phase, and the delayed reflection interference signal that is not removed by the phase method is High power zero oscillation repeater and multiple signal synthesis ratios and delay factors that completely eliminate interference signals correlated with transmission of the repeater by secondary synthesis of half-phase transmit signals with appropriate temporal delay and magnitude for the transmitted signal Correlation signal based on correlation detection amount according to output change and artificial output change according to By repeatedly adjusting the adjustment element until the amount is to be minimized is a non-oscillating a radio relay method for removing all interference and consequently amplifies, and transmits only the emergency inertial signal.

Description

No oscillating wireless repeater and no oscillating wireless relay method

The present invention relates to a relay apparatus and a relay method for use in a wireless communication method, and more particularly, to a relay apparatus and a relay method for relaying high power and high purity radio signals by increasing a correlation isolation between transmission and reception of a relay base station. It is about.

A repeater is a device for providing good call quality to buildings inside and outside areas where radio waves cannot reach by amplifying low received signal level to a level of good call quality, which is located between a base station and a terminal station. Say.

Types of repeaters include optical repeaters, microwave repeaters, variable wave repeaters, RF repeaters, etc. The present invention relates to an RF repeater.

In the case of RF repeater, the economical efficiency is excellent, but there are many limitations in the installation due to the problem of separation between transmission and reception and increase of base station noise.

Therefore, in the prior art, although the shielding obstacles of the transmitting and receiving aerials are installed to improve the correlation spacing of the relay base station, or the space separation is performed, the frequency conversion relay and the phase signal processing method are used in the smart antenna technology. There is a problem that requires a low cost and expensive signal processing device.

Therefore, the present invention devised to solve the above problems, in the wireless communication, a wireless relay device and a wireless relay to effectively control the feedback phenomenon that occurs during high power transmission for the expansion of the service area and the quality improvement of the shadow area It is an object to provide a method.

1 is a conceptual diagram of correlation detection according to the present invention.

2 is a graph according to the size of the gain modulation according to the present invention.

3 is a block diagram of an oscillation-free wireless relay device showing a configuration of an embodiment according to the present invention.

4 is a block diagram of a simulator according to the present invention.

5 is a configuration diagram of a gain modulator according to the present invention.

6 is a graph showing the principle of interference signal cancellation according to the present invention.

Figure 7 is a position view of the aerial portion for removing the interference signal according to the present invention.

8 is a flow chart of a zero oscillation wireless relay method according to the present invention.

Figure 9 is a flow chart of the orthogonal signal generation step of the zero oscillation wireless relay method according to the present invention.

10 is a flow chart of the interference control signal synthesis step of the oscillation-free wireless relay method according to the present invention.

*** Explanation of symbols for main parts of drawing ***

10: receiving antenna 20: transmitting antenna

30: feedback radio signal 100: no oscillation relay device

110: donor base station 120: first receiving aerial unit

125: subtraction signal generator 130: second receiving aerial portion

135: orthogonal subtraction signal generator 140: first simulator

145: interference control signal synthesis unit 147: feedback gain detector

150: second simulator 155: selection control unit

160 filter unit 170 gain modulator

172: output protector 174: gain modulator

176: gain detector 180: transmission amplifier

190: transmitting aerial unit 200: terminal station

f0: Remote donor base station signal f1: Receive signal of first receiving aerial part

f2: second received aerial portion received signal f3: orthogonal subtraction signal

n1: near interference signal n2: reflection interference signal

The present invention for achieving the above object, relates to a wireless repeater using a radio frequency, comprising a first receiving aerial unit and a second receiving aerial unit for receiving a radio signal, the first receiving aerial unit and the second receiving aerial unit Differentially synthesize the received signal, synthesize the quadrature-delayed orthogonal signal with the first and second received signals at an appropriate ratio, and remove the near-field interference signal in phases, The time-delayed reflection interference signal, which is not eliminated in a phased manner, is a high power output that completely eliminates the interference signal correlated with the transmission of the repeater by secondly synthesizing the half-phase transmission signal having an appropriate time delay and magnitude for the transmission signal. Output change and artificial output change due to the change of the duty-free oscillator and the number of signal synthesis ratios and delay factors Correlation detection amount according to the relative angle by adjusting the adjustment element repeatedly until the amount of the washing inertia signals to be minimized is a non-oscillating a radio relay method for removing all interference signals are consequently amplified and transmits only the non-correlation signal.

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

1 is a conceptual diagram of correlation detection according to the present invention.

As shown in FIG. 1, the basic principle of eliminating the short-range interference signal and the reflection interference signal of the present invention, the oscillation-free relay apparatus in the transmission gain modulator for modulating the transmission gain of the radio signal received through the receiving antenna 10 The transmission gain of the received radio signal is modulated to transmit a gain-modulated radio signal through the transmission antenna 20, and the transmission gain is determined according to the feedback gain of the feedback signal 30.

The feedback signal 30 is transmitted through the transmitting antenna 20, and the transmitted radio signal is received again through the receiving antenna 10.

Here, the feedback gain of the feedback wireless signal is detected through the feedback gain detector for detecting the feedback gain of the feedback signal 30 received through the receiving antenna 10.

The correlation is measured through the ratio of the transmission gain and the feedback gain.

It may be determined whether the radio signal is properly relayed according to the measured correlation.

2 is a graph according to the magnitude of the gain modulation according to the present invention.

As shown in FIG. 2, the principle of eliminating the short range interference signal and the reflection interference signal of the inventors of the non-oscillating wireless relay apparatus will be described in detail with reference to the graph.

In the graph, P is power and T is time.

When the transmission gain modulator of FIG. 1 modulates the gain by D1 and transmits it, and the gain of the feedback gain detector of FIG. 1 detects the gain of D2,

Correlation C = D2 (Return Gain) / D1 (Transmission Gain)

It is possible to measure the value through, and it is possible to know whether the wireless repeater properly relays the original signal without noise according to the measured value correlation degree C.

As a result, the smaller the correlation C value, the smaller the radio signal relay relays the received source signal without distortion caused by interference.

3 is a block diagram of the oscillation-free relay device showing the configuration of an embodiment according to the present invention.

As shown in FIG. 3, the present invention-free oscillating relay device 100 includes a first receiving aerial unit 120 and a subtraction signal generating unit 125 for receiving an original signal and an interference signal output from the donor base station 110. ), The second receiving aerial unit 130, the orthogonal subtraction signal generator 135, the first simulator 140, the second simulator 150, the selection controller 155, the filter unit 160, the gain modulation unit ( 170, a transmission amplifier 180 and a transmission aerial 190.

The first receiving aerial unit 120 and the second receiving aerial unit 130 receive the original signal from the donor base station 110 at a distance, and at the same time, the near field interference which is a feedback signal of the transmitting aerial unit 190 of the repeater itself. A signal n1 and a reflection interference signal n2 that is a feedback signal reflected by an external object are received.

The original signal transmitted from the remote donor base station 110 is received in substantially the same phase through the first receiving aerial unit 120 and the second receiving aerial unit 130.

Therefore, when synthesizing the received original signal, the amplitude is doubled, and when it is subtracted, it has the characteristics of a canceled signal.

In addition, the near-field interference signal n1 input from the transmitting aerial unit 190 of the repeater itself receives a signal having a phase difference corresponding to the distance between the first receiving aerial unit 120 and the second receiving aerial unit 130. do.

The subtraction signal generating unit 125 receives the radio signals received from the first receiving aerial unit 120 and the second receiving aerial unit 130, and cancels the original phase signals in phase by a subtraction synthesis method. Only input interference signal is extracted.

The orthogonal subtraction signal generator 135 delays the phase of the interference signal extracted by the subtraction signal generator 125 by 1/4 wavelength to generate an orthogonal subtraction signal.

The generation of the orthogonal subtraction signal is for converting a phase difference generated by reflection interference between the received signal of the first receiving aerial unit 120 and the received signal of the second receiving aerial unit 130 to an accurate inverted phase difference.

The first simulator 130 and the second simulator 140 may include the first reception aerial unit 120, the second reception aerial unit 130, the subtraction signal generation unit 125, and the orthogonal subtraction signal generation unit 135. The radio signals received from the synthesizer are synthesized at an undetermined ratio.

Hereinafter, a detailed description will be given in FIG. 4.

The selection controller 155 measures the correlation in each simulator for the gain modulated by the gain modulator 170, opens a relatively small simulator according to the measured correlation, and has a relatively high correlation. The simulator has a close swapping function.

If the first simulator 140 is opened, the first simulator synthesizes and outputs a signal received at a fixed synthesis ratio, and the second simulator 150 continuously measures the correlation in the closed state.

Here, when the correlation value of the unknown synthesis ratio of the second simulator is smaller than the correlation value of the fixed synthesis ratio of the first simulator, the first simulator 140 is closed and the second simulator 150 is open. At the same time, the unspecified synthesis rate is synthesized with a signal received at a fixed synthesis rate.

The filter unit 160 is for removing the noise signal generated internally through the simulator and the selection control unit 155.

Therefore, the noise signal included in the signal output through the selection controller 155 is removed while passing through the filter unit 160.

The gain modulator 170 modulates the amplitude of the output by using an orthogonal signal string such as a pseudo noise string code that has already been determined with a fine feedback signal that is not removed from the simulator, and modulates the modulated signal with the feedback signal. The correlation is detected through the amplitude modulation ratio, and the transmission power is added or subtracted until the reception strength of the orthogonal signal sequence due to the correlation detection becomes zero.

Hereinafter, a detailed description will be given in FIG. 5.

The transmission amplifier 180 amplifies a signal to transmit a signal from which an interference signal and a noise signal are removed.

The transmission aerial unit 190 receives the signal amplified by the transmission amplification unit 180 and radiates to the free space for transmission to the terminal station 200.

4 is a block diagram of a simulator according to the present invention.

As shown in FIG. 4, the first simulator and the second simulator include an interference control signal synthesizing unit 145 and a feedback gain detector 147.

The interference control signal synthesizing unit 145 is a wireless signal received through the first receiving aerial unit 120 and the second receiving aerial unit 130, the interference signal and the orthogonal subtraction that is the output signal of the subtraction signal generator 125 The orthogonal subtraction signal, which is the output of the signal generator 135, is input, and the received signals are undetermined according to the correlation measured by the modulation amount of the gain modulator 170 and the feedback gain measured by the feedback gain detector 147. Synthesize at the ratio of.

The feedback gain detector 147 detects the feedback gain of the signal synthesized and output through the simulator.

5 is a block diagram of a gain modulator according to the present invention.

As shown in FIG. 5, the gain modulator 170 according to the present invention includes an output protector 172, a gain modulator 174, and a gain detector 176.

The output protector 172 increases the transmission gain indefinitely, thereby preventing the current gain according to the transmission output and the radio signal amplification from increasing indefinitely.

The output protector 172 sets a constant transmission gain limit. When the gain reaches a certain limit, the output protector 172 reduces the gain to reduce the transmission output of the radio signal.

The gain modulator 174 modulates the transmission gain by modulating the amplitude of the radio signal transmitted from the repeater by a certain amount.

The gain detector 176 detects a gain of a signal that is amplitude-modulated to a predetermined magnitude in the gain modulator 174.

The transmission gain and the feedback gain measured by the feedback gain detector 147 of each simulator serve as the basis for measuring the correlation.

6 is a graph illustrating an interference signal cancellation principle according to the present invention.

The radio signal received from the remote donor base station 110 has little phase difference with the radio signal received through the first receiving aerial unit 120 and the second receiving aerial unit 130.

As shown in FIG. 6, the interference signal includes a near-field interference signal n1 directly received from the transmitting aerial portion of the repeater and an indirect interference signal n2 received by being reflected by an external object.

Since the near field interference signal n1 has a phase difference as far as the aerial portion falls, when the distance between the aerial portions is 1/2 wavelength of the transmission signal wavelength, the near interference signal received by the aerial portion differs by half wavelength.

Accordingly, the received near interference signal n1 has a characteristic that the amplitude is doubled when synthesized, and the amplitude is zero when subtracted.

Therefore, the short-range interference signal n1 received by the first receiving aerial unit 120 and the second receiving aerial unit 130 synthesizes and cancels the signal.

Since the indirect interference signal is received by being reflected by an object in proximity, the indirect interference signal has a specific acute angle.

As a result, the interference signal received by the first receiving aerial unit 120 and the second receiving aerial unit 130 generates a phase difference φ1 corresponding to a specific acute angle of the indirect interference signal.

Using such a feature, the subtraction signal generator 125 subtracts the received radio signal to extract only the interference signal, and the orthogonal subtraction signal generator 135 delays the phase of the extracted interference signal by 1/4 wavelength. An orthogonal signal f3 is generated and transmitted to the interference control signal synthesizing unit 145.

In the interference control signal synthesizing unit 145, a radio signal received by the first reception aerial unit 120, a radio signal received by the second reception aerial unit 130, an interference signal of the subtraction signal generator 125, and The orthogonal subtraction signal f3 of the orthogonal subtraction signal synthesizing unit 135 is synthesized at an appropriate ratio, and after synthesis, phase shifting (φ2) according to the orthogonal subtraction signal is removed to remove all interference signals that are not in phase. .

In this case, the proper ratio is a ratio of synthesizing the signal input to the interference control signal synthesizing unit 145 and synthesizes the signal in various ratios, and determines the ratio of the smallest amplitude value among the synthesized signals at the undetermined ratio. Determine in percentage.

This allows continuous tracking and elimination of interference signals.

7 is a position view of the aerial portion for removing the interference signal according to the present invention.

As shown in FIG. 7, the first receiving aerial unit 120, the second receiving aerial unit and the transmitting aerial unit 190 are positioned at an interval of 1/2 wavelength of the transmission signal so that the received feedback signal Ensure that the signal received by the receiving aerial is in reverse phase.

In addition, in order to generate an accurate orthogonal subtraction signal, the first reception aerial unit 120, the second reception aerial unit and the transmission aerial unit 190 are connected by wire to receive a transmission signal by wire rather than wirelessly.

Referring to the operation of the embodiment according to the present invention configured as described above are as follows.

8 is a flow chart of the oscillation-free relay method according to the invention.

As shown in FIG. 8, the oscillation-free relay method includes a radio signal reception step S100, an orthogonal signal generation step S200, a transmission correlation detection step S300, an interference control signal generation step S400, and a transmission gain modulation step. (S500), the filtering step (S600), the transmission signal amplification step (S700) and the transmission step (S800).

The radio signal receiving step S100 may include a radio signal f0 transmitted from the donor support station 110 and a near interference signal n1 of the transmitting aerial unit 190 of the repeater and an indirect interference signal n2 reflected by an external object. ).

The orthogonal signal generating step (S200) extracts an interference signal by subtracting the signal received in the wireless signal receiving step (S100), delays the extracted interference signal by a quarter by orthogonal subtraction signal (f3). Will occur).

Hereinafter, a detailed description will be given with reference to FIG. 9.

The transmission correlation detecting step S300 detects a feedback gain of the received radio signal by feeding back a radio signal modulated with a constant amplitude in a transmission gain modulation step S500.

The interference control signal synthesizing step S400 receives and synthesizes the radio signal received in the radio signal receiving step S100 and the orthogonal subtraction signal f3 generated in the orthogonal signal generating step S200, and removes the interference signal. .

Hereinafter, a detailed description will be given with reference to FIG. 10.

The transmission gain modulation step (S500) modulates the amplitude of the radio signal with a constant magnitude in order to measure the correlation.

Correlation can be measured through the feedback gain of the step and the feedback gain of the transmission correlation detection step (S300).

The filtering step S600 removes a noise signal generated through the orthogonal subtraction signal generation step and the interference control signal synthesis step to remove the interference signal.

The transmission signal amplifying step (S700) amplifies the signal in order to transmit the received signal to the terminal station 200.

The transmitting step S800 radiates the amplified signal to the free space through the transmission signal amplifying step S700.

9 is a flowchart of an orthogonal signal generation step S200 of the oscillation-free relay method according to the present invention.

As shown in FIG. 9, the orthogonal signal generation step S200 includes a reception signal subtraction step S210, an in-phase signal cancellation step S220, an interference signal extraction step S230, and an interference signal delay step S240. .

The received signal subtraction step S210 subtracts the signal received in the wireless signal reception step S100.

The in-phase signal canceling step S220 cancels the in-phase signal among the signals that have passed through the received signal subtraction step S210.

In the interference signal extracting step S230, since the phases are not the same, the interference signal not canceled in the in-phase signal canceling step S220 is extracted.

The interference signal delay step S240 delays the interference signal extracted in the interference signal extraction step S230 by a quarter wavelength to generate an orthogonal subtraction signal f3.

10 is a flow chart of the interference control signal synthesis step (S300) of the zero oscillation relay method according to the present invention.

As shown in FIG. 10, the interference control signal synthesizing step S400 includes a signal synthesizing step S410 for synthesizing a signal at an undetermined ratio, a correlation measuring step S420 for measuring a correlation of the synthesized signal, and a correlation diagram. The comparison consists of comparing the comparison step (S430), the synthesis ratio selection step of selecting the synthesis ratio of the minimum correlation (S440) and the synthesis ratio maintenance step (S450).

The signal synthesizing step (S410) synthesizes the orthogonal subtraction signal generated in the orthogonal subtraction signal generation step (S200) and the signal received in the wireless signal receiving step (S100) at a predetermined constant synthesis ratio.

The correlation measure step S420 measures the correlation of the signal synthesized at a predetermined ratio in the signal synthesis step S410.

The correlation comparison step (S430) compares the correlation measured through the correlation measurement step (S420) to find a minimum correlation.

The synthesis ratio selection step S440 selects a synthesis ratio having a minimum correlation from the correlations compared in the correlation comparison step S430.

In the synthesis ratio maintaining step S450, the synthesis ratio selected in the synthesis ratio selection step S440 is maintained to synthesize a signal.

Although the present invention described above has been described in detail only with respect to the specific examples described, it will be apparent to those skilled in the art that various modifications and variations are possible within the technical spirit of the present invention, and such modifications and modifications belong to the appended claims. will be.

In the present invention as described above, it is possible to maintain a short distance of transmission and reception by shortening the feedback gain generated by relaying a signal of a certain communication band, so that it is possible to construct a small repeater, and even a relay device in a single hardware structure. The configuration of can be made.

Therefore, even in a small installation area such as an urban area, it is possible to provide a shaded area service by simply attaching to the windows of the building or the roof of the apartment building by removing a large number of interference waves. The service area can be extended at low cost by attaching and relaying to a simple structure such as electric pole for the shaded area of, and the construction cost is greatly reduced because there is no need for external feeder connecting the existing transmission and reception aerial lines. have.

Claims (12)

In a wireless repeater using a radio frequency, A first receiving aerial unit for receiving a wireless signal; A second receiving aerial unit for receiving a radio signal like the first receiving aerial unit; The interference signal included in the signals received through the first and second receiving aerial units is removed, and the signals received through the first and second receiving aerial units are differentially combined to cancel the in-phase signals. An orthogonal subtraction signal generation unit configured to extract only an interference signal having a different phase and delay the interference signal by a predetermined wavelength, and delay the extracted interference signal by a quarter wavelength; Interference control including a filter unit for receiving and synthesizing a signal from the orthogonal subtraction signal generator, the first receiving aerial unit and the second receiving aerial unit, removing interference signals, and removing noise signals generated during the interference signal removing process; A first simulator and a second simulator configured to include a signal synthesizer; A selection control unit for turning off or closing the first simulator and the second simulator; A gain modulator for modulating the transmission gain of the signal received from the simulator selected through the selection controller, and a signal modulated by the gain modulator through the gain modulator and the gain modulator for modulating the amplitude of the radio signal transmitted from the repeater to a predetermined magnitude; A gain modulator comprising a gain detector for detecting a feedback gain of the output and an output protector for preventing the transmission gain transmitted from the repeater from increasing indefinitely; A transmission amplifier for amplifying the signal received from the gain modulator; Receives and amplifies the signal amplified by the transmission amplification unit, and the first receiving aerial portion and the second receiving aerial portion is arranged at a distance that is inverted phase and the wavelength of the transmission aerial line portion, in order to obtain an accurate orthogonal subtraction signal And a transmission aerial unit connected to the first receiving aerial unit and the second receiving aerial unit via a wire. delete delete delete delete delete delete delete Receiving a signal transmitted from a donor base station, a reflection interference signal and a near interference signal through a first receiving aerial unit and a second receiving aerial unit; In step ⒜, an orthogonal signal is generated by comparing the signal received through the first receiving aerial unit with the signal received through the second receiving aerial unit, and receiving the signal received through the first receiving aerial unit and the second receiving aerial unit. An interference signal having a phase that is not canceled in steps (b-2) and (b-2) that cancels the in-phase signal through the subtraction step (b-1) and the subtraction step (b-1). A step (b-3) comprising the step of extracting (b-3) and delaying the signal extracted in the step (b-3) by 1/4 wavelength; Detecting a feedback gain of the signal received through the first receiving aerial unit and the feedback signal received through the second receiving aerial unit in the step? And receiving the orthogonal signal in step 합성, synthesizing the interference control signal at an undetermined ratio, and filtering the noise signal through a filter unit to remove the generated noise signal, and synthesizing the signal at the undetermined ratio. Comparing the correlation measured in the step (d-2) and the step (d-2) to measure the correlation of the signal synthesized at the undetermined ratio in step (d-1) and (d-1) (D-4) and a constant synthesis ratio selected in the step (d-4) to select the synthesis ratio that is the minimum correlation through the correlation comparison step (d-3) and (d-3) Step (iii) comprising the step of continuously maintaining (d-5); A step of modulating the transmission gain by receiving the signal output through the interference control signal synthesizing step in step (v) and transmitting the amplitude to a predetermined magnitude; Transmitting and amplifying the original signal in order to transmit the original signal from which the interference signal has been removed in the above step; Radiating the signal amplified by the transmitting step through the transmitting aerial unit; Non-oscillating wireless relay method consisting of. delete delete delete