JP4627080B2 - Wireless communication system - Google Patents

Description

  The present invention relates to a radio communication system, and more particularly to transmission output control in a radio communication system that forms a two-route microwave communication line using orthogonal vertical polarization and horizontal polarization.

  Normally, when a two-route microwave communication line is configured using vertical polarization (V polarization) and horizontal polarization (H polarization) orthogonal to each other, the reception level of the opposite station can be maintained at a constant value. Thus, a transmission output control system (ATPC system) that automatically controls transmission output is widely adopted. In the transmission output control method, a reception level threshold is provided in the receiving apparatus, and when the reception level drops below the threshold, the transmission output of the opposite station is controlled so as to compensate for the reduction. At this time, in order to prevent signal degradation due to cross-polarization interference, it is common to simultaneously control the transmission output of the V polarization and the H polarization.

  Also, because of the versatility and shortening of the design period, the V polarization device and the H polarization device are often separate devices, so either device has a transmission output control unit, and transmission output control. The transmission output of both devices is simultaneously controlled from the unit. FIG. 3 is a block diagram showing a conventional example of this type of wireless communication system (see, for example, Patent Document 1).

  In FIG. 3, the V polarization transmission device 10 modulates an input signal by the modulation unit 11 and amplifies the signal output from the modulation unit 11 by the transmission unit 12. In addition, the H polarization transmission device 20 modulates the input signal by the modulation unit 21 and amplifies the signal output from the modulation unit 21 by the transmission unit 22. Then, the output signals of the transmission unit 12 and the transmission unit 22 are combined and transmitted from the transmission antenna.

  This transmission signal is received by the antenna of the opposite station, separated into V polarization and H polarization, amplified by the reception units 31 and 41, and demodulated by the demodulation units 32 and 42, respectively. The level detection unit 35 of the V polarization receiving device 3 detects the reception levels of the reception unit 31 and the reception unit 41, and either one of the reception levels of the reception unit 31 and the reception unit 41 is lower than a predetermined level. Is lower, output level information is output to the modulation unit 34 so as to increase the output level of the transmission units 12 and 22 of the opposite station in order to compensate for the decrease, and the V polarization transmission device 10 is used using a radio line. To the output control unit 15 via the demodulation unit 13.

  When the output control unit 15 of the V polarization transmitting device 10 receives the output level information transmitted from the level detection unit 35 of the opposite station, the output control unit 15 calculates the output control value from the received output level information, At the same time, output control values are output to 22 and the output levels of the transmission units 12 and 22 are controlled in accordance with the input output control values, so that the output levels of the V polarization transmission device 10 and the H polarization transmission device 20 are controlled. Control at the same time. As a result, the leakage amount from the V polarization to the H polarization and the leakage amount from the H polarization to the V polarization can be kept at the same level, thereby preventing cross polarization interference.

  In addition, the level detector on the receiving side is provided in both the receiver for V polarization and the receiver for H polarization, and the output controller is provided in both the transmitter for V polarization and the transmitter for H polarization, A technique for controlling transmission power for both V and H polarized waves when the received power for either V or H polarized waves decreases is also known (see, for example, Patent Document 2).

JP-A-4-137934 (2nd page, FIG. 1) JP 2003-298546 A (2nd page, FIGS. 7 and 8)

  However, in the conventional transmission output control method described above, when the output level information generated by the level detection unit of the opposite station cannot be received, transmission output control cannot be performed for both the V polarization transmission device and the H polarization transmission device. There is a problem. Therefore, for example, when an abnormal communication state or equipment failure occurs on the V polarization side, the output level on the H polarization side that is normally communicating becomes uncontrollable, and both V polarization and H polarization lines are connected. Quality will deteriorate.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a wireless communication system capable of solving the above-described problems and preventing line quality deterioration even when a communication state abnormality or equipment failure occurs.

  The wireless communication system of the present invention is a wireless communication system that forms a two-route microwave communication line using orthogonal vertical polarization and horizontal polarization. A level detection unit that detects the reception level and transmits output level information to the transmission side wireless communication device of the route when either one of the two reception levels is lower than a predetermined level is provided, and the transmission side wireless Corresponding to the two routes of the communication device, the output level information transmitted from the level detection unit is received, the output control value is calculated from the received output level information, and the output control value is simultaneously output to the transmission unit of the two routes. By doing so, the output control unit that simultaneously controls each output level to compensate for the decrease, and one of the output control units is switched to be used as the active system and the other as the standby system. Is provided with a control determination unit of the control two routes corresponds.

  Specifically, the standby control determination unit periodically monitors whether the output level information transmitted from the level detection unit is normally received, and operates a communication status flag indicating whether it is normally received. The system control determination unit periodically monitors whether the output level information transmitted from the level detection unit is normally received, and the monitoring result and the communication status flag Switch between the active system and the standby system according to the information.

  In addition, as a basic form, the standby control determination unit periodically monitors whether the output level information transmitted from the level detection unit is normally received, and indicates whether it is normally received or not The flag is transmitted to the active control determination unit as a basic form, and the active control determination unit periodically monitors whether the output level information transmitted from the level detection unit is normally received, Switching between the active system and the standby system is performed based on the monitoring result and the communication status flag information.

  Further, switching between the active system and the standby system is performed when abnormal reception in the active system and normal reception in the standby system continue for a predetermined time or more.

  In addition, as a basic form, when the standby output control unit functions as the active system, as a basic form, if the active system control determination unit cannot receive the communication status flag normally, the basic form is the standby system. As a basic form, the output control unit on the operation side functions as the operation system.

  As described above, according to the present invention, in transmission output control realized in a two-route microwave communication system using V polarization and H polarization orthogonal to each other, an operation system is selected according to the communication state. By switching between the output control unit and the standby system, even if one of the V-polarized wave and the H-polarized wave is abnormal in communication, it is possible to prevent deterioration of the line quality between the devices in which communication is normal. Will be able to.

Next, embodiments of the present invention will be described with reference to the drawings.
[Description of configuration]
FIG. 1 is a block diagram showing a configuration of a wireless communication system according to an embodiment of the present invention. In FIG. 1, this wireless communication system includes a transmitting-side V polarization transmitting device 1 and an H-polarizing transmitting device 2, a receiving-side V-polarizing receiving device 3, and an H-polarizing receiving device 4. Has been. Here, “˜transmitting device” and “˜receiving device” are described. Actually, both devices are “˜transmitting / receiving devices”, but they function as a transmitting side and a receiving side, respectively, in the explanation of the invention. Until it was named like that.

  The radio communication devices on the transmission side (V-polarization transmission device 1 and H-polarization transmission device 2) include modulation units 11 and 21, transmission units 12 and 22, demodulation units 13 and 23, reception units 14, 24, output control units 15 and 25, and control determination units 16 and 26. The radio communication devices on the receiving side (the V polarization receiving device 3 and the H polarization receiving device 4) include reception units 31, 41, demodulation units 32, 42, transmission units 33, 43, modulation units 34, 44 and level detectors 35 and 45.

  On the transmission side, the modulators 11 and 21 modulate the signals input from the input terminals, respectively. The transmission unit 12 amplifies the output signal of the modulation unit 11, the transmission unit 22 amplifies the output signal of the modulation unit 21, and the output signal of the transmission unit 12 and the output signal of the transmission unit 22 are combined and transmitted via a transmission antenna. Are transmitted to the wireless communication device on the receiving side. The output terminal is used when these wireless communication devices function as a receiving side.

  On the receiving side, the receiving units 31 and 41 receive and amplify the signals separated into the V polarization and the H polarization through the receiving antenna, respectively. The demodulator 32 demodulates the signal amplified by the receiver 31 and outputs it from the output terminal. The demodulator 42 demodulates the signal amplified by the receiver 41 and outputs it from the output terminal. The input terminal is used when these wireless communication devices function as a transmission side.

  The level detection unit 35 of the V polarization receiving device 3 detects the reception levels of the reception unit 31 and the reception unit 41, and either one of the reception levels of the reception unit 31 and the reception unit 41 is higher than a predetermined level. If it is too low, output level information is output to the modulation unit 34 so as to increase the output level of the transmission units 12 and 22 of the opposite station in order to compensate for the decrease, and the V polarization transmission device 1 is used using a radio line. Are transmitted to the output control unit 15 and the control determination unit 16 via the demodulation unit 13.

  The level detection unit 45 of the H polarization receiving device 4 detects the reception levels of the reception unit 41 and the reception unit 31, respectively, and any one of the reception unit 41, the reception unit 31, and the reception level is lower than a predetermined level. Is lower, output level information is output to the modulation unit 44 so as to increase the output level of the transmission units 22 and 12 of the opposite station in order to compensate for the decrease, and the radio wave transmission device 2 for H polarization is used. Are transmitted to the output control unit 25 and the control determination unit 26 via the demodulator 23.

  The output control unit 15 of the V polarization transmission device 1 receives the output level information transmitted from the level detection unit 35 of the opposite station as an active system as a basic form, and calculates the output control value from the received output level information. Then, by simultaneously outputting output control values to the transmission units 12 and 22, the output levels of the V polarization transmission device 1 and the H polarization transmission device 2 are simultaneously controlled.

  The output control unit 25 of the H polarization transmission device 2 functions as a backup system of the output control unit 15 of the V polarization transmission device 1, but receives the output level information transmitted from the level detection unit 45 of the opposite station. Then, by calculating the output control value from the received output level information and outputting the output control value to the transmitters 22 and 12 at the same time, the output levels of the H polarization transmitter 2 and the V polarization transmitter 1 are output. It has a function to control simultaneously.

  The control determination unit 26 of the H polarization transmitting device 2 periodically monitors whether the output level information transmitted from the H polarization receiving device 4 of the opposite station is normally received, and receives it normally. The communication status flag 51 indicating whether or not there is transmitted to the control determination unit 16 of the V polarization transmitting device 1.

  The control determination unit 16 of the V polarization transmitting device 1 periodically monitors whether the output level information transmitted from the V polarization receiving device 3 of the opposite station is normally received. And switching between the active system and the standby system based on the information of the communication status flag 51 transmitted from the H polarization transmitting device 2.

That is, the state in which the V polarization transmission device 1 abnormally receives the output level information based on the monitoring result and the H polarization transmission device 2 normally receives the output level information by the communication state flag 51 is a predetermined time. If it continues, the output control unit 15 is set as a standby system, and the output control unit 25 is set as an active system. The control determination unit 16 sends an instruction to the control determination unit 26 by transmitting a control signal 52 to the control determination unit 26. Thereafter, the output control unit 25 outputs the output control values to the transmission units 22 and 12 at the same time instead of the output control unit 15, so that the outputs of the H polarization transmission device 2 and the V polarization transmission device 1 are output. Control the level at the same time.
[Description of operation]
Next, the operation of the wireless communication system configured as described above will be described in detail with reference to the selection determination table of the output control unit shown in FIG. In FIG. 1, a transmission device for V polarization 1 modulates an input signal by a modulation unit 11 and amplifies a signal output from the modulation unit 11 by a transmission unit 12. In addition, the H polarization transmission device 2 modulates the input signal by the modulation unit 21 and amplifies the signal output from the modulation unit 21 by the transmission unit 22.

  The output signals of the transmission unit 12 and the transmission unit 22 are combined and transmitted from the transmission antenna. This transmission signal is received by the receiving antenna of the opposite station, separated into V polarization and H polarization, amplified by the reception units 31 and 41, demodulated by the demodulation units 32 and 42, and output from the output terminal. Each is output.

  The level detection unit 35 of the V polarization receiving device 3 detects the reception levels of the reception unit 31 and the reception unit 41, and either one of the reception levels of the reception unit 31 and the reception unit 41 is lower than a predetermined level. If it is low, output level information is output to the modulation unit 34 so as to increase the output level of the transmission units 12 and 22 of the opposite station in order to compensate for the decrease, and the V polarization transmission device 1 uses a radio line. The data is transmitted to the output control unit 15 via the demodulation unit 13. Further, the level detection unit 45 of the H polarization receiving device 4 performs the same processing as the level detection unit 35 of the V polarization receiving device 3, outputs the output level information to the modulation unit 44, and uses a radio line. Then, the signal is transmitted to the output control unit 25 via the demodulator 23 of the H polarization transmitting device 2.

  Now, it is assumed that the communication state with the opposite station is normal for both the V polarization and the H polarization (state A in FIG. 2). When receiving the output level information transmitted from the opposite level detector 35, the output controller 15 serving as the active system calculates an output control value from the received output level information and outputs it to the transmitters 12 and 22 simultaneously. Output control value. As a result, the transmission output levels of the transmitters 12 and 22 are controlled according to the input output control value, and the output levels of the V polarization transmitter 1 and the H polarization transmitter 2 are simultaneously controlled. The control by the output control unit 15 does not change even when the communication state with the opposite station is normal in the V polarization, but the H polarization becomes abnormal (state B in FIG. 2).

  The output control unit 25 of the H polarization transmitting device 2 is a standby system of the output control unit 15 of the V polarization transmission device 1, and outputs the output level information transmitted from the H polarization receiving device 4 of the opposite station. Monitoring is performed normally, and a communication status flag 51 indicating whether the signal is normally received is transmitted to the control determination unit 16 of the V polarization transmission device 1. The communication status flag 51 may be “1” for normal reception and “0” for abnormal reception.

  Similarly, the output control unit 15 of the V polarization transmission device 1 monitors whether the output level information transmitted from the V polarization reception device 3 of the opposite station is normally received. The output level information transmitted from the V polarization receiving device 3 is abnormally received and the output level information transmitted from the H polarization receiving device 4 by the communication state flag 51 transmitted from the polarization transmitting device 2. Is in the normal reception state for a certain period of time (state C in FIG. 2), the output control unit 15 of the V polarization transmission device 1 is set as a standby system, and the H signal is The output control unit 25 of the wave transmitter 2 is switched to the active system. As a result, the output control value is calculated by the output control unit 25 of the transmission device 2 for H polarization, and the output control value is simultaneously output to the transmission units 12 and 22.

  By switching the output control unit according to the communication state with the opposite station in this way, it is possible to prevent deterioration of the line quality on the H polarization side when the communication state is poor only on the V polarization side.

  Further, when output control is performed by the output control unit 25 of the standby H polarization device 2, the output level information transmitted from the V polarization reception device 3 is normally received for a certain period of time. If the above continues, regardless of the communication state on the H polarization side (state A and state B in FIG. 2), the output control unit 25 of the H polarization transmission device 2 controls the output control of the V polarization transmission device 1. The output control value is calculated by the output control unit 15 of the transmission device 1 for V polarization, and the output control value is simultaneously output to the transmission units 12 and 22.

  Further, when the output level information transmitted from the V polarization receiving device 3 is abnormally received and the output level information transmitted from the H polarization receiving device 4 is abnormal reception (state D in FIG. 2), the current state is maintained. The output control unit is not switched.

As described above, the output level information transmitted from the V polarization receiver 3 is abnormally received and transmitted from the H polarization receiver 4 using the output controller 15 of the V polarization transmitter 1 as the active system. Only when the state in which the output level information is normally received continues for a certain time or longer, the output control unit is switched to prevent unnecessary switching.
[Other embodiments]
Next, when the H polarization transmission device 2 performs output control by the output control unit 25 as an active system, the outputs of the output control unit 15 of the V polarization transmission device 1 and the H polarization transmission device 2 are output. When the communication state between the control units 25 is monitored and the communication state flag cannot be normally received, the output control unit 15 of the V polarization transmission device 1 is set as the active system and the control signal 52 is used to generate the H polarization. By instructing the output control unit 25 of the transmitter for transmission 2 to be a standby system, the operating system is switched back to the output controller 15 of the transmitter for V-polarization 1, and the output control of the transmitter for V-polarization 1 is controlled. The unit 15 calculates the output control value and outputs the output control value to the transmission units 12 and 22 at the same time.

  As described above, when the communication state cannot be monitored between the transmitting apparatuses, a means for returning to the basic form is provided so that the operation on the spare side is not continued. As a result, the operational system as the basic form can be improved in communication quality by being configured with higher quality components.

  Here, as a basic form, the output control unit 15 of the V-polarized wave transmission device 1 is the active system, but the output control unit 25 of the H-polarization wave transmission device 2 is the operational system, and the V-polarized wave transmission device 1 is used. The output control unit 15 may be a standby system. Further, the monitoring time of the communication state may be arbitrarily set by the user.

  Further, the V-polarized wave transmission device 1 and the H-polarized wave transmission device 2 may function equally with respect to output control without defining a basic form. In this case, the output directions of the communication status flag 51 and the control signal 52 are not fixed as shown in FIG. 1, and the former is from the standby system to the active system, and the latter is from the active system to the standby system. That is, when the H polarization transmitting device 2 is switched to the active system, the communication status flag 51 is output from the control determination unit 16 to the control determination unit 26, and the control signal 52 is output from the control determination unit 26 to the control determination unit 16. Is done.

The block diagram which shows one Example of the radio | wireless communications system of this invention The figure which shows the selection decision table of the output control part of FIG. A block diagram showing an example of a conventional wireless communication system

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Transmitter for V polarization 2 Transmitter for H polarization 3 Receiver for V polarization 4 Receiver for H polarization 11, 21, 34, 44 Modulator 12, 22, 33, 43 Transmitter 13, 23, 32, 42 Demodulator 14, 24, 31, 41 Receiver 15, 25 Output controller 16, 26 Control determination unit 35, 45 Level detector

Claims (5)

In a wireless communication system that configures a two-route microwave communication line using orthogonal vertical polarization and horizontal polarization,
Corresponding to the two routes of the reception side wireless communication device, the reception level of the two routes is detected, and when either one of the two reception levels is lower than a predetermined level, the transmission side wireless communication device of the route Provided with a level detection unit for transmitting output level information,
The output level information transmitted from the level detection unit is received in correspondence with the two routes of the transmission side wireless communication apparatus, the output control value is calculated from the received output level information, and is simultaneously output to the transmission unit of the two routes An output control unit that simultaneously controls each output level so as to compensate for the decrease by outputting a control value, and the control unit that controls one of the output control units to be switched between the active system and the other as the standby system. A wireless communication system comprising a route-dependent control determination unit. The control determination unit of the standby system periodically monitors whether the output level information transmitted from the level detection unit is normally received, and displays a communication status flag indicating whether it is normally received or not To the control judgment unit of
The control judgment unit of the active system periodically monitors whether the output level information transmitted from the level detection unit is normally received, and based on the monitoring result and the information of the communication status flag, 2. The wireless communication system according to claim 1, wherein the standby system is switched. As the basic mode, the standby control determination unit periodically monitors whether the output level information transmitted from the level detection unit is normally received, and indicates a communication state indicating whether the output level information is normally received. The flag is sent to the active control judgment unit as a basic form,
The control judgment unit of the active system periodically monitors whether the output level information transmitted from the level detection unit is normally received, and based on the monitoring result and the information of the communication status flag, 2. The wireless communication system according to claim 1, wherein the standby system is switched.   4. The wireless communication according to claim 2, wherein the switching between the active system and the standby system is performed when a state of abnormal reception in the active system and normal reception in the standby system continues for a predetermined time or more. system. As the basic mode, when the standby output control unit functions as the active system, as the basic mode, when the active control determination unit cannot normally receive the communication status flag, the basic mode is set as the standby mode. Switch the output control unit of the system back to the standby system,
5. The wireless communication system according to claim 3, wherein, as the basic form, an output control unit on the operation side functions as an operation system.

Images