JP2560617B2 - Hot standby transmission / reception system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot standby transmission / reception system, and more particularly to a hot standby transmission / reception system using one of a plurality of transmission systems in operation and one of a plurality of reception systems in operation. Transmission and reception system.

[0002]

2. Description of the Related Art FIG. 3 is a block diagram showing an example of a conventional hot standby transmission / reception system. In the figure, the information signal input from the input terminal 1 is branched into two by the signal distributor 2, one is supplied to the first digital processing unit 3 and the other is supplied to the second digital processing unit 4. . The digital information signal extracted from the first digital processing unit 3 is modulated by the modulator 5 and then modulated by the first transmitter 7
To the first modulated wave of the carrier wave in the microwave band. Similarly, the digital information signal extracted from the second digital processing unit 4 is input to the second transmitter 8 through the modulator 6 and is converted into a second modulated wave of a microwave carrier.

The first and second modulated waves extracted from the transmitters 7 and 8 are input to a switch 24. Here, the switch 24 is provided with the digital processing units 3 and 4,
The signals from the modulators 5 and 6 and the transmitters 7 and 8 are received as input signals, and switching control is performed by a control signal from a switching control panel 23 that generates a control signal based on these signals,
One of the first and second modulated waves is selected and output to the transmitting antenna 25. The microwave band transmission signal radiated from the transmitting antenna 25 is received by the receiving antenna 26 and then branched into two by the distributor 27, one of which is input to the first receiver 12 and the other of which is the second. Receiver 13
Is input to The signal received by the first receiver 12 is demodulated by the first demodulator 16 into a digital signal, and then converted into an original baseband information signal by the digital processing unit 18. Similarly, the reception signal extracted from the second receiver 13 is converted into the original baseband information signal through the second demodulator 17 and the second digital processing unit 19.

The information signals of the respective basebands extracted from the digital processing units 18 and 19 are the transmission quality detected from the receivers 12 and 13, the demodulators 16 and 17, and the digital processing units 18 and 19, and One is selected and output to the output terminal 22 by the switching device 21 controlled by the output signal of the switching control panel 28 to which the alarm signal is input.

[0005]

However, in the above-described conventional hot standby transmission / reception system, since the switching unit 24 is required on the transmission side, the transmission gain is reduced by the circuit loss. Further, in the conventional hot standby transmission / reception system, one of the output transmission signals of the transmitters 7 and 8 in the operating state is selected and transmitted by the switch 24, so that the transmission quality of the transmission signal of the unselected one is It cannot be monitored on the receiving side.

The present invention has been made in view of the above points,
To provide a hot standby transmission / reception system that solves the above-mentioned problems by transmitting and receiving first and second transmission signals in mutually orthogonal polarized waves and lowering the level of the transmission signal of a transmission system that is not transmitting. With the goal.

[0007]

In order to achieve the above-mentioned object, the present invention divides an input information signal into two and inputs them to a first and a second transmission system, respectively, to obtain a first and a second transmission signal. A transmitting circuit unit for converting, a transmitting dual antenna for transmitting the first and second transmitting signals by using first and second polarized waves orthogonal to each other, and receiving for receiving the first and second polarized waves Dual antenna, first and second receivers for obtaining first and second received signals based on the first and second polarized waves received by the dual antenna for reception, and first and second receivers, respectively. The configuration includes a first switch for selecting one of the received signals, a receiving circuit section and a switching control board.

Here, the reception circuit section divides the output reception signal of the first switching device into two and inputs them to the first demodulation processing system and the second demodulation processing system, respectively, and inputs them to the first and second demodulation processing systems. A demodulation signal is generated and one of the first and second demodulation signals is output through the second switch. The switching control board controls the first and second switching devices based on the output signals of the receiving circuit unit and the first and second receivers.

[0009]

In the present invention, the first and second transmission signals are simultaneously transmitted and received by the dual antenna for transmission and the dual antenna for reception by using the first and second polarized waves. It is possible to eliminate the need for the transmission switcher, which was necessary because one of the transmission signals was transmitted.

The switching control board is based on not only the output signals of the receiving circuit section but also the first and second received signals obtained by the first and second receivers, respectively. Since the first and second switching devices are switched and controlled, the switching control can be performed based on the reception signals of both systems.

Further, in the present invention, the transmission circuit section has an output control panel for variably controlling the levels of the first and second transmission signals, and the switching control panel is selected by the first switching device. Since the output control panel is controlled so as to lower the transmission signal level of the transmission system that is not selected, the transmission signal of the transmission system that is not selected is transmitted to the transmission signal of the transmission system that is selected. Leakage from the signal in the propagation path can be reduced.

[0012]

FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, the same components as those in FIG.
The description is omitted. In FIG. 2, the transmitting device is divided into a first transmitting system and a second transmitting system, and a transmitter 7 provided in the first transmitting system and a transmitter 8 provided in the second transmitting system. Are controlled by the output control board 9 respectively.
The transmission output level is variably controlled. Further, the dual antenna for transmission 10 and the dual antenna for reception 11 are
Each of them is configured to transmit or receive vertical polarization and horizontal polarization.

Further, the receiving device is divided into a first receiving system and a second receiving system, and a receiver 12 and a second receiving system of the first receiving system are provided.
Both output reception signals of the receiver 13 of the receiving system are selected by the switcher 14. The latter stage of the switch 14 is the receiving circuit unit, and is provided on the output side of the distributor 15 which branches the input received signal into
It comprises a first demodulation processing system including a demodulator 16 and a digital processing unit 18, a second demodulation processing system including a demodulator 17 and a digital processing unit 19, and a switching control board 20.

The switching control board 20 controls the two switching devices 14 and 21 in the receiving device based on the output signals of the receivers 12 and 13, the demodulators 16 and 17, and the digital processing parts 18 and 19, while transmitting the signals. The output control board 9 in the device is controlled.

Next, the operation of this embodiment will be described.
The baseband information signal input from the input terminal 1 is
As in the conventional case, it is branched into two by the distributor 2, one of which is input to the transmitter 7 through the first transmission system digital processing unit 3 and the modulator 5, and the other of which is input to the second transmission system digital processing unit 4 and It is input to the transmitter 8 through the device 6.

The first and second modulated waves having the carrier waves in the microwave band respectively extracted from the transmitters 7 and 8 are supplied to the dual antenna 10 for transmission, and the first modulated wave is, for example, a vertically polarized wave. And the second modulated wave is transmitted using horizontally polarized waves. Therefore, in this embodiment, the transmission signals in the first and second microwave bands extracted from the two transmission systems are transmitted simultaneously.

Here, the information indicating which system of the transmitted waves of the transmitted waves the received signal of which is not selected by the switch 14 (that is, the information of which system is the spare) is the switch 14. Since it is supplied to the output control panel 9 from the switching control panel 20 which controls, the output control panel 9 is based on this, and the output control panel 9 of the transmitter of the transmitters 7 and 8 which is not selected by the switch 14 is used. The output signal level is reduced below a predetermined value.

As a result, even if the transmission waves in the first and second microwave bands extracted from the two transmission systems are simultaneously transmitted, the output level of the transmission wave of the system not selected by the receiving device is set. As a result, the leakage in the propagation path from the transmission wave of the unselected system to the transmission wave of the selected system can be reduced.

Of the vertically polarized waves and the horizontally polarized waves received by the receiving dual antenna 11, the vertically polarized received signal is the first
Is input to the receiver 12 of the receiving system, and the reception signal of the horizontally polarized wave is input to the receiver 13 of the second receiving system. Therefore, the reception signal corresponding to the output modulated wave of the modulator 5 of the first transmission system is extracted from the receiver 12, and the second reception signal from the receiver 13 is extracted.
The reception signal corresponding to the output modulated wave of the modulator 6 of the transmission system is extracted. These received signals are sent to the switch 1
4 respectively.

The switch 14 selects the received signal of the system having the larger received signal level from these two input received signals by the control signal from the switching control board 20. This is because, as described above, the output signal level of the transmitter of the system not selected by the switcher 14 among the transmitters 7 and 8 is lowered to a predetermined value or less and is transmitted. The received signal level of the transmitted wave of the selected system is usually higher than the received signal level of the transmitted wave of the unselected system, and is selected for the transmitted wave of the unselected system. This is because only the transmission wave of the system having a good line quality is selected, because the leakage from the transmission wave of the system having one of the lines becomes large in the propagation path and the line quality deteriorates.

Next, the switching control panel 20 which is the main part of this embodiment.
The control operation of will be further described with reference to the flowchart of FIG. The switching control board 20 switches the switching device 14 by the procedure shown in FIG. Now, it is assumed that the switches 14 and 20 have selected the first transmission system and the first reception system (denoted as A).

First, in the switching control board 20, the reception level of A from the receiver 12 is lower than the reception levels from the receivers 13 of the second transmission system and the second reception system (this is referred to as B). Or, whether or not the working receiver 12 has failed is constantly monitored (step 101), and when the above-mentioned deterioration or failure occurs, the transmission level of B is changed to switch B from standby to working. At the same time as controlling the transmitters 7 and 8 via the output control panel 9 so as to raise and lower the transmission level of A, the switch 14 is switched to B, that is, the receiver 13.
The output reception signal of is switched so as to be selected (step 102).

Subsequently, the switching control board 20 determines whether the reception level of B from the receiver 13 which has been switched to the active side is lower than the reception level from the receiver 12 of A, or the active receiver 13 is turned on. Whether or not a failure has occurred is constantly monitored (step 103). When the reception level of B is lower than the reception level of A or when the working receiver 13 fails, whether the switching control panel 20 can raise the transmission level of A is determined via the output control panel 9. The transmitter 7 is controlled (step 104).

If the received signal level (received electric field strength) of the receiver 13 does not rise despite the control to increase the transmission level of the transmitter 7, it is judged that the failure is complete. On the other hand, when the reception signal level (reception electric field strength) of the receiver 13 rises, the transmitter 8 is controlled via the output control panel 9 so that the transmission level of B is lowered, and the switch 14 is switched to the direction A. That is, the output signal of the receiver 12 is switched to be selected (step 105). This allows
This time, A becomes the current one. Then, the operation returns to step 101 again.

The switching control board 20 also switches the switching device 21 in parallel with the switching of the switching device 14. First, in the switching control board 20, which one of the switching control board 20 is out of order or the bit error rate depends on the signal from the demodulator 16 of the current A or the digital processing unit 18,
No. 7 bit error rate is being monitored, and the failure or bit error rate is monitored by the demodulator 17
When it is determined that the output signal is further decreased, the switching control panel 20 switches the switch 21 to select the output signal of the B digital processing unit 19.

After that, the switching control board 20 performs the same monitoring and switching control as described above for the demodulator 17 of B or the digital processing unit 19. In addition, normally, when the switch 14 or 21 is switched, the failure is corrected.

As described above, according to the present embodiment, the transmission side gain can be increased by the amount that the transmission switching device is unnecessary. Further, since the switching control board 20 controls the output control board 9 based on the reception signals of both systems, it is possible to constantly monitor the device failure mode of both systems.

The means for transmitting the control information from the switching control panel 20 to the output control panel 9 may be wired, or a dedicated antenna or dual antenna 1 may be used.
Alternatively, 0 and 11 may be used for both transmission and reception, and may be wirelessly transmitted on the auxiliary signal bit.

[0029]

As described above, according to the present invention,
Since it is possible to eliminate the need for the transmission switcher, which was required for transmitting either one of the transmission signals in the past,
The transmission side gain can be increased by the circuit loss.

Further, since the switching control is performed based on the reception signals of both systems, both device failure modes can be constantly monitored. Further, according to the present invention, by lowering the transmission signal level of the transmission system which is not selected, the transmission signal of the transmission system which is not selected with respect to the transmission signal of the transmission system which is selected. Since the leak in the propagation path is reduced, the line quality can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram of one embodiment of the present invention.

FIG. 2 is a flowchart for explaining an operation of a main part of FIG.

FIG. 3 is a block diagram of a conventional example.

[Explanation of symbols]

 2, 15 distributor 3, 4 transmission side digital processing unit 5, 6 modulator 7, 8 transmitter 9 output control board 10 transmission dual antenna 11 reception dual antenna 12, 13 receiver 14 reception signal switcher 16, 17 Demodulator 18, 19 Digital Processing Unit on Receiving Side 20 Switching Control Board 21 Demodulation Signal Switching Device

Claims (2)

(57) [Claims] 1. An input information signal is divided into two and divided into first portions.
Input to the second transmission system and the second transmission system, converted into the first transmission signal by the first transmission system, and converted into the second transmission signal by the second transmission system.
A transmission circuit unit for converting the transmission signal into a transmission signal, and a transmission dual antenna for transmitting the first and second transmission signals from the transmission circuit unit using first and second polarized waves orthogonal to each other, A dual receiving antenna for receiving first and second polarized waves; a first receiver for obtaining a first received signal based on the first polarized wave received by the dual receiving antenna; A second receiver for obtaining a second received signal based on the second polarized wave received by the dual antenna for use, and a first switcher for selecting one of the first and second received signals, The received signal output from the first switching device is divided into two and input to a first demodulation processing system and a second demodulation processing system, respectively, to generate first and second demodulation signals, and the first and second demodulation signals are generated. A receiving circuit section for outputting one of the two demodulated signals through a second switching device; A hot standby transmission / reception system, comprising: a road section and a switching control panel that controls the first and second switching units based on output signals of the first and second receivers. 2. The transmission circuit unit has an output control panel for variably controlling the levels of the first and second transmission signals, and the switching control panel is not selected by the first switching unit. 2. The hot standby transmission / reception system according to claim 1, wherein the output control panel is controlled so as to lower the transmission signal level of the transmission system of the above.