JPH1141184A - Radio equipment provided with self diagnostic function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable maintenance of radio equipment and segmentation of a faulty part even in operation without cutting a main line. SOLUTION: A transmission IF signal frequency is up-converted into an RF signal frequency by an IF/RF frequency conversion part 12e, a part of a transmission RF signal is returned to an RF part 12m at a reception side by directional couplers 12g, 12h, an RF frequency RFf1 of the returned signal (the transmission RF signal) and an RF frequency RFf2 of a reception RF signal received from an opposite station are down-converted into IF frequencies IFf3, IFf2 which are different from each other by an RF/IF frequency conversion part 12n, a level of an IF signal of the frequency IFf3 in accordance with the transmission RF signal is detected and presence/absense of occurrence of a fault at the present station is detected by a simplified demodulator 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio apparatus having a self-diagnosis function, and more particularly to a radio apparatus having no standby system for detecting occurrence of a fault in its own station without interrupting a main signal.

[0002]

2. Description of the Related Art In recent years, inter-cell communication connecting base stations has attracted attention as demand for mobile communication has increased. The wireless device for inter-cell communication has a configuration in which the transmitter / receiver unit is housed in a drip-proof housing as an outdoor unit (OutDoor Unit: ODU) for ease of installation, and is monitored and controlled from an indoor unit (InDoor Unit: IDU). taking it. In addition, the wireless device has a system configuration that does not have a spare system since miniaturization and low cost are emphasized. FIG. 9 is a configuration diagram of such a wireless device, wherein 1 is an indoor unit, 2 is an outdoor unit, 3 is an antenna, and (a) shows a configuration in which an indoor unit and an outdoor unit are connected by one coaxial cable 4. (B) has a configuration in which the indoor unit and the outdoor unit are connected to each other by separate coaxial cables 5a and 5b ascending and descending.

The signals transmitted and received between the indoor unit 1 and the outdoor unit 2 include a signal to be transmitted to the opposite station, a signal received from the opposite station, a monitoring signal for notifying the indoor unit 1 of various states of the outdoor unit 2, There are various control signals for controlling the outdoor device 2 from the indoor unit 1. In the configuration of FIG. 9A, signals are transmitted and received via the coaxial cable 4 by frequency multiplexing while changing the frequency of each signal. In the configuration of FIG. 9B, each uplink signal from the indoor unit 1 to the outdoor unit 2 is transmitted. Coaxial cable 5a by frequency multiplexing by changing the frequency of
, And the frequency of each downlink signal from the outdoor unit 2 to the indoor unit 1 is changed to transmit and receive signals via the coaxial cable 5b by frequency multiplexing.

FIG. 10 is a block diagram of a transmission system / reception system in a radio apparatus, which corresponds to the radio apparatus of FIG. 9 (a), and the same parts as those of FIG. 9 (a) are denoted by the same reference numerals. ing.
In the indoor unit 1, 1a is an interface unit for transmitting and receiving a transmission signal and a reception signal to / from a terminal, 1b is a control unit for controlling the indoor unit, and 1c is a unit that modulates a carrier signal of frequency IFf1 with a transmission signal S1. Modulation unit (MO
D), 1d is a demodulator (DEM) for detecting a modulation signal of frequency IFf2 transmitted from the outdoor unit 2 and outputting a baseband reception signal S2, 1e is a signal for synthesizing signals of various frequencies and coaxial cable 4d. And coaxial cable 4
A composite splitter (hybrid circuit) that separates a signal for each frequency from the input composite signal and outputs the separated signal.

[0005] In the outdoor unit 2, 2 a is a coaxial cable 4.
A composite duplexer (hybrid circuit) that separates and outputs signals for each frequency from the input composite signal and combines the signals of various frequencies and sends out the signals to the coaxial cable 4.
b is a transmission IF amplifying unit for amplifying an IF signal of frequency IFf1 sent from the indoor unit, 2c is a local oscillator, 2d is I
IF / RF frequency converter for up-converting the frequency IFf1 of the F signal to the radio frequency RFf1, 2e a transmission RF amplifier for amplifying the transmission RF signal, 2f a band-pass filter for passing the transmission RF signal of the radio frequency RFf1, 2g Is the transmission R
A duplexer (duplexer) that outputs the F signal to the antenna 3 and takes in the received RF signal input from the antenna.
h is a band-pass filter that passes a received RF signal of the radio frequency RFf2, 2i is a received RF amplifier that amplifies the received RF signal, and 2j is the intermediate frequency IF of the received RF signal.
RF / IF frequency converter downconverting to f2, 2
k is a reception IF unit for amplifying an IF signal obtained by down-conversion.

FIG. 11 is a configuration diagram of a transmission system / reception system in a wireless device, corresponding to the wireless device of FIG. 9B, and the same parts as those of FIG. ing.
In the indoor unit 1, 1a is an interface unit for transmitting and receiving a transmission signal and a reception signal to / from a terminal, 1b is a control unit for controlling the indoor unit, and 1c is a coaxial signal obtained by modulating a carrier signal of frequency IFf1 with a transmission signal S1. A modulating unit (MOD) 1d for transmitting to the outdoor unit 2 via the cable 5a detects a modulation signal of the frequency IFf2 transmitted from the outdoor unit 2 via the coaxial cable 5b and outputs a baseband reception signal S2. Demodulation unit (DEM). In the outdoor part 2, 2b
Is a transmission IF amplifier for amplifying the IF signal of frequency IFf1 transmitted from the indoor unit 1 via the coaxial cable 5a;
c is a local oscillator, 2d is an IF / RF frequency conversion unit that up-converts the IF signal frequency IFf1 to a radio frequency RFf1, 2e is a transmission RF amplification unit that amplifies a transmission RF signal, 2d
f is a band-pass filter that passes the transmission RF signal of the radio frequency RFf1, 2g is a duplexer that outputs the transmission RF signal to the antenna 3, and takes in the reception RF signal input from the antenna, and 2h is a duplexer that receives the reception RF signal of the radio frequency RFf2. The passing band-pass filter, 2i is a reception RF amplification unit for amplifying the reception RF signal, and 2j is the frequency RF of the reception RF signal.
RF / IF that downconverts f2 to intermediate frequency IFf2
The frequency conversion unit 2k is a reception IF unit that amplifies the IF signal obtained by down-conversion and sends it out to the coaxial cable 5b.

[0007]

In the above-mentioned radio system, it is necessary to perform maintenance and isolate a failed unit (failed station) without disconnecting the main signal. However, the conventional maintenance and isolation of a faulty part are performed in a wireless system having a local station return function by performing a local station return test and performing a diagnosis of the local station.
When the local station does not have a loopback function, the local loopback tester is used to diagnose the local station and to isolate the faulty part.

FIG. 12 is an explanatory diagram of the faulty part isolation control by the local station loopback function.
The station antenna, 2 'is the outdoor equipment of station B, and 3' is the antenna of station B. If the communication from the A station to the B station becomes abnormal during bidirectional communication between the A station and the B station, the A station →
Stop bidirectional communication from station B, station B to station A. Thereafter, a signal is transmitted from the indoor unit 1 to the outdoor unit 2 and the signal is looped back by a route indicated by a dotted line by the own station loopback function, that is, a route from the transmission RF amplification unit 2e to the reception RF amplification unit 2i. And return to the indoor unit 1. When the transmitted signal returns, the indoor unit 1 determines that there is no failure, and when it does not return, determines that a failure has occurred.

FIG. 13 is an explanatory diagram of a faulty part isolation control by a loopback tester, 2 is an outdoor device, 6 is a loopback tester connected to an antenna terminal, and converts an input RF signal of frequency RFf1 into a frequency. It has the function of converting it to an RFf2 RF signal and outputting it. In FIG. 12, when the communication from the station A to the station B becomes abnormal during the two-way communication between the stations A and B, the two-way communication from the station A to the station B and the station B to the station A is performed. Stop. Thereafter, the antennas 3 and 3 'are removed, and the loopback tester 6 is connected instead. In this state, a signal is transmitted from the indoor unit 1 to the outdoor unit 2, and the signal is returned by the return tester 6 and returned to the indoor unit 1. Indoor part 1
If the transmitted signal returns, the own station determines that there is no failure, and if it does not return, it determines that a failure has occurred. However, the isolation method using the local station return function shown in FIG. 12 has a problem that the line must be disconnected for isolation of a faulty device, even though the line from station B to station A is normal. .
Further, the separation method using the loopback tester in FIG. 13 has the same problems as the method in FIG. 12, and also requires the work of removing the antenna and connecting the loopback tester instead. is there.

Accordingly, an object of the present invention is to make it possible to easily maintain a wireless device and isolate a faulty part even during operation without disconnecting a main line. Another object of the present invention is to enable maintenance of a wireless device and isolation of a trouble part without removing an antenna or attaching a special device such as a folding tester.

[0011]

SUMMARY OF THE INVENTION According to the present invention, there is provided a radio apparatus having a self-diagnosis function for detecting occurrence of a fault in a local station, comprising: means for up-converting an IF signal frequency to an RF signal frequency; Return means for returning a part of the signal to the receiving RF unit, RF of the return signal
Means for down-converting the frequency and the RF frequency of the RF signal received from the opposite station to mutually different IF frequencies, an IF corresponding to the RF frequency of the return signal
This is achieved by a wireless device having a self-diagnosis function including means for detecting an IF signal having a frequency or a signal level corresponding to the IF signal and detecting occurrence of a fault in the own station.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION

(A) First Embodiment FIG. 1 is a configuration diagram of a wireless device according to a first embodiment of the present invention. The outdoor unit is of a single conversion type, and the outdoor unit and the indoor unit are of one IF cable (coaxial cable). This is an example in which a connected portion is used, and an obstacle is isolated on the outdoor unit side. Reference numeral 11 denotes an indoor unit, 12 denotes an outdoor unit, 13 denotes an antenna, 14 denotes a coaxial cable (IF cable) connecting between the indoor unit and the outdoor unit, and 15 denotes a simple demodulator for detecting occurrence of a fault in the own station. The configuration of the transmission system / reception system of the indoor unit 11 is similar to that of FIG. In the outdoor unit 12, reference numeral 12a denotes a composite duplexer (hybrid circuit).
While separating and outputting a signal for each frequency from the composite signal input from the indoor unit 11 via the coaxial cable 14,
Signals of various frequencies are synthesized and transmitted to the indoor unit 11 via the coaxial cable 14, 12b is a band-pass filter that passes the IF signal of the frequency IFf1 transmitted from the indoor unit 11, and 12c is the IF signal. A transmission IF amplifier for amplification, 12d is a local oscillator, and 12e is the frequency of the IF signal.
IF / R up-converts IFf1 to radio frequency RFf1
The F frequency conversion unit 12f is a transmission RF amplification unit that amplifies a transmission RF signal.

Reference numerals 12g and 12h denote directional couplers for looping a part of the transmission RF signal back to the reception RF unit, 12i a bandpass filter passing the transmission RF signal of frequency RFf1, and 12j a transmission RF signal to the antenna 13. A duplexer that outputs and takes in the received RF signal input from the antenna 13, 12k is the received RF signal of the frequency RFf2
Bandpass filter that passes the signal, 12m is the received RF
A reception RF amplification unit that amplifies the signal and the transmission RF signal that has been looped back, 12n is an RF / IF frequency conversion unit,
The frequency RFf2 of the received RF signal is down-converted to the intermediate frequency IFf2, and the frequency RFf1 of the transmitted RF signal is down-converted to the intermediate frequency IFf1. 12p is reception RF
A band-pass filter that passes an IF signal having a frequency IFf2 obtained by down-converting the signal and inputs the resultant signal to the combining / demultiplexing unit 12a, and 12q passes an IF signal having a frequency IFf1 obtained by down-converting a transmission RF signal. 12r, a local oscillator for outputting a signal of a predetermined frequency, and 12s, a frequency converter for converting the intermediate frequency IFf1 to a frequency IFf3.

The intermediate frequency IFf1 transmitted from the indoor unit 11
Are separated by the combiner / demultiplexer 12a, input to the transmission IF amplifier 12c via the bandpass filter 12b, and are amplified there. After amplification, the IF signal is up-converted to an RF signal of frequency RFf1 by an IF / RF frequency conversion unit 12e, amplified to a specified level by a transmission RF unit 12f, transmitted through a duplexer 12j to an opposite station from an antenna 13 via a duplexer 12j. You. Further, the reception RF signal of the frequency RFf2 from the opposite station received by the antenna 13 passes through the duplexer 12j, is amplified by the reception RF unit 12m, and is then reduced by the RF / IF frequency conversion unit 12n to the specified IF frequency of the frequency IFf2. The signal is converted and then selected and amplified by the band-pass filter 12p.
4 to the indoor unit 11. In parallel with the above,
A part of the transmission RF signal of the frequency RFf1 is
g and 12h, is input to the receiving RF amplifier 12m in a looped manner, and after being amplified there, the RF / IF frequency converter 12
n is down-converted into an IF signal of frequency IFf1. The IF signal of frequency IFf1 is a bandpass filter 1
2q, selected and amplified, and then the frequency converter 12s
The frequency is converted from the frequency IFf1 to the frequency IFf3 and input to the simple demodulator 15.

As described above, the indoor unit 11 has the IF of the frequency IFf1.
When transmitting a signal, the simple demodulator 15 can demodulate the signal of the frequency IFf3 if the own station is operating normally, and the simple demodulator 15 cannot demodulate the signal of the frequency IFf3 if the own station is abnormal. That is, by connecting the simple demodulator 15 to the monitoring terminal MT, it is possible to determine whether or not the own station return signal (signal of the frequency IFf3) can be normally received without disconnecting the main line even during operation. Station normal / abnormal can be detected.

(B) Second Embodiment FIG. 2 is a block diagram of a wireless device according to a second embodiment of the present invention. The outdoor unit is a single conversion system, and the outdoor unit and the indoor unit have one IF cable (coaxial cable). This is an example in which a faulty part is isolated on the indoor side with a configuration connected by a cable). The second embodiment differs from the first embodiment of FIG. 1 in that (1) the combined duplexer 12a of the outdoor unit 12
The IF signal of frequency IFf2 obtained by frequency-converting the signal and the frequency IF obtained by frequency-converting the transmission RF signal
f3 IF signal is synthesized and transmitted to the indoor unit 11 via the IF cable 14. (2) The simple demodulator 15 is provided on the indoor unit 11 side, and the indoor unit detects normal / abnormal of its own station. This is the point that is the same as that of the first embodiment.

In the indoor unit 11, 11a is a frequency IFf1.
A modulation unit that modulates a carrier signal (not shown) with the transmission signal S1 and outputs the modulated signal;
Reference numerals c and 11d denote band-pass filters of frequencies IFf2 and IFf3, respectively, and reference numeral 11e denotes a combination for transmitting an IF signal of frequency IFf1 to the IF cable 14 and distributing a signal transmitted from the outdoor unit 12 to the band-pass filters 11c and 11d. A splitter 11f is a detector that receives an IF signal having a frequency IFf2 and demodulates the IF signal into a baseband received signal S2.
The simple demodulator 15 is connected to the band pass filter 11c via the monitoring terminal MT.

Intermediate frequency IFf1 transmitted from indoor unit 11
Are separated by the combiner / demultiplexer 12a, input to the transmission IF amplifier 12c via the bandpass filter 12b, and are amplified there. After amplification, the If signal is up-converted into an RF signal of frequency RFf1 by an IF / RF frequency converter 12e, amplified to a specified level by a transmission RF unit 12f, transmitted through a duplexer 12j to an opposite station from an antenna 13 via a duplexer 12j. You. Further, the reception RF signal of the frequency RFf2 from the opposite station received by the antenna 13 passes through the duplexer 12j, is amplified by the reception RF unit 12m, and is then reduced by the RF / IF frequency conversion unit 12n to the specified IF frequency of the frequency IFf2. The signal is converted and then selected and amplified by the band-pass filter 12p.
4 to the indoor unit 11. The composite splitter 11e of the indoor unit 11 distributes the signal transmitted from the outdoor unit 12 to the band pass filters 11c and 11d, the band pass filter 11d passes the IF signal of the frequency IFf2, and the detector 11f outputs the signal of the frequency IFf2. Is demodulated into a baseband received signal S2 and output.

In parallel with the above, a part of the transmission RF signal of the frequency RFf1 is received via the directional couplers 12g and 12h.
The signal is fed back to the F amplifier 12m, amplified there, and then amplified by the RF / IF frequency converter 12n.
Downconverted to a signal. IF of frequency IFf1
The signal is selected and amplified by the band-pass filter 12q, and thereafter, the frequency converter 12 converts the frequency IFf1 to the frequency IFf3.
And is input to the combining / separating device 12a. The combiner 12a combines the IF signal of the frequency IFf3 with the IF signal of the frequency IFf2, and combines the IF signal of the frequency IFf2 with the indoor unit 1 via the IF cable 14.
Send to 1. The combined duplexer 11e of the indoor unit 11 converts the signal transmitted from the outdoor unit 12 into a bandpass filter 11e.
c and 11d, and the bandpass filter 11c passes the IF signal of the frequency IFf3 and inputs the signal to the simple demodulator 15. As described above, when the indoor unit 11 transmits the IF signal of the frequency IFf1, if the own station is operating normally, the simple demodulator 15
Can demodulate the signal of frequency IFf3, and if the own station is abnormal, the simple demodulator 15 cannot demodulate the signal of frequency IFf3. That is, by connecting the simple demodulator 15 to the monitoring terminal MT, the main line is not disconnected even during operation,
The normal / abnormal state of the own station can be detected based on whether or not the own station return signal (signal of frequency IFf3) is normally received.

(C) Third Embodiment FIG. 3 is a block diagram of a wireless device according to a third embodiment of the present invention. The outdoor unit uses a single conversion system, and the outdoor unit and the indoor unit use two IF cables (coaxial cables). This is an example in which a faulty part is isolated on the outdoor part side. The third embodiment differs from the first embodiment in FIG. 1 in that (1) the indoor unit 11 and the outdoor unit 12 are connected by two IF cables (coaxial cables) 16a and 16b; 2) The upstream signal from the indoor unit 11 to the outdoor unit 12 is IF
It is configured to be transmitted via the cable 16a and a down signal from the outdoor unit 12 to the indoor unit 11 is transmitted via the IF cable 16b, and is the same as the first embodiment. Signs are attached.

In the outdoor unit 12 shown in FIG. 3, 12t is a hybrid circuit for distributing an input signal, and 12u is an I of a frequency IFf2 obtained by down-converting a received RF signal.
A band-pass filter that selects and passes the F signal, 12v is a reception IF amplification unit that amplifies the IF signal of frequency IFf2 to a specified value and sends it out to the down IF cable 16b, and 12w downconverts the folded transmission RF signal. This is a bandpass filter that selects and passes the obtained IF signal of the frequency IFf1 and inputs it to the simple demodulator 15.

The IF signal of the frequency IFf1 transmitted from the indoor unit 11 via the upstream IF cable 16a is
, And is amplified here. After amplification, the IF signal is up-converted to an RF signal of frequency RFf1 by an IF / RF frequency conversion unit 12e, amplified to a specified level by a transmission RF unit 12f, and shared.
Is transmitted from the antenna 13 to the opposite station.
Further, the reception RF signal of the frequency RFf2 from the opposite station received by the antenna 13 is transmitted through the duplexer 12j to the reception RF unit 12m.
Amplified by Thereafter, the RF / IF frequency conversion unit 12n down-converts the signal into an IF signal having a frequency IFf2, and then inputs the down-converted IF signal to the reception IF amplification unit 12v via the hybrid circuit 12t and the band-pass filter 12u. The reception IF amplifying unit 12v amplifies the IF signal of the frequency IFf2 and sends out the amplified IF signal to the indoor unit 11 via the IF cable 16b.

In parallel with the above, a part of the transmission RF signal of the frequency RFf1 is received via the directional couplers 12g and 12h.
The signal is fed back to the F amplifier 12m, amplified there, and then amplified by the RF / IF frequency converter 12n.
Downconverted to a signal. IF of frequency IFf1
The signal is input to the band-pass filter 12w via the hybrid circuit 12t, where it is selected, amplified, and input to the simple demodulator 15. As described above, the indoor unit 11 has the frequency IF
When transmitting the IF signal of f1, the simple demodulator 15 can demodulate the signal of the frequency IFf1 if the own station is operating normally, and the simple demodulator 15 can demodulate the signal of the frequency IFf1 if the own station is abnormal. Cannot demodulate. That is, the simple demodulator 1 is connected to the monitoring terminal MT.
5 to detect the normal / abnormal state of the local station by checking whether the local loopback signal (signal of frequency IFf1) can be received normally without disconnecting the main line even during operation. Can be.

(D) Fourth Embodiment FIG. 4 is a block diagram of a wireless device according to a fourth embodiment of the present invention. The outdoor unit is a single conversion system, and the outdoor unit and the indoor unit have two IF cables (coaxial cables). This is an example in which a faulty part is isolated on the indoor side with a configuration connected by a cable). The fourth embodiment differs from the third embodiment in FIG. 3 in that (1) the configuration (12t to 12w) for separating the IF signals of the frequencies IFf1 and IFf2 from the outdoor unit 12 is deleted, and the RF / IF frequency conversion is performed. (2) The simple demodulator 15 is provided in the indoor unit 11 so that the indoor unit can detect the normal / abnormal state of its own station. The same parts as in the third embodiment are denoted by the same reference numerals.

In the indoor unit 11, the frequency 11f1 is the frequency IFf1.
A modulation unit that modulates the carrier signal (not shown) with the transmission signal S1 and outputs the modulated signal to the IF cable 16a.
IFf2 IF signal is input and baseband received signal S
2, a detection circuit for demodulating the IF signal 2; a hybrid circuit 11g for distributing a composite IF signal of the frequencies IFf1 and IFf2 input via the IF cable 16b; 11h a band-pass filter for passing / amplifying the IF signal of the frequency IFf2; IF
This is a bandpass filter that passes the IF signal of f1, and the simple demodulator 15 is connected to the bandpass filter 11i via the monitoring terminal MT.

The IF signal of the frequency IFf1 transmitted from the indoor unit 11 via the upstream IF cable 16a is
, And is amplified here. After amplification, the IF signal is up-converted to an RF signal of frequency RFf1 by an IF / RF frequency conversion unit 12e, amplified to a specified level by a transmission RF unit 12f, and shared.
Is transmitted from the antenna 13 to the opposite station.
Further, the reception RF signal of the frequency RFf2 from the opposite station received by the antenna 13 is transmitted through the duplexer 12j to the reception RF unit 12m.
Amplified by Thereafter, the RF / IF frequency converter 12n down-converts the signal into an IF signal having a frequency IFf2, and transmits the IF signal to the indoor unit 11 via the IF cable 16b. The hybrid circuit 11g and the bandpass filter 11h of the indoor unit 11 input the IF signal of the frequency IFf2 input via the IF cable 16b to the detection unit 11f,
The detector 11f demodulates the IF signal of the frequency IFf2 into a baseband received signal S2 and outputs the demodulated signal.

In parallel with the above, a part of the transmission RF signal of the frequency RFf1 is received via the directional couplers 12g and 12h.
The signal is fed back to the F amplifier 12m, amplified there, and then amplified by the RF / IF frequency converter 12n.
Down converted to a signal, and IF cable 16b
Is transmitted to the indoor unit 11 via the. The hybrid circuit 11g and the bandpass filter 11i of the indoor unit 11
IF of frequency IFf1 input via F cable 16b
The signal is input to the simple demodulator 15. From the above, indoor part 1
1 transmits an IF signal of frequency IFf1, the simple demodulator 15 can demodulate the signal of frequency IFf1 if the own station is operating normally, and the simple demodulator 15 can demodulate the frequency IFf1 if the own station is abnormal.
The signal of IFf1 cannot be demodulated. That is, by connecting the simple demodulator 15 to the monitoring terminal MT, it is possible to determine whether or not the own station return signal (signal of the frequency IFf1) can be normally received without disconnecting the main line even during operation. Station normal / abnormal can be detected.

(E) Fifth Embodiment FIG. 5 is a block diagram of a wireless device according to a fifth embodiment of the present invention. The outdoor unit uses a double conversion system, and the outdoor unit and the indoor unit use two IF cables (coaxial cable). This is an example in which a faulty part is isolated on the outdoor part side. The fifth embodiment differs from the third embodiment of FIG. 3 in that (1) the outdoor unit 12 is of a double conversion type, and a frequency converter is connected in two stages in a transmission system and a reception system. (2) The third embodiment is that a local station frequency extracting unit is formed between the first and second frequency converters of the receiving system, and the extracted IF signal is input to the simple demodulator 15. The same parts as in the example are denoted by the same reference numerals.

In the outdoor unit 12, 31 is a first transmission system.
The IF converter of the first stage, which converts the IF signal of the frequency IFf1 received from the indoor unit 11 through the IF cable 16a into a frequency
The frequency is converted to an IF signal of IFf1 'and the IF signal is transmitted.
IF / RF frequency converter 12 at the next stage via F amplifier 12c
c. In the frequency converter 31,
31a is a transmission IF amplifier for amplifying an IF signal, 31b is a local oscillator for outputting a signal of a predetermined frequency, and 31c is a frequency converter for frequency-converting an IF signal of a frequency IFf1 into an IF signal of a frequency IFf1 '.

Reference numeral 32 denotes a demultiplexer for separating the IF signals of the frequencies IFf2 and IFf1 'output from the RF / IF frequency converter 12n. Reference numeral 32a denotes a hybrid circuit for distributing a composite IF signal of the frequencies IFf2 and IFf1'. 32b is the IF of frequency IFf2
A band-pass filter 32c for selecting / passing a signal, 32c is a band-pass filter for selecting an IF signal of the frequency IFf1 'and inputting the signal to the simple demodulator 15. Reference numeral 33 denotes a second-stage frequency converter of the receiving system, which converts the IF signal of the frequency IFf2 output from the band-pass filter 32b into an IF signal of the frequency IFf1.
The IF signal is converted to a signal and the IF signal is
Is transmitted to the indoor unit 11 via the. In this frequency converter 33, 33a is a local oscillator that outputs a signal of a predetermined frequency, 33b is a frequency converter that frequency-converts an IF signal of a frequency IFf2 into an IF signal of a frequency IFf1,
c is a reception IF amplifier for amplifying and outputting an IF signal.

The IF signal of the frequency IFf1 transmitted from the indoor unit 11 via the upstream IF cable 16a is
Is converted to an IF signal having a frequency IFf1 'by the first-stage frequency converter 31. Then, the frequency-converted IF
The signal is input to the transmission IF amplifier 12c, where it is amplified. After amplification, the IF signal is up-converted into an RF signal of frequency RFf1 by an IF / RF frequency conversion unit 12e, amplified to a specified output level by a transmission RF unit 12f, and transmitted from the antenna 13 to the opposite station via the duplexer 12j. Sent. Also, the frequency RF from the opposite station received by the antenna 13
The reception RF signal of f2 passes through the duplexer 12j and is received by the reception RF unit 1
Amplified at 2 m. Thereafter, the RF / IF frequency converter 12
n, the signal is down-converted into an IF signal of frequency IFf2, and then input to a second-stage frequency converter 33 via a demultiplexer 32, where it is frequency-converted into an IF signal of frequency IFf1 and connected to an IF cable 16b. The data is sent to the indoor unit 11 via the Internet.

In parallel with the above, a part of the transmission RF signal of the frequency RFf1 is received via the directional couplers 12g and 12h.
The signal is looped back to the F amplifier 12m, amplified there, and then amplified by the RF / IF frequency converter 12n at the frequency IFf1 '.
Down-converted to F signal. The IF signal of the frequency IFf1 'is input to the band-pass filter 32c via the hybrid circuit 32a, where it is selected and amplified, and input to the simple demodulator 15. As described above, when the indoor unit 11 sends out the IF signal of the frequency IFf1, the simple demodulator 15 can demodulate the signal of the frequency IFf1 'if the own station is operating normally, and the simple demodulator 15 if the own station is abnormal. The demodulator 15 has a frequency IFf
1 'signal cannot be demodulated. That is, by connecting the simple demodulator 15 to the monitoring terminal MT, it is determined whether or not the own station return signal (signal of the frequency IFf1 ') can be normally received without disconnecting the main line even during operation. The normal / abnormal state of the own station can be detected.

(F) Sixth Embodiment FIG. 6 is a block diagram of a radio apparatus according to a sixth embodiment of the present invention. The outdoor unit is a double conversion system, and the outdoor unit and the indoor unit have two IF cables (coaxial cables). This is an example in which a faulty part is isolated on the indoor side with a configuration connected by a cable). The sixth embodiment is different from the fifth embodiment of FIG. 5 in that (1) a hybrid circuit 34 is provided in the outdoor unit 12 to synthesize IF signals of frequencies IFf1 and IFf1 ′ to produce an IF cable 1;
(2) The simple demodulator 15 is provided in the indoor unit 11 so that the indoor unit can detect the normal / abnormal state of the own station. The same reference numerals are given.

In the indoor unit 11, the frequency 11f1 is the frequency IFf1.
A modulation unit that modulates the carrier signal (not shown) with the transmission signal S1 and outputs the modulated signal to the IF cable 16a.
IFf1 IF signal is input and baseband received signal S
2, a detection circuit for demodulating 2; a hybrid circuit 11g for distributing a composite IF signal of frequencies IFf1 and IFf1 'input via the IF cable 16b; a band-pass filter 11h for passing / amplifying an IF signal of frequency IFf1; frequency
This is a band-pass filter that passes the IF signal of IFf1 ', and the simple demodulator 15 is connected to the band-pass filter 11i via the monitoring terminal MT.

The IF signal of the frequency IFf1 transmitted from the indoor unit 11 via the upstream IF cable 16a is
Is converted to an IF signal having a frequency IFf1 'by the first-stage frequency converter 31. Then, the frequency-converted IF
The signal is input to the transmission IF amplifier 12c, where it is amplified. After amplification, the IF signal is up-converted into an RF signal of frequency RFf1 by an IF / RF frequency conversion unit 12e, amplified to a specified output level by a transmission RF unit 12f, and transmitted from the antenna 13 to the opposite station via the duplexer 12j. Sent. Also, the frequency RF from the opposite station received by the antenna 13
The reception RF signal of f2 passes through the duplexer 12j and is received by the reception RF unit 1
Amplified at 2 m. Thereafter, the RF / IF frequency converter 12
The signal is down-converted into an IF signal of frequency IFf2 by n, and then input to the second-stage frequency converter 33 via the demultiplexer 32. The frequency converter 33 converts the frequency IFf2 to the frequency IFf1, and converts the IF signal obtained by the frequency conversion from the hybrid circuit 34 to the IF cable 16
The data is sent to the indoor unit 11 via the terminal b. The hybrid circuit 11g and the bandpass filter 11h of the indoor unit 11
IF of frequency IFf1 input via F cable 16b
The signal is input to the detector 11f, and the detector 11f
The IF signal of IFf1 is demodulated into a baseband received signal S2 and output.

In parallel with the above, a part of the transmission RF signal of the frequency RFf1 is received via the directional couplers 12g and 12h.
The signal is looped back to the F amplifier 12m, amplified there, and then amplified by the RF / IF frequency converter 12n at the frequency IFf1 '.
Down-converted to F signal. The IF signal of the frequency IFf1 'is input to the band-pass filter 32c via the hybrid circuit 32a, where it is selected and amplified, and input to the hybrid circuit 34. Hybrid circuit 34
Is the IF cable of the input frequency IFf1 '.
The data is sent to the indoor unit 11 via 6b. The hybrid circuit 11g and the bandpass filter 11i of the indoor unit 11 input the IF signal of the frequency IFf1 'input via the IF cable 16b to the simple demodulator 15. As described above, when the indoor unit 11 sends out the IF signal of the frequency IFf1, the simple demodulator 15 can demodulate the signal of the frequency IFf1 'if the own station is operating normally, and the simple demodulator 15 if the own station is abnormal. The demodulator 15 cannot demodulate the signal of the frequency IFf1 '. That is, by connecting the simple demodulator 15 to the monitoring terminal MT, it is determined whether or not the own station return signal (signal of the frequency IFf1 ') can be normally received without disconnecting the main line even during operation. The normal / abnormal state of the own station can be detected.

(G) Seventh Embodiment FIG. 7 is a block diagram of a radio apparatus according to a seventh embodiment of the present invention. The outdoor unit uses a double conversion system, and the outdoor unit and the indoor unit use two IF cables (coaxial cable). This is an example in which a faulty part is isolated on the outdoor part side. The seventh embodiment differs from the fifth embodiment in FIG. 5 in that a branching unit 32 is provided after the second-stage frequency conversion unit 33. The same reference numerals are given.

The IF signal of frequency IFf1 transmitted from the indoor unit 11 via the upstream IF cable 16a is
Is converted to an IF signal having a frequency IFf1 'by the first-stage frequency converter 31. Then, the frequency-converted IF
The signal is input to the transmission IF amplifier 12c, where it is amplified. After amplification, the IF signal is up-converted into an RF signal of frequency RFf1 by an IF / RF frequency conversion unit 12e, amplified to a specified output level by a transmission RF unit 12f, and transmitted from an antenna 13 to a counter station via a duplexer 12j. Sent. Also, the frequency from the opposite station received by the antenna 13
The reception RF signal of RFf2 is amplified by the reception RF unit 12m via the duplexer 12j and input to the RF / IF frequency conversion unit 12n. The RF / IF frequency converter 12n converts the received RF signal to the frequency I.
The signal is down-converted to an IF signal of Ff2 and input to the next-stage frequency converter 33. The frequency converter 33 converts the frequency of the input signal into an IF signal of the frequency IFf1, and the splitter 33 extracts the IF signal of the frequency IFf1 and sends it to the indoor unit 11 via the IF cable 16b after amplification.

In parallel with the above, a part of the transmission RF signal of the frequency RFf1 is received via the directional couplers 12g and 12h.
The signal is looped back and input to the F amplifier 12m, amplified there, and then input to the RF / IF frequency converter 12n. The RF / IF frequency converter 12n down-converts the transmission RF signal into an IF signal having a frequency IFf1 'and inputs the downconverted RF signal to the next-stage frequency converter 33. The frequency converter 33 converts the input signal to a frequency IFf1 ″
Frequency conversion into the IF signal of
The IF signal of 1 ″ is extracted and input to the simple demodulator 15. As described above, when the indoor unit 11 transmits the IF signal of the frequency IFf1, if the own station is operating normally, the simple demodulator 15 The signal of IFf1 "can be demodulated, and the simple demodulator 15 cannot demodulate the signal of the frequency IFf1" when the own station is abnormal. That is, the simple demodulator 15 is connected to the monitoring terminal MT, so that it is in operation. Even if the main station is not disconnected, the normal / abnormal state of the own station can be detected based on whether or not the own station return signal (signal of frequency IFf1 ″) is normally received.

(H) Eighth Embodiment FIG. 8 is a block diagram of a radio apparatus according to an eighth embodiment of the present invention. The outdoor unit is a double conversion system, and the outdoor unit and the indoor unit have two IF cables (coaxial cable). This is an example in which a faulty part is isolated on the indoor side with a configuration connected by a cable). The eighth embodiment differs from the fifth embodiment of FIG. 5 in that (1) the branching unit 32 is deleted from the outdoor unit 12 and the frequency IFf2, IFf1 ′ output from the RF / IF frequency conversion unit 12n is changed. The IF signal is input to the next-stage frequency converter 33, and the frequency IF
(1) The simple demodulator 15 is provided in the indoor unit 11 so that the indoor unit can detect the normal / abnormal state of its own station. This is the point, and the same parts as those in the fifth embodiment are denoted by the same reference numerals.

In the indoor unit 11, the frequency 11f1 is the frequency IFf1.
A modulation unit that modulates the carrier signal (not shown) with the transmission signal S1 and outputs the modulated signal to the IF cable 16a.
IFf1 IF signal is input and baseband received signal S
2, a hybrid circuit for distributing a composite IF signal of frequencies IFf1 and IFf1 ″ input via the IF cable 16b; 11h, a band-pass filter for passing / amplifying the IF signal of frequency IFf1; frequency
This is a band-pass filter that passes the IF signal of IFf1 ″, and the simple demodulator 15 is connected to the band-pass filter 11i via the monitoring terminal MT.

The IF signal of frequency IFf1 transmitted from the indoor unit 11 via the upstream IF cable 16a is
Is converted to an IF signal having a frequency IFf1 'by the first-stage frequency converter 31. Then, the frequency-converted IF
The signal is input to the transmission IF amplifier 12c, where it is amplified. After amplification, the IF signal is up-converted into an RF signal of frequency RFf1 by an IF / RF frequency conversion unit 12e, amplified to a specified output level by a transmission RF unit 12f, and transmitted from an antenna 13 to a counter station via a duplexer 12j. Sent. Also, the frequency from the opposite station received by the antenna 13
The reception RF signal of RFf2 is amplified by the reception RF unit 12m via the duplexer 12j. Then, the RF / IF frequency converter 1
2n, the signal is down-converted into an IF signal having a frequency IFf2, and then input to the second-stage frequency converter 33. The frequency converter 33 converts the frequency IFf2 to the frequency IFf1, and sends the IF signal obtained by the frequency conversion to the indoor unit 11 via the IF cable 16b. Indoor part 1
The first hybrid circuit 11g and the band-pass filter 11h operate at the frequency input via the IF cable 16b.
The IF signal of IFf1 is input to the detection unit 11f, and the detection unit 11f
Is the baseband received signal S
2 and output.

In parallel with the above, a part of the transmission RF signal of the frequency RFf1 is received via the directional couplers 12g and 12h.
The signal is looped back and input to the F amplifier 12m, where it is amplified. Then, the RF / IF frequency converter 12n outputs the frequency I
The signal is down-converted into an IF signal of Ff1 'and input to the second-stage frequency converter 33. The frequency converter 33 converts the frequency IFf1 'to the frequency IFf1 ", and sends the IF signal obtained by the frequency conversion from the hybrid circuit 34 to the indoor unit 11 via the IF cable 16b. The band pass filter 11i inputs the IF signal of the frequency IFf1 ″ input via the IF cable 16b to the simple demodulator 15.

As described above, the indoor unit 11 has the IF of the frequency IFf1.
When transmitting the signal, the simple demodulator 15 can demodulate the signal of the frequency IFf1 ″ if the own station is operating normally, and the simple demodulator 15 can demodulate the signal of the frequency IFf1 ″ if the own station is abnormal. Can not. That is, by connecting the simple demodulator 15 to the monitoring terminal MT, the local station loopback signal (signal of the frequency IFf1 ″) can be obtained without disconnecting the main line even during operation.
The normal / abnormal state of the own station can be detected based on whether or not the station has been normally received. As described above, the present invention has been described with reference to the embodiments. However, the present invention can be variously modified in accordance with the gist of the present invention described in the claims, and the present invention does not exclude these.

[0045]

As described above, according to the present invention, the frequency of the transmission IF signal is up-converted to the RF signal frequency, a part of the transmission RF signal is looped back to the RF section on the receiving side, and the RF frequency of the looped-up signal is received from the opposite station. The RF frequency of the received RF signal is down-converted to a different IF frequency, and an IF signal having an IF frequency corresponding to the transmitted RF signal or a level of the signal corresponding to the IF signal is detected. Is detected, wireless devices can be easily maintained and faulty parts can be isolated even during operation without disconnecting the main line. There is no need to attach any special equipment.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a wireless device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a wireless device according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram of a wireless device according to a third embodiment of the present invention.

FIG. 4 is a configuration diagram of a wireless device according to a fourth embodiment of the present invention.

FIG. 5 is a configuration diagram of a wireless device according to a fifth embodiment of the present invention.

FIG. 6 is a configuration diagram of a wireless device according to a sixth embodiment of the present invention.

FIG. 7 is a configuration diagram of a wireless device according to a seventh embodiment of the present invention.

FIG. 8 is a configuration diagram of a wireless device according to an eighth embodiment of the present invention.

FIG. 9 is a configuration diagram of a wireless device including an indoor unit and an outdoor unit.

FIG. 10 is a configuration diagram of a first conventional wireless device.

FIG. 11 is a configuration diagram of a second conventional wireless device.

FIG. 12 is an explanatory diagram of a conventional faulty station separation method.

FIG. 13 is an explanatory diagram of another conventional fault station separation method.

[Explanation of symbols]

 11. Indoor unit 12 Outdoor unit 12a Synthetic duplexer (hybrid circuit) 12b Bandpass filter 12c Transmit IF amplifier 12d Local oscillator 12e IF / RF frequency converter 12f -Transmission RF amplifier 12g, 12h-Directional coupler 12i-Bandpass filter 12j-Duplexer 12k-Bandpass filter 12m-Reception RF amplifier 12n-RF / IF frequency converter 12p ··· bandpass filter 12q ··· bandpass filter 12r ··· local oscillator 12s · · · frequency converter 13 · · antenna 14 · · · coaxial cable (IF cable) 15 · · · simple demodulator

Claims (1)

[Claims] 1. A wireless device having a self-diagnosis function for detecting occurrence of a fault in its own station, comprising: means for up-converting an IF signal frequency to an RF signal frequency; and means for returning a part of the RF signal to a receiving-side RF unit. The RF frequency of the return signal and the R received from the opposite station
Means for down-converting the RF frequency of the F signal to different IF frequencies from each other; detecting an IF signal having an IF frequency corresponding to the RF frequency of the return signal or the level of the signal corresponding to the IF signal; A wireless device having a self-diagnosis function, comprising: means for detecting an error.