JP2002057598A - Device and method for adjusting gain of radio communication device and method for controlling transmission level of subscriber station in radio communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gain adjustment method which can reduce the level change range of countermeasure enable transmission/reception signals about a radio communication device that comprises at least two units. SOLUTION: When the gain of a radio communication device comprising a 1st unit 40 connected to an antenna 30 and a 2nd unit 60 connected to the unit 40 via a connection line 50 is adjusted, a 1st adjuster 80 is connected between the unit 60 and the line 50, a 2nd adjuster 70 is connected between the unit 40 and the line 50 respectively. The adjuster 80 detects the level of a receiving or transmitting signal and compares it with a prescribed level. In response to this comparison result, the adjuster 70 outputs a gain adjustment control signal to the unit 40 to adjust the gain of the radio communication device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gain adjusting method for a radio communication apparatus which is divided into at least two units and which is connected by a cable such as a coaxial cable.

[0002]

2. Description of the Related Art Recently, studies have been made on a subscriber wireless system for wirelessly connecting an existing transmission network and a subscriber. In such a subscriber wireless system, in order to efficiently accommodate a large number of subscriber stations and perform communication, a plurality of base stations are installed so as to take a zone configuration, and a plurality of subscriber stations are provided by one base station. So-called point-to-multipoint (hereinafter referred to as PTMP) that accommodates communication of remote stations
The development of a communication network with a configuration is under consideration.

[0003] In a subscriber station of this type of system, it is necessary to install an antenna outdoors such as the roof of a building in order to obtain a view from the base station, while it is desired to install a part for performing various operations indoors. Due to the demand, a configuration divided into two units is often adopted.

In this case, a part for converting a radio frequency signal transmitted and received by the antenna into an intermediate frequency signal (IF signal) is installed outdoors together with the antenna as an outdoor unit (hereinafter referred to as ODU), and the IF signal is transmitted. The part that performs demodulation and performs various operations is an indoor unit (hereinafter, referred to as IDU).
As indoors. And ODU
And the IDU are connected via a coaxial cable or the like.

[0005] In such a PTMP system, a base station transmits and receives signals to and from a large number of subscriber stations within its own area. For this reason, if the received signal level of the base station is significantly different for each subscriber station, the received signal of the subscriber station with the higher received level interferes with the received signal of the subscriber station with the lower received level. However, there is a problem in the system configuration.

Therefore, in such a PTMP system,
It is necessary to control the transmission level for each subscriber station so that the received signal from each subscriber station on the base station side becomes substantially the same level. However, since each subscriber station has a different distance from the base station, it is not sufficient to keep the transmission level of each subscriber station constant. For this reason, in such a wireless system, the base station usually transmits a control signal for instructing each subscriber station to increase (or decrease) the transmission level, and based on this control signal, Therefore, each subscriber station controls the transmission level (hereinafter, such transmission level control is performed by TPC (Tr
control power control). ).

Here, since the control signal for performing the TPC control is superimposed on the transmission signal from the base station and transmitted, in order to recognize the content of the control signal, the control signal is drawn into the IDU and then transmitted. Only after demodulating the signal can it be extracted. For this reason, the transmission level control based on the TPC control is performed by controlling the level of the IF signal output from the IDU.

[0008]

However, considering the setting of the reception level, the level of the IF signal input to the IDU of the subscriber station fluctuates due to the following fluctuating factors for each installed station. become. (1) Propagation loss caused by a difference in propagation distance from a base station (2) Cable loss caused by a difference in length of a coaxial cable connecting an ODU and an IDU (3) Rain attenuation

When these are summed up, a variation of 60 dB or more can be considered depending on the system, but it is necessary to increase the input dynamic range of the IDU so as to cope with these variations. For this reason, the conventional PT
In the subscriber station of the MP system, if an indoor unit (IDU) is configured to have such a large input dynamic range, the size and cost of the device will be increased, and it is not practical in terms of circuit configuration. There was a problem. An object of the present application is to provide a wireless communication device capable of performing communication without increasing a dynamic range of an indoor unit (IDU) in order to solve such a problem.

[0010]

The present invention comprises an antenna,
A first unit connected to the antenna,
A gain adjuster for a wireless communication device that adjusts the gain of a transmission signal and a reception signal of a wireless communication device that includes a second unit that is connected to a unit via a connection line; A reception level detection unit connected between a connection line and detecting a level of the reception signal transmitted through the antenna and the first unit; and a level of the transmission signal transmitted from the second unit. And a signal level detected by the reception level detection means or the transmission level detection means is compared with a preset predetermined value, and according to the result, the first unit A first adjuster that multiplexes a gain adjustment control signal for controlling a transmission level or a reception level with the transmission signal and outputs the multiplexed signal, and is connected to the first unit And separates the gain adjustment control signal from the transmission signal transmitted from the second adjuster, and controls the first unit based on the gain adjustment control signal based on the gain adjustment control signal. With the configuration including the second adjuster that outputs a signal, the gain of the wireless communication device is adjusted.

That is, by adopting such a configuration,
According to the present invention, at the time of installation of the wireless communication device, the first unit connected to the antenna side is controlled based on the level of the transmission signal or the reception signal detected by the first adjuster connected to the second unit side. By adjusting the gain in advance, it is not necessary to increase the input / output dynamic range of the second unit so much.

[0012]

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows a point-to-multipoint (PTMP) to which the present invention is applied.
FIG. 1 is a diagram for explaining an overall configuration of a system. In FIG. 1, an antenna 11 is provided in a base station 10 connected to an existing public network by a wired line or a wireless line, and the inside of a zone 1 within a range where communication is possible via the base station 10 is provided. , A plurality of subscriber stations 20 are installed. As shown in FIG. 1, each subscriber station 20 has a different distance from the base station 10 depending on the installation location.

FIG. 2 is a diagram showing the overall configuration of each subscriber station. The subscriber station includes an antenna 30, an outdoor device (hereinafter referred to as ODU) 40 connected to the antenna 30 as a first unit and installed outdoors, a coaxial cable 50 as a connection line, and an indoor unit installed as a second unit. And an indoor unit (hereinafter, referred to as IDU) 60. In the following description, for convenience, the antenna 30 → OD
U40 → coaxial cable 50 → signal in the direction of IDU60 is set as a reception signal, and conversely, IDU60 → coaxial cable 50 →
A signal in the direction from the ODU 40 to the antenna 30 will be described as a transmission signal.

The antenna 30 is installed after performing direction adjustment in order to transmit and receive radio signals to and from the base station 10. The ODU 40 connected to the antenna 30 converts a radio frequency signal transmitted / received by the antenna 30 into an IF signal which is an intermediate frequency signal, and is usually integrally formed with the antenna 30 in many cases. The antenna 30 and the ODU 40 are set up on a pole, for example, on the roof of a building, and fastened to the pole for installation.

The ODU 40 has a coaxial cable 50.
Is connected to the IDU 60 installed indoors via the coaxial cable 50. This coaxial cable 50
The transmission signals in the intermediate frequency band transmitted from the IDU 60 to the ODU 40 (hereinafter referred to as transmission IF signals) and the reception signals in the intermediate frequency band transmitted from the ODU 40 to the IDU 60 (hereinafter referred to as reception IF signals). .), Various control signals, and IDU60 to ODU40.
Are supplied in a multiplexed manner and transmitted. In addition, terminal devices such as telephones and PCs are connected to the IDU 60 via a network such as a LAN, so that communication with an existing network can be performed. Here, IDU60
The connection between the terminal and the terminal device may be such that it is directly connected without going through a LAN or the like.

The general configuration of the ODU 40 includes a transmission system, a reception system, and a control unit 41 for controlling the entire ODU. The connection end to the antenna 30 is branched and connected to the reception filter 421 and the transmission filter 434. Here, the reception filter 421 has a characteristic of passing a radio frequency band signal for a reception signal and blocking a signal in a radio frequency band for a transmission signal. Conversely, the transmission filter 434 has a characteristic of passing a radio frequency band signal for a transmission signal and blocking a signal in a radio frequency band for a reception signal.

The reception system through which the reception signal passes includes a reception filter 421, a reception amplifier 422, and a frequency conversion section 42.
3. Variable attenuator for reception (hereinafter referred to as ATT for reception)
It is connected to the ODU demultiplexer 44 via 424. On the other hand, the transmission system through which the transmission signal passes is transmitted from the ODU demultiplexing unit 44 to the transmission variable attenuator (hereinafter, transmission A
It is called TT. 431, a frequency conversion unit 432, and a transmission amplifier 433, and are connected to the transmission filter 434. Then, the ODU demultiplexer 44 outputs the IDU 60
And a terminal for connecting a coaxial cable 50 for connection with the terminal.

Further, the ODU demultiplexer 44 has a DC /
A DC converter 45 is connected, converts the power supply voltage supplied from the IDU 60 into a desired voltage, and
0 is supplied to each part. Further, the ODU 40 is provided with a control signal terminal 46, and is connected to the control unit 41.

Next, the configuration of the IDU 60 will be described.
The IDU 60 has, at a terminal connected to the coaxial cable 50, a transmission IF transmitted from the IDU 60 to the ODU 40.
Signal and the reception I transmitted from the ODU 40 to the IDU 60.
IDU demultiplexer 61 for separating the F signal from the power supply voltage
Is connected.

The receiving system includes an IDU demultiplexing unit 61
To a terminal I / F unit 63 via a receiver 621, an A / D converter 622, and a demodulation / error correction decoding unit 623. On the other hand, the transmitting system supplies the modulation / modulation to the terminal I / F 63.
It is connected to the IDU demultiplexer 61 via an error correction encoder 641, a frequency converter 642, and a variable attenuator 643. The control unit 65 controls the entire IDU 60. The IDU 60 has an external power supply terminal 71 to which an external power supply is connected. An AC / DC converter 72 is connected to the external power supply terminal 71.
The power supply voltage converted to DC by the C / DC converter 72 is ID
The power is supplied to each unit in the U60, and is also supplied to the ODU 40 via the IDU demultiplexing unit 61.

Next, the operation will be described. Base station 10
The received signal in the radio frequency band received from the receiver is input to the receiving amplifier 422 via the receiving filter 421.
The signal is amplified to a predetermined level by the receiving amplifier 422.
After that, the reception signal of the radio frequency band is
3, the local oscillator 461 to the hybrid circuit 46
2 is mixed with the local oscillation signal output through the ATT 2 to be frequency-converted into an IF signal for reception.
424. Here, the ATT for reception 424 is
The signal is attenuated to a level based on the control from the control unit 41. By adjusting this level, the reception gain of the ODU can be adjusted. The reception IF signal attenuated to a desired level by the reception ATT 424 is input to the ODU demultiplexing unit 44.

Here, the frequency of the reception IF signal is
The frequency and band of the F signal are different. For this reason, even if it is multiplexed with the transmission IF signal, it can be separated later. The power supply voltage transmitted from the IDU 60 is
Because it is a DC voltage, it can be separated.

The received IF signal transmitted to the IDU 60 via the coaxial cable 50 is separated by the IDU multiplexing / demultiplexing unit 61 and input to the receiving unit 621. After being converted into a digital signal by the A / D converter 622, demodulation and error correction decoding are performed by the demodulation / error correction decoding unit 623. In demodulation / error correction decoding section 623, a TPC control signal for controlling the transmission level from base station 10 is extracted, and this TPC control signal is output to control section 65. The demodulated received signal is transmitted via the terminal I / F 63 to
It is output to a terminal or the like connected to the IDU 60.

On the other hand, the transmission signal input from the terminal or the like to the IDU 60 is subjected to error correction coding such as Reed-Solomon coding in the modulation / error correction coding section 641 and modulated. Then, the frequency is converted into a transmission IF signal by the frequency conversion unit 642. Here, the transmission IF signal has a different frequency band from the reception IF signal, as described above. The variable attenuator 643 performs TP for controlling the transmission level transmitted from the base station 10.
Level control based on the C control signal and the IDU
The signal is input to the demultiplexing unit 61. Here, the signal is multiplexed with a power supply voltage or the like and input to the coaxial cable 50.

The transmission IF signal transmitted to the ODU 40 via the coaxial cable 50 is separated from the power supply voltage or the like by the ODU multiplexing / demultiplexing unit 44 and input to the transmission ATT 431.
Here, the transmission ATT 431 is attenuated to a level based on the control from the control unit 41, and by adjusting this level, the transmission gain of the ODU can be adjusted. The transmission IF signal attenuated to a desired level by the transmission ATT 431 is input to the frequency conversion unit 432. Then, the transmission IF signal is frequency-converted into a radio frequency band signal by mixing with a local oscillation signal output from the local oscillator 461 via the hybrid circuit 462 by the frequency conversion unit 432, and predetermined by the transmission amplifier 433. After being amplified to a voltage, the signal is output from the antenna 30 to the base station 10 via the transmission filter 434.

A method of adjusting the transmission gain and the reception gain of the ODU 40 for the subscriber station of the PTMP system as described above will be described. As described in connection with the prior art, the level of the received IF signal input to the IDU 60 of the subscriber station fluctuates due to the following fluctuating factors for each installed station. (1) Propagation loss caused by difference in propagation distance between base station 10 and subscriber station 20S (2) Cable loss caused by difference in length of coaxial cable 50 connecting ODU 60 and IDU 40 (3) Rainfall attenuation These fluctuations Among the factors, (1) and (2) are determined at the time of installation of the subscriber station, and do not change thereafter. For this reason, according to the present invention, for the variable elements (1) and (2), the level at which the level of the IDU can be adjusted is adjusted by adjusting the level at the ODU when the subscriber station is installed.
(3) Rainfall attenuation + its margin is sufficient.

FIG. 3 shows an OD when a PTMP subscriber station is installed.
FIG. 3 is a diagram illustrating a configuration of an adjuster for performing gain adjustment of U. As shown in FIG. 3, the level adjuster is an ODU-side adjuster 70 connected between the ODU 40 and the coaxial cable 50.
Connected between the IDU 60 and the coaxial cable 50
It comprises a DU-side adjuster 80. Each of these adjusters is connected at the time of installation of the subscriber station. After the adjustment at the time of installation is completed, the adjusters are removed and returned to the configuration shown in FIG. 2 for operation.

First, the ODU-side regulator 70 transmits a transmission IF signal transmitted through the coaxial cable 50 transmitted from the IDU-side regulator 80, a power supply voltage, and a reception IF output to the IDU-side regulator 80. An ODU demultiplexer 71 for separating a control signal transmitted from the IDU-side regulator from a multiplexed signal (hereinafter, referred to as a main signal etc.) multiplexed, and a modem 72 for modulating and demodulating the control signal. ,
It comprises a CPU 73 that outputs a level control signal to the ODU 40 based on the received control signal, and an operation / display unit 74.

Here, as shown in FIG. 4, the operation / display section 74 is a reception level display section 741 for displaying the reception level detected by the IDU-side adjuster 80 (for example, the reception level is displayed by a bar graph display or the like). ), A direction adjustment start button 742 to be pressed when starting the antenna direction adjustment, a direction adjustment LED 743 indicating that the antenna direction adjustment is completed,
A reception level control start button 744 that is pressed when the reception signal level adjustment is started, a reception level control LED 745 that indicates that the reception signal level adjustment is completed, and a transmission level control start button 746 that is stamped when the transmission signal level adjustment is started , And a transmission level control LED 747 indicating that the level control of the transmission signal has been completed.

The most preferable procedure for adjusting the gain of the ODU 40 is to perform antenna direction adjustment, reception gain adjustment, and transmission gain adjustment in this order. The adjustment of the direction of the antenna is performed first because it is most important to surely and efficiently transmit and receive the radio signal to and from the base station. The reason for adjusting the reception level before adjusting the transmission level next is
This is to ensure that the TPC control, which is the control of the transmission level of the subscriber station by the base station, is performed at the transmission level control stage.

Therefore, in the operation / display unit 74 of the ODU-side adjuster 70, the operation of the reception level control start button 744 is enabled only when the direction adjustment LED 743 is lit. Also, a transmission level control start button 746
Is the direction adjustment LED 743 and the reception level control LE
The operation is valid only when both D745 are lit. Here, antenna direction adjustment and ODU transmission /
To adjust the reception gain, the operation display unit 74 is provided on the ODU-side adjuster 70 so that the ODU-side adjuster can make adjustment alone. The reason is that the ODU 40 requires an operation such as changing the direction of the antenna 30 to adjust the direction of the antenna 30, whereas the IDU 40
This is because the operation is not necessarily required on the 60 side.

The IDU-side adjuster 80 includes a cable-side demultiplexing unit 81 connected to an input terminal on the coaxial cable side.
And the IDU-side demultiplexing unit 82 connected to the input / output terminal on the IDU side, the receiving I / O transmitted from the ODU side.
The F signal and the transmission IF signal transmitted from the IDU side are separated. The cable-side multiplexing / demultiplexing unit 81 is connected to a receiving hybrid circuit 83 for branching the received IF signal into two. One output is connected to the IDU-side multiplexing / demultiplexing unit 82, and the other output is connected to the receiving IF signal. Is connected to a receiving level detector 84 for detecting the voltage level of the signal. A transmission hybrid circuit 85 for splitting the transmission IF signal into two is connected to the IDU-side demultiplexing unit 82. One output is connected to the cable-side demultiplexing unit 81, and the other output is connected to the transmission IF signal. It is connected to a transmission level detector 86 that detects the voltage level of the signal.

Here, the reception level detector 84 and the transmission level detector 86 detect the absolute value of the voltage level by detecting the input reception / transmission IF signal and performing A / D conversion. . Outputs of the reception level detector 84 and the transmission level detector 86 are connected to the CPU 87. The CPU 87 compares the detected voltage level with a preset specified value, and generates a gain control signal as a height value including information on whether to increase or decrease the gain of the ODU 40. This gain control signal is transmitted to the modem 8
The signal is multiplexed into a main signal and the like by a cable-side multiplexing / demultiplexing unit 81 via the signal line 8.

Next, a method of level adjustment using this level adjuster will be described. First, the antenna 30 and the ODU 40 are installed at a place where the line of sight with the base station 10 can be obtained (for example, on the roof of a building). Further, the IDU 60 is installed at a desired place indoors, and wiring work of the coaxial cable 50 connecting the ODU 60 and the IDU 40 is performed. And
ODU side adjuster 70 between ODU 40 and coaxial cable 50
And the IDU-side adjuster 80 is connected between the IDU 60 and the coaxial cable 50. Further, a maintenance terminal composed of a PC or the like is connected to the external terminal 89 of the IDU-side adjuster 80, and a prescribed value for determining that the antenna direction is correct at the time of adjusting the antenna direction, and a prescribed level of the reception IF signal. value,
Then, the level specified value of the transmission IF signal is set. In addition,
In the present embodiment, the setting of these specified values is performed by an external input by connecting a maintenance terminal. However, a ROM or the like in which each specified value is built is built in the IDU-side adjuster 80 in advance. You may put it.

First, the procedure for adjusting the direction of the antenna will be described. When the coordinator presses the direction adjustment start button 742 of the ODU side adjuster 70, a direction adjustment start signal is input to the demultiplexer 71 of the ODU side adjuster 70 via the modem 72. Here, it is multiplexed with the main signal etc.
0 to the IDU-side regulator 80. In the IDU-side coordinator 80, the direction adjustment start signal is extracted by the cable-side demultiplexer 81, and the extracted signal is sent to the CPU 87 via the modem 88.
Take in. The CPU 87 of the IDU-side adjuster 80 detects the reception signal level with the reception level detector 84. Then, the detected reception level information is compared with a predetermined value of the reception level for direction adjustment which is set in advance.

Here, the reason why the detected reception level is compared with the specified value is that the gain characteristic of the antenna 30 has a characteristic as shown in FIG. That is, for example, when the operating point is the point A, even if the level is apparently the maximum, the direction of the antenna is not correct. In this case, it is necessary to change the operating point to the point B by largely changing the direction, the elevation angle, and the like of the antenna 30, and then to perform a fine adjustment to find the correct maximum level of the point C. For this reason, the detected reception level is compared with a specified value to determine whether the level is apparently the maximum level (operation point A) or the correct maximum level (point C). As a result,
If the specified value has been reached, the reception level signal and the direction adjustment completion signal are output. If the specified value has not been reached, only the reception level signal is output to the ODU-side regulator 70 via the modem 88 and the cable-side demultiplexer 81. I do.

In the ODU-side regulator 70, the demultiplexer 71
From the main signal, etc.
It is taken in. Then, the CPU 73 displays the received level signal on the received level display section 741 based on the received level signal, and turns on the antenna adjustment LED 743 when the direction adjustment completion signal is received. The adjuster adjusts the direction of the antenna, the elevation angle, and the like so that the display of the reception level indicator 741 is maximized. At this time, if the antenna adjustment LED 743 does not light up, it is apparently at the maximum level (the operation point A in FIG. 5).
The point is shifted to a point, and fine adjustment is performed thereafter to find a correct maximum level C point. In this manner, the antenna 30 is fixed when the direction and the elevation angle at which the reception is maximum in the range where the antenna direction adjusting LED 743 is lit are obtained.

Next, the reception gain of the ODU 40 is adjusted. When the adjuster presses the reception level control start button 744 of the ODU-side adjuster 70, the CPU 73 recognizes this, and
When the reception level control start signal is transmitted to the modem 72 and the demultiplexer 7
1 to the IDU-side regulator 80. In the IDU-side coordinator 80, the reception level control start signal is separated from the main signal and the like by the cable-side demultiplexer 81 and taken into the CPU 87 of the IDU-side coordinator via the modem 88. I
The CPU 87 of the DU-side adjuster includes a reception level detector 84.
Captures the voltage level of the received IF signal detected from
Compare with a preset specified value. Here, a signal for lowering the gain is output as an ODU reception gain control signal when the value is higher than the specified value, and a signal for lowering the gain when the value is lower than the specified value.

The ODU reception gain control signal is transmitted to the modem 88
Are multiplexed with the main signal and the like by the cable-side demultiplexer 81 and output to the ODU-side adjuster 70. In the ODU-side adjuster 70, the ODU reception gain adjustment signal is separated by the demultiplexer 71, and the CP of the ODU-side adjuster is separated via the modem 72.
Import to U73. Then, it outputs to the control terminal 46 of the ODU. In the ODU 40, the control unit 41 controls the reception ATT 424 based on this signal to adjust the ODU reception gain.

According to such a procedure, the gain is automatically adjusted several times, and when the reception level detected by the reception level detector 84 of the IDU adjuster 80 reaches a specified value, the ID is adjusted.
The CPU 87 of the U-side adjuster outputs a reception level adjustment completion signal. This reception level adjustment completion signal is multiplexed with the main signal and the like by the cable-side demultiplexer 81 via the modem 88. In the ODU-side adjuster 70, the reception level adjustment completion signal is separated by the demultiplexer 71,
Take in 73. When recognizing the reception level adjustment completion signal, the CPU 73 turns on the reception level control LED 745.

Finally, the transmission gain of the ODU 40 is adjusted. When the coordinator presses the transmission level control start button 746, the CPU 73 recognizes this and sends this signal to the modem 72.
Is input to the demultiplexer 71 via the multiplexing unit, is multiplexed with the main signal and the like, and is output to the IDU-side adjuster 80. In the IDU-side adjuster 80, the transmission level adjustment start signal is separated by the cable-side demultiplexer 81, and is taken into the CPU 87 via the modem 88.

As for the transmission level of the subscriber station 20, since the TPC control is performed with the base station 10, the level of the transmission IF signal output from the IDU 60 is controlled based on the instruction of the base station 10. Have been. For example, ODU
When the transmission gain of 40 is higher than the specified value, the transmission level of the radio frequency signal to the base station increases. For this reason, the base station transmits a TPC control signal and issues an instruction to reduce the transmission output. IDU6 accordingly
0 increases the attenuation of the variable attenuator 643 and lowers the level of the transmission IF signal. Conversely, when the transmission gain of the ODU 40 is low, an instruction signal to increase the transmission output is issued by the TPC control from the base station 10, and accordingly the IDU 60 lowers the level of the transmission IF signal. IDU
The CPU 87 of the side adjuster detects the voltage level of the transmission IF signal from the transmission level detector 86 and compares it with a specified value. Here, when the level of the transmission IF signal is high, OD
Since the gain of U40 is low, an ODU transmission gain control signal for increasing the gain for ODU is output.

The ODU transmission gain control signal for increasing the gain is multiplexed with the main signal and the like by the cable-side demultiplexing section 81 via the modem 88 and transmitted to the ODU-side regulator 70. In the ODU-side adjuster 70, the ODU transmission gain control signal for increasing the gain is demultiplexed from the main signal and the like by the demultiplexing unit 71, and is taken into the CPU 73 via the modem 72. The CPU 73 outputs to the ODU 40 an ODU transmission gain control signal for increasing the gain.

In the ODU 40, the OD for increasing the gain
When receiving the U transmission gain control signal, the ODU CPU 41
Then, the level of the transmission signal is increased by reducing the degree of attenuation of the transmission ATT 431. And ODU40
Since the transmission level from the antenna increases due to the increase in the gain, the base station 10 transmits a TPC control signal and instructs to lower the level. This TPC
Since the control signal is multiplexed with the main signal transmitted from the base station, it cannot be recognized by the ODU 40. For this reason, the TPC control signal is received by the IDU 60 via the ODU 40 and the coaxial cable 50 together with the main signal.
In the IDU 60, the signal is demodulated by the demodulation / error correction decoding unit 623 and is taken into the control unit 65. The control unit 65 controls the variable attenuator 643 in the IDU to adjust the level of the transmission IF signal.

When the level of the transmission IF signal output from the IDU 40 changes, the detection level of the transmission level detector 86 of the IDU-side regulator 80 changes.
U87 is again compared with the specified value, and the OD according to the result is
A U transmission gain control signal is output. The transmission level is controlled according to such a procedure, and when the detected transmission IF signal level becomes almost close to the specified value, the CPU 87 outputs a transmission level completion signal. This transmission level completion signal is multiplexed with the main signal and the like by the cable-side demultiplexer 81 via the modem 88 and output to the ODU-side regulator 70. OD
In the U-side adjuster 70, the transmission level adjustment completion signal is separated by the demultiplexer 71, and is taken into the CPU 73 via the modem 72. When recognizing the transmission level adjustment completion signal, the CPU 73 turns on the transmission level control LED 747 to notify the adjuster that the transmission level adjustment has been completed.

When the adjustment of the gain of the ODU is completed by such a procedure, the IDU-side regulator 70 and the ODU-side regulator 80 are removed, and the IDU 60 and the coaxial cable 50 and O
By connecting the DU 40 and the coaxial cable 50, the installation adjustment is completed.

In the present embodiment, the ODU-side adjuster 70 and the IDU-side adjuster 80 are separately provided, and are configured to be removed after the adjustment is completed.
A configuration in which the unit 40 and the IDU 60 are integrated may be considered. In this case, it is necessary to control the gain of the ODU 40 so that the gain of the ODU 40 does not fluctuate due to the fluctuation of the level of the transmission and reception IF signals during operation such as rain attenuation which occurs after the adjustment of the transmission and reception gains of the ODU 40 is completed. (The level control during operation such as rain attenuation is performed by the IDU 60). For this reason, a circuit that bypasses a circuit portion related to the IDU adjuster in the IDU is provided, and after the gain adjustment of the ODU 40 is completed, a switching unit that passes through the bypass circuit is required.

As another method, an adjustment mode for making the CPU 87 perform antenna direction adjustment and gain adjustment is provided.
It is also conceivable that the operation mode can be set. In this case, after the installation adjustment is completed, by switching to the operation mode, the ODU 40 can be controlled not to output the gain control signal.

As described above, according to the present invention, the propagation loss caused by the difference in propagation distance from the base station, which is determined at the time of installation of the subscriber station and does not change thereafter, and the ODU and IDU
The cable loss caused by the difference in the length of the coaxial cable connecting the
This is coped with by adjusting the gain of U. For this reason, the range in which the level of the IDU can be adjusted is sufficient as long as it can cope with fluctuation factors such as rainfall attenuation occurring during operation. The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the gist of the present invention.

[0050]

As described above, by adopting the configuration of the present application, the propagation loss caused by the difference in propagation distance from the base station, which is determined at the time of installation of the subscriber station and does not change thereafter, and the ODU and IDU With regard to the cable loss caused by the difference in the length of the coaxial cable connecting the cable and the ODU, the gain of the ODU is adjusted when the subscriber station is installed, so that the range in which the level of the IDU can be adjusted is generated during operation. It is sufficient to be able to cope with fluctuation factors such as rain attenuation.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an overall configuration of a wireless communication system to which the present invention is applied.

FIG. 2 is a diagram for explaining a configuration of a subscriber station to which the present invention is applied.

FIG. 3 is a diagram illustrating an embodiment of the present invention.

FIG. 4 is a diagram for explaining a configuration example of an operation / display unit.

FIG. 5 is a diagram illustrating gain characteristics of an antenna.

[Explanation of symbols]

 10 Base station 20 Subscriber station 30 Antenna of subscriber station 40 Outdoor unit (ODU) 50 Coaxial cable 60 ... modem 73 of the indoor unit (IDU) 70 ----- ODU side regulator 71 ----- ODU side adjuster demultiplexer 72 ----- ODU side regulator ..... CPU of ODU-side adjuster 74 Operation / display unit 80 IDU-side adjuster 81 Cable-side demultiplexing unit 82 IDU-side demultiplexing unit 83 ····· Receiving hybrid circuit 84 ································································································ IDU side adjuster CPU 88 ・ ・ ・ ・ ・ ・ ・ Modem of IDU side regulator

Claims (6)

[Claims] 1. A transmission signal of a wireless communication apparatus comprising an antenna, a first unit connected to the antenna, and a second unit connected to the first unit via a connection line, A gain adjuster for a wireless communication device that adjusts a gain of a received signal, wherein the level of the received signal is connected between the second unit and the connection line and transmitted through the antenna and the first unit. Receiving level detecting means for detecting
Transmission level detection means for detecting a level of the transmission signal transmitted from the second unit, and comparing a signal level detected by the reception level detection means or the transmission level detection means with a preset predetermined value And a first adjuster that multiplexes and outputs a gain adjustment control signal for controlling a transmission level or a reception level of the first unit with the transmission signal according to the result; Connected between a unit and a connection line, separates the gain adjustment control signal from a transmission signal transmitted from the second adjuster, and based on the gain adjustment control signal, And a second adjuster for outputting a gain adjustment control signal. 2. An operation unit comprising: an antenna direction adjustment operation unit, a reception gain adjustment operation unit, and a transmission gain adjustment operation unit; an antenna direction adjustment notification unit; Notification unit for adjusting reception gain,
2. A gain adjuster for a wireless communication device according to claim 1, further comprising: a notification unit configured to include: a transmission gain adjustment notification unit. 3. The operation unit for receiving gain adjustment, when operated after the antenna direction adjustment is completed, the operation becomes valid, and the operation unit for transmission gain adjustment completes antenna direction adjustment and reception gain adjustment. 3. The gain adjuster for a wireless communication device according to claim 2, wherein the operation is enabled when the operation is performed after the operation. 4. A first unit connected to the antenna,
And a gain adjustment method for a wireless communication device including a second unit connected to the first unit via a connection line, wherein the first unit connected between the first unit and the connection line A first step of instructing the start of gain adjustment from the operation unit of the adjuster, and a second adjuster connected between the second unit and the connection line based on the gain adjustment instruction. A second step of detecting the instructed signal level and comparing it with a preset specified value; and a gain adjustment signal including information on whether to increase or decrease the gain based on the comparison result in the third step. A third step of outputting to the first adjuster, the first adjuster recognizing the gain adjustment signal, and outputting a gain control signal to the first unit based on the result. And a fifth step of varying a corresponding gain of the first unit based on a gain control signal from the first adjuster. Device gain adjustment method. 5. A first unit connected to the antenna,
And a gain adjustment method for a wireless communication apparatus including a second unit connected to the first unit via a connection line, wherein a second adjustment connected between the second unit and the connection line is provided. The level of the received signal is detected, and the received level information is transmitted to a first adjuster connected between the first unit and the connection line, and is transmitted to the first adjuster. By displaying a reception level, an antenna direction adjustment step of adjusting the direction of the antenna, and after completing the antenna direction adjustment, the second adjuster compares the level of the reception signal with a predetermined value set in advance. Then, based on the comparison result, a reception gain adjustment signal including information on whether to increase or decrease the reception gain of the first unit is output, and based on the reception gain adjustment signal, the first unit is output. A receiving gain adjusting step of adjusting the receiving gain of the second unit. After the receiving gain adjustment is completed, the second adjuster compares the level of the transmission signal output from the second unit with a predetermined value set in advance. By outputting a transmission gain adjustment signal including information on whether to increase or decrease the transmission gain of the first unit based on the result,
Adjusting a transmission gain of the first unit based on the transmission gain adjustment signal. 6. A base station comprising: a base station; and a subscriber station to which the first and second units are connected via a connection line.
Subscriber station transmission level control of a wireless communication system that performs subscriber station transmission level control for controlling the transmission signal level for the subscriber station so that the reception level of the reception signal at the base station falls within a predetermined range. The method, comprising: receiving, at the second unit via the first unit, a subscriber station transmission level control signal for performing the subscriber station transmission level control transmitted from the base station; A first step of controlling a level of a transmission signal of the second unit based on a transmission level control signal of a local station, and a predetermined value detected by detecting a level of a transmission signal output from the second unit. When the level of the transmission signal is higher than the specified value, a transmission gain control signal for increasing the gain is output, and when the level of the transmission signal is lower than the specified value, A second step of outputting a transmission gain control signal for reducing the power gain, a third step of varying the transmission gain of the first unit based on the transmission gain control signal, and the second step of the third step. A fourth step of detecting a change in the transmission signal level of one unit at the base station and outputting a new subscriber station transmission level control signal based on the result; Receiving at the second unit via the first unit,
A fifth step of changing the level of the transmission signal of the unit, and in the fifth step, a change in the level of the transmission signal of the second unit causes the first unit to change to the base station. A transmission level of a transmission signal transmitted to the base station is changed to a level within a predetermined range in the base station. .