JPH11284544A - Transmistter-receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmitter-receiver with stable circuit quality without unnecessarily increase of the transmission power. SOLUTION: The output voltage of a transmission information signal transmitted by a transmitting means 3 is increased, if the value of a 2nd reception level signal is lower than preliminarily set threshold, when a 1st reception level signal does not satisfy prescribed value that is preliminarily set and also a line state signal shows a failure. On the other hand the output voltage of the transmission information signal transmitted by the means 3 is reduced, if the value of the 2nd reception level signal is higher than the threshold set previously.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission / reception apparatus for performing bidirectional wireless communication over a relatively short distance using a frequency affected by rainfall, for example.

[0002]

2. Description of the Related Art Conventionally, in radio communication using a frequency band affected by rainfall, a communication technique for preventing deterioration of line quality due to a decrease in reception level during rainfall is used.

Japanese Patent Laid-Open Publication No. Hei 06-37681 is an example of such a communication technique.
A technique for controlling transmission power of a transmitter of the own station is described. FIG. 3 is a block diagram showing a configuration example of a transmitting / receiving apparatus applied to communication in a frequency band affected by rainfall, which is such a prior art.

In FIG. 3, a transmission signal input from a signal input terminal 51 is modulated by a modulator 52 and supplied to a transmitter 53 having a function of varying transmission power. Transmitter 53
The transmission signal inputted to the circulator 55 is amplified.
Is transmitted as a radio signal from the transmission / reception shared antenna 56 via the common transmission / reception antenna 56 and transmitted to the opposite station.

[0005] Similarly, a radio signal is transmitted from the opposite station,
It is received by the transmission / reception shared antenna 56. The received signal received by the transmission / reception shared antenna 56 is input to the receiver 57 via the circulator 55. Receiver 57
The received signal amplified by is input to the demodulator 58,
After being demodulated here, it is output from the output terminal 59.

The output control panel 54 shown in FIG. 3 detects the reception level L _{1 of the} signal received by the receiver 57 and the line disconnection alarm S _ALM output from the demodulator 58. , The transmission power of the transmitter 53 is controlled.

[0007]

However, in such a conventional technique, even if a transmitter or the like of the opposite station fails, the failure cannot be detected. Therefore, since the transmission power is controlled in the same manner as when the rainfall is attenuated, the transmission power of the transmitter of the own station is increased although it is unnecessary. For this reason, there has been a problem that the line quality cannot be stabilized, and other systems may be affected by interference or the like.

The present invention has been made under such a background, and an object of the present invention is to provide a transmission / reception apparatus capable of obtaining stable line quality without uselessly increasing transmission power.

[0009]

According to the first aspect of the present invention, there is provided a transmitting / receiving apparatus for exchanging information signals with each other, wherein the transmitting means transmits a transmission information signal. First receiving means for receiving a received information signal and outputting a first received level signal indicating the signal strength of the received information signal; and the received information signal received by the first receiving means Demodulating means for outputting a line state signal indicating a reception state of the reception information signal and a second reception level signal indicating a signal strength of the reception information signal, and an input terminal for externally inputting the second reception level signal; Transmission power control means for controlling output power of a transmission information signal transmitted by the transmission means based on the first reception level signal, the line state signal, and the second reception level signal. The features. Further, in the invention according to claim 2, in the transmission / reception apparatus according to claim 1, the input terminal receives the reception information signal output by the second reception unit that receives the reception information signal. A second reception level signal indicating a signal strength is input. According to the third aspect of the present invention, there is provided the first aspect.
Alternatively, in the transmission / reception apparatus according to claim 2, the transmission power control means indicates that the first reception level signal exceeds a predetermined value set in advance or the line state signal indicates good. If there is, the output power of the transmission information signal transmitted by the transmission means is controlled based on the value of the first reception level signal. Also, in the invention according to claim 4, in the transmission / reception apparatus according to any one of claims 1 and 2, the transmission power control means sets the first reception level signal in advance. If the predetermined value is not satisfied and the line status signal indicates a failure, controlling the output power of the transmission information signal transmitted by the transmission means based on the value of the second reception level signal. Features. According to another aspect of the present invention, there is provided a transmitting and receiving apparatus for exchanging information signals with each other, the transmitting means for transmitting the transmitting information signal, the receiving information signal being received, and the signal strength of the receiving information signal being received. First receiving means for outputting a first first reception level signal indicating an operation state and an apparatus state signal indicating an operation state of the apparatus;
Demodulation means for demodulating the reception information signal received by the reception means and outputting a line state signal indicating the reception state of the reception information signal; and a second reception level signal indicating the signal strength of the reception information signal is an external signal. Power control for controlling an output power of a transmission information signal transmitted by the transmission means based on an input terminal input from the transmitter and the first reception level signal, the line state signal, and the second reception level signal Means. According to a sixth aspect of the present invention, in the transmission / reception apparatus according to the fifth aspect, the input terminal receives the reception information signal output by the second reception unit that receives the reception information signal. A second reception level signal indicating a signal strength is input. Also, in the invention according to claim 7, in the transmission / reception apparatus according to any one of claims 5 and 6, the transmission power control means sets the first reception level signal in advance. Controlling the output power of the transmission information signal transmitted by the transmission means based on the value of the first reception level signal when the value exceeds a predetermined value or the device status signal indicates good. It is characterized by.
Also, in the invention according to claim 8, in the transmission / reception apparatus according to any one of claims 5 and 6, the transmission power control means sets the first reception level signal in advance. If the predetermined value is not satisfied and the device status signal indicates a failure, controlling the output power of the transmission information signal transmitted by the transmission unit based on the value of the second reception level signal. Features. According to the ninth aspect of the present invention, in the transmission / reception apparatus according to any one of the third and seventh aspects, the transmission power control means sets the value of the first reception level signal in advance. If the value of the first reception level signal is greater than a preset threshold, the output power of the transmission information signal transmitted by the transmission means is increased. The output power of the transmission information signal to be transmitted is reduced. Also, in the invention according to claim 10, in the transmission / reception apparatus according to any one of claims 4 and 8, the transmission power control means sets the value of the second reception level signal in advance. If the value of the second reception level signal is greater than a preset threshold, the output power of the transmission information signal transmitted by the transmission means is increased when the value is smaller than a predetermined threshold. The output power of the transmission information signal to be transmitted is reduced.

When the first reception level signal exceeds a predetermined value or when the line state signal indicates good, the transmission power control means determines that the value of the first reception level signal is good. If the value is smaller than a preset threshold, the output power of the transmission information signal transmitted by the transmission means is increased, and if the value of the first reception level signal is larger than the preset threshold, the output of the transmission information signal transmitted by the transmission means is increased. When the power is reduced and the first reception level signal does not satisfy a predetermined value and the line state signal indicates a failure, the value of the second reception level signal is set to a predetermined threshold value. If it is smaller, the output power of the transmission information signal transmitted by the transmission means is increased, and if the value of the second reception level signal is larger than a preset threshold, the output power of the transmission information signal transmitted by the transmission means is increased. Reducing the power of power. Further, the transmission power control means sets the value of the first reception level signal to a preset value when the first reception level signal exceeds a predetermined value or when the device state signal indicates good. If the value is smaller than the threshold, the output power of the transmission information signal transmitted by the transmission means is increased. If the value of the first reception level signal is larger than a preset threshold, the output power of the transmission information signal transmitted by the transmission means is increased. When the first reception level signal does not satisfy a predetermined value and the device status signal indicates a failure, the value of the second reception level signal is smaller than a predetermined threshold value. If the value of the second reception level signal is larger than a preset threshold, the output power of the transmission information signal transmitted by the transmission means is increased. Decrease.

[0011]

DETAILED DESCRIPTION OF THE INVENTION First Embodiment Hereinafter, the present invention will be described. FIG. 1 is a block diagram illustrating a configuration of the transmitting and receiving apparatus according to the first embodiment of the present invention. In the transmission / reception device 10 shown in FIG. 1, a transmission signal input from a signal input terminal 1 is modulated by a modulator 2,
It is supplied to a transmitter 3 having a function of varying transmission power.

The transmission signal input to the transmitter 3 is amplified and transmitted as a radio signal by the transmission / reception antenna 6 via the circulator 5 and the transmission signal is transmitted to the opposite station.

On the other hand, a radio signal is similarly transmitted from the opposite station, and a reception signal is received by the transmission / reception shared antenna 6. This received signal is input to the receiver 7 via the circulator 5. The signal amplified by the receiver 7 is output to the demodulator 8
And demodulated, and output from the signal output terminal 9.

The output control panel 4 receives the reception level signal S _L1 output from the receiver 7 and the line disconnection alarm signal A _LARM output from the demodulator 8. The control input terminal 11 receives a reception level signal S _L2 from another radio receiver 20 that uses radio waves in the same or higher frequency band as the present embodiment, and also controls the output of the reception level signal S _L2. It is supplied to the panel 4. The output control panel 4 controls the transmission power of the transmitter 3 based on these input signals.

In FIG. 1, the transmission power control panel 4 constantly monitors the reception level signal S _L1 output from the receiver 7.
Thereby, when the value of the reception level signal S _L1 is sufficiently high, the transmission power of the transmitter 3 is reduced, and when the value of the reception level signal S _L1 falls below a preset threshold,
The transmission power of the transmitter 3 is increased.

In transmission power control for compensating for a decrease in reception level due to fading or the like due to multipath or the like, information on the reception level of the receiver of the opposite station is detected and the transmitter of the own station is controlled.

On the other hand, when considering the decrease in the reception level due to the influence of rainfall, the influence of the rainfall at the opposite station can be regarded as the same as the level decrease at the own station. It is possible to control the transmitter based on the level.

The transmission power control panel 4 receives the reception level signal S _L1
Is significantly reduced and the line break alarm signal A _LARM is output from the demodulator 8, the reception level signal S _L2 input from the receiver 20 via the control input terminal 11 is monitored.

The relationship between the reception level signal S _L2 and the actual reception level is grasped in advance based on the characteristics. At this time, assuming that the value of the reception level signal S _L1 is reduced due to the influence of rainfall, the value of the reception level signal S _L2 should also be reduced.

On the other hand, when the value of the reception level signal S _L2 is high even though the value of the reception level signal S _L1 is low,
This can be determined to be due to a failure of the transmitter or the like of the opposite station. At this time, the transmission power control panel 4 outputs the reception level signal S
The output power of the transmitter 3 is controlled based on the value of _L2 .

B. Second Embodiment FIG. 2 is a block diagram showing a configuration of a transmitting / receiving device according to a second embodiment of the present invention. In the transmission / reception device 10a shown in FIG. 2, the transmission signal input from the signal input terminal 1 is modulated by the modulator 2 and supplied to the transmitter 3 having a variable transmission power function.

The transmission signal input to the transmitter 3 is amplified and transmitted as a radio signal by the transmission / reception antenna 6 via the circulator 5, and the transmission signal is transmitted to the opposite station.

On the other hand, a radio signal is similarly transmitted from the opposite station, and a reception signal is received by the transmission / reception shared antenna 6. This received signal is input to the receiver 7a via the circulator 5. The signal amplified by the receiver 7a is input to the demodulator 8, and after being demodulated, is output from the signal output terminal 9.

The output control panel 4a receives, via a control input terminal 11, a reception level signal S _L1 output from the receiver 7a.
A reception level signal S _L2 output from another wireless receiver 20 using radio waves in the same or higher frequency band as in the present embodiment is input.

The output control panel 4a receives the equipment failure signal S _ALM1 output from the receiver 7a and the line break alarm signal S _ALM2 output from the demodulator 8. Output control panel 4a
Controls the transmission power of the transmitter 3 based on these input signals.

In FIG. 2, the transmission power control panel 4a constantly monitors the reception level signal S _L1 output from the receiver 7a. As a result, when the value of the reception level signal S _L1 is sufficiently high, the transmission power of the transmitter 3 is reduced, and when the value of the reception level signal S _L1 falls below a preset threshold, the transmission power of the transmitter 3 is reduced. Increase transmission power.

In transmission power control for compensating for a decrease in the reception level due to fading or the like due to multipath or the like, information on the reception level of the receiver of the opposite station is detected and the transmitter of the own station is controlled.

On the other hand, when considering the decrease in the reception level due to the influence of rainfall, the influence of the rainfall at the opposite station can be regarded as the same as the level decrease at the own station. It is possible to control the transmitter based on the level.

The transmission power control panel 4a receives the reception level signal S
_{When L1} is significantly reduced and the line break alarm signal S _ALM2 is output from the demodulator 8, the reception level signal S _L2 input from the receiver 20 via the control input terminal 11 is monitored.

As to the reception level signal S _L2 , the relationship with the actual reception level is grasped in advance based on the characteristics. At this time, assuming that the value of the reception level signal S _L1 is reduced due to the influence of rainfall, the value of the reception level signal S _L2 should also be reduced.

On the other hand, when the value of the reception level signal S _L2 is high even though the value of the reception level signal S _L1 is low,
This can be determined to be due to a failure of the transmitter or the like of the opposite station. At this time, the transmission power control panel 4a controls the output power of the transmitter 3 based on the value of the reception level signal _SL2 .

Further, in the present embodiment, the transmission power control panel 4a constantly monitors the device failure signal S _ALM1 output from the receiver 7a. Then, even when the device failure signal S _ALM1 is detected, the transmission power control panel 4a controls the output power of the transmitter 3 based on the reception level signal S _L2 output from the receiver 20.

In the present embodiment, stable transmission power control is possible even when the receiver of the own station fails, and more stable channel quality is obtained, and interference with other transceivers is reduced. .

[0034]

As described above, according to the present invention, the transmission power control means determines whether the first reception level signal exceeds a predetermined value or the line state signal indicates good. In this case, if the value of the first reception level signal is smaller than a preset threshold, the output power of the transmission information signal transmitted by the transmission means is increased, and the value of the first reception level signal is preset. If it is larger than the threshold, the output power of the transmission information signal transmitted by the transmission means is reduced, and if the first reception level signal does not satisfy a predetermined value set in advance and the line state signal indicates a failure, If the value of the second reception level signal is smaller than a preset threshold, the output power of the transmission information signal transmitted by the transmitting means is increased, and the value of the second reception level signal is larger than the preset threshold. Transmitting means reduces the output power of the transmission information signal to be transmitted if Kere. Further, the transmission power control means sets the value of the first reception level signal to a preset value when the first reception level signal exceeds a predetermined value or when the device state signal indicates good. If the value is smaller than the threshold, the output power of the transmission information signal transmitted by the transmission means is increased. If the value of the first reception level signal is larger than a preset threshold, the output power of the transmission information signal transmitted by the transmission means is increased. When the first reception level signal does not satisfy a predetermined value and the device status signal indicates a failure, the value of the second reception level signal is smaller than a predetermined threshold value. If the value of the second reception level signal is larger than a preset threshold, the output power of the transmission information signal transmitted by the transmission means is increased. Because it reduces, without increasing unnecessarily transmit power, the effect is obtained that stable transceiver channel quality is obtained can be realized.

That is, according to the present invention, even when the transmission system equipment of the opposite station fails, the transmission power of the own station transmitter can be controlled by detecting the reception level of the receiver of the other system. It is possible to always obtain stable line quality.

Further, according to the present invention, even when the equipment in the transmission system of the opposite station fails, the transmission power of the own station can be controlled by detecting the reception level of the receiver of the other system. Therefore, since the transmission power is not increased except when necessary, interference with the lines of other systems is reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a transmission / reception device according to a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a transmission / reception device according to a second embodiment of the present invention.

FIG. 3 is a block diagram illustrating a configuration example of a transmission / reception device applied to communication in a frequency band affected by rainfall.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Signal input terminal 2 Modulator 3 Transmitter (transmission means) 4, 4a Transmission power control board (transmission power control means) 5 Circulator 6 Transmitting / receiving antenna 7, 7a Receiver (first receiving means) 8 Demodulator (second 1 demodulation means) 9 signal output terminal 10 transceiver 10a transceiver 11 control input terminal (input terminal) 20 receiver (second reception means) 51 signal input terminal 52 modulator 53 transmitter 54 transmission power control panel 55 circulator 56 Dual-use antenna 57 Receiver 58 Demodulator 59 Signal output terminal

Claims (10)

[Claims] 1. A transmitting / receiving apparatus for exchanging information signals with each other, comprising: a transmitting means (3) for transmitting a transmission information signal; and a first first means for receiving a reception information signal and indicating a signal strength of the reception information signal. First receiving means (7) for outputting one reception level signal; and demodulating the received information signal received by the first receiving means and outputting a line state signal indicating a reception state of the received information signal. Demodulation means (8); an input terminal (11) to which a second reception level signal indicating the signal strength of the reception information signal is externally input; the first reception level signal, the line state signal, and the A transmission power control unit (4) for controlling output power of a transmission information signal transmitted by the transmission unit based on the second reception level signal. 2. A second reception level signal indicating a signal strength of the reception information signal output from a second reception unit (20) receiving the reception information signal is input to the input terminal. The transmission / reception device according to claim 1, wherein: 3. The transmission power control means, if the first reception level signal exceeds a predetermined value or if the line state signal indicates good, 3. The transmission / reception apparatus according to claim 1, wherein output power of a transmission information signal transmitted by the transmission unit is controlled based on a value of a reception level signal. 4. The transmission power control means, when the first reception level signal does not satisfy a predetermined value set in advance and the line state signal indicates a failure, 3. The transmission / reception apparatus according to claim 1, wherein output power of a transmission information signal transmitted by the transmission unit is controlled based on a value of a level signal. 5. A transmitting and receiving apparatus for exchanging information signals with each other, comprising: transmitting means for transmitting a transmitting information signal; and first and first receiving means for receiving the receiving information signal and indicating the signal strength of the receiving information signal. First receiving means (7a) for outputting a level signal and a device state signal indicating the operation state of the device; and a receiving state of the received information signal while demodulating the received information signal received by the first receiving means. Demodulation means for outputting a line state signal indicating the following: an input terminal to which a second reception level signal indicating the signal strength of the reception information signal is externally input; and a first reception level signal and the line state signal. A transmission power control unit (4a) for controlling output power of a transmission information signal transmitted by the transmission unit based on the second reception level signal. . 6. The input terminal receives a second reception level signal indicating the signal strength of the reception information signal output by a second reception unit that receives the reception information signal. The transmission / reception device according to claim 5. 7. The transmission power control means, when the first reception level signal exceeds a predetermined value set in advance or when the device state signal indicates good, 7. The transmission / reception apparatus according to claim 5, wherein output power of a transmission information signal transmitted by the transmission unit is controlled based on a value of a reception level signal. 8. The transmission power control means, when the first reception level signal does not satisfy a predetermined value set in advance and the device status signal indicates a failure, 7. The transmission / reception apparatus according to claim 5, wherein output power of a transmission information signal transmitted by the transmission unit is controlled based on a value of a level signal. 9. The transmission power control unit increases output power of a transmission information signal transmitted by the transmission unit when a value of the first reception level signal is smaller than a preset threshold. The output power of the transmission information signal transmitted by the transmission means is reduced when the value of the first reception level signal is larger than a preset threshold value.
A transmission / reception device according to claim 7. 10. The transmission power control unit, when the value of the second reception level signal is smaller than a preset threshold, increases the output power of a transmission information signal transmitted by the transmission unit, 5. The output power of the transmission information signal transmitted by the transmitting means when the value of the second reception level signal is larger than a preset threshold value.
A transmission / reception device according to claim 8.