JP2001007750A - Radio relay system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To highly accurately remove a creeping interference signal, and to stabilize operation, and to make it difficult to generate oscillation phenomenon. SOLUTION: This radio relay system is provided with a detector 3 for detecting a signal received by a reception antenna 1 and for outputting a digital reception signal, an arithmetic unit 4 for subtracting a correction signal outputted from a creeping interference signal correcting circuit 14 from the digital reception signal, and for outputting a digital transmission signal from which the creeping interference signal is removed, a modulator 5 for generating a relay output signal based on the digital transmission signal, and a transmission antenna 7 for transmitting the relay output signal. In this case, the creeping interference signal correcting circuit 14 calculates complex correlation between the digital reception signal and the digital transmission signal, and detects the transmission path information of the creeping interference signal, and corrects the digital transmission signal, based on the transmission path information for generating and outputting the correction signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio relay apparatus for relaying a signal transmitted from a base station, such as a TV broadcast signal and a communication signal, and more particularly to a radio relay apparatus input to the relay apparatus. In the case where the frequency of the base station transmission signal and the frequency of the relay output signal output from the relay device are the same and the relay output signal goes around the receiving antenna of the relay device itself, the influence of the wraparound interference signal The present invention relates to a wireless relay device capable of removing a signal.

[0002]

2. Description of the Related Art Generally, when a TV broadcast signal, a communication signal, or the like is transmitted using a terrestrial wave, a base station transmission signal transmitted from a base station is transmitted through a plurality of wireless relay devices provided in the middle. Relayed and transmitted via At this time, in the wireless relay device, after the signal transmitted from the base station or the preceding wireless relay device is received by the receiving antenna and amplified,
It is transmitted to the next wireless relay device again by the transmission antenna,
When the frequency of the relay output signal output from the relay device is the same as the frequency of the base station transmission signal input to the relay device, and there is radio coupling between the transmission antenna and the reception antenna of the wireless relay device There is a possibility that the relay output signal transmitted from the transmitting antenna goes around the receiving antenna, is amplified by the amplifying function of the wireless relay device, and causes oscillation. In addition, when performing multi-stage relay, there is a problem that the wraparound interference signal components are accumulated, and signal deterioration occurs.

Conventionally, in this type of wireless relay device, the transmitting antenna and the receiving antenna are separated as shown in FIG. 7 (a), or they are mounted on the same support as shown in FIG. 7 (b). However, by increasing the distance between the transmitting antenna and the receiving antenna, the radio coupling between the transmitting antenna and the receiving antenna has been weakened. However, there is a problem that the physical size of the antenna of the wireless relay device becomes large and the installation place is limited. In particular, in recent years, in an urban area, it is difficult to secure the installation place of these wireless relay devices. Under such circumstances,
It has become more difficult to ensure a sufficient distance between the transmitting antenna and the receiving antenna.

On the other hand, for example, Japanese Patent Application Laid-Open No. 9-284
Japanese Patent Laid-Open No. 195 discloses an example in which the influence of a radio wave (hereinafter, referred to as a wraparound interference signal) circulating from a transmitting antenna to a receiving antenna is removed in a circuit. FIG. 8 is a diagram showing a block configuration of a wireless relay booster disclosed in Japanese Patent Application Laid-Open No. 9-284195.
Is a directional receiving antenna for receiving a signal transmitted from a base station or the like, 102 is an amplifier for amplifying the received signal received by the directional receiving antenna 101, and 117 is a wraparound interference signal for the received signal. A coupler 103 for correcting the influence; a quadrature detector 103 for extracting quadrature I and Q signals (hereinafter, referred to as received quadrature signals) from the received signal;
Reference numeral 8 denotes a demodulator that demodulates the detected quadrature I and Q signals and generates a digital demodulated signal. 119 denotes a quadrature I and Q signal based on the demodulated signal from the demodulator 118 (hereinafter referred to as a reproduced quadrature signal). The waveform generator 105 generates the waveform generator 11
9, a quadrature modulator that quadrature modulates the carrier with the reproduced quadrature signal generated in 9 to generate a relay output signal; 106, an amplifier that amplifies the relay output signal from the quadrature modulator 105;
A directional transmission antenna 07 transmits the signal amplified by the amplifier 106 to the next-stage wireless relay device.

Further, in this conventional device, in order to remove the influence of the sneak interference signal from the directional transmission antenna 107 included in the signal received by the directional reception antenna 101, a complex correlation is provided to the coupler 117. Unit 108, controller 1
09, a feedback circuit 120 including an attenuator 112 and a phase shifter 113 is connected.

Next, the operation of the conventional wireless relay device will be described. First, a signal received by the directional receiving antenna 101 is amplified by an amplifier 102, and then, by a correction signal generated by a feedback circuit 120,
The effect of the looping interference signal is corrected by the coupler 117, the signal almost equal to the base station transmission signal from the base station is detected by the quadrature detector 103, and the received quadrature signal is demodulated by the demodulator 11.
8 is input. In the demodulator 118, the quadrature detector 103
A digital demodulated signal is generated and output from the received quadrature signal detected in step (1), and a waveform generator 119 is generated based on the demodulated signal.
, A quadrature modulator 105 quadrature-modulates the carrier with the reproduced quadrature signal to generate a relay output signal for transmission. After the relay output signal is amplified by the amplifier 106, The signal is transmitted from the transmission antenna 107 to the next wireless relay device.

On the other hand, as described above, the signal received by the directional receiving antenna 101 includes a wraparound interference signal from the directional transmitting antenna 107 in addition to the base station transmission signal from the base station. During this time, the feedback circuit 120 removes the sneak interference signal by the following operation. That is, first, the quadrature detector 1
The complex correlator 108 detects a complex correlation between the received quadrature signal detected at 03 and the reproduced quadrature signal generated by the waveform generator 119 from the received quadrature signal. Here, the quadrature detector 1
The received quadrature signal detected at 03 includes, in addition to the transmission signal from the base station, a residual component of the wraparound interference signal from the directional transmission antenna 107 that cannot be completely removed by the coupler 117. Since the original signal of the wraparound interference signal is a reproduced quadrature signal generated by the waveform generator 119, the complex correlation detected by the complex correlator 108 is based on the attenuation characteristic information of the wraparound interference signal with respect to the original signal. Phase rotation information.

In this way, the controller 109 calculates the amount of attenuation and the amount of phase rotation of the sneak interference signal from the complex correlation detected by the complex correlator 108, and based on the amount of attenuation and the amount of phase rotation, the attenuator 112 And the phase shifter 113 is the amplifier 10
6, a correction signal corresponding to the sneak interference signal is generated, and the correction signal is fed back to the signal received by the directional receiving antenna 101 in the coupler 117, whereby An interference signal is removed.

[0009]

However, in the conventional wireless relay booster shown in FIG. 8, the feedback circuit 120 comprises the complex correlator 108 → the controller 109 → the attenuator 112, the phase shifter 113 → the coupler 117. A closed loop feedback control system such as → quadrature detector 103 → complex correlator 108 is configured to reduce the deviation by using residual components of the wraparound interference signal in the received quadrature signal detected by the quadrature detector 103 as deviation information. The correction signal input to the coupler 117 is changed to remove the sneak interference signal, so that the initial values of the attenuation and the phase rotation used in the attenuator 112 and the phase shifter 113 are set. Depending on the delay time of the feedback circuit 120, the feedback loop becomes unstable, and the relay output signal is not stabilized. Raniwa, the entire circuit system repeater oscillation by interference signals sneak become a positive feedback condition there is a problem that occurs.

Further, in the feedback circuit 120, since the correction regarding the signal delay time of each element constituting the circuit is not considered, for example, the attenuator 112 → the phase shifter 1
13 → the signal delay time of the circuit composed of the coupler 117 and the signal delay time of the directional transmission antenna 107 → the directional receiving antenna 101 → the amplifier 102 → the signal delay time of the transmission path of the loop interference signal composed of the coupler 117, It is difficult to accurately correct the wraparound interference signal in the combiner 117. Further, when the attenuation is changed by the attenuator 112, the delay time and the phase rotation amount are changed by the attenuator 112. For this reason, the phase and delay time of the correction signal cannot be corrected accurately, and there is a problem that the wraparound interference signal cannot be sufficiently removed.

Further, since the correction for the sneak interference signal is performed at the analog signal stage, the attenuator 112 and the phase shifter 1 are used.
For example, an analog element or a circuit having high accuracy and high stability in characteristics with respect to a temperature change or the like is required, and the cost of the relay apparatus is increased.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems of the conventional apparatus, and a first object of the present invention is to provide a circuit for correcting a sneak interference signal in a circuit. An object of the present invention is to obtain a wireless relay device that can reduce the location conditions of an antenna and a receiving antenna.

It is a second object of the present invention to provide a radio relay apparatus in which an oscillation phenomenon is less likely to occur and a correction for a wraparound interference signal is stably performed.

Further, a third object of the present invention is to provide a radio relay apparatus which has high correction accuracy for a looping interference signal and has little signal deterioration due to accumulation of the looping interference signal component even when performing multistage relaying. And

A fourth object of the present invention is to provide a radio repeater which does not require expensive high-precision analog elements and can reduce the cost.

Further, a fifth object of the present invention is to correct even a plurality of delayed waves due to multipath, corresponding to a sneak interference signal corresponding to each delayed wave, and to cause an oscillation phenomenon. An object is to obtain a difficult wireless relay device.

A sixth object of the present invention is to provide a radio repeater which is less likely to cause an oscillation phenomenon due to a wraparound interference signal even when the repeater is activated.

A seventh object of the present invention is to edit and transmit a received signal such as replacing a part of the received signal with a different signal during a relay operation in the relay device. An object is to obtain a possible wireless relay device.

[0019]

In order to achieve the above object, a wireless relay apparatus according to the present invention has a receiving antenna for receiving a signal, and a correction signal for a received signal received by the receiving antenna. And an arithmetic unit that outputs a transmission signal, a transmission antenna that transmits the transmission signal output from the arithmetic unit, and a reception signal that is received by the reception antenna and a transmission signal that is transmitted from the transmission antenna. By detecting the correlation information, the transmission path information of the sneaking interference signal that wraps around from the transmission antenna to the reception antenna is detected, and the transmission signal transmitted from the transmission antenna is corrected based on the transmission path information. Thus, a sneaking interference signal correction circuit for generating and outputting the correction signal corresponding to the sneaking interference signal is provided.

Further, in the radio relay apparatus according to the present invention, the wraparound interference signal correction circuit includes a complex correlator for detecting a correlation between the digitized reception signal and the transmission signal, and a complex correlator. A transmission line information controller for detecting a delay time, an attenuation amount, and a phase rotation amount of the wraparound interference signal from the detected correlation information, and calculating and outputting a correction amount for the delay time, the attenuation amount, and the phase rotation amount; The transmission signal is delayed, attenuated, and phase-shifted based on the correction amount of the delay time, the attenuation amount, and the phase rotation amount output from the path information controller to generate the digitized correction signal for the wraparound interference signal. And a correction signal generation circuit for evaluating the correction signal by digital processing.

Further, in the radio relay apparatus according to the present invention, the wraparound interference signal correction circuit may include a complex correlator for detecting a correlation between the digitized reception signal and the transmission signal, and A transmission line information controller that detects a delay time, an attenuation amount, and a phase rotation amount of the wraparound interference signal from the correlation information detected by the detector, and calculates and outputs a correction amount for the delay time, the attenuation amount, and the phase rotation amount; The correction signal digitized with respect to the sneak interference signal by delaying, attenuating, and phase-shifting the transmission signal based on the correction amount of the delay time, the amount of attenuation, and the amount of phase rotation output from the transmission line information controller. And a plurality of canceller circuits for evaluating the correction signal by digital processing, and a plurality of canceller circuits. Each of the detection period of the delay time of the complex correlator is obtained by setting the different ranges, respectively.

Further, the wireless relay device according to the present invention is
A receiving antenna for receiving a signal, a receiving amplifier for amplifying a received signal received by the receiving antenna, detecting a received signal output from the receiving amplifier, and outputting a digitized digital received signal A detector, the arithmetic unit that calculates a digital correction signal for the digital reception signal output from the detector, and outputs a digital transmission signal, and relays based on the digital transmission signal output from the arithmetic unit. A modulator for generating an output signal, a transmission amplifier for amplifying a relay output signal output from the modulator, the transmission antenna for transmitting a relay output signal amplified by the transmission amplifier, and the digital reception signal. And the wraparound interference signal correction circuit that generates the digital correction signal based on the digital transmission signal and outputs the correction signal to the arithmetic unit. It includes those were.

Further, the radio relay apparatus according to the present invention includes the receiving antenna for receiving a signal, a receiving amplifier for amplifying a received signal received by the receiving antenna,
A detector that detects a reception signal output from the reception amplifier and outputs an analog detection signal, and calculates an analog correction signal for the detection signal output from the detector and converts the analog modulation signal The arithmetic unit for outputting, a modulator for generating a relay output signal based on the modulation signal output from the arithmetic unit, a transmission amplifier for amplifying the relay output signal output from the modulator, The transmitting antenna for transmitting a relay output signal amplified by an amplifier, an A / D converter for converting an analog detection signal output from the detector into a digitized digital reception signal, and an output from the arithmetic unit A / D for converting a converted analog modulated signal into a digitized digital transmission signal
A converter, a digital correction signal is generated based on the digital reception signal and the digital transmission signal, the wraparound interference signal correction circuit that outputs the digital correction signal, and a digital correction signal output from the wraparound interference signal correction circuit. A D / A converter that converts the signal into the analog correction signal and outputs the signal to the arithmetic unit.

[0024] Also, the radio relay apparatus according to the present invention includes: the receiving antenna for receiving a signal; a receiving amplifier for amplifying a received signal received by the receiving antenna;
Calculating a correction signal modulated on the received signal output from the receiving amplifier, the arithmetic unit to output a relay output signal, and a transmission amplifier to amplify the relay output signal output from the arithmetic unit A transmitting antenna that transmits a relay output signal amplified by the transmitting amplifier; a detector that detects a signal output from the receiving amplifier and outputs a digitized digital received signal; and the arithmetic unit A quadrature detector for a transmission signal that detects the relay output signal output from the multiplexing unit and outputs a digitized digital transmission signal, and generates and outputs a digital correction signal based on the digital reception signal and the digital transmission signal. The wraparound interference signal correction circuit generates the correction signal modulated based on a digital correction signal output from the wraparound interference signal correction circuit. And, in which a correction signal modulator for outputting to the calculator.

Further, the radio relay device according to the present invention
The transmission line information controller detects a delay time, an attenuation amount, and a phase rotation amount of the wraparound interference signal from the correlation information detected by the complex correlator, averages the detected values for a predetermined time, and calculates the average value. Is output to the correction signal generation circuit as the correction amount.

[0026] Further, the radio relay apparatus according to the present invention, when starting up the radio relay apparatus, controls the amplification gain of the transmission amplifier to a predetermined level or less until the loop-back interference signal correction circuit functions. A circuit is provided.

[0027] Further, the radio relay apparatus according to the present invention, between the arithmetic unit and the modulator, demodulates a transmission signal output from the arithmetic unit to generate a demodulated signal; And an information converter for generating a new transmission signal based on the demodulated signal output from the external device and the external input signal input from the external information input device, and outputting the generated signal to the modulator.

Further, the radio relay device according to the present invention
An information storage means for storing information in the external information input device is provided, and data demodulated by the demodulator is input and stored in the information storage means via the information converter and the external information input device, The data stored in the information storage means is output to the information converter via the external information input device, so that data can be mutually input and output between the information converter and the information storage means. Things.

[0029]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a block diagram illustrating a configuration of a wireless relay device according to Embodiment 1 of the present invention. In FIG. 1, 1 is a directional receiving antenna for receiving a signal transmitted from a base station or the like, 2 is a receiving amplifier for amplifying a received signal received by the directional receiving antenna 1, and 3 is an A / D converter 3a. And a quadrature detector 4 for extracting quadrature I and Q signals from the received signal and generating a digitized detection signal (hereinafter, referred to as a digital reception signal). A subtractor that corrects the influence of the interference signal and outputs quadrature I and Q signals as a digitized modulated signal for transmission (hereinafter, referred to as a digital transmission signal), has a D / A converter 5a, The digital transmission signal output from the device 4 is D /
A quadrature modulator that quadrature modulates the carrier after A-conversion and generates a relay output signal, 6 is a transmission amplifier that amplifies the relay output signal output from quadrature modulator 5, and 7 is a transmission amplifier 6
This is a directional transmission antenna that transmits the relay output signal amplified by the above to the next-stage wireless relay device.

Further, in the first embodiment, in order to remove the influence of the sneak interference signal from the directional transmission antenna 7 included in the signal received by the directional reception antenna 1, the subtractor 4 includes: Complex correlator 8, transmission line information controller 9, buffer memory 10, delay tap 11, attenuator 1
2. A wraparound interference signal correction circuit 14 comprising a phase shifter 13
Is connected.

Next, the operation of the first embodiment will be described. First, when a signal transmitted at a predetermined carrier frequency from a base station or the like is received by the directional receiving antenna 1,
After the received signal is amplified by the receiving amplifier 2,
A quadrature detector 3 performs quadrature detection, and an A / D converter 3a
, And is input to the subtractor 4. The subtractor 4 removes the influence of the wraparound interference signal from the digital reception signal using the correction signal generated by the wraparound interference signal correction circuit 14 and inputs the digital reception signal to the quadrature modulator 5 as a digital transmission signal. Next, in the quadrature modulator 5, the digital transmission signal is converted into an analog signal by the D / A converter 5a, and then the carrier is quadrature-modulated. An output signal is generated, and this relay output signal is power-amplified by the transmission amplifier 6, and then transmitted from the directional transmission antenna 7 to the next-stage wireless relay device.

On the other hand, since the signal received by the directional receiving antenna 1 includes the sneak interference signal from the directional transmission antenna 7 in addition to the base station transmission signal from the base station, The interference signal correction circuit 14 removes the wraparound interference signal by the following operation. That is, first, the digital transmission signal corrected by the subtractor 4 is sent to the quadrature modulator 5 for transmission to the next-stage relay device, and at the same time, is also output to the buffer memory 10 and is sent to the buffer memory 10. Stored and accumulated for a certain period of time. The complex correlator 8 detects a complex correlation between the stored digital transmission signal and the digital reception signal detected by the quadrature detector 3. Here, the digital reception signal detected by the quadrature detector 3 includes a wraparound interference signal from the directional transmission antenna 7 in addition to the base station transmission signal from the base station. Is the digital transmission signal generated by the subtractor 4, the complex correlation detected by the complex correlator 8 is the transmission path information of the wraparound interference signal, that is, the wraparound interference with the original signal. This includes signal attenuation characteristic information, phase rotation information, and delay time information until the signal output from the subtractor 4 is detected by the quadrature detector 3.

Thus, from the complex correlation detected by the complex correlator 8, the transmission line information controller 9 calculates the attenuation, phase rotation and delay time of the sneak interference signal, and calculates the attenuation, phase rotation and delay. Based on the delay time, the attenuator 12,
The correction signal generation circuit 15 including the phase shifter 13 and the delay tap 11 corrects (attenuates, rotates, delays) the digital transmission signal stored in the buffer memory 10 so that the correction signal corresponding to the wraparound interference signal is obtained. Generated
The subtracter 4 corrects the digital reception signal detected by the quadrature detector 3 using the correction signal, thereby removing the wraparound interference signal.

As is apparent from the above description, in the first embodiment, the sneak interference signal correction circuit 14
Detects a change in the digital transmission signal, which is the original signal of the wraparound interference signal, and predicts and evaluates the effects of this change in advance based on the data of the transmission path information obtained from the correlation information up to that point. , And the subtracter 4 directly corrects the received digital signal, thereby forming a so-called feedforward control system.

In the following, details of the operation of the first embodiment will be described using equations. Now, assuming that the digital transmission signal (S1) output from the subtractor 4 is r (t),
The signal (S2) incident on the directional receiving antenna 1 is phase-rotated by the base station transmission signal (S3) from the base station and the relay output signal transmitted from the directional transmission antenna 7 undergoing attenuation of the transmission path. , The delayed interference signal (S
4) and can be expressed by the following equation. A * exp (jθ) * r (t−τ1) + r (t + τ2) (1) where τ1 is a signal delay time from after the subtractor 4 to the directional transmission antenna 7, and τ2 is subtracted from the directional reception antenna 1. A is a signal delay time until after the device 4, A is an attenuation by a transmission path from the directional transmitting antenna 7 to the directional receiving antenna 1,
θ is the phase rotation (delay) including the delay time due to the transmission path from the directional transmitting antenna 7 to the directional receiving antenna 1, j
Is an imaginary unit, and the first term of equation (1) corresponds to the wraparound interference signal (S4), and the second term corresponds to the transmission signal (S3) from the base station.

Thus, the signal (S) after passing through the quadrature detector 3
5) using the signal delay time τ3 from the directional receiving antenna 1 to after the quadrature detector 3, A * exp (jθ) * r (t−τ1−τ3) + r (t + τ2−τ3) (2) Become.

On the other hand, the signal output from the subtractor 4 to the buffer memory 10 is r (t), and the complex correlator 8 outputs the signal r (t) stored in the buffer memory 10.
, A signal r (t−τ) delayed by a delay time τ is generated, and while changing the delay time τ as a parameter, the complex conjugate r (t−τ) ^{* of} the signal r (t−τ) and the above (2) The product of the equation and the signal (S5) after passing through the quadrature detector 3, {A * exp (jθ) * r (t−τ1−τ3) + r (t + τ2−τ3)} * r (t−τ) ^* (3 ) Is integrated for a certain period of time to detect a complex correlation between the signal S1 and the signal S5 when the delay time parameter is τ.

Here, considering a case where the transmission signal has an extremely strong autocorrelation characteristic and is uncorrelated with other signals, the complex correlation Z is 0 except when the phases of both signals are the same. In the complex correlator 8, the above (3)
The complex correlation Z calculated from the equation becomes 0 except that Z = A * exp (jθ) * | r (t) | ² (4) at τ = τ1 + τ3. Note that the above equation (3) is given by τ =
A value other than 0 is also given to −τ2 + τ3.
The signal of the second term of the equation (3) corresponding to τ2 + τ3 corresponds to the base station transmission signal from the base station, and is a signal whose phase is advanced with respect to the original signal. The second term is also 0.

As described above, the complex correlator 8 calculates the complex correlation Z while changing the delay time parameter τ, and searches for the delay time parameter τ at which the complex correlation Z is maximized. When τ1 + τ3 is detected and this complex correlation Z is normalized by | r (t) | ² separately calculated from the data in the buffer memory 10, the transmission path information A * exp (jθ) can be obtained.

The transmission path information A * exp (jθ) detected by the complex correlator 8 is then transmitted to the transmission path information controller 9
The transmission line information controller 9 calculates the attenuation amount A and the phase rotation amount θ from the transmission line information,
1 delays the digital transmission signal output from the buffer memory 10 based on the delay time τ1 + τ3 detected in the above process, and the attenuator 12 and the phase shifter 13 determine the delay based on the amount of attenuation A and the amount of phase rotation θ. By performing attenuation and phase correction, a correction signal corresponding to the sneak interference signal is generated by the correction signal generation circuit 1.
5 is output. Then, this correction signal has a delay time τ
The signal input to the subtracter 4 at the optimal timing corresponding to 1 + τ3 and subtracted from the digital reception signal detected by the quadrature detector 3 removes the sneak interference signal from the subtractor 4 to the quadrature modulator. 5 will be output.

As is clear from the above description, the sum of the delay time τ1 + τ3 and the time conversion value (= θ / ω) of the phase rotation amount θ of the transmission line is output from the subtractor 4 The complex correlation Z includes the signal delay time information of the entire transmission path including the signal processing circuit, which corresponds to the delay time until this signal is detected again by the quadrature detector 3 as a looping interference signal. It is a thing. In addition, the delay tap 11
The delay time actually delayed by the delay time τ1 + τ3 takes into account the delay time required for signal processing in the wraparound interference signal correction circuit 14, and the like.
Needless to say, it is not τ3 itself.

As described above, according to the first embodiment, the configuration is such that the influence of the sneak interference signal from the directional transmission antenna 7 to the directional reception antenna 1 is eliminated in a circuit manner. The installation condition of the antenna 7 and the directional receiving antenna 1 is reduced, and the location condition of the wireless relay device is reduced.

Further, a subtractor 4 for correcting the loop interference signal is arranged between the quadrature detector 3 and the quadrature modulator 5, and the loop interference signal correction circuit 14 becomes an original signal of the loop interference signal. Since the correction is performed by the feedforward control based on the digital transmission signal and the transmission path information detected by the complex correlator 8, a wireless relay apparatus with high stability of the control system and in which the oscillation phenomenon hardly occurs can be obtained. There is an effect that a wireless relay device with good responsiveness to a change in road characteristics can be obtained.

Further, the transmission line information controller 9 detects the delay time of the wraparound interference signal, and based on this delay time, the delay tap 11 delays the correction signal and includes the corresponding wraparound interference signal. Digital received signal is subtracter 4
The correction signal is input to the subtracter 4 in accordance with the timing of inputting the correction signal to the subtractor 4, and the correction is performed. Therefore, even when multi-stage relaying is performed, signal deterioration due to accumulation of wraparound interference signal components is reduced, and in particular, an effect of obtaining a wireless relay device suitable for broadcast waves in which a multi-stage relay system is frequently used is obtained. is there.

Further, since the above-described correction processing is performed digitally, the accuracy of the correction processing in the delay tap 11, the attenuator 12, and the phase shifter 13 is improved, and the correction for the sneak interference signal can be performed more precisely. In addition, the effect of temperature fluctuation and the like is reduced, and an expensive high-precision analog element is not required, so that the cost can be reduced.

In the first embodiment, an example has been shown in which the digital transmission signal output from the buffer memory 10 is modified in the order of the delay tap 11, the attenuator 12, and the phase shifter 13. May be any type. For example, if the correction is made in the order of the attenuator 12 → the phase shifter 13 → the delay tap 11, the delay tap 11 becomes a buffer when input to the subtractor 4. , Subtractor 4
There is an effect that the fine adjustment of the input timing to the device becomes easy.

Further, if the delay time τ1 + τ3 is converted into the amount of phase change and the function of the delay tap 11 is integrated into the phase shifter 13, the delay tap 11 can be eliminated. Conversely, when the phase rotation amount θ is large, the phase rotation amount θ may be converted into time (= θ / ω) and delayed by the delay tap 11 to perform the phase correction.

In the first embodiment, the transmission line information controller 9 calculates the delay time, attenuation, and phase rotation of the transmission line based on the output from the complex correlator 8, and outputs The data used by the attenuator 12 and the phase shifter 13 is configured to be updated with the new data every time. For example, the delay time, the attenuation, and the phase rotation are averaged for a certain period, and the average value is updated. Alternatively, a configuration may be employed in which a cumulative average of all past data is used. In addition, as an averaging method, averaging may be performed not by individually averaging the delay time, the attenuation amount, and the phase rotation but by vectorizing all of these characteristics (for example, a complex correlation Z or the like). .

In the first embodiment, the digital transmission signal is temporarily stored in the buffer memory 10 and input to the complex correlator 8 and the delay tap 9. And each of the delay unit 8 and the delay tap 11 may be configured.
When the complex correlator 8 is configured to perform the parallel correlation calculation for various delay time parameters τ, the buffer memory 10 is not necessarily required. Further, the operation of the digital reception signal detected by the quadrature detector 3 and the correction signal for the sneak interference signal may be inverted by the correction signal and then added by an adder. Applicable. Also, the receiving antenna 1
The same is true even if the transmitting antenna is an omnidirectional antenna.

In the first embodiment, a digital quadrature detector having an A / D converter 3a as the detector 3 is used.
Also, an example has been shown in which a digital quadrature modulator having a D / A converter 5a is used as the modulator 5 and correction processing is performed by a digital signal including the wraparound interference signal correction circuit 14. , The subtractor 4 and the wraparound interference signal correction circuit 14 are analog signal processing circuits,
It is also possible to configure so that the correction processing is performed with an analog signal.

Embodiment 2 FIG. 2 shows a modified example of the first embodiment, in which the evaluation of the correction signal is performed by digital processing which is advantageous in terms of signal processing accuracy, while the processing of subtracting the wraparound interference signal from the reception signal received by the reception antenna 1 is performed. Is configured to be implemented by an analog signal. FIG.
Is a block diagram showing the configuration of the second embodiment of the present invention. In FIG. 2, reference numeral 23 denotes an orthogonal I and Q signal extracted from the received signal output from the receiving amplifier 2 and outputs an analog detection signal. The quadrature detector 23a performs A / D conversion on the detection signal to perform digital processing in the wraparound interference signal correction circuit 14, and generates a digital reception signal.
A / D converter 24a is a D / A converter for converting the digitized correction signal output from the wraparound interference signal correction circuit 14 into an analog signal, and 24 is an analog detection signal output from the quadrature detector 23 D / A converter 24
a subtractor that subtracts the analog correction signal output from the a and outputs quadrature I and Q signals which are transmission modulation signals in which the influence of the sneak interference signal has been corrected; Modulate the carrier based on the quadrature I and Q signals,
A quadrature modulator for generating a relay output signal;
4 is an A / D converter that converts analog quadrature I and Q signals output from 4 into digital signals for input to the sneak interference signal correction circuit 14.

As is apparent from FIG.
Then, the A / D converters 23a and 25a and the D / A converter 24
a is separated from the quadrature detector 23 and the quadrature modulator 25, and the correction signal is evaluated by digital processing, while the subtraction processing of the wraparound interference signal is performed by an analog signal. In the figure, the same or corresponding parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

Hereinafter, the operation of the second embodiment will be described. The reception signal received by the reception antenna 1 is amplified by the reception amplifier 2 and then detected by the quadrature detector 23 to generate quadrature I and Q signals. The quadrature I and Q signals are digitized by the A / D converter 23a and input to the wraparound signal correction circuit 14 as digital reception signals, while being input as analog signals to the subtractor 24, The analog correction signal output from the D / A converter 24a is subtracted, and the correction process is performed in analog. In this way, the signal from which the interference signal has been removed is sent to the quadrature modulator 25 to modulate the carrier,
A relay output signal is generated and the A / D converter 25
a to generate a correction signal as a digital transmission signal.
Is input to

On the other hand, the wraparound interference signal correction circuit 14 generates a digital correction signal from the digital reception signal and the digital transmission signal in exactly the same manner as in the first embodiment. The converted signal is converted into an analog signal by the D / A converter 24a and output to the subtractor 24, whereby the sneak interference signal is corrected by the subtractor 24.

The detailed operation of the wraparound interference signal correction circuit 14 is exactly the same as that of the first embodiment.
Although not described, in the second embodiment, an A / D converter 23 is provided between the sneak interference signal correction circuit 14 and the subtractor 24.
a, 25a and the D / A converter 24a are arranged, so that the delay time of the delay tap 11 is determined in consideration of the signal delay time of the A / D converters 23a and 25a and the D / A converter 24a. The correction signal is set in accordance with the input of the corresponding received signal to the subtractor 24, and the configuration is such that highly accurate correction can be performed.

As described above, according to the second embodiment, the same effects as those of the first embodiment can be obtained, and the prediction of the correction signal is performed by digital processing in the sneak signal correction circuit 14. , The subtraction between the received signal and the correction signal is performed by the quadrature detector 23 and the quadrature modulator 25.
Since the subtractor 24 provided between them is configured to perform analog processing, the A / D conversion is performed while maintaining the accuracy of the correction signal.
The radio relay capable of reducing the number of quantization bits of the converters 23a and 25a and accurately correcting the wraparound interference signal even when the dynamic range between the wraparound interference signal and the original base station transmission signal is large. There is an effect that the device can be obtained.

That is, in the first embodiment, in order for the subtractor 4 to accurately subtract the wraparound interference signal component,
A / D up to a level that can detect changes in the wraparound interference signal
If the number of quantization steps of the converter 3a needs to be sufficiently large, and if the signal level of the wraparound interference signal is extremely small or large with respect to the original transmission signal, it is necessary to increase the number of quantization bits. There is. On the other hand, in the second embodiment, since the subtraction process, which is the final stage of the correction process, is performed on the analog signal, the number of bits of the digital signal input to the wraparound interference signal correction circuit 14 is significantly increased. A / D converter 23
The circuit of the sneak interference signal correction circuit 14 including a and 25a and the D / A converter 24a can be simplified.

Embodiment 3 FIG. FIG. 3 is a block diagram of a wireless relay device according to a third embodiment of the present invention. In the first and second embodiments, the subtraction processing of the wraparound interference signal with respect to the reception signal received by the directional reception antenna 1 is performed on the signal in the baseband region after detection. In the third embodiment, Although the calculation of the correction signal is performed using the reception signal (digital reception signal) and the transmission signal (digital transmission signal) in the baseband region, the subtraction processing of the wraparound interference signal is performed on the reception signal in the radio frequency region having a carrier frequency. There is a feature in the point of doing. FIG.
, A quadrature detector 3 having an A / D converter 3a for extracting a digitized digital reception signal from the reception signal output from the reception amplifier 2; and 34, a quadrature detector for detecting a signal output from the reception amplifier A subtracter for correcting the influence of the sneak interference signal and generating a relay output signal for transmission; 31
Includes an A / D converter 31a, detects a relay output signal output from the subtractor 34, and outputs a digitized digital transmission signal corresponding to the relay output signal. A / A converter 32a, which performs D / A conversion of a correction signal from the wraparound interference signal correction circuit 14, and then quadrature modulates a carrier to generate a signal having a carrier frequency corresponding to the correction signal. It is.
In the figure, the same or corresponding parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

The operation of the third embodiment will be described below. After the signal received by the receiving antenna 1 is amplified by the receiving amplifier 2, one of the signals is input to the quadrature detector 3 having the A / D converter 3 a, and the digital received signal that has been detected and A / D converted is converted into a signal. Sneak interference signal correction circuit 1
4 and the other is directly input to the subtractor 34, where it is calculated with the correction signal modulated by the modulator 32 to remove the sneak interference signal. Then, the signal from which the component of the sneak interference signal has been removed is input from the subtracter 34 to the transmission amplifier 6 as a relay output signal, transmitted from the transmission antenna 7 and transmitted to the A / D converter 31.
The digital transmission signal which is input to the transmission signal quadrature detector 31 provided with a and subjected to detection and A / D conversion and digitized is input to the wraparound interference signal correction circuit 14.

On the other hand, in the wraparound interference signal correction circuit 14, in the same manner as in the first and second embodiments, a correction signal corresponding to the wraparound interference signal is obtained from the above digital reception signal and digital transmission signal. Is generated, the correction signal is converted by the D / A converter 32 a, and the carrier is modulated by the correction signal modulator 32 to generate a carrier signal corresponding to the correction signal, which is input to the subtractor 34. Thus, the subtractor 34 calculates two analog signals having the carrier frequencies output from the receiving amplifier 2 and the correction signal modulator 32, and removes the sneak interference signal. Since the detailed operation of the wraparound interference signal correction circuit 14 is exactly the same as in the first embodiment,
Although the description is omitted, in the third embodiment, the correction signal modulator 3 is provided between the sneak interference signal correction circuit 14 and the subtractor 34.
2 and the like, the delay time of the delay tap 11 is the same as in the second embodiment,
2, the quadrature detector 3, and the signal delay time of the transmission signal quadrature detector 31 are taken into consideration.

As described above, according to the third embodiment, the prediction of the correction signal is performed by digital processing in the sneak signal correction circuit 14, and the subtraction processing of the received signal and the correction signal is performed by the reception signal correction circuit 14. Since the subtractor 34 provided between the amplifier 2 and the transmission amplifier 6 is configured to perform analog processing, the number of quantization bits of the A / D converters 3a and 31a can be reduced while maintaining the accuracy of the correction signal. Thus, even when the dynamic range between the wraparound interference signal and the original base station transmission signal is large, there is an effect that a wireless relay apparatus capable of accurately correcting the wraparound interference signal can be obtained.

In the third embodiment, the correction for the sneak interference signal is performed on the received signal at the radio frequency stage. However, a subtraction process may be performed at the intermediate frequency stage to obtain the same effect. Can be.

Embodiment 4 FIG. 4 is a block diagram of a wireless relay apparatus corresponding to a multipath environment in which a plurality of delayed waves exist in a loop interference signal as a fourth embodiment of the present invention. FIG. 4 is a configuration example in the case where there are three delayed waves, and in the figure, 16, 26 and 36 are:
Complex correlator 8, transmission line information controller 9, delay tap 11, attenuator 12 similar to those shown in the first embodiment, respectively.
A first canceller circuit having a phase shifter 13 and a second
And a third canceller circuit. In the drawing, the same or corresponding parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

Hereinafter, the first to third canceller circuits 1
Embodiment 4 focusing on the configurations and operations of 6, 26 and 36
Will be described. As described above, each of the first canceller circuit, the second canceller circuit, and the third canceller circuit has exactly the same configuration as in the first embodiment, and basically performs the same operation. On the other hand, the complex correlator 8
The integration period and the detection period of the delay time are set to a unique value corresponding to the assumed delay time of each delay wave for each canceller circuit corresponding to each delay wave generated by the multipath, and A plurality of canceller circuits 16 so that the signal output from the buffer memory 10 can be separately corrected according to the delay time, attenuation characteristic, and phase rotation of each delayed wave.
26, 36 are arranged in parallel and in multiple stages between the quadrature detector 3, the subtractor 4, and the buffer memory 10 by the number of delay waves. In FIG. 4, a plurality of canceller circuits 16, 2
Buffer memory 10 and subtractor 4
In the example shown, only one canceller circuit is provided.
A configuration may be adopted in which a plurality of buffer memories 10 and a plurality of subtracters 4 are provided corresponding to 6, 26 and 36.

Thus, according to the fourth embodiment, separate canceller circuits 16, 26, and 36 are provided for a plurality of delay waves generated by multipath, respectively.
Each of the canceller circuits 16, 26, and 36 detects a delay time, an attenuation characteristic, and a phase rotation characteristic with respect to the corresponding delay wave, and generates a correction signal corresponding to each delay wave. , It is possible to effectively remove the influence of the sneak interference signal even in a multipath environment in which a plurality of delayed waves are generated by the multipath, and the same effects as those of the first embodiment can be obtained. Is obtained.

Although the fourth embodiment has described an example in which a plurality of canceller circuits are provided based on the first embodiment, a plurality of canceller circuits are provided in the configuration of the second or third embodiment. May be provided, and exactly the same effect can be obtained.

Embodiment 5 FIG. 5 is a block diagram showing a fifth embodiment of the present invention. In FIG. 5, 41
Is an amplifier control circuit that suppresses and controls the amplification gain of the transmission amplifier 6 for a certain period of time so that oscillation due to the sneak interference signal does not occur when the wireless relay device is activated. In the drawing, the same or corresponding parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

Hereinafter, the operation of the amplifier control circuit 41 will be described. For example, when the broadcast radio relay device or the like is started while a base station transmission signal is being transmitted from the base station, data is sufficiently accumulated in the buffer memory 10 and the wraparound interference signal correction circuit 14 becomes stable. Before functioning as a relay, the relay output signal amplified by the transmission amplifier 6 is transmitted from the directional transmission antenna 7, and the possibility that the relay apparatus oscillates due to the wraparound interference signal increases. Therefore, in the fifth embodiment, the transmission amplifier 6
Is controlled for a certain period of time after the start of the wireless relay device, to suppress the amplification gain of the transmission amplifier 6 to a level at which oscillation does not occur. Here, the amplification gain suppression time of the amplifier control circuit 41 is determined by the amount of data stored in the buffer memory 10, the complex correlation detected by the complex correlator 8, and the attenuation and phase output from the transmission path information controller 9. It may be longer than the time until the data of the rotation amount and the delay time is substantially stabilized, and the approximate time until the wraparound interference signal correction circuit 14 is stabilized (in a typical design condition, several μm).
(Approximately seconds to several tens of microseconds) is evaluated at the time of design, and a time longer than this time is set as an amplification gain suppression time of the amplifier control circuit 41.

As described above, according to the fifth embodiment, the transmission amplifier 6 is provided to the transmission amplifier 6 for a fixed time until the operation of the loop interference signal correction circuit 14 becomes stable when the radio relay apparatus is started. 6, the amplifier control circuit 41 for suppressing the amplification gain is provided, so that it is possible to prevent the amplification gain of the relay output signal from becoming excessively large at the time of activation of the wireless relay apparatus, thereby preventing the relay apparatus from oscillating, and the oscillation is hardly generated even at the time of activation. There is an effect that a wireless relay device can be obtained. The amplifier control circuit 41
Automatically controls the amplification gain of the transmission amplifier 6,
There is an effect that the start-up operation becomes easy and the start-up operation can be surely performed. In particular, in a radio relay device for broadcast waves, after the relay device temporarily stops due to a power outage or the like, the power outage is recovered, and it is necessary to perform a restart while broadcasting is being performed. According to 5, even in such a case, the wireless relay apparatus can be started up stably and automatically, which is a great advantage.

As a method of controlling the amplification gain of the transmission amplifier 6 of the amplifier control circuit 41, in addition to the setting of the above-mentioned constant value, the transmission amplifier 6 of the transmission amplifier 6 is set within a range where oscillation due to the sneak interference signal does not occur. The control may be performed so that the amplification gain is gradually increased.
Is connected to the transmission line information control circuit 9 to detect the stable state of the wraparound interference signal correction circuit 14 based on the output data of the amount of attenuation, phase rotation, and delay time from the transmission line information control circuit 9 and transmit the signal. The amplification gain of the credit amplifier 6 may be controlled.

It is needless to say that the same effect can be obtained even if the amplifier control circuit 41 is provided in the second or third embodiment.

Embodiment 6 FIG. FIG. 6 shows a block diagram of a wireless relay apparatus according to Embodiment 6 of the present invention.
In the sixth embodiment, for example, it is possible to replace a broadcast program in a broadcast wave relay device. In the figure, reference numeral 51 denotes a demodulator for demodulating an output signal of the subtractor 4;
52 is an external information input device for inputting an external program or the like,
53 is an information converter that edits the signal demodulated by the demodulator 51 and the signal input from the external information input device 52 to generate a new digital transmission signal, and 54 is an output of the digital transmission signal output from the subtractor 4 This is a signal switch for switching the end between the quadrature modulator 5 and the demodulator 51. In the drawing, the same or corresponding parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

The operation of the sixth embodiment will be described below. In FIG. 6, when the program is not edited,
The signal switch 54 connects a switch to the quadrature modulator 5 so that the output from the subtractor 4 is directly input to the quadrature modulator 5.
The relay operation is performed in exactly the same manner as in the first embodiment. On the other hand, for example, when a local version of a program is inserted between broadcast programs and the signal output from the subtractor 4 is edited by an external input signal, the signal switch 54 switches the switch, and Is input to the demodulator 51. Thus, the signal input to the demodulator 51 is temporarily
After being demodulated in step 1, the signal is output to the information converter 53 as digital demodulated data, and the information converter 53 edits the signal input from the external information input device 52 and converts the digital transmission signal corresponding to the changed program into an orthogonal signal. The signal is input to the modulator 5 and transmitted from the wireless relay device by the same operation as that of the first embodiment.

As a data source of the information output from the external information input device 52, the data of the replacement program is directly output in real time to the external information input device 5.
2 and outputs it to the information converter 53. In addition, an information storage means (not shown) such as a VTR device or a DVD device is added to the external information input device 52, and data recorded in advance in the information storage means is stored. Data exchange between the information storage means and the information converter 53 via the external information input device 52, and the data received by the wireless relay device is temporarily stored in the information storage means. The data may be recorded, and at a different time, the recorded data may be retrieved from the information storage unit and transmitted from the relay device.

In FIG. 6, a signal switch 54 is provided on the output side of the subtractor 4 so that the output of the subtractor 4 is directly input to the orthogonal transformer 5, and the demodulator 51 and the information converter 53 In the case where the signal path is input to the orthogonal transformer 5 through the above, an example is shown in which the signal path can be switched between two.
One or more signal paths may be switched. Conversely, the signal switch 54 is not provided, and the demodulator 51 is always switched.
And input to the orthogonal transformer 5 via the information converter 53, and input the data from the external information input device 52 to the information converter 53 only when editing such as a program change is necessary. The conversion may be performed.

As described above, according to the sixth embodiment, it is possible to obtain a radio relay apparatus capable of editing a signal input from the external information input device 52 with respect to a received signal, such as replacement of a program. effective. Also, by switching the signal switch 54, the signal path changes. For example, even if the delay time of the circuit changes due to the processing in the information converter 53, etc., in the present invention, the wraparound interference signal correction circuit 14 automatically detects the delay time and corrects the delay time with good response by the feedforward control, so that the sneak interference signal can be accurately removed and the wireless relay device with little influence of the sneak interference signal is provided. There is an effect that can be obtained.

In the above-described first to sixth embodiments, as an example, a description has been given of a wireless relay device for broadcast waves, but various wireless relay devices for wirelessly transmitting various information such as communication signals are described. It is clear from the above description that the present invention is also applicable and is not limited to broadcast waves.

[0078]

Since the present invention is configured as described above, it has the following effects.

A receiving antenna for receiving a signal, an arithmetic unit for calculating a correction signal for the received signal received by the receiving antenna and outputting a transmission signal, and transmitting the transmission signal output from the arithmetic unit A transmission antenna, and a transmission path of a sneaking interference signal sneaking into the reception antenna from the transmission antenna by detecting correlation information between a reception signal received by the reception antenna and a transmission signal transmitted from the transmission antenna. A wraparound interference signal correction circuit for detecting information and generating and outputting the correction signal corresponding to the wraparound interference signal by correcting a transmission signal transmitted from the transmission antenna based on the transmission path information. As a result, a wireless repeater with high stability of the correction circuit system against the sneak interference signal and less occurrence of oscillation phenomenon was obtained. There is that effect.

The wraparound interference signal correction circuit is
A complex correlator that performs correlation detection between the digitized reception signal and the transmission signal, and detects a delay time, an attenuation amount, and a phase rotation amount of the wraparound interference signal from the correlation information detected by the complex correlator. A transmission line information controller that calculates and outputs a delay time and a correction amount for an attenuation amount and a phase rotation amount; and a delay time output from the transmission line information controller,
A correction signal generation circuit for generating the digitized correction signal for the wraparound interference signal by delaying, attenuating, and phase shifting the transmission signal based on the amount of correction of the amount of attenuation and the amount of phase rotation; Thus, the correction signal is evaluated, whereby highly accurate correction of the wraparound interference signal can be performed, and there is an effect that deterioration of the signal due to the wraparound interference signal is reduced. Further, the wraparound interference signal correction circuit detects the delay time of the signal, and the correction signal can be input to the arithmetic unit in accordance with the timing at which the corresponding received signal is input to the arithmetic unit. This has the effect of further improving the correction accuracy of the wraparound interference signal.

The wraparound interference signal correction circuit includes:
Since a plurality of canceller circuits with different delay time detection periods are provided, even if there are multiple delay waves due to multipath, it is possible to effectively correct the sneak interference signal, and to achieve stable operation and oscillation phenomena. This has the effect of providing a wireless relay device in which noise is less likely to occur.

Also, the receiving antenna for receiving a signal, a receiving amplifier for amplifying a received signal received by the receiving antenna, a reception signal output from the reception amplifier, and a digital signal A detector for outputting a received signal, a digital correction signal for the digital reception signal output from the detector, a digital correction signal, and a digital transmission signal output from the calculation device; and a digital transmission signal output from the calculation device. A modulator that generates a relay output signal based on the signal, a transmission amplifier that amplifies the relay output signal output from the modulator, and the transmission antenna that transmits the relay output signal amplified by the transmission amplifier. Generating the digital correction signal based on the digital reception signal and the digital transmission signal, and outputting the correction signal to the arithmetic unit. Because with an interference signal correction circuit,
All the correction processing including the processing in the arithmetic unit is performed by digital processing, and the accuracy of the correction processing is further improved, and an expensive high-precision analog element is not required, and the cost can be reduced. is there.

Further, the reception antenna for receiving a signal, a reception amplifier for amplifying a reception signal received by the reception antenna, and a reception signal output from the reception amplifier are detected, and an analog detection signal is detected. A detector for outputting, a calculator for calculating an analog correction signal for the detection signal output from the detector, and outputting an analog modulation signal, based on the modulation signal output from the calculator. A modulator for generating a relay output signal, a transmission amplifier for amplifying the relay output signal output from the modulator, the transmission antenna for transmitting the relay output signal amplified by the transmission amplifier, and the detector An A / D converter for converting an analog detection signal output from the A / D converter into a digitized digital reception signal, and an analog converter output from the arithmetic unit. An A / D converter for converting the signals into digitized digital transmission signal, generating a digital correction signal based on the digital receive signal and the digital transmission signal, an interference signal correction circuit narrowing the around outputs,
And a D / A converter for converting the digital correction signal output from the wraparound interference signal correction circuit into the analog correction signal and outputting the correction signal to the arithmetic unit. The correction circuit can perform digital processing, and subtraction processing of the received signal and the correction signal can be performed by analog processing in the subtractor, and quantization of the A / D converter can be performed while maintaining the accuracy of the correction signal. The number of bits can be reduced, and even when the dynamic range between the wraparound interference signal and the base station transmission signal is large, a wireless relay device capable of accurately correcting the wraparound interference signal can be obtained.

Also, the receiving antenna for receiving a signal, a receiving amplifier for amplifying a received signal received by the receiving antenna, and a correction signal modulated with respect to the received signal output from the receiving amplifier. The arithmetic unit that calculates and outputs a relay output signal, a transmission amplifier that amplifies the relay output signal output from the arithmetic unit, and the transmission antenna that transmits the relay output signal amplified by the transmission amplifier. A detector that detects a signal output from the receiving amplifier and outputs a digitized digital received signal; and a relay output signal that is output from the arithmetic unit and detects a digitized digital transmission signal. A quadrature detector for a transmission signal to be output, and a circuit for generating and outputting a digital correction signal based on the digital reception signal and the digital transmission signal. A correction signal modulator that generates the correction signal modulated based on the digital correction signal output from the wraparound interference signal correction circuit and outputs the correction signal to the arithmetic unit. The evaluation of the correction signal can be performed by digital processing in the wraparound signal correction circuit, and the subtraction processing of the received signal and the correction signal can be performed by analog processing in the subtractor, thereby maintaining the accuracy of the correction signal. Wireless relay that can reduce the number of quantization bits of the A / D converter while accurately correcting the wraparound interference signal even when the dynamic range between the wraparound interference signal and the base station transmission signal is large. There is an effect that the device can be obtained.

Further, at the time of starting the radio relay apparatus, an amplifier control circuit for suppressing the amplification gain of the transmission amplifier to a predetermined level or less until the loop interference signal correction circuit functions is provided. There is an effect that a wireless relay device in which an oscillation phenomenon hardly occurs even at the time can be obtained.

Further, a demodulator for demodulating a transmission signal output from the arithmetic unit to generate a demodulated signal between the arithmetic unit and the modulator, a demodulated signal output from the demodulator and external information An information converter that generates a new transmission signal based on the external input signal input from the input device and outputs the signal to the modulator is provided. There is an effect that a wireless relay device that can transmit after editing as a signal is obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a second embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a third embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a fourth embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a fifth embodiment of the present invention.

FIG. 6 is a block diagram illustrating a configuration according to a sixth embodiment of the present invention.

FIG. 7 is an external view illustrating a configuration of a conventional wireless relay device.

FIG. 8 is a block diagram illustrating a configuration of a conventional wireless relay device.

[Explanation of symbols]

 Reference Signs List 1 directional receiving antenna (receiving antenna) 2 receiving amplifier 3 quadrature detector (detector) 3a A / D converter 4 subtractor (arithmetic unit) 5 quadrature modulator (modulator) 5a D / A converter 6 transmission Credit amplifier 7 directional transmission antenna (transmission antenna) 8 complex correlator 9 transmission line information controller 10 buffer memory 11 delay tap (delay circuit) 12 attenuator 13 phase shifter 14 wraparound interference signal correction circuit 15 correction signal generation circuit Reference Signs List 16 first canceller circuit 23 quadrature detector (detector) 23a A / D converter 24 subtractor (arithmetic unit) 24a D / A converter 25 quadrature modulator (modulator) 25a A / D converter 26 second 31 Canceller circuit for transmission 31 Quadrature detector for transmission signal 31a A / D converter 32 Correction signal modulator 32a D / A converter 34 Subtractor (arithmetic unit) 36 Third canceller circuit Path 41 amplifier control circuit 51 demodulator 52 external information input device 53 information converter 54 signal switch

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference)

Claims (10)

[Claims] 1. A receiving antenna for receiving a signal, an arithmetic unit for calculating a correction signal for the received signal received by the receiving antenna and outputting a transmission signal, and a transmission signal output from the arithmetic unit. By detecting correlation information between the transmitting antenna to be transmitted and the received signal received by the receiving antenna and the transmitted signal transmitted from the transmitting antenna, the sneaking interference signal wrapping around from the transmitting antenna to the receiving antenna is detected. A wraparound interference signal correction circuit that detects transmission path information and generates and outputs the correction signal corresponding to the wraparound interference signal by correcting a transmission signal transmitted from the transmission antenna based on the transmission path information. A wireless relay device comprising: 2. A complex correlator for detecting a correlation between the digitized reception signal and the transmission signal, wherein the loop interference signal correction circuit includes: a complex correlator for detecting a correlation between the digitized reception signal and the transmission signal; A transmission line information controller that detects a delay time, an attenuation amount, and a phase rotation amount of a signal, calculates and outputs a correction amount for the delay time, the attenuation amount, and the phase rotation amount, and a delay output from the transmission line information controller. A correction signal generation circuit for generating the digitized correction signal for the wraparound interference signal by delaying, attenuating, and phase shifting the transmission signal based on the amount of correction of the time, the amount of attenuation and the amount of phase rotation, The wireless relay device according to claim 1, wherein the evaluation of the correction signal is performed by digital processing. 3. A circulating interference signal correction circuit, comprising: a complex correlator for detecting a correlation between the digitized reception signal and the transmission signal; and a circulating signal based on correlation information detected by the complex correlator. A transmission line information controller that detects a delay time, an attenuation amount, and a phase rotation amount of the embedded interference signal, and calculates and outputs a correction amount for the delay time, the attenuation amount, and the phase rotation amount; and a signal output from the transmission line information controller. And a correction signal generation circuit for generating the digitized correction signal for the wraparound interference signal by delaying, attenuating, and phase shifting the transmission signal based on the correction amount of the delay time, the amount of attenuation, and the amount of phase rotation. And a plurality of canceller circuits for evaluating the correction signal by digital processing, and a delay time of the complex correlator of each of the plurality of canceller circuits. The wireless relay device according to claim 1, wherein the detection periods are set in different ranges. 4. A receiving antenna for receiving a signal, a receiving amplifier for amplifying a received signal received by the receiving antenna, and a digital signal obtained by detecting a received signal output from the receiving amplifier and digitizing the received signal. A detector for outputting a received signal, a digital correction signal for the digital reception signal output from the detector, a digital correction signal, and a digital transmission signal output from the calculation device; and a digital transmission signal output from the calculation device. A modulator that generates a relay output signal based on the signal, a transmission amplifier that amplifies the relay output signal output from the modulator, and the transmission antenna that transmits the relay output signal amplified by the transmission amplifier. ,
4. The circuit according to claim 2, further comprising the wraparound interference signal correction circuit that generates the digital correction signal based on the digital reception signal and the digital transmission signal and outputs the correction signal to the arithmetic unit. 5. The wireless relay device according to claim 1. 5. A reception antenna for receiving a signal, a reception amplifier for amplifying a reception signal received by the reception antenna, and a reception signal output from the reception amplifier for detecting an analog detection signal. A detector for outputting, a calculator for calculating an analog correction signal for the detection signal output from the detector, and outputting an analog modulation signal, based on the modulation signal output from the calculator. A modulator for generating a relay output signal, a transmission amplifier for amplifying the relay output signal output from the modulator, the transmission antenna for transmitting the relay output signal amplified by the transmission amplifier, and the detector An A / D converter for converting an analog detection signal output from the A / D converter into a digitized digital reception signal, and an analog modulation signal output from the arithmetic unit An A / D converter for converting into a digitized digital transmission signal, the wraparound interference signal correction circuit for generating and outputting a digital correction signal based on the digital reception signal and the digital transmission signal, and the wraparound 4. A digital / analog (D / A) converter for converting a digital correction signal output from the interference signal correction circuit into an analog correction signal and outputting the analog correction signal to the arithmetic unit. The wireless relay device according to claim 1. 6. A receiving antenna for receiving a signal, a receiving amplifier for amplifying a received signal received by the receiving antenna, and a correction signal modulated on the received signal output from the receiving amplifier. The arithmetic unit that calculates and outputs a relay output signal, a transmission amplifier that amplifies the relay output signal output from the arithmetic unit, and the transmission antenna that transmits the relay output signal amplified by the transmission amplifier. A detector that detects a signal output from the receiving amplifier and outputs a digitized digital received signal; and a relay output signal that is output from the arithmetic unit and detects a digitized digital transmission signal. A quadrature detector for a transmission signal to be output, and the wraparound for generating and outputting a digital correction signal based on the digital reception signal and the digital transmission signal. An interference signal correction circuit, and a correction signal modulator that generates the correction signal modulated based on a digital correction signal output from the wraparound interference signal correction circuit and outputs the corrected correction signal to the arithmetic unit. The wireless relay device according to claim 2 or 3, wherein: 7. The transmission line information controller detects a delay time, an attenuation amount, and a phase rotation amount of a wraparound interference signal from the correlation information detected by the complex correlator, and averages the detected values for a predetermined time. 7. The wireless relay device according to claim 2, wherein the average value is output to the correction signal generation circuit as the correction amount. 8. An amplifier control circuit which suppresses an amplification gain of the transmission amplifier to a predetermined level or less until the wraparound interference signal correction circuit functions when the wireless relay apparatus is started. The wireless relay device according to claim 4. 9. A demodulator for demodulating a transmission signal output from the arithmetic unit to generate a demodulated signal between the arithmetic unit and the modulator, a demodulated signal output from the demodulator and external information The wireless communication device according to claim 4, further comprising: an information converter that generates a new transmission signal based on an external input signal input from an input device and outputs the generated signal to the modulator. Relay device. 10. An information storage means for storing information in the external information input device, wherein data demodulated by the demodulator is input to the information storage means via the information converter and the external information input device. Data input / output between the information converter and the information storage means so that the stored data and the data stored in the information storage means are output to the information converter via the external information input device. 10. The wireless relay apparatus according to claim 9, wherein