JP2000165340A - Control method for transmission strength and information transmitter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the control method for transmission strength by which interference caused among adjacent waves can be suppressed on the occurrence of a defect of a device or a fault in a transmission channel due to fading or the like and to provide an information transmitter. SOLUTION: The method controls transmission strength of a 1st signal wave with a linearly polarized wave front in a prescribed direction and transmission strength of a 2nd signal wave with a polarized plane orthogonal to that of the 1st signal wave, and controls a 1st transmission means 1v that transmits the 1st signal wave and a 2nd transmission means 1h that transmits the 2nd signal wave on the basis of information as to the signal strength of the 1st signal wave received from a 1st reception means 5v receiving the 1st signal wave, information as to a signal strength difference from an adjacent frequency to the 1st signal wave, information as to the signal strength of the 2nd signal wave received from a 2nd reception means 5h receiving the 2nd signal wave, and information as to a signal strength difference from an adjacent frequency to the 2nd signal wave.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling the transmission intensity of a signal wave for transmitting information between predetermined points by co-channel transmission and the like, and an information transmission apparatus therefor.

[0002]

2. Description of the Related Art Conventionally, transmission power control in co-channel transmission for transmitting signals of different polarizations at the same frequency has been performed for the purpose of preventing deterioration of line quality at the time of fading and signal deterioration due to interference between different polarizations. It has been implemented.

For example, Japanese Patent Application Laid-Open No. H5-153083 discloses a method of simultaneously controlling the transmission power of a transmitter for both vertical and horizontal polarization signals during co-channel transmission. FIG. 3 is a block diagram showing an example of transmission power control in such conventional co-channel transmission. FIG. 3 shows a configuration in which the opposite receiving station 121 receives both vertically (horizontal) polarized radio signals transmitted by the transmitting station 120.

[0004] In transmitting station 120 shown in FIG. 3, signals amplified by each of vertical polarization side transmitter 101 v and horizontal polarization side transmitter 101 h having a transmission power variable function are vertically transmitted by transmission antenna 103. It is transmitted as a horizontally bi-polarized radio signal.

[0005] This signal is received by a receiving antenna 104 provided at the opposite receiving station 121. The received signal is supplied to each of the receiver 105v on the vertical polarization side and the receiver 105h on the horizontal polarization side.

[0006] The receivers 105v and 105h are each provided with a reception level detector 1 for detecting a reception level of each polarization.
06 and a reception level difference detector 107 for detecting a difference in reception level between the adjacent frequency signal and the self-polarized signal.

[0007] The reception level information detected by the reception level detector 106 of each of the receivers 105v and 105h and the reception level difference information detected by the reception level difference detector 107 correspond to a transmission output control panel on the reception side. 1
12 is supplied.

[0008] The transmission output control panel 112 outputs control information for controlling the transmitters 101v and 101h based on these pieces of information. This control information is supplied to the transmission output control panel 111 of the transmitting station 120 which is opposed via a wireless transmission path (illustration and detailed description are omitted). Thus, the transmission output control panel 111 controls the transmission output of the transmitters 101v and 101h based on the input control information.

[0009]

However, when the transmitter 101v or 101h fails, the reception level of the receiver 105v or 105h corresponding to the failed polarization side decreases. The transmission output control panel 112 outputs control information for increasing the transmission output based on the reception level information of the failed polarization side receiver, and
01h is controlled based on this information.

[0010] When the transmission output increases due to the failure of the device, interference with adjacent waves may occur, and the line quality of the adjacent waves may be degraded. If the transmission output of the adjacent wave is controlled in the same manner as described above, the transmission output of the adjacent wave increases, and interference also increases.

The present invention has been made in view of such a background, and is capable of suppressing interference between adjacent waves when a failure occurs in a transmission line due to equipment failure or fading. It is an object of the present invention to provide a strength control method and an information transmission device.

[0012]

In order to solve the above-mentioned problems, according to the first aspect of the present invention, the transmission intensity of a first signal wave having a linear polarization plane in a predetermined direction and the transmission intensity of the first signal wave are determined.
And a transmission intensity control method for controlling the transmission intensity of a second signal wave having a polarization plane orthogonal to that of the first signal wave. The first signal wave is supplied from a first receiving unit that receives the first signal wave. Information on the signal strength of the first signal wave, information on the signal strength difference between adjacent frequencies of the first signal wave, and the second signal wave;
The first signal wave based on the information on the signal strength of the second signal wave and the information on the signal strength difference between the second signal wave and an adjacent frequency supplied from the second receiving means for receiving the first signal wave. And a second transmitting means for transmitting the second signal wave. Further, in the invention according to claim 2, in the transmission intensity control method according to claim 1, the intensity of the first signal wave transmitted from the first transmission unit and the second transmission The intensity of the second signal wave transmitted from the means is increased or decreased at the same rate. Claim 3
In the transmission strength control method according to any one of the first and second aspects, one of the first transmission means and the second transmission means may have a malfunction. The signal strength supplied from the first receiving means or the second receiving means corresponding to either the first transmitting means or the second transmitting means in which the functional abnormality has not occurred. And controlling the intensity of the first signal wave and the intensity of the second signal wave based on the signal intensity difference. Also, in the invention according to claim 4, in the method for controlling the transmission intensity according to any one of claims 1 to 3, the first or second transmission intensity is controlled.
Either one or more of the signal strength values output by the receiving means is below a predetermined reference value or the first or second
The intensity of the first signal wave and the intensity of the second signal wave are increased when at least one of the signal intensity difference values output by the receiving means exceeds a predetermined reference value. . According to a fifth aspect of the present invention, in the transmission intensity control method according to any one of the first to fourth aspects, the signal intensity output by the first and second receiving units is provided. When any of the values exceeds a predetermined reference value and both of the signal strength difference values output by the first and second receiving means are below a predetermined reference value, the intensity of the first signal wave is increased. And the intensity of the second signal wave is reduced. Further, in the invention according to claim 6, a first transmitting means for transmitting a first signal wave having a linear polarization plane in a predetermined direction, and a polarization plane orthogonal to the first signal wave. A second transmitting means for transmitting the second signal wave, a receiving strength detecting means for detecting the signal strength of the signal wave having a desired frequency, and an intensity difference for detecting a signal strength difference between adjacent frequencies of the signal wave. Detecting means corresponding to the first
Or first and second receiving means for receiving a second signal wave, and the signal strength and the signal strength difference supplied from the first receiving means and the signal supplied from the second receiving means. Transmission intensity control means for controlling the intensity of the first signal wave transmitted by the first transmission means and the intensity of the second signal wave transmitted by the second transmission means based on the intensity and the signal intensity difference And characterized in that: Also, in the invention according to claim 7, in the information transmission apparatus according to claim 6, the transmission intensity control unit determines the intensity of the first signal wave transmitted from the first transmission unit. It is characterized in that the intensity of the second signal wave transmitted from the second transmitting means is increased or decreased at the same rate. Further, in the invention according to claim 8, claim 6
Alternatively, in the information transmission device according to any one of claims 7, the first transmission unit and the second transmission unit each include a failure detection unit that outputs an alarm signal that reports a functional abnormality,
The transmission intensity control unit includes the first transmission unit and the second transmission unit.
If any one of the transmitting means emits the alarm signal, the first receiving means or the first receiving means corresponding to any of the first transmitting means or the second transmitting means not emitting the alarm signal The power of the first signal wave and the power of the second signal wave are controlled based on the signal strength supplied from the second receiving means and the signal strength difference. According to the ninth aspect of the present invention, in the information transmission apparatus according to any one of the sixth to eighth aspects, the first and second transmitting means and the first and second A transmitting station provided with a first antenna for simultaneously transmitting signal waves and the transmission intensity control means, a second antenna for simultaneously receiving the first and second signal waves, and the first and second antennas; A receiving station provided with receiving means and transmitting means for transmitting the signal strength information output from the first and second receiving means and the signal strength difference information to the transmitting station. I do. Also, in the invention according to claim 10, in the information transmission apparatus according to any one of claims 6 to 9, the transmission intensity control means may be configured such that the first or second reception means Either one or more of the output signal strength values is lower than a predetermined reference value, or one or more of the signal strength difference values output by the first or second receiving means is higher than a predetermined reference value. Preferably, the intensity of the first signal wave and the intensity of the second signal wave are increased.
Further, according to the invention set forth in claim 11, in the information transmission apparatus according to any one of claims 6 to 10, the transmission intensity control means may be configured such that the first and second reception means When all of the signal strength values to be output exceed a predetermined reference value and both of the signal strength difference values output by the first and second receiving means are below a predetermined reference value, the first And the intensity of the second signal wave is reduced.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below. FIG. 1 is a block diagram showing an overall configuration of an information transmission device according to one embodiment of the present invention. In the configuration shown in FIG. 1, the signals amplified by the transmitter 1 v on the vertical polarization side and the transmitter 1 h on the horizontal polarization side provided in the transmitting station 20 are converted by the transmission antenna 3 into vertical and horizontal dual polarized radio signals. Sent out. The transmitter 1v and the transmitter 1h
Have a variable transmission power function.

The vertically and horizontally polarized signals are transmitted to the opposite receiving station 2.
1 is received by the receiving antenna 4 included therein. The received signal is supplied to the receiver 5v on the vertical polarization side and the receiver 5h on the horizontal polarization side.

The receiver 5v and the receiver 5h are provided with a reception level detector 6 for detecting the reception level of each polarization.
And a reception level difference detector 7 for detecting a reception level difference between the adjacent frequency signal and the self-polarized signal.

The reception level information S _Lv (output by the receiver 5v) and S _Lh (output by the receiver 5h) detected by the reception level detector 6 and the reception level difference information S detected by the reception level difference detector 7 _Dv (output from receiver 5v), S
_Dh (output from the receiver 5h) means the digital converter 8
Supplied to The digital converter 8 converts the supplied analog information into digital data, and outputs a communication packet _{Dp1 including the} digital data.

The communication packet D _p1 output from the digital converter 8 is supplied to the transmission output control panel 2 of the opposing transmission station 20 via a wireless transmission path (not shown). The transmission output control panel 2 receives the reception level information S _Lv , S _Lh and the reception level difference information S _Dv , S _Dh contained in the supplied communication packet D _p1.
, The transmission output of the transmitter 1v and the transmitter 1h is controlled.

In this embodiment, the transmission output control panel 2 receives the reception level information S _Lv , S _Lh and the reception level difference information S _Dv , S _Dh.
The transmission output of each of the transmitters 1v and 1h is controlled based on the above, and the processing is different depending on whether a failure has occurred in the transmitters 1v and 1h or not.

First, if no failure has occurred in the transmitters 1v and 1h, it is determined whether or not the values of the reception level information S _Lv and S _Lh are equal to or less than a reference value arbitrarily set in advance. It is detected whether or not the values of the reception level difference information S _Dv and S _Dh are equal to or more than a reference value arbitrarily set in advance.

Here, when the value of the reception level information becomes equal to or less than a predetermined reference value or the value of the reception level difference information becomes equal to or more than a predetermined reference value in either one of the vertical polarization and the horizontal polarization. , The transmission outputs of the transmitters 1v and 1h are respectively increased by the control signal C _pw . On the other hand, when these conditions do not apply, the transmission output of each of the transmitters 1v and 1h is reduced by the control signal C _pw .

In the case where no equipment failure has occurred as described above, the reception level difference from the adjacent wave is detected, whereby
An increase in the amount of leakage into the own polarization due to an increase in the transmission output of the adjacent wave is detected. As a result, it is possible to detect a case where the line quality is degraded even though the reception level of the self-polarization is not lowered.

In this embodiment, the transmission outputs of both polarizations are simultaneously controlled. Thus, when it becomes necessary to increase the transmission output for one polarization, it is possible to prevent the deterioration of the line due to an increase in the leakage amount for the other polarization.

That is, in this embodiment, the amount of leakage from vertical polarization to horizontal polarization and the amount of leakage from horizontal polarization to vertical polarization are kept constant, and good channel quality can be obtained.

Next, a case where a failure occurs in either the transmitter 1v or the transmitter 1h will be described. For example, when the transmitter 1v on the vertical polarization side fails, the transmission output is significantly reduced by the output mute function of the transmitter 1v regardless of the control signal C _pw output from the transmission output control panel 2. For this reason, the reception level information S output by the receiver 5v
The value of _Lv also drops significantly.

At this time, the transmission output control panel 2
Is output a failure alarm signal S _Fv , and if a failure is detected, the information supplied from the receiver 5v is ignored and the reception level information supplied from the reception level detector 6 of the receiver 5h is ignored. The transmission output of the transmitter 1v is controlled based on S _Lh .

The same applies to the case where the transmitter 1h on the horizontal polarization side fails, and the control signal C _pw output from the transmission output control panel 2 is output.
Irrespective of this, the transmission output is significantly reduced by the output mute function of the transmitter 1h. For this reason, the value of the reception level information S _Lh output by the receiver 5h also drops significantly.

FIG. 2 is a block diagram showing an overall configuration of an information transmission apparatus according to another embodiment of the present invention. In FIG. 2, parts corresponding to the respective parts shown in FIG. 1 are given the same reference numerals, and detailed description thereof will be omitted.

The transmission power control panel 10 provided in the receiving station 21a shown in FIG. 2 generates transmission power control information D _pv based on the reception level information S _Lv and the reception level difference information S _Dv, and _The transmission power control information Dph is generated based on _Lh and the reception level difference information S _Dh . The transmission output control information D _pv and the transmission output control information D _ph are transmitted by a communication packet D _p2 to the transmission output control panel 9 provided in the opposite transmitting station 20a.

The transmission output control panel 9 includes transmission output control information D
_{When the pv} and the transmission output control information _Dph are supplied, the failure alarm signals S _Fv output from the transmitters 1v and 1h, respectively.
Alternatively, the state of occurrence of S _Fh is confirmed, and the control signal C _pw is output based on the transmission output control information on the polarization side where no failure has occurred.

As described above, in the present embodiment, basic control information is generated on the receiving side. That is, the same effect can be obtained without providing all the transmission output control determination units on the transmission side.

As described above, according to the present invention, in co-channel transmission in which signals of different polarizations are transmitted at the same frequency, the reception level of the receiver for both vertical and horizontal polarization signals is detected, and adjacent different levels are detected. The difference between the reception level and the frequency signal is detected, and the transmission outputs of the transmitters of both polarizations are simultaneously controlled based on the detection result.

As a result, it is possible to compensate for a decrease in reception quality due to multipath fading and a deterioration in line quality due to an increase in the amount of leakage from adjacent different frequency signals. It is possible to prevent deterioration of the line quality due to interference with the frequency signal.

[0033]

As described above, according to the present invention, the transmission intensity of the first signal wave having a linear polarization plane in a predetermined direction and the second signal having a polarization plane orthogonal to the first signal wave. For controlling the transmission intensity of the signal wave, the information on the signal intensity of the first signal wave supplied from the first receiving means for receiving the first signal wave, and the adjacent frequency of the first signal wave , The signal strength information of the second signal wave supplied from the second receiving means for receiving the second signal wave, and the signal strength difference between adjacent frequencies of the second signal wave. The first transmitting means for transmitting the first signal wave and the second transmitting means for transmitting the second signal wave are controlled based on this information. Further, the intensity of the first signal wave transmitted from the first transmitting means and the intensity of the second signal wave transmitted from the second transmitting means are increased or decreased at the same rate. Further, when any one of the first transmission means and the second transmission means has a malfunction, a function corresponding to any of the first transmission means or the second transmission means having no malfunction has occurred. The intensity of the first signal wave and the intensity of the second signal are determined based on the signal strength and the signal strength difference supplied from the first receiving means or the second receiving means.
And the intensity of the signal wave. In addition, the first or second
Either one or more of the signal strength values output by the receiving means is lower than a predetermined reference value, or one or more of the signal strength difference values output by the first or second receiving means exceeds a predetermined reference value. In this case, the intensity of the first signal wave and the intensity of the second signal wave are increased. Further, both of the signal strength values output by the first and second receiving means exceed a predetermined reference value, and both of the signal strength difference values output by the first and second receiving means are equal to the predetermined reference value. In the case where the transmission frequency is less than the above, the intensity of the first signal wave and the intensity of the second signal wave are reduced, so that when a failure occurs in a transmission line due to equipment failure or fading, interference generated between adjacent waves is reduced. An effect is obtained that a transmission intensity control method and an information transmission device that can be suppressed can be realized.

That is, according to the present invention, the reception level information reduced by the failure of the transmitter is ignored, and the transmission output is controlled based on the reception level on the normal polarization side, so that unnecessary transmission output is not increased. Therefore, it is possible to reduce interference with an adjacent wave when a transmitter device fails.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an overall configuration of an information transmission device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing an overall configuration of an information transmission device according to another embodiment of the present invention.

FIG. 3 is a block diagram showing an example of transmission power control in conventional co-channel transmission.

[Description of Signs] 1h Transmitter (second transmitting means) 1v Transmitter (first transmitting means) 2 Transmission output control panel 3 Transmitting antenna (first antenna) 4 Receiving antenna (second antenna) 5h Reception (Second receiving means) 5v receiver (first receiving means) 6 reception level detector (reception intensity detection means) 7 reception level difference detector (intensity difference detection means) 8 digital converter (transmission means) 9 Transmission output control panel 10 Transmission output control panel 20, 20a Transmission station 21, 21a Receiving station 101h, 101v Transmitter 111 Transmission output control panel 103 Transmission antenna 104 Receiving antenna 105h, 105v Receiver 106 Reception level detector 107 Reception level difference detection vessel 112 transmission output control board 120 transmits station 121 receiving station C _pw control signal D _p1, D _p2 communication packet D _pv, D _ph transmission output system Information S _Dh, S _Dv reception level difference information (signal intensity difference) S _Fh, S _Fv fault alarm signal (alarm signal) S _Lh, S _Lh reception level information (signal strength)

Claims (11)

[Claims] 1. A transmission intensity for controlling a transmission intensity of a first signal wave having a linear polarization plane in a predetermined direction and a transmission intensity of a second signal wave having a polarization plane orthogonal to the first signal wave. The control method of (1), wherein information on the signal strength (S _Lv ) of the first signal wave supplied from the first receiving means (5v) for receiving the first signal wave and the first signal wave Of the signal strength difference (S _Dv ) from the adjacent frequency of the second signal wave, and the signal strength (S _Lh ) of the second signal wave supplied from the second receiving means (5h) for receiving the second signal wave Transmitting means (1v) for transmitting the first signal wave based on the information of the second signal wave and the information of the signal strength difference (S _Dh ) between the second signal wave and the adjacent frequency, and the second signal A transmission intensity control method, comprising: controlling a second transmission means (1h) for transmitting a wave. 2. A method according to claim 1, wherein said first transmitting means transmits said first transmitting means.
2. The transmission intensity control method according to claim 1, wherein the intensity of the signal wave and the intensity of the second signal wave transmitted from the second transmission means are increased or decreased at the same rate. 3. When one of the first transmitting means and the second transmitting means has a functional abnormality, the first transmitting means or the second transmitting means not having the functional abnormality. The intensity of the first signal wave and the intensity of the second signal wave based on the signal intensity and the signal intensity difference supplied from the first receiving means or the second receiving means corresponding to 3. The method for controlling transmission intensity according to claim 1, wherein the transmission intensity is controlled. 4. The signal strength output by the first or second receiving means when one or more of the signal strength values is lower than a predetermined reference value or the signal strength output by the first or second receiving means. 4. The method according to claim 1, wherein when one or more of the difference values exceeds a predetermined reference value, the intensity of the first signal wave and the intensity of the second signal wave are increased. A transmission strength control method according to any one of the above. 5. A method according to claim 1, wherein each of said signal strength values output by said first and second receiving means exceeds a predetermined reference value and said signal strength difference value output by said first and second receiving means is provided. The method according to any one of claims 1 to 4, wherein when any one of them is lower than a predetermined reference value, the intensity of the first signal wave and the intensity of the second signal wave are reduced. Transmission intensity control method. 6. A first transmitting means for transmitting a first signal wave having a linear polarization plane in a predetermined direction, and transmitting a second signal wave having a polarization plane orthogonal to the first signal wave. A second transmitting unit, a receiving intensity detecting unit (6) for detecting a signal intensity of a signal wave of a desired frequency, and an intensity difference detecting unit (7) for detecting a signal intensity difference between adjacent frequencies of the signal wave. First and second receiving the corresponding first or second signal wave
Receiving means, and the first transmission based on the signal strength and the signal strength difference supplied from the first receiving means and the signal strength and the signal strength difference supplied from the second receiving means. An information transmission apparatus comprising: transmission intensity control means for controlling the intensity of the first signal wave transmitted by the means and the intensity of the second signal wave transmitted by the second transmission means. 7. The transmission intensity control unit, wherein the intensity of the first signal wave transmitted from the first transmission unit is equal to the intensity of the second signal wave transmitted from the second transmission unit. 7. The information transmission apparatus according to claim 6, wherein the information transmission is increased or decreased. 8. The first transmission means and the second transmission means each include a failure detection means for outputting an alarm signal (S _Fv , S _Fh ) for notifying a function abnormality, and the transmission intensity control means comprises: The first transmitting means and the second transmitting means;
If any one of the transmitting means emits the alarm signal, the first receiving means or the first receiving means corresponding to any of the first transmitting means or the second transmitting means not emitting the alarm signal 7. The method according to claim 6, further comprising controlling the first signal wave intensity and the second signal wave intensity based on the signal intensity and the signal intensity difference supplied from the second receiving unit. Alternatively, the information transmission device according to claim 7. 9. A transmitting station (20) provided with said first and second transmitting means, a first antenna (3) for simultaneously transmitting said first and second signal waves, and said transmission intensity controlling means. ), A second antenna (4) for simultaneously receiving the first and second signal waves, the first and second receiving means, and the signal strengths output by the first and second receiving means. 9. A receiving station (21) provided with transmission means (8) for transmitting information and information on the signal strength difference to the transmitting station. Information transmission device according to the above. 10. The transmission strength control means, wherein one or more of the signal strength values output by the first or second reception means is lower than a predetermined reference value or the first or second reception The intensity of the first signal wave and the intensity of the second signal wave are increased when at least one of the signal intensity difference values output by the means exceeds a predetermined reference value. The information transmission device according to any one of claims 6 to 9. 11. The transmission strength control means, wherein both of the signal strength values output by the first and second reception means exceed a predetermined reference value and the first and second reception means output 11. The method according to claim 6, wherein when any one of the signal strength difference values falls below a predetermined reference value, the strength of the first signal wave and the strength of the second signal wave are reduced. 12. The information transmission device according to any one of the above.