JP2000049626A - Hot standby type transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To take isolation even with a high frequency between a pair of transmission/reception devices without using the RF switches of multiple stages, to secure an insertion loss, to control the attenuation quantity of transmission signal power and to monitor the operation state of a standby system in a hot standby type transmission device. SOLUTION: A hot standby type transmission device is provided with a first transmission part 1a and a second transmission part 1b, which have the frequency conversion parts 5 of upper sideband wave signal/lower sideband wave signal power adjusting-types, amplifiers 6 and filters 7 and a control part 4 inputting a control signal switching the frequency conversion parts 5 of the upper sideband wave signal/lower sideband wave signal power adjusting- types in the first transmission part 1a and the second transmission part 1b to a present system or a standby system.

Description

DETAILED DESCRIPTION OF THE INVENTION

(Contents) Technical field to which the invention pertains Prior art (FIGS. 18 and 19) Problems to be Solved by the Invention Means for Solving the Problems (FIGS. 1 to 3) Embodiment of the Invention First Embodiment Description of Embodiment (FIGS. 4 to 8) Description of Second Embodiment (FIGS. 9 to 11) Description of Third Embodiment (FIG. 12) Description of Fourth Embodiment (FIG. 13) Fifth Description of Embodiment (Fig. 14)-Description of First Modification of Fifth Embodiment (Fig. 15)-Description of Second Modification of Fifth Embodiment (Fig. 16)-Others (Fig. 17)

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot-standby transmission apparatus suitable for use in a hot-standby standby wireless communication system.

[0003]

2. Description of the Related Art In recent years, a hot standby standby system has been introduced as a measure for improving the reliability of a line in a wireless transmission system of a backbone multiplex wireless transmission. The hot standby standby wireless system is a system that secures a transmission line safely without interrupting the line when an abnormality occurs in a wireless transmission line or during maintenance and inspection. That is, 2 located at both ends of the transmission path
Each of the stations has a pair (two) of transmission units having the same transmission frequency, and one of the two transmission units is set to the active operation, and the other transmission unit is connected to an amplifier. This is a system in which a standby unit is set in a standby state in a state of being activated (hot standby state). When a transmission unit on the side of the active operation fails, the system is switched to a standby transmission unit instantaneously or at a required timing. To ensure that the line is secure.

[0004] Further, a method of selecting a transmission unit is specifically performed by inserting a means that causes insertion loss into a signal path of a transmission unit. That is, in a pair of transmission units having the same transmission frequency, in one transmission unit,
Signal power is introduced into the antenna and transmitted. In the other transmission unit, an insertion loss such as an RF switch is inserted into the signal path of the transmission unit so that the signal is separated from the antenna. The transmitting unit having the higher signal power is used as the active system, and the transmitting unit having the lower signal power is used as the standby system. Switching is performed between the pair of transmitting units as necessary, and the required D / U (Desire / Undesire
) Ratio is ensured.

FIG. 18 shows a configuration of a hot standby standby type radio system. As described above, the hot standby standby system wireless system 81 shown in FIG. 18 is a system that secures a transmission path by switching a pair of transmission / reception units without interrupting a line, and is arranged facing each other. The transmission / reception devices 70 and 75 communicate with each other, and a wireless transmission path 80.

Here, the hot standby type transmitting / receiving device 7
0 indicates that the signal transmitted from the switching center device outside the system is subjected to baseband processing, modulated, and then transmitted wirelessly to the opposing hot standby transmission / reception device 75, and simultaneously, After receiving the radio signal transmitted by the transmission / reception device 75 via the radio transmission line 80 and performing a demodulation operation, the signal is subjected to baseband processing and transmitted to an external switching center device. IDU that performs line switching, monitoring, modulation and demodulation, etc.
(In Door Unit: indoor unit) 71 and ODU (Out Door Unit: outdoor unit) 72 for performing RF signal transmission / reception processing
It is configured with and.

Here, the IDU 71 is installed in an indoor building or the like, and integrates all functions of baseband processing other than RF signal processing, line monitoring, and switching control. Also,
The ODU 72 is installed on the roof of a building or an outdoor tower,
A first transmission / reception unit 73 and a second transmission / reception unit 74 having functions specialized for RF signal processing are provided. The reason why the distributed configuration is adopted is that work such as testing and maintenance is taken into consideration.

On the other hand, a hot standby type transmitting / receiving device 75
Also, after receiving the wireless signal transmitted by the opposing hot standby type transmitting / receiving device 70 via the wireless transmission path 80 and performing demodulation operation, the signal is subjected to baseband processing,
At the same time as transmitting the signal to the external switching center, the base station processes the signal from the external switching center, modulates the signal, and wirelessly transmits the signal to the hot standby transmission / reception device 70. , An IDU 76 that performs line switching, monitoring, modulation and demodulation, and the like, and an ODU 77 that performs RF signal transmission / reception processing. Also,
The ODU 77 includes a first transmission / reception unit 78 and a second transmission / reception unit 79.

Hereinafter, the functions of the indoor device and the outdoor device will be described. The IDU 71 is a line terminal installed in an indoor building or the like and has the following three functions. (1) A transmission function of performing baseband processing on a signal from an external switching center device, splitting the signal into two systems, and performing modulation operations on each of the two systems. (2) A receiving function in which the active transmission / reception unit demodulates a signal obtained by down-converting a radio signal from the opposite hot standby transmission / reception device 75. (3) A function of constantly monitoring the output of the transmission amplifier and selectively switching between the active transmission / reception unit and the standby transmission / reception unit at the time of failure or maintenance.

Here, a switching control unit 71a is provided to exhibit the function of selectively switching the transmission / reception unit. The switching control unit 71a sets the signal path of the first transmitting / receiving unit 73 and the second transmitting / receiving unit 74 in the ODU 72 to RF.
A control signal is output so that the RF switch of the transmitting / receiving unit serving as the active system is turned on and the RF switch of the transmitting / receiving unit serving as the standby system is turned off by opening / closing the switch.

That is, for example, the first transmitting / receiving unit 7
At 3, the transmit signal is introduced to the antenna as a transmit signal having the required RF transmit power, and at the second transmit / receive unit 74, the signal is disconnected from the input antenna because the RF switch is off. The ODU 72 is installed, for example, on the rooftop of an outdoor steel tower or a building at a distance of about 50 m to 100 m from the IDU 71, and has a transmission function of up-converting two signals of the active system and the standby system at the output of the IDU 71 and wirelessly transmitting the signals. And a receiving function of receiving and down-converting a radio signal transmitted by the opposing hot standby transmission / reception device 75.

The hot standby transmission / reception device 75
IDUs 76 and ODUs 77 in the hot standby type transmitting / receiving apparatus 70 are respectively IDUs 71 and ODU7.
2 have the same functions as those of the second embodiment, and a duplicate description thereof will be omitted. Further, the switching control unit denoted by reference numeral 76a in the IDU 76 in FIG. 18 has the same function as the switching control unit 71a.

FIG. 19 shows a hot standby type transceiver 7.
FIG. The first in the ODU 72 in the hot standby transmission / reception device 70 shown in FIG.
Each of the transmission / reception unit 73 and the second transmission / reception unit 74 has a transmission / reception unit and a control function for switching between the active system and the standby system, and includes a cable multiplexer 73a, a first bandpass filter 73b, and a transmission mixer 73c. , Local oscillator 73d, second bandpass filter 73
e, RF power amplifier 73f, RF detector 73g, ALC
(Automatic Level Controller) 7
3h, an RF switch 73i, a transmission system module including a third band filter 73j, an antenna module including an antenna duplexer 73k and an antenna 73l, a fourth band filter 73m, a low noise amplifier 73n, and a reception mixer 73.
o, a receiving module including a fifth bandpass filter 73p and a buffer 73q. Less than,
The functions of these members are listed.

The cable multiplexer 73a includes an IDU
The transmission signal outputted from the first transmission / reception unit 71, the reception signal down-converted in the reception pre-stage of the first transmission / reception unit 73, and the control signal are combined. The first bandpass filter 73b limits the band of the transmission signal output from the cable multiplexer 73a so as to minimize intersymbol interference on the receiving side.

The transmission mixer 73c includes a first bandpass filter 7
The local oscillator 73d is for up-converting the transmission signal at the output of 3b to the RF band, and is used for frequency conversion in the transmission mixer 73c or the reception mixer 73o. Second bandpass filter 7
3e is for removing local leak in the output of the transmission mixer 73c, and the RF power amplifier 73f is
This is for power-amplifying the RF signal in the second bandpass filter 73e with high efficiency.

The RF detector 73g includes an RF power amplifier 73
For monitoring the output of f, for example, using a directional coupler, it is coupled to the output signal of the RF power amplifier 73f to monitor the magnitude of the output, and outputs the result as a DC voltage. . The ALC 73h inputs a signal for transmission power control to the RF power amplifier 73f by the DC voltage output from the RF detector 73g.

The RF switch 73i is an on / off switch for a signal path. More specifically, the RF switch 73i opens and closes a signal path using a PIN diode switch. This switch is configured in multiple stages. That is, when the switch is on, the signal is coupled to the next stage, but when the switch is off, the signal path is disconnected. The switch is turned on / off by a control signal. For example, the RF switch 73i of the first transmitting / receiving unit 73 is turned on, and the RF switch 7 of the second transmitting / receiving unit 74 is turned on.
By turning off 3i, the first transmitting / receiving unit 73 can be used as the active system and the second transmitting / receiving unit 74 can be used as the standby system. In the working system, the required RF transmission power at the output of the RF switch 73i is introduced to the antenna 73l, while in the protection system, the RF transmission power is reduced to the antenna 73l.
l.

The third band filter 73j transmits the RF signal
This limits the transmission band at the output of the switch 73i. The antenna duplexer 73k includes a third bandpass filter 7
The RF signal whose transmission band is limited at the output of 3j is introduced into the antenna 73l, and the wireless signal transmitted by the opposing hot standby transmission / reception device 75 is received.

The fourth bandpass filter 73m limits the band of the received signal at the output of the antenna duplexer 73k. The low noise amplifier 73n includes a fourth bandpass filter 73m.
It amplifies the received RF signal at the output of m with low noise and high efficiency. The reception mixer 73o includes the low noise amplifier 7
The RF signal received from 3n is multiplied by the oscillation frequency from the local oscillator 73d and down-converted.

The fifth band filter 73p is connected to the reception mixer 7
From the signal at the output of 3o, IF (Intermediate Frequ
ency: intermediate frequency) is a low-pass filter for extracting a signal, and the buffer 73q
The signal received from 3p is amplified again and input to the cable multiplexer 73a.

[0021]

However, when such an RF switch 73i is provided, there are the following three disadvantages. First, according to the method of opening and closing the signal path with the RF switch 73i, as the frequency used by the system increases and the wavelength decreases, the isolation between the first transmitting / receiving unit 73 and the second transmitting / receiving unit 74 increases. And the signal leaks between the two systems of antennas 73l, and high-cost components must be used in response to the leakage.

Second, as the frequency increases,
This is disadvantageous because the insertion loss of the RF switch 73i increases. That is, this insertion loss reduces the RF output power at the end of the antenna 73l so that, for example, about 2 dB in the K band of the microwave band, the efficiency is reduced as a result. Third, the attenuation required for the RF switch 73i cannot be variably adjusted. The amount of attenuation differs depending on the system specifications, and even when the system selects a different modulation method or the like, it is necessary to adaptively adjust the amount of attenuation necessary for neglecting deterioration due to interference.

That is, according to the insertion of the RF switch, there is a problem composed of these three points. On the other hand, for the above three points, it is conceivable to perform the function of physically opening and closing the signal path in the IF band, but the state monitoring of the system is not successful. In other words, when an abnormality occurs in the active system or during maintenance and inspection, prior to switching to the standby system, it is assumed that the operation state of the standby system is normal.
Regardless of the standby state, it is necessary to constantly monitor the operation immediately before the RF switch. Therefore, if the required D / U ratio is secured by the IF stage switch, the information at the subsequent stage is lost, and the transmission amplifier is lost. There is a problem that it is not possible to always monitor the state of whether or not the transmission power is output from the power supply.

The present invention has been made in view of such a problem, and isolation can be obtained even at a high frequency between a pair of transmitting and receiving apparatuses without using a multi-stage RF switch, insertion loss can be secured, and transmission signal can be secured. It is an object of the present invention to provide a hot-standby transmission device capable of adjusting the amount of power attenuation and monitoring the operation state of a standby system.

[0025]

FIG. 1 is a block diagram showing the principle of the first invention. A hot standby type transmitting apparatus 1 shown in FIG. 1 comprises a first transmitting section 1a, a second transmitting section 1b and a control section. 4 is provided. Here, each of the first transmission unit 1a and the second transmission unit 1b includes an upper band signal / lower band signal power-adjustable frequency conversion unit 5, an amplifier 6, and a filter 7.

The upper band signal / lower band signal power adjustment type frequency converter 5 converts the frequency of the intermediate frequency signal into a radio frequency signal, and converts either the upper band signal or the lower band signal of the radio frequency signal. The amplifier 6 amplifies the radio frequency signal from the upper band signal / lower band signal power adjustment type frequency conversion unit 5, and the filter 7 includes the amplifier 6. With respect to the amplified radio frequency signal, a sideband signal corresponding to the current transmission frequency is passed.

The control unit 4 controls the upper band signal / lower band signal power adjustment type frequency converter 5 in the pair of the first transmitting unit 1a and the second transmitting unit 1b to use the active system or the standby system. A control signal for switching is input. In this way,
One of the first transmission unit 1a and the second transmission unit 1b is configured as an active transmission system, and the other of the first transmission unit 1a and the second transmission unit 1b is configured as an amplifier-activated backup transmission system. (Claim 1).

The upper band signal / lower band signal power adjustment type frequency converter 5 branches the intermediate frequency signal into two systems and adjusts the phase of one of the branched intermediate frequency signals. A signal branching unit, a first frequency conversion unit that outputs a radio frequency signal by performing frequency conversion on the intermediate frequency signal using a required local signal, and a local frequency conversion unit that uses the intermediate frequency signal for the intermediate frequency signal. A second frequency conversion unit that outputs a radio frequency signal by performing frequency conversion using a local signal having a phase different from that of the signal, and the two intermediate frequency signals from the intermediate frequency signal branching unit. The intermediate frequency switching unit input to the one frequency conversion unit or the second frequency conversion unit, and the outputs of the first frequency conversion unit and the second frequency conversion unit are multiplexed. May be configured as an image cancel mixer and a multiplexing unit for outputting to the amplifier (claim 2).

Further, the upper band signal / lower band signal power adjustment type frequency converter 5 performs frequency conversion on the intermediate frequency signal using a required local signal, thereby outputting a radio frequency signal. And a first filter that passes an upper band signal of the radio frequency signal;
A second filter provided in parallel with the first filter and passing a lower band signal of the radio frequency signal; and a signal path provided upstream or downstream of the first filter and the second filter. (A third embodiment) may be configured as a sideband selection circuit having a switch unit for switching between the two.

The upper band signal / lower band signal power adjusting type frequency converter 5 divides the intermediate frequency signal into two systems and adjusts the phase of one of the branched intermediate frequency signals. A frequency signal splitter, a first frequency converter that outputs a radio frequency signal by performing frequency conversion on the intermediate frequency signal using a required local signal, and an intermediate frequency signal used by the first frequency converter. A second frequency conversion unit that outputs a radio frequency signal by performing frequency conversion using a local signal having a phase different from that of the local signal, and converts the two intermediate frequency signals from the intermediate frequency signal branch unit into the above-described signals. The intermediate frequency switching unit input to the first frequency conversion unit or the second frequency conversion unit and the output of the first frequency conversion unit and the output of the second frequency conversion unit are combined. A multiplexing unit for outputting the radio frequency signal from the multiplexing unit, a first filter for passing the upper band signal of the radio frequency signal from the multiplexing unit, It may be configured as a circuit having a second filter that allows the lower band signal of the frequency signal to pass therethrough, and a switch unit that is provided upstream or downstream of the first filter and the second filter and that switches a signal path. Good (claim 4).

FIG. 2 is a block diagram showing the principle of the second invention. The hot standby type transmitting apparatus 2 shown in FIG.
It comprises a pair of first transmitting section 2a, second transmitting section 2b and control section 4. Here, each of the first transmission unit 2a and the second transmission unit 2b includes a variable attenuator 10, a frequency conversion unit 11, an amplifier 6, a radio frequency switch unit 12, and a filter 7.

The variable attenuator 10 attenuates the intermediate frequency signal, and the frequency converter 11
The intermediate frequency signal from 0 is subjected to frequency conversion using a required local signal to output a radio frequency signal. The amplifier 6 amplifies the radio frequency signal from the frequency conversion unit 11. The radio frequency switch section 12 allows the radio frequency signal amplified by the amplifier 6 to pass or cut off.
Is a signal for passing either the upper band signal or the lower band signal of the radio frequency signal from the radio frequency switch unit 12.

The control unit 4 controls the variable attenuator 10 and the radio frequency switch unit 12 provided in both the first transmission unit 2a and the second transmission unit 2b to control signals for switching to the active system or the standby system. Is entered. In this manner, one of the first transmission unit 2a and the second transmission unit 2b is configured as an active transmission system, and the other of the first transmission unit 2a and the second transmission unit 2b is an active amplifier standby transmission system. (Claim 5).

FIG. 3 is a block diagram showing the principle of the third invention. The hot standby type transmission device 3 shown in FIG. 3 includes a pair of a first transmission unit 3a, a second transmission unit 3b, and a control unit 4. Here, the first transmission unit 3
a and the second transmitting unit 3b respectively include a variable attenuator 10, an upper band signal / lower band signal power-adjustable frequency converter 5,
It comprises an amplifier 6 and a filter 7.

The variable attenuator 10 attenuates the intermediate frequency signal, and the upper band signal / lower band signal power adjustment type frequency converter 5 converts the intermediate frequency signal from the variable attenuator 10 into a radio frequency signal. And lowers the signal power of either the upper band signal or the lower band signal of the radio frequency signal.
Amplifies the radio frequency signal from the upper band signal / lower band signal power adjusting type frequency converter 5, and the filter 7 sets the radio frequency signal amplified by the amplifier 6 to the current transmission frequency. The corresponding sideband signal is passed.

The control unit 4 controls the variable attenuator 10 and the upper band signal / lower band signal power adjusting type frequency converter 5 in the first transmitter 3a and the second transmitter 3b to use the working system or A control signal for switching to the standby system is input. In this way, one of the first transmitting unit 3a and the second transmitting unit 3b is configured as an active transmitting system, and the first transmitting unit 3a
The other one of the second transmitting unit 3b and the second transmitting unit 3b is configured as a standby transmitting system of an amplifier active type.

The upper band signal / lower band signal power adjustment type frequency converter 5 separates the intermediate frequency signal into two systems and adjusts the phase of one of the branched intermediate frequency signals. An intermediate frequency signal splitter, a first frequency converter for outputting a radio frequency signal by performing frequency conversion on the intermediate frequency signal using a required local signal, and an intermediate frequency signal used by the first frequency converter. A second frequency conversion unit that outputs a radio frequency signal by performing frequency conversion using a local signal having a phase different from that of the local signal to be converted, and the two intermediate frequency signals from the intermediate frequency signal branching unit And a switch unit for inputting to the first frequency conversion unit or the second frequency conversion unit, and the outputs of the first frequency conversion unit and the second frequency conversion unit. May be configured as an image cancel mixer and a multiplexing section that outputs to the width unit (claim 7).

Further, the upper band signal / lower band signal power adjustment type frequency converter 5 performs frequency conversion on the intermediate frequency signal using a required local signal, thereby outputting a radio frequency signal. And a first filter for passing an upper band signal of the radio frequency signal;
A second filter provided in parallel with the first filter and passing a lower band signal of the radio frequency signal; and a signal path provided upstream or downstream of the first filter and the second filter. May be configured as a sideband selection circuit having a switch unit for switching between the two.

[0039]

Embodiments of the present invention will be described below with reference to the drawings. (A) Description of First Embodiment of the Present Invention The hot standby wireless system to which the present invention is applied utilizes the property that the levels of the upper sideband and the lower sideband are equal, and the standby side unit uses the normal sideband. By using the sideband opposite to the above as the amplifier output, the output monitoring voltage is unchanged and the normal sideband is suppressed. Less than,
For convenience of explanation, the upper band is the transmission frequency, the first transmission / reception unit is the working system, and the second transmission / reception unit is standby (standby).
It is explained as a system.

That is, in the first transmitting unit, the upper band signal is introduced to the antenna and monitored. On the other hand, the lower band signal is removed by the transmission band filter, and only the upper band signal is selectively transmitted from the antenna. Conversely, in other transmission units, the upper band signal is suppressed, so that even the upper band signal is not output from the antenna. In addition, the lower band signal of the transmitting unit that does not output the antenna is monitored but removed by the transmission band filter, similarly to the transmitting unit that outputs the antenna.

In order to generate an insertion loss for increasing or decreasing the power of the upper band signal, another circuit instead of the RF switch is inserted in the signal path of the transmission system. Further, the wireless system of the hot standby system to which the present invention is applied also has a means for monitoring the transmission output voltage so as to obtain control information for switching the transmission unit. That is, the level of the lower sideband signal, which is the image sideband, is such that a level corresponding to the standard output level is obtained, a stable DC voltage is always detected from the RF detector, and the level diagram of the subsequent stage fluctuates. It is possible to monitor the state without giving it.

FIG. 4 shows the configuration of a hot standby standby system radio system according to an embodiment of the present invention. Hot standby standby system wireless system 3 shown in FIG.
Reference numeral 1 denotes a system for switching between a pair of transmitting and receiving units to secure a transmission line safely without interrupting a line. And a wireless transmission path (also referred to as a wireless line) 30.

Here, the hot standby type transmitting / receiving apparatus 2
0 performs baseband processing on a signal sent from an exchange device outside the system, modulates the signal, wirelessly transmits the signal to the opposing hot standby type transmitting / receiving device 25, and simultaneously sets the hot standby type After receiving and demodulating the radio signal transmitted by the transmitting / receiving device 25, the signal is subjected to baseband processing and transmitted to an external switching center device. It comprises an IDU 21 for modulating and demodulating and an ODU 22 for transmitting and receiving RF signals.

The IDU 21 is a line terminal installed in an indoor building or the like, and has three functions of a transmission function, a reception function, and a transmission / reception unit selection switching function. That is, the IDU 21 performs a baseband process on a signal from an external switching center device, divides the signal into two systems, modulates the signals into two systems, and a hot standby system in which an active transmission / reception unit is opposed. Type transceiver 2
5. A receiving function to demodulate the signal obtained by down-converting the radio signal from 5, and constantly monitor the output of the transmitting amplifier to select the appropriate one of the active transmitting / receiving unit and the standby transmitting / receiving unit in the event of a failure or maintenance. It has three functions of switching. Among them, a switching control unit 21a is provided in order to exhibit a function of selectively switching the transmission / reception unit.

The switching control section 21a outputs a control signal for selectively attenuating only one upper band in a pair of transmission / reception units of the hot standby type transmission / reception device 20. ODU22 also
For example, about 50m to 100m away from IDU21,
It is installed on an outdoor steel tower or on the roof of a building.
1 has the function of up-converting the two signals of the working system and the protection system at the output of 1 and wirelessly transmitting the signal, and the function of receiving and down-converting the wireless signal transmitted by the opposing hot standby type transceiver 25. And the first
The transmission / reception unit 23 and the second transmission / reception unit 24 are provided. Then, the first transmission / reception unit 23 and the second transmission / reception unit 24 perform a transmission / reception function.

Further, one of the pair of the first transmission / reception unit 23 and the second transmission / reception unit 24 is used as an active system, and a main wave having a required RF transmission power is transmitted from the antenna. Further, since the other transmission / reception units are set as the standby system and the signal power thereof is suppressed, a required D / U ratio is ensured at the antenna port. Hereinafter, the first transmission / reception unit 23 will be described as an active system, and the second transmission / reception unit 24 will be described as a standby system.

Here, if the first transmission / reception unit 23 of the active system is out of order, the active system is switched to the second transmission / reception unit 24 instantaneously or at a required timing by a control signal output from the switching control unit 21a. Thus, the standby system is switched to be the first transmission / reception unit 23. Similarly, the opposing hot standby type transmission / reception device 25 also has an IDU 29 that performs line switching, monitoring, and modulation / demodulation,
First transmission / reception unit 2 for performing transmission / reception processing of F signal
7, and an ODU 26 comprising a second transmission / reception unit 28. The ODU 26 comprises a base station for processing a signal transmitted from an exchange unit outside the system, performs a modulation operation, and then performs a hot operation. At the same time as wireless transmission to the standby type transceiver 20, the wireless signal transmitted by the hot standby type transceiver 20 is received,
After performing the demodulation operation, the signal is subjected to baseband processing and transmitted to an external switching center device.

The IDU 29 is equivalent to the IDU 21 in the opposing hot standby type transmitting / receiving device 20, and has a switching control unit 29a having the same function as the switching control unit 21a. That is, one of the pair of the first transmission / reception unit 27 and the second transmission / reception unit 28 is used as an active system, and the required R
A main wave having F transmission power is transmitted. Also,
The other transmission / reception units serve as a standby system, in which the signal power is suppressed and the required D / U ratio is ensured at the antenna port.

Further, the ODU 26 is equivalent to the ODU 22 in the hot standby type transmitting / receiving apparatus 20,
The first transmission / reception unit 27 and the second transmission / reception unit 28 having the same functions as the first transmission / reception unit 23 and the second transmission / reception unit 24 are switched and operated. That is,
Similarly to the hot standby type transmission / reception device 20, when the first transmission / reception unit 27 of the active system fails, the second transmission / reception system transmits the second transmission / reception instantly or at a required timing by a control signal output from the switching control unit 29a. Unit 2
8 so that the standby system is switched to be the first transmission / reception unit 27.

Hereinafter, the hot standby type transmitting / receiving apparatus 2 in the hot standby type radio system 31 will be described.
The configuration within 0 will be described in detail. The configuration in the hot standby type transmitting / receiving device 25 is similar to that of the first transmitting / receiving unit 23 and the second transmitting / receiving unit 24 in the hot standby type transmitting / receiving device 20, as shown in FIG. , And the overlapping description will be omitted. Hereinafter, the first transmitting / receiving unit 27 will be described as an active system and the second transmitting / receiving unit 28 will be described as a standby system. The same applies to the following embodiments.

FIG. 5 is a detailed view of the hot standby type transmitting / receiving apparatus 20. The first transmission / reception unit 23 and the second transmission / reception unit 23 in the hot standby type transmission / reception device 20 shown in FIG.
The transmitting / receiving unit 24 performs a transmitting / receiving operation, and includes a pre-transmission unit 34, a sideband selection output unit 90,
It comprises a transmission module of the transmission post-stage unit 35 and a reception unit 36 which is a reception module.

The transmission pre-stage unit 34 performs pre-stage processing of the IF signal input from the IDU 21, and includes a cable multiplexer 34a, an IF band filter 34b, a first
It has a buffer 34c. Here, the cable multiplexer 34a includes an IF signal transmitted from the IDU 21 to the first transmission / reception unit 23, a reception IF signal output from the first transmission / reception unit 23 to the IDU 21, an IDU 21 and the first transmission / reception unit 23. 23 to bind the control signal to the control signal.

The IF band filter 34b limits the band of the transmission IF signal from the cable multiplexer 34a so that the inter-symbol interference is minimized on the receiving side.
The first buffer 34c amplifies the transmission signal from the IF band filter 34b in the IF band. The sideband selection output section 90 converts the frequency of the IF signal from the first buffer 34c into an RF signal, reduces the signal power of either the upper sideband signal or the lower sideband signal of the RF signal, and reduces the local leakage. And performs transmission amplification by performing transmission amplification, and performs transmission band limiting processing, and includes an image cancellation mixer 32, a first band rejection filter 90a, an RF power amplifier 90b, and a fourth band filter 90c.

Here, the image cancel mixer 32
Converts the IF signal from the first buffer 34c into an RF signal and reduces the signal power of either the upper band signal or the lower band signal of the RF signal. -Functions as a frequency converter that can adjust the lower band signal power. The image cancellation mixer 32 generally includes an SSB or PS
It is known as a ring modulator / demodulator for K.

Then, the image cancel mixer 3
Reference numeral 2 denotes an intermediate frequency signal branching unit 67, an intermediate frequency switching unit 33, a first frequency conversion unit 32c, It comprises a second frequency converter 32d, a 90 ° phase shifter 32e, and a synthesizer 32f. The intermediate frequency signal splitter 67 splits the IF signal into two systems and adjusts the phase of one of the split IF signals.
It comprises a 0 ° phase shifter 32b.

The in-phase hybrid device 32a is connected to the first
IF for branching the IF signal from buffer 34c into two systems
The 90 ° phase shifter 32b adjusts the phase of one of the IF signals branched from the in-phase hybrid device 32a. Further, the intermediate frequency switching unit 33 is configured by a diode switch, and receives two IFs from the in-phase hybrid device 32a.
A signal is input to the first frequency conversion unit 32c or the second frequency conversion unit 32d, and a signal input to two terminals is output as a two-terminal through a passing path by a control signal,
Alternatively, it is possible to selectively switch between two terminals output by crossing.

Here, the first frequency conversion unit 32c is connected to the IF
The signal is subjected to frequency conversion using a required local signal to output an RF signal, and the second frequency conversion unit 32d outputs the first signal to the IF signal.
The RF signal is output by performing frequency conversion using a local signal having a phase different from that of the local signal used in the frequency conversion unit 32c. The 90 ° phase shifter 32e shifts the phase by 90 degrees.

That is, the signal output from the two terminals with the same polarity is multiplied by the IF signal and the local signal in the first frequency converter 32c, and the phase is shifted by 90 degrees in the second frequency converter 32d. The delayed IF signal is multiplied by the local signal also delayed by 90 degrees in phase, and the combiner 32f combines and adds the outputs of the first frequency converter 32c and the second frequency converter 32d. As a result, the lower sideband is canceled, and the upper sideband remains.

On the other hand, the signal whose polarity has been inverted and output from the two terminals is multiplied by the local signal with the IF signal whose phase is delayed by 90 degrees in the first frequency converter 32c. , The IF signal and 9
Since the signal is multiplied by the local signal whose phase is delayed by 0 degree, the first frequency converter 3
By combining and adding the outputs of 2c and the second frequency converter 32d, the upper band is canceled and the lower band remains.

Further, the first band rejection filter 90a includes:
The RF power amplifier 90b removes local leakage from the RF signal at the output of the image cancellation mixer 32.
RF signal output from the second band rejection filter 9
0a, the power is amplified with high efficiency.

Then, the fourth bandpass filter 90c has the RF
This is a filter that passes a sideband signal corresponding to the current transmission frequency with respect to the RF signal amplified by the power amplifier 90b. FIG. 6 is a diagram for explaining a sideband switching method. The switching control unit 21a shown in FIG. 6 inputs a control signal of a reverse logic to each of the image cancel mixers 32 in the first transmitting / receiving unit 23 and the second transmitting / receiving unit 24.

That is, in the intermediate frequency switching unit 33 in the first transmission / reception unit 23 shown in FIG. Are multiplied by the sum and added by the hybrid circuit to select the upper band wave. On the other hand, the intermediate frequency switching unit 33 in the second transmitting / receiving unit 24 shown in FIG.
The lower-band wave is selected by multiplying the in-phase component and the 90-degree phase delay component of c by the same in-phase component and adding them by the hybrid circuit. Thus, only the signal power of one of the first transmission / reception unit 23 and the second transmission / reception unit 24 is reduced.

FIG. 7 shows an example of a circuit configuration of the intermediate frequency switching section 33 for performing this switching. The intermediate frequency switching unit 33 shown in FIG. 7 is a diode switch, and includes bias power supplies G1 and G2, and a switch SW1.
Input terminals T1, T2, output terminals T3, T4, capacitors C1, C2, C3, C4, diodes D1, D2, D
3, D4, and passive elements of the coils L1 and L2.

Here, the bias power supplies G1 and G2 are DC biases, respectively, and are arranged with opposite polarities. The switch SW1 is turned to the bias power supply G1 side by a control signal input from the outside. Switching is performed, or switching is performed to the bias power supply G2 side. And the bias power supply G
1, the potential of the measuring points P3 and P4 via the coil L2 is changed to the potential of the measuring point P via the coil L1.
1, P2, the potential of the diodes D2, D2
3 is on, and the diodes D1 and D4 are off. In this bias state, the signal inputted from the terminal T1 is outputted from the terminal T4 via the measuring points P1 and P4, and the signal inputted from the terminal T2 is outputted from the measuring point P1.
The signal is output from the terminal T3 via the terminals P2 and P3. That is, the signals are output in such a manner that the passage paths of the input signals intersect.

The coils L1 and L2 are connected to the measuring point P3
And the impedance between P4 and P4 so as to prevent the AC component from leaking between the two measurement points, and to cut off the AC component from the DC bias components supplied from the bias power supplies G1 and G2. Conversely, when switching to the bias power supply G2 side, the measurement point P is switched via the coil L1.
1 and P2 are at measuring points P3 and P2 via coil L2.
4, the diodes D1 and D4 are turned on, and the diodes D2 and D3 are turned off. In this bias state, the signal input from the terminal T1 is output from the terminal T3 via the measurement points P1 and P3.
The signal input from the terminal T2 is output from the terminal T4 via the measurement points P2 and P4. That is, the input signal is output as it is.

In this way, it is possible to selectively switch between outputting as it is or intersecting. Next, the intermediate frequency switching unit 33 controls the first
Between the transmitting / receiving unit 23 and the second transmitting / receiving unit 24,
A method for selectively switching the frequency will be described with reference to FIGS. FIG. 8A shows the first transmitting / receiving unit 2
3 is a layout diagram of frequencies appearing in the output of the first band rejection filter 90a of FIG. The IF signal spectrum 14 having the frequency f _IF shown in FIG. 8A is multiplied by the local frequency f _LO in the image cancellation mixer 32 to obtain a lower band signal spectrum 15a and an upper band signal spectrum 15b. A variety of sideband signal spectra are obtained. When the switch SW1 is switched to the bias power supply G1 by the intermediate frequency switching unit 33 in the first transmitting / receiving unit 23, the lower band signal spectrum 15a
Is suppressed, the first band rejection filter 90a
, The local leak is removed, and the upper band signal spectrum 15b and the suppressed lower band signal spectrum 15a appear. Then, the upper band signal spectrum 15b is converted into
It is chosen.

FIG. 8 (b) shows a frequency allocation diagram appearing in the output of the first band rejection filter 90a of the second transmission / reception unit 24. Of the lower band signal spectrum 16a and the upper band signal spectrum 16b shown in FIG.
Since the power of the upper band signal spectrum 16b is suppressed, the local leak is removed from the output of the first band rejection filter 90a, and the lower band signal spectrum 16a and the suppressed upper band signal spectrum 16b appear. . The upper band signal spectrum 16b
Is selected by the subsequent transmission filter. In this case, the switch SW1 is switched to the bias power supply G2 by the intermediate frequency switching unit 33 in the second transmission / reception unit 24, contrary to the one selected by the first transmission / reception unit 23.

Thus, in the first transmission / reception unit 23, the upper band signal spectrum 15b having the required RF transmission power of the transmission frequency f _USB is introduced to the antenna as the main wave, while in the second transmission / reception unit 24, the upper band signal is transmitted. The spectrum 16b performs frequency conversion in which the signal power is reduced to an appropriate value and the signal power is adjusted,
At the antenna port, the required D / U ratio is suppressed. It should be noted that the same hot standby type transmission / reception device 25 is also switched in a similar manner.

The transmission signal from which the local leak has been removed in this way is amplified in the transmission post-stage unit 35.
That is, the transmission post-stage unit 35 includes the first band rejection filter 9.
The signal from the amplifier 0a is amplified in transmission power and transmitted from the antenna, and the output of the amplifier is monitored to perform automatic gain control. The RF detector 35b, ALC (automatic gain controller) 35c, It has a device 35e and an antenna 35f.

The RF detector 35b monitors the output of the RF power amplifier 90b. For example, the RF detector 35b couples with the output signal of the RF power amplifier 90b using a directional coupler, and outputs the output. The magnitude of the signal power is monitored, and the result is returned to the switching control unit 21a in the IDU 21 as a DC voltage, and the transmission accident is constantly monitored.

The ALC 35c is an RF detector 35b
A signal for transmission power control is input to the RF power amplifier 90b by the DC voltage output from the RF power amplifier 90b, and the antenna duplexer 35e converts the RF signal having the transmission band limited at the output of the fourth bandpass filter 90c into the antenna 35f. While receiving the wireless signal transmitted by the opposing hot standby type transmission / reception device 25.

As described above, the hot standby transmission / reception device 20 converts the frequency of the IF signal into an RF signal and reduces the signal power of either the upper band signal or the lower band signal of the RF signal. An image cancel mixer 32 for performing a sideband signal / lower sideband signal power adjustment type frequency conversion, and an image cancel mixer 3
An RF power amplifier 90b for amplifying the RF signal from
The RF signal amplified by the RF power amplifier 90b has a pair of transmission systems including a transmission filter 90c for passing a sideband signal corresponding to the current transmission frequency, that is, the first transmission / reception unit 23 and the second transmission / reception unit 2
4, one of the transmission systems is configured as an active transmission system, and the other transmission system is configured as a standby transmission system of an amplifier active type.

Then, these first transmitting / receiving units 2
Third, the second transmission / reception unit 24 includes an intermediate frequency signal branching section 67, in which the image cancel mixer 32 branches the IF signal into two systems and adjusts the phase of one of the branched IF signals, and a required IF signal A first frequency conversion unit 32c that outputs an RF signal by performing frequency conversion using a local signal, and a local signal having a different phase from the local signal used in the first frequency conversion unit 32c for the IF signal. Frequency conversion unit 3 that outputs an RF signal by performing frequency conversion
2d and two IFs from the intermediate frequency signal branching unit 33.
An intermediate frequency switching unit 33 for inputting a signal to the first frequency conversion unit 32c or the second frequency conversion unit 32d, and a first frequency conversion unit 32c and a second frequency conversion unit 32
This means that it is provided with a combiner 32f that multiplexes the output of d and outputs it to the RF power amplifier 90b.

Further, the receiving section 36 receives the radio signal transmitted from the opposing hot standby type transmitting / receiving apparatus 25 and down-converts it to an IF signal. , A local oscillator 36c, a reception mixer 36d, a reception IF band filter 36e, and a second buffer 36f.

The third bandpass filter 36a is connected to the transmission
The low-noise amplifier 36b amplifies the received RF signal at the output of the third band-pass filter 36b with low noise. The local oscillator 36c
A local oscillator for performing frequency conversion, and the reception mixer 36d includes a reception RF signal from the low noise amplifier 36b,
The frequency of the received signal is converted by multiplying the received signal by the local frequency signal from the local oscillator 36c.

The reception IF band filter 36e is a low-pass filter for extracting an IF signal from a signal at the output of the reception mixer 36d.
The IF signal at the output of the band filter 36e is amplified again and input to the cable multiplexer 34a. With the provision of the receiving unit 36, the same frequency is received regardless of switching to the first transmitting / receiving unit 27 or the second transmitting / receiving unit 28 in the ODU 26 in the opposing hot standby type transmitting / receiving device 25. A stable line can be secured.

With such a configuration, in the first transmission / reception unit 23 of the active system, a transmission signal coming from the outside is input from the IDU 21, and the upper sideband signal is not attenuated by the sideband selection output section 90 from the antenna. Sent.
On the other hand, in the second transmission / reception unit 24 of the standby system, the transmission signal is input from the IDU 21, but the control signal from the switching control unit 21 a is input so as to suppress the upper band signal. In the selection output unit 90, the upper band signal is attenuated and is not transmitted from the antenna.

In this case, each of the RF power amplifiers 90b is subjected to feedback control by the ALC 35c so that its output has a transmission level that matches the specifications of the radio channel 30. That is, each of the selected sideband levels of both units has a level corresponding to the standard output level, and there is no change in the level diagram of the subsequent stage, and a stable detection voltage can be obtained.

The method of selecting the active transmitting / receiving unit is as follows.
First, in the control unit 21a in the IDU 21, the D of the RF detector 35b coming from one of the pair of transmitting / receiving units is set.
The C signal (transmission output monitor information) is compared with a DC signal (transmission output monitor information) coming from the other transmitting / receiving unit. Then, the control unit 21a controls the image cancel mixer 32 so that the level of the sideband becomes high with the normal unit of the transmission output monitor information or, if both are normal, the active system. Thereby, in this system, unit switching in a state where the required D / U ratio is secured is achieved.

Further, with such a configuration, in the reception system, the reception signal is processed by the first transmission / reception unit 23 of the working system and is input to the IDU 21. At this time, by operating the receiving unit 36 in the second transmitting / receiving unit 24 of the standby system, the signal (reception state information) detected by the receiving unit 36 is also detected by the first transmitting / receiving unit 23 of the active system. The received signal is input to the IDU 21 together with the received signal, and the received signals from the two units are compared in the IDU 21 to select a normal unit or, if both are normal, either one of them can be selected.

Returning to FIG. 4, the hot standby transmission / reception apparatus 2 of the hot standby wireless system 31
0, the transmission signal input from the IDU 21 is transmitted from the first transmission / reception unit 23 of the active system to the wireless line 30, and the signal is transmitted to the first transmission / reception unit 27 of the active system in the opposing hot standby type transmission / reception device 25. And transmitted to the outside via the IDU 29.

In FIG. 4, for example, when the first transmitting / receiving unit 23 fails, the first transmitting / receiving unit 23
Are switched to the standby system and the second transmission / reception unit 24 is switched to the active system. That is, a DC voltage indicating a failure is input from the RF detector 35b in the transmission post-stage unit 35 in the first transmission / reception unit 23 to the control unit 21a in the IDU 21, where an abnormality is detected and instantaneous or required. At the timing, a control signal whose logic is inverted is output from the control unit 21a, and the switch direction of the image cancellation mixer 32 in the first transmission / reception unit 23 and the switch direction of the image cancellation mixer 32 in the second transmission / reception unit 24 are switched. The working system and the protection system are switched without the line being cut off. In this way, the control unit 21a compares the detection information from both transmission / reception units to select a transmission / reception unit suitable for the working system.

Thus, the sideband can be dynamically switched. Further, since the RF switch is not provided at the last stage of transmission, there is an advantage that deterioration such as distortion and insertion loss can be reduced and power consumption can be reduced. And
Since a high-attenuation RF switch is not required and unnecessary amplification is not performed, the design conditions of the amplifier can be eased if the transmission output is at the same level. Further, since the ALC 35c added to the RF power amplifier 90b operates to bring the selected high sideband to a predetermined level,
Even if either the upper band wave or the lower band wave is selected, R
Since the DC voltage level of the F detector 35b can be obtained stably and the status of the working system and the standby system can be monitored, there is an advantage that the reliability of the system is improved.

Generally, the image frequency suppression amount of the image cancellation mixer 32 is about 20 dB, and the required D / U
Any system that satisfies the condition of ratio ≦ 20 dB can be configured in the present embodiment. In addition, it is advantageous when the transmission function is configured as a device having a closed configuration as a single module, particularly when it is constructed as an outdoor device. (B) Description of the Second Embodiment of the Present Invention In the above-described first embodiment, the upper band signal / lower band signal power adjustment type frequency converter is configured by the image cancel mixer. Can also be configured. That is, in the present embodiment, a circuit for selecting the upper band and the lower band is provided, and the IF signal is once up-converted to the RF band to generate the upper band signal and the lower band signal. By selectively passing only one of them through the bandpass filter, the sideband is selected.

FIG. 9 is a detailed diagram of a hot standby type transmitting / receiving apparatus 43 according to the second embodiment of the present invention. The hot standby transmission / reception device 43 shown in FIG. 9 is an ODU comprising an IDU 21 for switching, monitoring and modulating / demodulating lines, and a pair of modules of a first transmission / reception unit 66 and a second transmission / reception unit 66 'for transmitting / receiving RF signals.
64.

In this embodiment, for convenience of explanation, the upper band is used as the transmission frequency and the first transmitting / receiving unit 6 is used.
6 as an active system, and the second transmitting / receiving unit 66 'as a standby system. Hereinafter, the configuration of the hot standby type transmitting / receiving device 43 in the hot standby type wireless system 31 to which the present invention is applied will be described in detail. As shown in FIG.
It has a transmission / reception unit 27 and a second transmission / reception unit 28, and their configurations are the same as those of the first transmission / reception unit 66 and the second transmission / reception unit 66 '.

Here, each of the first transmission / reception unit 66 and the second transmission / reception unit 66 'includes the pre-transmission section 34, the post-transmission section 35, and the reception section 36 described in the first embodiment. It has a part 91. The sideband selection output section 91 includes a sideband selection section 37 that performs upper-sideband signal / lower-sideband signal power adjustment type frequency conversion, an RF power amplifier 91a that amplifies the transmission, and a fourth bandpass filter 91b that limits the transmission band. It is configured with.

Here, the sideband selector 37 converts the frequency of the IF signal into an RF signal and reduces the signal power of either the upper sideband signal or the lower sideband signal of the RF signal. Frequency converter 37a, RF switch 37b, first bandpass filter 37c, second bandpass filter 3
7d and a multiplexing section 37e. The frequency conversion unit 37a outputs an RF signal by performing frequency conversion on the IF signal using a required local signal, and outputs the RF signal.
The IF signal from 4c is frequency-converted to the RF band, and two upper band signals and lower band signals appear.

The RF switching unit 37b is a switch that is provided upstream or downstream of the first band filter 37c and the second band filter 37d and that switches a signal path.
The signal path of the RF signal at the output of the frequency conversion unit 37a is selected. Here, the RF switching unit 37b shown in FIG.
Are provided on the upstream side of these filters, and selectively switch signal signal paths.

The first bandpass filter 37c is a filter that allows the upper band signal of the RF signal to pass therethrough.
It has the characteristic that only the upper band wave for band-limiting the RF signal from 7b is passed. Also, the second bandpass filter 37
d is a filter that is provided in parallel with the first bandpass filter 37c and passes the lower band wave signal of the RF signal. It has such characteristics.

The multiplexing unit 37e is provided with the first bandpass filter 3
7c and the output of the two systems from the second bandpass filter 37d are combined and output to the subsequent-stage RF power amplifier 91a. As described above, the hot standby type transmission / reception device 43 converts the frequency of the IF signal into an RF signal and reduces the signal power of either the upper band signal or the lower band signal of the RF signal. The lower band signal power adjusting type frequency converter 37 and the R from the upper band signal / lower band signal power adjusting frequency converter 37;
A pair of a transmission system including an RF power amplifier 91a for amplifying the F signal and a transmission filter 91b for passing a sideband signal corresponding to the current transmission frequency for the RF signal amplified by the RF power amplifier 91a, First
The transmission / reception unit 66 and the second transmission / reception unit 66 'are provided. One of the transmission systems is configured as an active transmission system, and the other transmission system is configured as an amplifier-activated standby transmission system.

The first transmitting / receiving unit 6
6, the second transmission / reception unit 66 'is a sideband selector 3 for performing an upper band signal / lower band signal power adjustment type frequency conversion.
7, a frequency conversion unit 37a for outputting an RF signal by performing frequency conversion on the IF signal using a required local signal, a first bandpass filter 37c for passing an upper band signal of the RF signal, One band filter 37
a second bandpass filter 37d provided in parallel with the first bandpass filter c and passing the lower sideband signal of the RF signal; RF switching unit 37 for switching the road
b.

In FIG. 9, the members denoted by the same reference numerals as those used in the first embodiment are the same or have the same functions.
Further description is omitted. By the way, in the sideband selector 37, only one of the upper band signal and the lower band signal generated by the frequency converter 37a is passed, and the other transmission power is suppressed to a required D / U ratio. Selection switching is performed. FIG. 10 is a diagram for explaining a sideband switching method. The control unit 21a shown in FIG.
Is for inputting a reverse logic control signal to the RF switching unit 37b of the sideband selector 37 in the first transmitting / receiving unit 66 and to the RF switching unit 37b in the second transmitting / receiving unit 66 '.

Then, the RF in the first transmitting / receiving unit 66
In the switching unit 37b, the signal is led to a bandpass filter 37c having a pass characteristic of the upper band wave,
In the RF switching unit 37b in 6 ', a control signal of the reverse logic is input and guided to a band filter 37d having a lower band pass characteristic. This sideband selection method will be described with reference to FIGS. 11 (a) to 11 (c).

FIG. 11A shows the first transmission / reception unit 66.
Sideband selector 37 of both the first and second transmitting / receiving units 66 '
2 shows a layout of frequencies appearing in the output of the frequency conversion unit 37a. As shown in FIG. 11A, the frequency f _LSB
And a lower band signal spectrum 17a having a frequency f
Two types of sideband signal spectrums including the upper sideband signal spectrum 17b having _USB appear at the same level.

Next, FIG. 11B shows the spectrum at the output of the sideband selector 37 of the first transmission / reception unit 66. The upper band signal spectrum 18b shown in FIG. 11B is guided by the side band selector 37 in the first transmission / reception unit 66 to the first band filter 37c whose passing characteristic is on the upper band side. The lower band signal spectrum 18a is not attenuated by the first bandpass filter 37c.
Has been oppressed by Then, the subsequent fourth bandpass filter 91b allows the upper band signal spectrum 18
b is output to the subsequent stage.

FIG. 11C shows the second transmission / reception unit 6
6 shows the spectrum at the output of the sideband selector 6 'at 6'. The upper band signal spectrum 19b shown in FIG. 11 (c) is passed through the side band selector 37 in the second transmitting / receiving unit 66 'to the second band filter 3 having the lower band side as the pass characteristic.
Although guided to the 7d side and suppressed, the lower band signal spectrum 19a appears without attenuation. At this time,
Even if the upper band signal spectrum 19b is output by the subsequent fourth band filter 91b, its signal power is small. That is, the signal power is adjusted, and the antenna 35f is suppressed to the required D / U ratio.

11 (a) to 11 (c), the sideband selector 37 switches the control signal from the controller 21a in the IDU 21 so that the first transmission / reception unit 66 is switched.
, The upper band signal spectrum 18b is introduced into the antenna 35f as the main wave having the required RF transmission power of the transmission frequency f _USB via the fourth band filter 91b, while the second transmission and reception unit 66 ' The wave signal spectrum 19b is formed by the fourth bandpass filter 91b.
It is attenuated.

With such a configuration, in the first transmission / reception unit 66 of the active system, the transmission signal is input from the IDU 21, and the upper band signal is transmitted from the antenna without being attenuated in the side band selection output section 91. . On the other hand, in the second transmission / reception unit 66 'of the standby system, the transmission signal is input from the IDU 21.
Since the control signal from a is input so as to suppress the upper sideband signal, the upper sideband signal is attenuated in the sideband selection output section 91 and is not transmitted from the antenna.

In this case, the RF power amplifier 91a
Is subjected to feedback control by the ALC 35c so that its output has a transmission level that matches the specifications of the wireless propagation path 30. That is, each of the selected sideband levels of both units has a level corresponding to the standard output level, and there is no change in the level diagram of the subsequent stage, and a stable detection voltage can be obtained.

The transmission / reception unit selection method is as follows. First, in the control unit 21a in the IDU 21, the DC detector of the RF detector 35b from one of the pair of transmission / reception units is used.
The signal is compared with a DC signal coming from the other transceiver unit. Then, the control unit 21a controls the sideband selection circuit 37 so that the level of the sideband on the main wave side becomes higher. Thereby, in this system, unit switching in a state where the required D / U ratio is secured is achieved.

Further, with such a configuration, in the reception system, the reception signal is processed by the first transmission / reception unit 66 of the active system, and is input to the IDU 21. At this time, by operating the receiving unit 36 also in the second transmitting / receiving unit 66 ′ of the standby system, the signal detected by the receiving unit 36 is different from the signal detected by the first transmitting / receiving unit 66 of the working system. This ID is input to the IDU 21 together.
In U21, it is also possible to select signals received from both.

In the hot standby transmission / reception device 43 of the hot standby type radio system 31, the transmission signal input from the IDU 21 is transmitted from the first transmission / reception unit 66 of the active system to the radio line 30,
The signal is transmitted to the opposing hot standby type transmitting / receiving device 25.
, Is received by the first transmission / reception unit 27 of the working system, and is sent out through the IDU 29.

Further, for example, when the first transmitting / receiving unit 66 fails, switching is performed so that the first transmitting / receiving unit 66 becomes a standby system and the second transmitting / receiving unit 66 'becomes an active system. That is, a DC voltage indicating a failure is input from the RF detector 35b in the transmission post-stage unit 35 in the first transmission / reception unit 66 to the control unit 21a in the IDU 21. At the timing of
A control signal whose logic is inverted is output from the control unit 21a so that the level of the sideband on the main wave side is increased.
The switch direction of the F switching unit 37b is switched so that the line is not interrupted and the second transmission / reception unit 66 'is switched to the active system and the first transmission / reception unit 66 is switched to the standby system. Here, similarly to the first embodiment, the image frequency is actively used, and the image frequency is efficiently passed.
Further, the opposing hot standby type transmission device 25 performs the same operation.

In this manner, the sideband can be dynamically switched as in the first embodiment. Further, since no RF switch is provided at the final stage of transmission, there is an advantage that deterioration such as distortion and insertion loss can be reduced, and power consumption can be reduced. Since a high-attenuation RF switch is not required and unnecessary amplification is not performed, the design conditions of the amplifier can be eased if the transmission output is at the same level. Further, the ALC 35c added to the RF power amplifier 91a of the post-transmission unit 35 operates to set the selected high sideband to a predetermined level.
Even if any of the lower sidebands is selected, the RF detector 3
Since the DC voltage level of 5b can be obtained stably and the status of the working system and the standby system can be monitored, there is an advantage that the reliability of the system is improved.

Generally, the signal suppression amount of the RF switch is about 20 dB per section configuration, and the required D / U ratio ≦ 2
Any system that satisfies the condition of 0 dB can be configured in this embodiment. Here, one section means one attenuation stage. (C) Description of the Third Embodiment of the Present Invention In the present embodiment, the upper band signal / lower band signal power-adjustable frequency conversion unit includes the image cancellation mixer of the first embodiment and the second embodiment. And a sideband selector in the form.

FIG. 12 is a detailed diagram of a hot standby type transmitting / receiving apparatus 44 according to the third embodiment of the present invention. The hot standby type transmission / reception device 44 shown in FIG.
A first transmission / reception unit 46 for performing transmission / reception processing of the F signal,
The second transmission / reception unit 47 includes an ODU 45 including two modules.

Note that, also in the present embodiment, for convenience of explanation, the upper band is used as the transmission frequency and the first transmitting / receiving unit 4
6 will be described as an active system, and the second transmission / reception unit 47 will be described as a standby system. Hereinafter, the configuration of the hot standby type transmitting / receiving device 44 in the hot standby type wireless system 31 to which the present invention is applied will be described in detail. As shown in FIG. Since the configuration of the 27 and the second transmission / reception unit 28 is the same as that of the first transmission / reception unit 46 and the second transmission / reception unit 47, the duplicate description thereof is omitted.

Here, each of the first transmitting / receiving unit 46 and the second transmitting / receiving unit 47 includes the above-described transmission pre-stage unit 34,
In addition to a transmission post-stage unit 35 and a reception unit 36, the transmission unit 35 includes a sideband selection output unit 92. Further, the sideband selection output unit 92 outputs the upper band signal and the lower band signal obtained by upconverting the IF signal to the RF band.
One of which is passed as a working system and the other is used as a standby system to suppress its transmission power to a required D / U ratio. It is configured.

The sideband selector 38 performs an upper band signal / lower band signal power adjustment type frequency conversion, and includes an intermediate frequency signal branching unit 68, an intermediate frequency switching unit 33, a first frequency An image cancel mixer including a conversion unit 38c, a second frequency conversion unit 38d, a 90 ° phase shifter 38e, and a first multiplexing unit 38f; an RF switching unit 38g; a first band filter 38h;
It comprises a sideband selection circuit comprising a multiplexing section 38j.

Here, the intermediate frequency signal branching section 68
The F signal is branched into two systems and one of the branched I signals
The phase adjustment is performed on the F signal, and includes an in-phase hybrid unit 38a and a 90 ° phase shifter 38b. That is, the hot standby type transmitting / receiving device 44 converts the frequency of the IF signal into an RF signal, and reduces the signal power of either the upper band signal or the lower band signal of the RF signal. Sideband selector 38 for performing a sideband signal power adjustment type frequency converter, RF power amplifier 92a for amplifying the RF signal from sideband selector 38, and RF power amplifier 92a
A pair of transmission systems including a fourth bandpass filter 92b for passing a sideband signal corresponding to the current transmission frequency with respect to the RF signal amplified by the above, that is, a first transmission / reception unit 46 and a second transmission / reception unit 47, One transmission system is configured as an active transmission system, and the other transmission system is configured as an amplifier-activated backup transmission system.

The first transmission / reception unit 46
And the second transmission / reception unit 47, the sideband selection unit 38
However, an intermediate frequency signal branching unit 68 that divides the IF signal into two systems and adjusts the phase of one of the branched IF signals and an RF signal by performing frequency conversion on the IF signal using a required local signal. A first frequency converter 38c for outputting a signal, and a second signal for outputting an RF signal by performing frequency conversion on the IF signal using a local signal having a phase different from that of the local signal used in the first frequency converter 38c. The two-frequency IF signal from the two-frequency conversion unit 38d and the intermediate frequency signal branching unit 68 is converted into the first frequency conversion unit 38c or the second frequency conversion unit 38d.
An intermediate frequency switching unit 33 for inputting the signals to the first and second frequency converters 38c and 38d; a first multiplexing unit 38f for multiplexing the outputs of the first and second frequency converters 38d and 38d;
a first bandpass filter 38h that allows the upper bandpass signal of the RF signal from the first bandpass filter f to pass therethrough; A second bandpass filter 38i to be passed;
The first band filter 38h and the second band filter 38
It is provided with an RF switching unit 38g that is provided on the upstream side or the downstream side of i and switches the signal path.

In FIG. 12, members denoted by the same reference numerals as those used in each of the above embodiments have the same or similar functions, and further description will be omitted. Here, the signal flow of the transmission system is as follows. That is, the IF signal to be transmitted is branched into two systems in the in-phase hybrid device 38a in the intermediate frequency signal branching section 68, and the IF signal from the in-phase hybrid device 38a is
The phase is shifted by degrees. Then, the intermediate frequency switching unit 33
In the above, the signal input to the two terminals is output by the control signal according to the control signal, or the two terminals are output while crossing the path,
One of these two-terminal outputs is the first frequency converter 3
8c, the output of the local oscillator 36c is multiplied by the carrier signal, and the other output is converted by the second frequency converter 38d into a 90 ° signal.
The signal is multiplied by the signal shifted by 90 degrees in the phase shifter 38e, and multiplexed in the first multiplexing unit 38f.

At the output of the first multiplexing unit 38f, only one of the upper band signal and the lower band signal is suppressed, and the RF switching unit 38g passes a signal matching the upper band signal. The path that passes through the first bandpass filter 38h having the characteristic or the path passing through the second bandpass filter 38i having the pass characteristic matching the lower band is selected.
At 8j, the signal from the first bandpass filter 38h or the second bandpass filter 38i is returned to one system.

Then, in the RF power amplifier 92a,
The upper band signal output from the second multiplexing unit 38j is amplified, the transmission band is limited in the fourth band filter 92b, and the fourth band signal is passed through the antenna duplexer 35e in the transmission post-stage unit 35. The upper band signal from the filter 92b is introduced into the antenna 35f and transmitted. Therefore, the ID
By switching the control signals from the controller 21a in the U21, switches the sideband to be suppressed, the first transceiver unit 46, the upper sideband signal through a fourth band-pass filter 92b, the required transmission frequency f _USB While being introduced into the antenna 35f as a main wave having RF transmission power, the second transmission / reception unit 47 suppresses the upper band signal,
In 5f, the required D / U ratio is suppressed.

On the other hand, the receiving system transmits the radio signal transmitted by the opposite hot standby type transmitting / receiving device 25 to the antenna 3
The signal is received at 5f, and is subjected to detection processing at the receiving unit 36 via the antenna duplexer 35e. That is, in the third bandpass filter 36a, the band of the reception signal from the antenna duplexer 35e in the transmission post-stage unit 35 is limited,
In the low noise amplifier 36b, the third bandpass filter 36a
Is amplified with low noise, and the signal from the low-noise amplifier 36b is multiplied by the local frequency from the local oscillator 36c in the reception mixer 36d, down-converted and the IF signal is output. Then, in the reception IF band filter 36e, an IF signal is extracted from the signal at the output of the reception mixer 36d, and the IF signal at the output of the reception IF band filter 36e is again amplified in the second buffer 36f. The signal is input to the cable multiplexer 34a.

By providing such a receiving unit 36, a stable line can be established even if the switching is made to either the first transmitting / receiving unit 27 or the second transmitting / receiving unit 28 in the ODU 26 in the opposing hot standby type transmitting / receiving device 25. Can be secured. With such a configuration, in the first transmission / reception unit 46 of the working system, a transmission signal is input from the IDU 21, and the upper sideband signal is transmitted from the antenna without being attenuated in the sideband selection output unit 92.

On the other hand, in the second transmission / reception unit 47 of the standby system, the transmission signal is input from the IDU 21, but the control signal from the switching control unit 21a is input so as to suppress the upper band signal. , Sideband selection output section 92
In this case, the upper band signal is attenuated and is not transmitted from the antenna. Then, in this case, the RF power amplifier 9
2a is subjected to feedback control by the ALC 35c so that its output has a transmission level that matches the specifications of the wireless propagation path 30. That is, each of the selected sideband levels of both units has a level corresponding to the standard output level, and there is no change in the level diagram of the subsequent stage, and a stable detection voltage can be obtained.

The method of selecting the active transmission / reception unit is as follows. First, in the control unit 21a in the IDU 21, the RF detector 35b coming from one of the pair of transmission / reception units is used.
Is compared with the DC signal coming from the other transceiver unit. Then, the control unit 21a sets the sideband selection unit 38 so that the level of the sideband on the main wave side becomes higher with the normal unit of the transmission monitor information or, if both are normal, as the active system. Control it. Thereby, in this system, unit switching in a state where the required D / U ratio is secured is achieved.

Further, with such a configuration, in the receiving system, the received signal is processed by the first transmitting / receiving unit 46 of the working system and input to the IDU 21. At this time, by operating the receiving unit 36 also in the second transmission / reception unit 47 of the standby system, the signal detected by the reception unit 36 is combined with the signal detected by the first transmission / reception unit 46 of the active system. Is input to the IDU 21 and this IDU
In 21, it is possible to compare the received signals from both, and to select a normal unit or, if both are normal, either one is selected.

Here, in the hot standby transmission / reception device 44 of the hot standby type radio system 31, the transmission signal input from the IDU 21 is transmitted from the first transmission / reception unit 46 of the active system to the radio line 30,
The signal is transmitted to the opposite hot standby type transceiver 2
5 is received by the first transmission / reception unit 27 of the active system, and is transmitted to the outside via the IDU 29. When the first transmission / reception unit 46 fails, a signal is transmitted from the second transmission / reception unit 47 as an active system, and the first transmission / reception unit 46 becomes a standby system.

Further, for example, when the first transmission / reception unit 46 fails, switching is performed in the same manner as in the above embodiments so that the first transmission / reception unit 46 becomes a standby system and the second transmission / reception unit 47 becomes an active system. . That is, when a DC voltage indicating a failure is input from the RF detector 35b to the control unit 21a in the IDU 21, an abnormality is detected, and the logic is inverted from the control unit 21a instantly or at a required timing. A control signal is output and the first transmitting / receiving unit 4
6 and the switching direction of the intermediate frequency switching unit 33 and the RF switching unit 38g in the sideband selecting unit 38 in the second transmitting / receiving unit 47 are switched, so that the working system and the standby system are not interrupted. Is replaced. Further, the opposing hot standby type transmission device 25 performs the same operation.

Thus, the sideband can be dynamically switched. Further, since no RF switch is provided at the final stage of transmission, there is an advantage that deterioration such as distortion and insertion loss can be reduced, and power consumption can be reduced. And
Since a high-attenuation RF switch is not required and unnecessary amplification is not performed, the design conditions of the amplifier can be eased if the transmission output is at the same level. Further, since the ALC 35c added to the RF power amplifier 92a operates to bring the selected high sideband to a predetermined level,
Even if either the upper band wave or the lower band wave is selected, R
Since the DC voltage level of the F detector 35b can be obtained stably and the status of the working system and the standby system can be monitored, there is an advantage that the reliability of the system is improved. If the attenuation of the main wave alone is less than the required amount in each of the first and second embodiments, a higher level can be reduced by combining these two attenuation means. .

For example, when the required D / U ratio is required to be ≤40 dB, the attenuation by the image cancellation mixer and the case by the sideband selector are each about 20 dB, so that the respective advantages are not impaired. We can meet your requirements. As described above, in the present embodiment, a higher level can be reduced by combining the image cancel mixer and the sideband selector.

(D) Description of the Fourth Embodiment of the Present Invention In the above-described first to third embodiments, the attenuation of the main wave is performed by the upper band signal / lower band signal power adjustment type frequency converter. , An image cancel mixer, a sideband selector, and a combination of these two. By the way, as another method of obtaining this attenuation, a combination of a variable attenuator and an RF switch having a small attenuation can be used.

That is, instead of using an RF switch having a large number of element stages, an RF switch having a small number of element stages is employed to reduce insertion loss, and to be used in a stage (RF or IF stage) before an RF power amplifier. A variable attenuator is provided to compensate for the insufficient attenuation. In this case, the level diagram of the succeeding stage decreases, so that the attenuation of the variable attenuator needs to be controlled. That is, at the output of the final-stage RF power amplifier, a level that can be detected by the RF detector is secured, and the required D / U ratio can be obtained by the total attenuation with the final-stage RF switch. is there.

FIG. 13 is a detailed view of a hot standby type transceiver 48 according to the fourth embodiment of the present invention. The hot standby type transmission / reception device 48 shown in FIG.
A first transmission / reception unit 50 for performing transmission / reception processing of an F signal,
An ODU 49 including the second transmission / reception unit 51 is provided.

In this embodiment, for convenience of explanation, the upper band is used as the transmission frequency and the first transmitting / receiving unit 5 is used.
0 will be described as an active system, and the second transmission / reception unit 51 will be described as a standby system. Hereinafter, the configuration of the hot standby type transmitting / receiving device 48 in the hot standby type wireless system 31 to which the present invention is applied will be described in detail, but the first transmitting / receiving unit in the opposed hot standby type transmitting / receiving device 25 as shown in FIG. Since the configuration of the 27 and the second transmission / reception unit 28 is the same as that of the first transmission / reception unit 50 and the second transmission / reception unit 51, the duplicate description thereof will be omitted.

Here, the first transmission / reception unit 50 and the second transmission / reception unit 51 are both the transmission pre-stage unit 34,
It has a receiving unit 36 and an attenuation transmitting unit 39. The attenuation transmitting unit 39 attenuates the transmission signal in the IF band by the variable attenuator, performs up-conversion, further attenuates the signal by the RF switch, and determines the D / U ratio required for the antenna by the total attenuation. And a variable attenuator 39a capable of adjusting the amount of attenuation, and a frequency converter 39b, a first bandpass filter 39c,
A member for amplifying a transmission signal including an RF power amplifier 39d, an RF detector 39e, and an ALC (automatic gain controller) 39f, an RF switch 39g having a small number of element stages for opening and closing a signal path, a second bandpass filter 39h, and an antenna It is configured to include a common unit 39i and a member including an antenna 39j.

That is, the ODU 49 of the hot standby type transmitting / receiving apparatus 48 has
A variable attenuator 39a for attenuating a signal, a frequency converter 39b for outputting an RF signal by performing frequency conversion on an IF signal from the variable attenuator 39a using a required local signal, and a frequency converter 39b RF power amplifier 39d for amplifying the RF signal from
An RF switch 39g for passing or blocking the RF signal amplified by the power amplifier 39d, and an RF switch 39g
A pair of transmission systems including a second bandpass filter 39h that passes either the upper sideband signal or the lower sideband signal of the RF signal from the transmitter, that is, the first transmission / reception unit 50 and the second transmission / reception unit 51 Therefore, one of the transmission systems is configured as a working transmission system, and the other transmission system is configured as an amplifier-activated backup transmission system.

In FIG. 13, members denoted by the same reference numerals as those used in each of the above embodiments have the same or similar functions, and further description will be omitted. The signal flow of the transmission system is as follows. That is, in the variable attenuator 39a, I
The F signal is attenuated by a required amount, and the frequency conversion unit 3
9b, the output signal from the variable attenuator 39a is R
Up-converted to the F band and the first bandpass filter 39c
, The local leak is removed, and the upper band signal is power-amplified with high efficiency in the RF power amplifier 39d.

The signal output from the RF power amplifier 39d is subjected to transmission level adjustment in the RF switch 39g so as to match the specifications of the radio channel 30 when the signal is on, and to The signal path is disconnected from the antenna. Further, in the second bandpass filter 39h, the upper band wave is selected from the signal from the RF switch unit 39g, and the transmission band is limited. In the antenna duplexer 39i, the upper band wave from the second bandpass filter 39h is transmitted. The signal is introduced to antenna 39j.

The transmission signal power-amplified by the RF power amplifier 39d is monitored by the RF detector 39e. The result is that ALC39
f and IDU 21 are fed back and compared with the other detection information, a system suitable for the active system is selected, and the state is constantly monitored so that the attenuation control is performed so that the transmission level is increased.

In the ALC 39f, the RF detector 3
Upon receiving the DC voltage from 9d, a control signal for adjusting the amount of attenuation is input to the variable attenuator 39a. Here, the amount of attenuation is such that a value obtained by adding the ALC control voltage and the D / U ratio control voltage can secure a required D / U ratio in the antenna 39j. On the other hand, in the receiving system, the radio signal transmitted by the opposing hot standby type transmitting / receiving device 25 is received by the antenna 39j, and transmitted via the antenna duplexer 39i.
In the receiving unit 36, a detection process is performed. That is, in the third bandpass filter 36a, the attenuation transmitting unit 39
The band of the received signal from the antenna duplexer 39i is limited, the low-noise amplifier 36b amplifies the received RF signal at the output of the third bandpass filter 36a with low noise, and the low-noise amplifier 36b outputs Is multiplied by the local frequency from the local oscillator 36c, down-converted and an IF signal is output. Then, in the reception IF band filter 36e, an IF signal is extracted from the signal at the output of the reception mixer 36d, and is received in the second buffer 36f.
The IF signal at the output of the band filter 36e is amplified again, and the cable multiplexer 34a
Is input to

By providing such a receiving unit 36, a stable line can be established regardless of switching to the first transmitting / receiving unit 27 or the second transmitting / receiving unit 28 in the ODU 26 in the opposing hot standby type transmitting / receiving device 25. Can be secured. With such a configuration, in the first transmission / reception unit 50 of the working system, the transmission signal is input from the IDU 21, and the upper transmission band signal is not attenuated in the attenuation transmitter 39 or receives a slight power adjustment, and Sent from

On the other hand, in the second transmission / reception unit 51 of the standby system, the transmission signal is input from the IDU 21, but the control signal from the switching control section 21a is input so as to suppress the upper band signal. , In the attenuation transmitter 39,
The upper band signal is attenuated and is not transmitted from the antenna. That is, the IF signal is greatly attenuated by the variable attenuator 39a. The upper band signal obtained by up-converting the IF signal to the RF band is amplified by the RF power amplifier 39d, but the RF switch 39g operating in cooperation with the variable attenuator 39a is turned off. Therefore, the antenna 39j enters a standby state without being introduced. Therefore, the transmission wave is suppressed to the required D / U ratio in the antenna 39j.

In this case, the RF power amplifier 39d
At the output of the ALC 39f so that the transmission level matches the specifications of the wireless propagation path 30.
Receives feedback control. That is, a level corresponding to the standard output level is obtained for each of the image sideband levels of both units, and there is no change in the level diagram of the subsequent stage, and a stable detection voltage is obtained.

The transmitting / receiving unit selection method is as follows. First, in the switching control unit 21a in the IDU 21, the DC signal of the RF detector 39e coming from one of the pair of transmitting / receiving units is compared with the DC signal coming from the other transmitting / receiving unit. Be compared. Then, the control unit 21a sets, for example, the first transmitting / receiving unit 5 so that the level of the sideband on the main wave side becomes higher.
It controls the ALC 39f and the RF switch 39g within 0. As a result, the ALC 39f inputs a control signal to the variable attenuator 39a, and the active unit is selected. On the other hand, the switching control unit 21 a
1 for the ALC 39f and the RF switch 39g,
Since the control signal of the inverted logic is input, the ALC39f
Variable attenuator 39a
Sets a large amount of attenuation, and the signal is disconnected from the antenna also in the RF switch unit 39g. Thus, in this system, unit switching in a state where the required D / U ratio is secured is achieved.

Further, with such a configuration, in the receiving system, the received signal is processed by the first transmitting / receiving unit 50 of the working system and input to the IDU 21. At this time, by operating the receiving unit 36 in the second transmission / reception unit 51 of the standby system, the signal detected by the reception unit 36 is combined with the signal detected by the first transmission / reception unit 50 of the working system. Is input to the IDU 21 and this IDU
Within 21, it is also possible to select the received signals from both.

In the hot standby type transmitting / receiving device 48 of the hot standby type wireless system 31, the transmission signal input from the IDU 21 is transmitted from the first transmitting / receiving unit 50 of the active system to the wireless line 30,
The signal is transmitted to the opposite hot standby type transceiver 2
5 is received by the first transmission / reception unit 27 of the active system, and is transmitted to the outside via the IDU 29.

Here, for example, the first transmitting / receiving unit 50
When the device fails, the second transmission / reception unit 51 is switched to the active system, and the first transmission / reception unit 50 is switched to the standby system. That is, similarly to the above embodiments, the RF detector 3
When a DC voltage indicating a failure is input from the output of 9e to the control unit 21a of the IDU 21, an abnormality is detected, and a control signal whose logic is inverted is output from the control unit 21a instantly or at a required timing. , First transmitting / receiving unit 5
0 for the ALC 39f and the RF switching unit 39g of the second transmitting / receiving unit 51,
The control signals having opposite logics are switched, and the working system and the standby system are switched without the line being cut off. Further, the opposing hot standby type transmission device 25 performs the same operation.

As described above, in this embodiment, the RF switch 39g at the last stage and the variable attenuator 39a at the IF stage are combined, and the total attenuation is adjusted by the sum of these attenuations, so that the number of element stages is large. It can be composed of members that are cheaper than the RF switch, can flexibly cope with fluctuations in attenuation, and can follow the modulation method of other systems with different specifications, so that the device can be generalized. There is an advantage. Since a simple RF switch, which is not a multistage, is used in the last stage of transmission, it is possible to reduce deterioration such as distortion and insertion loss, and to promote power consumption and cost reduction. In this case, a high-attenuation RF switch is not required, and unnecessary amplification is not performed. Therefore, if the transmission outputs are at the same level, the amplifier design conditions can be relaxed. Further, A added to the RF power amplifier 39d
Since the LC 39f operates to set the selected high sideband to a predetermined level, the DC voltage level of the RF detector 39e is stably maintained even if either the upper sideband or the lower sideband is selected. As a result, the status of the active system and the standby system can be monitored, so that there is an advantage that the reliability of the system is improved.

For example, when the required D / U ratio is ≦ 40 dB and the attenuation of the final-stage RF switch 39g is 20 dB, the required attenuation of the variable attenuator 39a in the IF stage is ≦ 20 dB.
On the other hand, when the coupling coefficient is set to ≦ 20 dB in consideration of the coupling amount that is not affected by the RF detector 39e, the output level of the final-stage RF power amplifier 39g is +10 dBm. Here, the minimum detection level at which the monitor voltage can be detected by the RF detector 39e is set to -10 dBm. Therefore, assuming these conditions, the output at the IF stage is +30 dB.
If it is about m or more, it becomes practical.

(E) Description of the Fifth Embodiment of the Present Invention In this embodiment, the amount of attenuation is satisfied by the sum of the amount of attenuation by image switching of the image cancel mixer and the amount of attenuation by the IF stage variable attenuator. The monitor voltage of the output of the final-stage power amplifier can be detected depending on the attenuation level.

FIG. 14 is a detailed view of a hot standby type transmitting / receiving apparatus 52 according to the fifth embodiment of the present invention. The hot standby type transmission / reception apparatus 52 shown in FIG. 14 includes an IDU 21 for switching, monitoring and modulating / demodulating a line, and an RF
It comprises an ODU 53 composed of a first transmitting / receiving unit 54 and a second transmitting / receiving unit 55 for performing signal transmission / reception processing.

In this embodiment, for convenience of explanation, the upper band is used as the transmission frequency and the first transmitting / receiving unit 5 is used.
4 will be described as an active system, and the second transmitting / receiving unit 55 as a standby system. Hereinafter, the configuration of the hot standby type transmitting / receiving device 52 in the hot standby type wireless system 31 to which the present invention is applied will be described in detail. As shown in FIG. The configuration of the 27 and the second transmission / reception unit 28 is the same as that of the first transmission / reception unit 54 and the second transmission / reception unit 55, and thus redundant description will be omitted.

Here, the first transmitting / receiving unit 54 and the second transmitting / receiving unit 55 are both
In addition to the transmission post-stage unit 35 and the reception unit 36, the transmission unit 35 includes a sideband selection output unit 93. The sideband selection output unit 93 attenuates the transmission signal power in the IF band by a variable attenuator, and further attenuates the signal by image switching of an image cancel mixer in cooperation with the variable attenuator. , Variable attenuator 93
a, an image cancel mixer 32, a first band rejection filter 93b, an RF power amplifier 93c, and a fourth band filter 93d.

That is, the ODU 53 of the hot standby type transmitting / receiving apparatus 52 includes a variable attenuator 93a for attenuating an IF signal, frequency-converting the IF signal from the variable attenuator 93a into an RF signal, and an upper band of the RF signal. Canceling mixer 32 that performs upper-sideband signal / lower-sideband signal power adjustment type frequency conversion for reducing the signal power of either the wave signal or the lower sideband signal, and amplifies the RF signal from the image canceling mixer 32. RF
A pair of transmission systems including a power amplifier 93c and a second bandpass filter 93d for passing a sideband signal corresponding to the current transmission frequency with respect to the RF signal amplified by the RF power amplifier 93c, ie, a first transmission / reception unit 5
4 and the second transmission / reception unit 55, one of the transmission systems is configured as an active transmission system, and the other transmission system is configured as an amplifier-activated backup transmission system.

Then, these first transmitting / receiving units 54
And the second transmission / reception unit 55 include an intermediate frequency signal branching unit 67 that the image cancel mixer 32 divides the IF signal into two systems and adjusts the phase of one of the branched IF signals. By performing frequency conversion using the required local signal, R
An RF signal is output by performing frequency conversion using a first frequency conversion unit 32c that outputs an F signal and a local signal having a phase different from the local signal used for the IF signal in the first frequency conversion unit 32c. A second frequency conversion unit 32d, an intermediate frequency switching unit 33 that inputs two IF signals from the intermediate frequency signal branching unit 67 to the first frequency conversion unit 32c or the second frequency conversion unit 32d,
The above-mentioned first frequency converter 32c and second frequency converter 3
It is configured to include a combiner 32f that combines the outputs of 2d and outputs the combined output to the RF power amplifier 93c.

In FIG. 14, members denoted by the same reference numerals as those used in each of the above embodiments have the same or similar functions, and further description will be omitted. The signal flow of the transmission system is as follows. That is, in the variable attenuator 93a in the sideband selection output unit 93, the IF signal is attenuated by a required amount of attenuation, and in the in-phase hybrid device 32a in the image cancel mixer 32, the I signal from the variable attenuator 93a is
The F signal is branched into two systems, the phase of the IF signal from the in-phase hybrid device 32a is shifted by 90 degrees in the 90 ° phase shifter 32b, and only one of the upper band wave and the lower band wave is The signals are selected and output, and in the first frequency converters 32c and 32d, the carrier at the output of the local oscillator and the signal obtained by shifting the carrier by 90 degrees in the 90 ° phase shifter 32e are multiplied and up-converted to the RF band. Are combined at the combiner 32f. Then, the signal at the output of the image cancellation mixer 32 is subjected to a first band rejection filter 93b from which local leaks are removed, and an RF power amplifier 93
In c, the sideband signal on the side selected and output from the image cancellation mixer 32 is amplified, the transmission band is limited in the second bandpass filter 93d, and the signal is passed through the antenna duplexer 35e in the transmission post-stage unit 35. The upper band signal from fourth band filter 93d is introduced into antenna 35f and transmitted.

The transmission signal power-amplified by the RF power amplifier 93c in the sideband selection output section 93 is monitored by the RF detector 35b in the post-transmission section 35. The result is that ALC 35c and I
The status is constantly monitored so that the feedback input to the DU 21 is compared with the other detection information, the system suitable for the active system is selected, and the attenuation control is performed so as to increase the transmission level. Then, the D / U ratio necessary for the antenna is obtained with the total attenuation, and at the same time, a level detectable by the RF detector is ensured.

In the ALC 35c, the RF
In response to the DC voltage from the detector 35b, a control signal for adjusting the amount of attenuation is supplied to the variable attenuator 9 in the sideband selection output unit 93.
3a. Here, the attenuation amount is a value such that a value obtained by adding the ALC control voltage and the D / U ratio control voltage can secure a required D / U ratio in the antenna 35f. The control signal indicating the amount of attenuation is at a level at which a required D / U ratio can be secured in the antenna 35f by adding the D / U ratio control voltage to the ALC control voltage.

On the other hand, the receiving system transmits the radio signal transmitted by the opposite hot standby type transmitting / receiving device 25 to the antenna 3.
The signal is received at 5f, and is subjected to detection processing at the receiving unit 36 via the antenna duplexer 35e. That is, in the third bandpass filter 36a, the band of the reception signal from the antenna duplexer 35e in the transmission post-stage unit 35 is limited,
In the low noise amplifier 36b, the third bandpass filter 36a
Is amplified with low noise, and the signal from the low-noise amplifier 36b is multiplied by the local frequency from the local oscillator 36c in the reception mixer 36d, down-converted and the IF signal is output. Then, in the reception IF band filter 36e, an IF signal is extracted from the signal at the output of the reception mixer 36d, and the IF signal at the output of the reception IF band filter 36e is again amplified in the second buffer 36f. The signal is input to the cable multiplexer 34a.

With such a configuration, in the first transmission / reception unit 54 of the active system, the transmission signal is input from the IDU 21, and the upper band signal is not attenuated or slightly adjusted in the side band selection output unit 93. Then, it is transmitted from the antenna as a main wave. Then, the signal is introduced into the antenna 35f as a main wave via the fourth band filter 93d.

On the other hand, in the second transmission / reception unit 55 of the standby system, the transmission signal is input from the IDU 21, but the control signal from the switching control section 21a is input so as to suppress the upper band signal. , Sideband selection output section 93
In this case, the upper band signal is attenuated and is not transmitted from the antenna. That is, the IF signal is
a, the variable attenuator 93a
The upper band signal is suppressed by the sum of the amounts of attenuation, and is put into a standby state without being transmitted from the antenna 35f. That is, the antenna 35f
In, the transmission wave is suppressed to a required D / U ratio.

In this case, the RF power amplifier 93c
At the output of the ALC 35c so that the transmission level matches the specifications of the wireless propagation path 30.
Receives feedback control. That is, each of the selected sideband levels of both units has a level corresponding to the standard output level, and there is no change in the level diagram of the subsequent stage, and a stable detection voltage can be obtained.

The transmission / reception unit selection method is as follows. First, in the switching control unit 21a in the IDU 21, the DC signal of the RF detector 35b coming from one of the pair of transmission / reception units is compared with the DC signal coming from the other transmission / reception unit. Be compared. Then, the control unit 21a sets, for example, the first transmitting / receiving unit 5 so that the level of the sideband on the main wave side becomes higher.
4 and the intermediate frequency switching unit 33 of the image cancel mixer 32. As a result, the ALC 35c inputs a control signal to the variable attenuator 93a, and the active unit is selected. On the other hand, the switching control unit 21a sets the ALC 35c in the second transmitting / receiving unit 55
And intermediate frequency switching unit 3 of image cancel mixer 32
3, the variable attenuator 93a sets the amount of attenuation to be large by the control signal input from the ALC 35c. Thus, in this system, unit switching in a state where the required D / U ratio is secured is achieved.

Further, with such a configuration, in the receiving system, the received signal is processed by the first transmitting / receiving unit 54 of the working system and input to the IDU 21. At this time, by operating the receiving unit 36 also in the second transmission / reception unit 55 of the standby system, the signal detected by the reception unit 36 is combined with the signal detected by the first transmission / reception unit 54 of the working system. Is input to the IDU 21 and this IDU
Within 21, it is also possible to select the received signals from both.

In the hot standby transmission / reception device 52 of the wireless system 31 of the hot standby system,
The transmission signal input from the DU 21 is transmitted from the first transmission / reception unit 54 of the active system to the wireless line 30, and the signal is received by the first transmission / reception unit 27 of the active system in the opposing hot standby type transmission / reception device 25. And I
The data is transmitted to the outside via the DU 29.

When the first transmitting / receiving unit 54 breaks down, for example, a signal is transmitted from the second transmitting / receiving unit 55 as the active system, and the first transmitting / receiving unit 54 is switched in the same manner as in the above embodiment so as to be the standby system. Done. That is, when a DC voltage indicating a failure is input from the output of the RF detector 35b to the control unit 21a of the IDU 21, an abnormality is detected, and the logic is inverted from the control unit 21a instantly or at a required timing. The control signal is output,
A control signal is input to both the ALC 35c and the intermediate frequency switching unit 33 of the image cancel mixer 32 included in the sideband selection and output unit 93 in the first transmission / reception unit 54, and the second transmission / reception unit 55, the control signal of the opposite logic is applied to both the ALC 35c and the intermediate frequency switching unit 33 of the image cancel mixer 32 constituting the sideband selection unit 93, and the line is cut off. No, the working system and the standby system are switched. Further, the opposing hot standby type transmission device 25
A similar operation is performed.

As described above, in the present embodiment, by combining the image cancellation mixer 32 and the variable attenuator 93a in the IF stage, the required D / U ratio at the antenna 35f can be reduced by the amount of attenuation by switching the image of the image cancellation mixer 32. Since it is set to satisfy the sum of the attenuation amount of the IF stage variable attenuator 93a and the expensive RF switch,
A required amount of attenuation can be obtained, and cost reduction can be promoted. Further, since no RF switch is provided at the final stage of transmission, there is an advantage that deterioration such as distortion and insertion loss can be reduced, and power consumption can be reduced. Since a high-attenuation RF switch is not required and unnecessary amplification is not performed, the design conditions of the amplifier can be eased if the transmission output is at the same level. Furthermore, since it is possible to flexibly cope with fluctuations in the amount of attenuation and follow modulation systems of other systems having different specifications, there is an advantage that the device can be used for general purposes. Further, since the ALC 35c added to the RF power amplifier 93c operates to set the selected high sideband to a predetermined level, even if any of the upper sideband and the lower sideband is selected, RF Since the DC voltage level of the detector 35b can be obtained stably and the status of the working system and the standby system can be monitored, there is an advantage that the reliability of the system is improved.

For example, when the required D / U ratio is ≦ 93 dB and the attenuation of the image cancel mixer 32 is 20 dB,
The required attenuation of the IF stage variable attenuator 93a is ≤20 dB. On the other hand, when the coupling coefficient is set to ≦ 20 dB in consideration of the coupling amount not affected by the RF detector 35b, the output level of the final-stage RF power amplifier 93c is +10 dBm.
Here, the lowest detection level at which the monitor voltage can be detected by the RF detector 35b is -10 dBm. Therefore, assuming these conditions, the output at the IF stage is +30 dB.
If it is about m or more, it becomes practical.

(E1) Description of a First Modification of the Fifth Embodiment of the Present Invention The upper band signal / lower band signal power adjusting type frequency converter in the fifth embodiment is replaced with an image cancel mixer. Composed of a sideband selector and combined with an IF stage variable attenuator so that the required D / U ratio at the antenna is satisfied by the sum of the attenuation of the sideband selector and the attenuation of the IF stage variable attenuator. It can also be configured.

FIG. 15 is a detailed view of a hot standby type transceiver 56 according to a first modification of the fifth embodiment of the present invention. The hot standby transmission / reception device 56 shown in FIG. 15 includes an IDU 21 for control, and an ODU 57 including a first transmission / reception unit 58 and a second transmission / reception unit 59 for performing transmission / reception processing of an RF signal.
In this modification, for convenience of explanation, the upper band is used as the transmission frequency, the first transmission / reception unit 58 is used as the active system, and the second transmission / reception unit 59 is used as the standby system.
Hereinafter, the configuration of the hot standby type transmitting / receiving device 56 in the hot standby type wireless system 31 to which the present invention is applied will be described in detail. As shown in FIG. 2
7 and the second transmission / reception unit 28 also have the same configuration as the first transmission / reception unit 58 and the second transmission / reception unit 5.
9, and a duplicate description thereof will be omitted.

Here, each of the first transmission / reception unit 58 and the second transmission / reception unit 59 includes the transmission pre-stage unit 34,
In addition to a transmission post-stage unit 35 and a reception unit 36, a sideband selection output unit 94 is provided. The sideband selection output section 94 attenuates the transmission signal power by the variable attenuator in the IF band, and further attenuates the transmission signal power by the sideband selection section. A ratio is obtained, and a level that can be detected by the RF detector is ensured. The RF detector includes a variable attenuator 94a, a sideband selector 37, an RF power amplifier 94b, and a second bandpass filter 94c. I have.

That is, the ODU 57 of the hot standby transmission / reception device 56 includes a variable attenuator 94a for attenuating the IF signal, converts the frequency of the IF signal from the variable attenuator 94a to an RF signal, and simultaneously converts the upper band of the RF signal. And a lower band signal for reducing the signal power of either the wave signal or the lower band signal. A sideband selector 37 for performing power conversion type frequency conversion, and an RF signal from the sideband selector 37 A pair of a transmission system including an RF power amplifier 94b for amplification and a second bandpass filter 94c for passing a sideband signal corresponding to the current transmission frequency with respect to the RF signal amplified by the RF power amplifier 94b, First transmitting / receiving unit 58 and second transmitting / receiving unit 5
9, one of the transmission systems is configured as an active transmission system, and the other transmission system is configured as an amplifier-activated backup transmission system.

Then, these first transmitting / receiving units 58
And the second transmission / reception unit 59 are connected to the sideband selector 37.
Is a frequency converter 37a that outputs an RF signal by subjecting the IF signal to frequency conversion using a required local signal, a first bandpass filter 37c that passes an upper band signal of the RF signal, Bandpass filter 37c
A second band-pass filter 37d provided in parallel with the first band-pass filter and passing the lower band wave signal of the RF signal, and a signal band provided upstream or downstream of the first band-pass filter 37c and the second band-pass filter 37d. RF switching unit 37 for switching the road
b.

In FIG. 15, members denoted by the same reference numerals as those used in the above embodiments have the same or similar functions, and further description will be omitted. Focusing only on the signal flow of the transmission system, the following is obtained. That is, in the variable attenuator 94a, the IF signal is attenuated by a required amount of attenuation, and in the frequency converter 37a in the sideband selector 37, the attenuated IF signal is up-converted to the RF band, and 37b, the frequency converter 37a
Is output to one of two paths. Then, in the first band filter 37c, only the upper band wave is selected from the RF signals from the RF switching unit 37b.
a second bandpass filter 3 provided in parallel with c
In 7d, only the lower sideband is selected from the RF signals from the RF switching unit 37b.
After the signals from the first bandpass filter 37c and the second bandpass filter 37d are returned to one system, the RF power amplifier 94b
, The transmission power is amplified and the second bandpass filter 94c
, The transmission band is limited, and the second bandpass filter 9e is transmitted through the antenna duplexer 35e in the transmission post-stage unit 35.
The upper band signal from 4c is introduced into antenna 35f and transmitted.

The transmission signal power-amplified by the RF power amplifier 94b is monitored by the RF detector 35b. The result is ALC35 at DC voltage.
c and the IDU 21 are fed back and compared with the other detection information, a system suitable for the working system is selected, and the state is constantly monitored so that attenuation control is performed so as to increase the transmission level.

With such a configuration, in the first transmission / reception unit 58 of the active system, the transmission signal is input from the IDU 21 and the upper band signal is not attenuated or slightly adjusted in the side band selection output section 94. And transmitted from the antenna. On the other hand, in the second transmission / reception unit 59 of the standby system, the transmission signal is input from the IDU 21, but the control signal from the switching control unit 21 a is input so as to suppress the upper band signal. In the selection output unit 94, the upper band signal is attenuated and is not transmitted from the antenna.

In this case, the RF power amplifier 94b
At the output of the ALC 35c so that the transmission level matches the specifications of the wireless propagation path 30.
Receives feedback control. That is, each of the selected sideband levels of both units has a level corresponding to the standard output level, and there is no change in the level diagram of the subsequent stage, and a stable detection voltage can be obtained.

[0172] The transmission / reception unit selection method is as follows. First, in the switching control unit 21a in the IDU 21, the DC signal of the RF detector 35b coming from one of the pair of transmission / reception units is compared with the DC signal coming from the other transmission / reception unit. Be compared. Then, the control unit 21a sets, for example, the first transmitting / receiving unit 5 so that the level of the sideband on the main wave side becomes higher.
8 and the RF switching unit 3 of the sideband selecting unit 37
7b is controlled. Thereby, this ALC35
As for c, the control signal is input to the variable attenuator 94a, so that the working unit is selected. On the other hand, the switching control unit 21a
Since the control signal of the inverted logic is input to the ALC 35c in the second transmitting / receiving unit 59 and the RF switching unit 37b of the sideband selector 37, the control signal input from the ALC 35c causes the variable attenuator 94a to attenuate the attenuation. Set a large amount. Thus, in this system, unit switching in a state where the required D / U ratio is secured is achieved.

Further, with such a configuration, in the receiving system, the received signal is processed by the first transmitting / receiving unit 58 of the working system and input to the IDU 21. At this time, by operating the receiving unit 36 also in the second transmission / reception unit 59 of the standby system, the signal detected by the reception unit 36 is combined with the signal detected by the first transmission / reception unit 58 of the working system. Is input to the IDU 21 and this IDU
Within 21, it is also possible to select the received signals from both.

In the hot standby type transmitting / receiving device 56 of the hot standby type radio system 31,
The transmission signal input from the DU 21 is transmitted from the first transmission / reception unit 58 of the active system to the wireless line 30, and the signal is received by the first transmission / reception unit 27 of the active system in the opposing hot standby type transmission / reception device 25. And I
The data is transmitted to the outside via the DU 29.

Here, for example, when the first transmission / reception unit 58 fails, a signal is transmitted from the second transmission / reception unit 59 as the active system, and the first transmission / reception unit 58 is switched in the same manner as in the above embodiment so as to be the standby system. Done. That is, when a DC voltage indicating a failure is input from the output of the RF detector 35b to the control unit 21a of the IDU 21, an abnormality is detected, and the logic is inverted from the control unit 21a instantly or at a required timing. The control signal is output,
The ALC 35c in the first transmission / reception unit 58 and the RF of the sideband selection unit 37 constituting the sideband selection output unit 94
The control signal is input to both the switching unit 37b and the ALC3 in the second transmitting / receiving unit 59.
5c and the RF switching unit 37b of the sideband selection unit 37 constituting the sideband selection output unit 94, a control signal of the opposite logic is applied to the sideband selection unit 37. The spare system is replaced. Further, the opposing hot standby type transmission device 25 performs the same operation.

As described above, in the present modification, the sideband selector 3
7 is combined with the IF stage variable attenuator 94a so that the sum of the attenuation of the sideband selector 37 and the attenuation of the IF stage variable attenuator 94a satisfies the required D / U ratio at the antenna; Since the monitor voltage of the output of the final stage power amplifier can be detected, the same effect as in the fifth embodiment can be obtained.

That is, the sideband wave can be dynamically switched. Further, since no RF switch is provided at the final stage of transmission, there is an advantage that deterioration such as distortion and insertion loss can be reduced, and power consumption can be reduced. And
Since a high-attenuation RF switch is not required and unnecessary amplification is not performed, the design conditions of the amplifier can be eased if the transmission output is at the same level. Furthermore, since it is possible to flexibly cope with fluctuations in the amount of attenuation and follow modulation systems of other systems having different specifications, there is an advantage that the device can be used for general purposes. In addition, since the ALC 35c added to the RF power amplifier 94b operates to set the selected high sideband to a predetermined level, even if any of the upper sideband and the lower sideband is selected, the RF is not changed. Since the DC voltage level of the detector 41b can be obtained stably and the status of the working system and the standby system can be monitored, there is an advantage that the reliability of the system is improved.

For example, if the required D / U ratio is ≦ 40 dB and the amount of attenuation of the main wave due to image switching is 20 dB, the IF
The required attenuation of the variable attenuator 94a of the stage is ≦ 20 dB. On the other hand, when the coupling coefficient is set to ≦ 20 dB in consideration of the coupling amount that is not affected by the RF detector 35b, the output level of the final-stage RF power amplifier 94b is +10 dBm.
Here, the lowest detection level at which the monitor voltage can be detected by the RF detector 35b is -10 dBm. Therefore, assuming these conditions, the output at the IF stage is +30 dB.
If it is about m or more, it becomes practical.

(E2) Description of the Second Modification of the Fifth Embodiment of the Present Invention The upper band signal / lower band signal power adjusting frequency in the above fifth embodiment and the first modification of the fifth embodiment. The conversion unit may be configured by connecting the image cancellation mixer and the sideband selection unit. FIG. 16 shows a detailed view of a hot standby type transceiver 60 according to a second modification of the fifth embodiment of the present invention. The hot standby transmission / reception device 60 shown in FIG.
A first transmission / reception unit 62 for performing transmission / reception processing of the F signal,
An ODU 61 including a second transmission / reception unit 63 is provided.

In this modification, for convenience of explanation, the upper band is used as the transmission frequency and the first transmitting / receiving unit 6 is used.
2 will be described as an active system, and the second transmission / reception unit 63 will be described as a standby system. Hereinafter, the configuration of the hot standby type transmitting / receiving device 60 in the hot standby type wireless system 31 to which the present invention is applied will be described in detail. As shown in FIG. The configuration of the 27 and the second transmission / reception unit 28 is the same as that of the first transmission / reception unit 62 and the second transmission / reception unit 63, and thus redundant description thereof will be omitted.

Here, each of the first transmitting / receiving unit 62 and the second transmitting / receiving unit 63 includes the above-described transmission pre-stage unit 34,
In addition to a transmission post-stage unit 35 and a reception unit 36, a sideband selection output unit 95 is provided. The sideband selection output unit 95 determines the D / D required for the antenna in the IF band based on the total attenuation of the transmission signal power in three stages: attenuation by the variable attenuator, attenuation by the image cancel mixer, and attenuation by the sideband selection unit. U ratio is obtained, and R
To ensure a level that the F detector can detect,
It comprises a variable attenuator 95a, a sideband selector 38, an RF power amplifier 95b, and a fourth bandpass filter 95c.

That is, the ODU 61 of the hot standby type transmission / reception apparatus 60 includes a variable attenuator 95a for attenuating an IF signal, frequency-converting the IF signal from the variable attenuator 95a into an RF signal, and an upper band of the RF signal. Side band selecting section 38 for performing an upper band signal / lower band signal power adjustment type frequency conversion for reducing the signal power of either the wave signal or the lower band signal, and this side band selecting section 38
Power amplifier 95b for amplifying the RF signal from the RF power amplifier 95b, and a second bandpass signal for passing the sideband signal corresponding to the current transmission frequency for the RF signal amplified by the RF power amplifier 95b.
A pair of transmission systems including a bandpass filter 95c, that is, a first transmission / reception unit 62 and a second transmission / reception unit 63 are provided. One transmission system is configured as a working transmission system, and the other transmission system is an amplifier. It is configured as an active backup transmission system.

The first transmitting / receiving unit 62
And the second transmission / reception unit 63 include the sideband selection unit 38
However, by splitting the IF signal into two systems and performing phase adjustment on one of the branched IF signals, and performing frequency conversion using the required local signal for the IF signal, An RF signal is output by performing frequency conversion using a first frequency converter 38c that outputs an RF signal and a local signal having a different phase from the local signal used in the first frequency converter 38c for the IF signal. The two frequency IF signals from the second frequency conversion unit 38d and the intermediate frequency signal branching unit 68 are converted into the first frequency conversion unit 38c or the second frequency conversion unit 38.
d, an intermediate frequency switching unit 33, an output of the first frequency conversion unit 38c, and a first multiplexing unit 38f that multiplexes and outputs the outputs of the second frequency conversion unit 38d.
A first bandpass filter 38h that allows the upper bandpass signal of the RF signal from 8f to pass therethrough, and a lower bandpass signal that is provided in parallel with the first bandpass filter 38h and is RF signal from the first multiplexing unit 38f. The second bandpass filter 38i to be passed
And an RF switching unit 38g provided upstream or downstream of the first band-pass filter 38h and the second band-pass filter 38i to switch the signal path.

In FIG. 16, members denoted by the same reference numerals as those used in each of the above embodiments have the same or similar functions, and further description will be omitted. If attention is paid only to the signal flow of the transmission system, the following is obtained. That is, in the variable attenuator 95a, the IF signal is attenuated by a required amount of attenuation, and the intermediate frequency signal branching unit 6 in the sideband selecting unit 38
8, the IF signal from the variable attenuator 95a is branched into two systems, and the 90 ° phase shifter 38b outputs the IF signal from the in-phase hybrid 38a.
The F signal is shifted in phase by 90 degrees, and the intermediate frequency switching unit 3
In 3, only one of the upper band wave and the lower band wave is selectively output. The signal output from the intermediate frequency switching unit 33 is multiplied by the carrier signal output from the local oscillator 36c in the first frequency conversion unit 38c, and the carrier signal is converted by 90 ° in the second frequency conversion unit 38d. The signal is multiplied by the signal shifted by 90 degrees in the phase shifter 38e, up-converted to the RF band, and multiplexed in the first multiplexing unit 38f. Then, the signal in which the power of only the lower sideband signal at the output of the first multiplexing unit 38f is attenuated is guided to one of two paths in the RF switching unit 38g, and matches the upper sideband. Either passes through a first bandpass filter 38h having pass characteristics or a second bandpass filter 38i having pass characteristics matching the lower band wave
Is selected, and in the second multiplexing unit 38j,
The signal from the first band filter 38h or the second band filter 38i is returned to one system.

Then, in the RF power amplifier 95b,
The transmission power is amplified, and in the fourth bandpass filter 95c,
The transmission band is limited, and the upper band signal from the second bandpass filter 95c is introduced into the antenna 35f and transmitted through the antenna duplexer 35e in the transmission post-stage unit 35. The transmission signal that has been power-amplified by the RF power amplifier 95b is monitored by the RF detector 35b. The result is that ALC 35c and I
The feedback is input to the DU 21 and compared with the other detection information, a system suitable for the working system is selected, and the state is constantly monitored so that the attenuation control is performed so that the transmission level is increased.

With such a configuration, in the first transmission / reception unit 62 of the active system, the transmission signal is input from the IDU 21, and the upper band signal is not attenuated or slightly adjusted in the side band selection output section 95. And transmitted from the antenna. On the other hand, in the second transmission / reception unit 63 of the standby system, the transmission signal is input from the IDU 21, but the control signal from the switching control unit 21a is input so as to suppress the upper band signal, so that the side band In the selection output unit 95, the upper band signal is attenuated and is not transmitted from the antenna.

In this case, the RF power amplifier 95b
At the output of the ALC 35c so that the transmission level matches the specifications of the wireless propagation path 30.
Receives feedback control. That is, each of the selected sideband levels of both units has a level corresponding to the standard output level, and there is no change in the level diagram of the subsequent stage, and a stable detection voltage can be obtained.

[0188] The transmission / reception unit selection method is as follows. First, in the switching control unit 21a in the IDU 21, the DC signal of the RF detector 35b coming from one of the pair of transmission / reception units is compared with the DC signal coming from the other transmission / reception unit. Be compared. Then, the control unit 21a sets, for example, the first transmitting / receiving unit 6 so that the level of the sideband wave on the main wave side becomes higher.
2, the ALC 35c, the intermediate frequency switch 33 of the sideband selector 38, and the RF switch 38g of the sideband selector 38 are controlled. As a result, the ALC 35c inputs a control signal to the variable attenuator 95a, and the working unit is selected. On the other hand, the switching control unit 21a inputs an inverted logic control signal to the ALC 35c in the second transmitting / receiving unit 63, the intermediate frequency switching unit 33 of the sideband selection unit 38, and the RF switching unit 38g of the sideband selection unit 38. So this AL
The variable attenuator 95a sets the amount of attenuation to be large by the control signal input from C35c. Thus, in this system, unit switching in a state where the required D / U ratio is secured is achieved.

Further, in such a configuration, in the receiving system, the received signal is processed by the first transmitting / receiving unit 62 of the working system and input to the IDU 21. At this time, by operating the receiving unit 36 also in the second transmitting / receiving unit 63 of the standby system, the signal detected by the receiving unit 36 is combined with the signal detected by the first transmitting / receiving unit 62 of the working system. Is input to the IDU 21 and this IDU
Within 21, it is also possible to select the received signals from both.

In the hot standby transmission / reception device 60 of the hot standby wireless system 31,
The transmission signal input from the DU 21 is transmitted from the first transmission / reception unit 62 of the active system to the wireless line 30, and the signal is received by the first transmission / reception unit 27 of the active system in the opposing hot standby type transmission / reception device 25. And I
The data is transmitted to the outside via the DU 29.

Here, for example, the first transmission / reception unit 62
Of the second transmission / reception unit 63
, And the first transmission / reception unit 62 is switched in the same manner as in the above embodiment so as to be a standby system.
That is, a DC indicating a failure is obtained from the output of the RF detector 35b.
When the voltage is input to the control unit 21a of the IDU 21, an abnormality is detected, and a control signal whose logic is inverted is output from the control unit 21a instantaneously or at a required timing. ALC35c,
The intermediate frequency switching unit 33 of the sideband selection unit 38 constituting the sideband selection output unit 95, and the RF switching unit 3 of the sideband selection unit 38
A control signal is input to three of 8g,
The ALC 35c, the intermediate frequency switching unit 33 of the sideband selection unit 38 constituting the sideband selection output unit 95, and the RF switching unit 38g of the sideband selection unit 38, which are included in the second transmission / reception unit 59.
The control signal of the opposite logic is added to the three, and the working system and the protection system are switched without disconnecting the line.
Further, the opposing hot standby type transmission device 25 performs the same operation.

As described above, in this modification, the required D in the antenna is the sum of the amount of attenuation due to image switching in the image cancel mixer 32, the amount of attenuation by the sideband selector, and the amount of attenuation of the variable attenuator 95a in the IF stage. Since the / U ratio is satisfied and the monitor voltage of the output of the final stage power amplifier can be detected, the same effect as in the fifth embodiment can be obtained, and a large amount of attenuation can be obtained. be able to.

The required attenuation can be obtained without using an expensive RF switch, and cost reduction can be promoted. Further, since no RF switch is provided at the final stage of transmission, there is an advantage that deterioration such as distortion and insertion loss can be reduced, and power consumption can be reduced. Since a high-attenuation RF switch is not required and unnecessary amplification is not performed, the design conditions of the amplifier can be eased if the transmission output is at the same level. Furthermore, since it is possible to flexibly cope with fluctuations in the amount of attenuation and follow modulation systems of other systems having different specifications, there is an advantage that the device can be generalized, and a large amount of attenuation can be obtained. . ALC3 added to the RF power amplifier 95b
5c operates to set the selected high sideband to a predetermined level, so that the DC voltage level of the RF detector 35b is stable even if either the upper sideband or the lower sideband is selected. As a result, the status of the active system and the standby system can be monitored, so that there is an advantage that the reliability of the system is improved.

(F) Others The circuit configuration of the sideband selector in each of the above embodiments can be variously modified and implemented without departing from the spirit of the present invention. FIG. 17B shows an example of an equivalent block diagram of the sideband selector 37. This FIG. 17 (b)
Is an example of an equivalent block diagram of the sideband selector 37 shown in FIG. 17A, in which the positions of an RF switching unit that switches two paths and a position of a bandpass filter are reversed. Therefore, each of the above embodiments can be configured even by using such an equivalent block circuit.

The sideband selecting section 65 includes the frequency converting section 6
5a, a demultiplexing unit 65b, a first bandpass filter 65c, a second bandpass filter 65d, and an RF switching unit 65e. In the frequency conversion unit 65a, the IF signal is up-converted into an RF signal, and in the demultiplexing unit 65b. The RF signal is branched into two, and only the upper band signal is selected from the RF signal in the first band filter 65c, and only the lower band signal is selected from the RF signal in the second band filter 65d. Is selected, and the first bandpass filter 65c or the second bandpass filter 65c is
A signal path from the bandpass filter 65d is connected to a subsequent stage.

That is, in the sideband selecting section 37 shown in FIG. 17A, the RF switching section 37b includes the first bandpass filter 37.
c and provided upstream of the second bandpass filter 37d,
The signal route is being switched. On the other hand, in the sideband selector 65 shown in FIG. 17B, the RF switching unit 65e is provided downstream of the first bandpass filter 65c and the second bandpass filter 65d, and the upper band signal and the lower band signal are provided. Of these, the signal path is switched so that only the upper band signal is output to the subsequent circuit.

Although the transmission-side band signal in each of the above-described embodiments has been limited to the upper-side band, it is also possible to use the lower-side band without departing from the scope of the present invention. In this case, it goes without saying that the transmission system is configured by the transmission characteristic of the transmission band filter that matches the lower band wave. Furthermore, in each of the embodiments described above, the number of RF switches constituting the image switching means is assumed to be one, but by using two, an additional attenuation of about 20 dB can be expected. In other words, the minimum detection level is increased by another 20
It is possible to configure to reduce dB.

[0198]

As described above in detail, according to the hot standby type transmitting apparatus of the present invention, the intermediate frequency signal is frequency-converted into a radio frequency signal, and the upper band of the radio frequency signal is converted. An upper band signal / lower band signal power adjustment type frequency converter for reducing the signal power of either the signal or the lower band signal, and a signal from the upper band signal / lower band signal power adjustment type frequency converter. A pair of a transmission system including an amplifier for amplifying the radio frequency signal and a filter for passing a sideband signal corresponding to a current transmission frequency with respect to the radio frequency signal amplified by the amplifier is provided. Since the transmission system is configured as an active transmission system and the other transmission system is configured as a backup transmission system of an amplifier active type, the sideband can be dynamically switched. Further, since an RF switch is not provided at the final stage of transmission, deterioration such as distortion and insertion loss can be reduced, and there is an advantage that power consumption can be reduced. Since a high-attenuation RF switch is not required and unnecessary amplification is not performed, the design conditions of the amplifier can be eased if the transmission output is at the same level. Furthermore, even if either the upper band or the lower band is selected, the DC voltage level of the automatic gain control circuit can be stably obtained, and the status of the working system and the standby system can be monitored. There is an advantage of improving the performance (claim 1).

The upper band signal / lower band signal power adjusting type frequency conversion section branches the intermediate frequency signal into two systems and adjusts the phase of one of the branched intermediate frequency signals. Unit, a first frequency conversion unit that outputs a radio frequency signal by performing frequency conversion using a required local signal for the intermediate frequency signal, and a local signal used in the first frequency conversion unit for the intermediate frequency signal. Is a second frequency conversion unit that outputs a radio frequency signal by performing frequency conversion using local signals having different phases, and converts the two intermediate frequency signals from the intermediate frequency signal branching unit into the first frequency signal. An intermediate frequency switching unit input to the conversion unit or the second frequency conversion unit; and an output of the first frequency conversion unit and the output of the second frequency conversion unit. It may be configured as an image canceling mixer having a multiplexing unit for outputting to the width unit. In this case, the sideband wave is dynamically switched without using a fixed element such as an expensive mechanical filter. And cost reduction can be promoted. Further, since no RF switch is provided at the final stage of transmission, there is an advantage that deterioration such as distortion and insertion loss can be reduced, and power consumption can be reduced. Since a high-attenuation RF switch is not required and unnecessary amplification is not performed, the design conditions of the amplifier can be eased if the transmission output is the same level.

The upper band signal / lower band signal power adjustment type frequency converter converts the intermediate frequency signal using a required local signal and outputs a radio frequency signal. A first filter that passes an upper band signal of the radio frequency signal; a second filter that is provided in parallel with the first filter and passes a lower band signal of the radio frequency signal; A sideband selection circuit may be provided upstream or downstream of the filter and the second filter, and having a switch unit for switching a signal path. In such a case, the sideband can be dynamically changed. It will be possible to switch. Further, since no RF switch is provided at the final stage of transmission, there is an advantage that deterioration such as distortion and insertion loss can be reduced, and power consumption can be reduced. Since a high-attenuation RF switch is not required and unnecessary amplification is not performed, the design conditions of the amplifier can be relaxed if the transmission output is at the same level.

Further, the upper band signal / lower band signal power adjustment type frequency converter divides the intermediate frequency signal into two systems and adjusts the phase of one of the branched intermediate frequency signals. A signal branching unit, a first frequency conversion unit that outputs a radio frequency signal by performing frequency conversion on the intermediate frequency signal using a required local signal, and a local frequency conversion unit that uses the intermediate frequency signal for the intermediate frequency signal. A second frequency conversion unit that outputs a radio frequency signal by performing frequency conversion using a local signal having a phase different from that of the signal, and the two intermediate frequency signals from the intermediate frequency signal branching unit. The intermediate frequency switching unit input to the one frequency conversion unit or the second frequency conversion unit, and the outputs of the first frequency conversion unit and the second frequency conversion unit are multiplexed. A multiplexing unit to be output, a first filter for passing an upper band signal of the radio frequency signal from the multiplexing unit, and the radio frequency signal from the multiplexing unit provided in parallel to the first filter. It may be configured as a sideband selection circuit having a second filter that allows the lower band signal of the signal to pass therethrough, and a switch unit that is provided upstream or downstream of the first filter and the second filter and that switches a signal path. By doing so, it is possible to lower the level higher by the sum of the attenuation by the sideband switching of the image cancel mixer and the attenuation by the sideband selector, so that the sideband can be dynamically switched. Become. Further, since no RF switch is provided at the final stage of transmission, there is an advantage that deterioration such as distortion and insertion loss can be reduced, and power consumption can be reduced. Since a high-attenuation RF switch is not required and unnecessary amplification is not performed, if the transmission output is at the same level, the design conditions of the amplifier can be relaxed (claim 4).

According to the hot standby type transmitting apparatus of the present invention, a variable attenuator for attenuating an intermediate frequency signal and a required local signal are used for the intermediate frequency signal from the variable attenuator. A frequency conversion unit that outputs a radio frequency signal by performing frequency conversion
An amplifier that amplifies the radio frequency signal from the frequency conversion unit, a radio frequency switch unit that passes or blocks the radio frequency signal amplified by the amplifier, and an amplifier that amplifies the radio frequency signal from the radio frequency switch unit. A pair of transmission systems including a filter for passing either the sideband signal or the lower sideband signal is provided, and one transmission system is configured as an active transmission system and the other transmission system is an amplifier active type. Since it is configured as a spare transmission system, it can flexibly cope with fluctuations in the amount of attenuation and can follow modulation systems of other systems having different specifications, so that there is an advantage that the device can be generalized. . Since a simple RF switch, which is not a multistage, is used in the last stage of transmission, it is possible to reduce deterioration such as distortion and insertion loss, and to promote power consumption and cost reduction. Also, since a high-attenuation RF switch is not required and unnecessary amplification is not performed, the design conditions of the amplifier can be relaxed if the transmission output is the same level.

Further, according to the hot standby type transmitting apparatus of the present invention, the variable attenuator for attenuating the intermediate frequency signal and the intermediate frequency signal from the variable attenuator are frequency-converted to a radio frequency signal. Both, an upper band signal / lower band signal power adjustment type frequency converter for reducing the signal power of either the upper band signal or the lower band signal of the radio frequency signal, and the upper band signal / lower band signal A transmission comprising an amplifier for amplifying the radio frequency signal from the wave signal power adjusting type frequency conversion unit, and a filter for passing the sideband signal corresponding to the current transmission frequency for the radio frequency signal amplified by the amplifier. Since one transmission system is provided and one transmission system is configured as a working transmission system, and the other transmission system is configured as a standby transmission system of an amplifier active type, Without using an RF switch, it will be able to obtain the required attenuation, can promote cost reduction. Further, since no RF switch is provided at the final stage of transmission, there is an advantage that deterioration such as distortion and insertion loss can be reduced, and power consumption can be reduced. Since a high-attenuation RF switch is not required and unnecessary amplification is not performed, the design conditions of the amplifier can be eased if the transmission output is at the same level. Furthermore, since it is possible to flexibly cope with fluctuations in the amount of attenuation and to follow modulation systems of other systems having different specifications, there is an advantage that the device can be generalized (claim 6).

The upper band signal / lower band signal power adjusting type frequency converter divides the intermediate frequency signal into two systems and adjusts the phase of one of the branched intermediate frequency signals. A frequency signal splitter, a first frequency converter that outputs a radio frequency signal by performing frequency conversion using a required local signal for the intermediate frequency signal, and an intermediate frequency signal used by the first frequency converter. A second frequency conversion unit that outputs a radio frequency signal by performing frequency conversion using a local signal having a phase different from that of the local signal; and the two intermediate frequency signals from the intermediate frequency signal branching unit, A switch for input to the first frequency converter or the second frequency converter, and an output of the first frequency converter and the second frequency converter for multiplexing. May be configured as an image cancel mixer and a multiplexing section that outputs to the vessel, in this manner, it is possible to switch dynamically the sideband. Further, since no RF switch is provided at the final stage of transmission, there is an advantage that deterioration such as distortion and insertion loss can be reduced, and power consumption can be reduced. Since a high-attenuation RF switch is not required and unnecessary amplification is not performed, the design conditions of the amplifier can be eased if the transmission output is at the same level. Furthermore, since it can flexibly cope with fluctuations in the amount of attenuation and can follow modulation schemes of other systems having different specifications, there is an advantage that the apparatus can be generalized (claim 7).

Further, the upper band signal / lower band signal power adjusting type frequency converter performs frequency conversion on the intermediate frequency signal using a required local signal, thereby outputting a radio frequency signal. A first filter that passes an upper band signal of the radio frequency signal; a second filter that is provided in parallel with the first filter and passes a lower band signal of the radio frequency signal; It may be configured as a sideband selection circuit provided on the upstream side or downstream side of the first filter and the second filter and having a switch unit for switching a signal path. In this case, the sideband wave can be dynamically changed. It will be possible to switch.
Furthermore, since it is possible to flexibly cope with fluctuations in the amount of attenuation and follow modulation systems of other systems having different specifications, there is an advantage that the device can be generalized, and a large amount of attenuation can be obtained. There is also an advantage. Further, since no RF switch is provided at the final stage of transmission, there is an advantage that deterioration such as distortion and insertion loss can be reduced, and power consumption can be reduced. Since a high-attenuation RF switch is not required and unnecessary amplification is not performed, the design conditions of the amplifier can be relaxed if the transmission output is at the same level (claim 8).

[Brief description of the drawings]

FIG. 1 is a principle block diagram of the first invention.

FIG. 2 is a principle block diagram of the second invention.

FIG. 3 is a principle block diagram of the third invention.

FIG. 4 is a configuration diagram of a hot standby backup system wireless system applied to the present invention.

FIG. 5 is a block diagram of a hot standby transmission / reception device according to the first embodiment of the present invention.

FIG. 6 is a diagram for explaining a sideband switching method.

FIG. 7 is a diagram illustrating a circuit configuration example of an intermediate frequency switching unit.

FIG. 8A is a frequency allocation diagram appearing in an output of a first band rejection filter of a first transmission / reception unit, and FIG. 8B is a frequency allocation diagram appearing in an output of a first band rejection filter of a second transmission / reception unit. is there.

FIG. 9 is a block diagram of a hot standby transmission / reception device according to a second embodiment of the present invention.

FIG. 10 is a diagram for explaining a sideband switching method.

FIG. 11A is a frequency allocation diagram appearing at an output of a frequency conversion unit in a sideband selection unit of each of the first transmission / reception unit and the second transmission / reception unit, and FIG. 11B is a sideband selection diagram of the first transmission / reception unit. It is a layout diagram of the spectrum in the output of a part, and (c) is a layout diagram of the spectrum in the output of the sideband selection part of a 2nd transmission / reception unit.

FIG. 12 is a block diagram of a hot standby transmission / reception device according to a third embodiment of the present invention.

FIG. 13 is a block diagram of a hot standby type transmitting / receiving apparatus according to a fourth embodiment of the present invention.

FIG. 14 is a block diagram of a hot standby transmission / reception device according to a fifth embodiment of the present invention.

FIG. 15 is a block diagram of a hot standby transmission / reception device according to a first modification of the fifth embodiment of the present invention.

FIG. 16 is a block diagram of a hot standby transmission / reception device according to a second modification of the fifth embodiment of the present invention.

FIG. 17A is a block diagram of a sideband selector.
(B) is a figure showing an example of an equivalent block of a sideband selection part.

FIG. 18 is a configuration diagram of a hot standby standby system wireless system.

FIG. 19 is a block diagram of a hot standby transmission / reception device.

[Explanation of symbols]

1, 2, 3 Hot standby type transmission device 1a, 2a, 3a First transmission unit 1b, 2b, 3b Second transmission unit 4 Control unit 5 Upper band signal / lower band signal power adjustment type frequency converter 6 Amplifier 7 Filter 10 Variable attenuator 11 Frequency converter 12 Radio frequency switch 14 IF signal spectrum 15a, 16a, 17a, 18a, 19a Lower band signal spectrum 15b, 16b, 17b, 18b, 19b Upper band signal spectrum 20, 25, 43,44,48,52,56,60
Hot standby type transmission / reception device 21, 29 IDU 21a Switching control unit 22, 26, 45, 49, 53, 57, 61, 64
ODU 23, 27, 46, 50, 54, 58, 62, 66
First transmitting / receiving unit 24, 28, 47, 51, 55, 59, 63, 66 '
Second transmission / reception unit 30 Wireless transmission path (wireless line) 31 Hot standby standby system wireless system 32 Image cancel mixer 32a In-phase hybrid device 32b, 32e 90 ° phase shifter 32c First frequency converter 32d Second frequency converter 32f Synthesizer 33 Intermediate frequency switching unit 34 Transmission pre-stage 34a Cable multiplexer 34b Transmission IF band filter 34c First buffer 35 Transmission post-stage 35b RF detector 35c ALC 35e Antenna duplexer 35f Antenna 36 Receiver 36a Third band filter 36b Low noise amplifier 36c Local oscillator 36d Receiving mixer 36e Receiving IF band filter 36f Second buffer 37, 38, 65 Sideband selecting unit 37a Frequency converting unit 37b RF switching unit 37c First band filter 37d Second band filter Filter 37e Combining unit 38a In-phase hybrid unit 38b, 38e 90 ° phase shifter 38c First frequency converting unit 38d Second frequency converting unit 38f First combining unit 38g RF switching unit 38h First band filter 38i Second band filter 38j Second multiplexer 39 Attenuator transmitter 39a Variable attenuator 39b Frequency converter 39c First band filter 39d RF power amplifier 39e RF detector 39f ALC 39g RF switch 39h Second band filter 39i Antenna duplexer 39j Antenna 65a Frequency conversion Unit 65b Demultiplexing unit 65c First band filter 65d Second band filter 65e RF switching unit 67,68 Intermediate frequency signal branching unit 70,75 Hot standby type transmission / reception device 71,76 IDU 71a Switching control unit 72,77 ODU 73,78 The first transmitting and receiving unit Knit 73a Cable multiplexer 73b First band filter 73c Transmit mixer 73d Local oscillator 73e Second band filter 73f RF power amplifier 73g RF detector 73h ALC 73i RF switch 73j Third band filter 73k Antenna duplexer 73l Antenna 73m Fourth band filter 73n Low noise amplifier 73o Receiving mixer 73p Fifth band filter 73q Buffer 74,79 Second transmitting / receiving unit 80 Wireless transmission line 81 Hot standby standby wireless system 90,91,92,93,94,95 Sideband selection output section 90a, 93c First band rejection filter 90b, 91a, 92a, 93c, 94b, 95b
RF power amplifier 90c, 91b, 92b, 93d, 94c, 95c
Fourth band filters 93a, 94a, 95a Variable attenuator T1, T2 Input terminal T3, T4 Output terminal C1, C2, C3, C4 Capacitor D1, D2, D3, D4 Diode L1, L2 Coil G1, G2 Bias power supply SW1 Switch P1 , P2, P3, P4 Measurement points

Claims (8)

[Claims] 1. An upper-band signal and a lower-band signal for frequency-converting an intermediate-frequency signal into a radio-frequency signal and reducing the signal power of either the upper-band signal or the lower-band signal of the radio-frequency signal. A power adjustment type frequency conversion unit, an amplifier for amplifying the radio frequency signal from the upper band signal / lower band signal power adjustment type frequency conversion unit, and a current transmission frequency for the radio frequency signal amplified by the amplifier. And a pair of transmission systems each including a filter for passing a sideband signal corresponding to the above. One of the transmission systems is configured as an active transmission system.
A hot standby type transmission device, characterized in that the other transmission system is configured as an amplifier activation type backup transmission system. 2. An intermediate frequency signal, wherein the upper band signal / lower band signal power adjustment type frequency converter branches the intermediate frequency signal into two systems and performs phase adjustment on one of the branched intermediate frequency signals. A branching unit, a first frequency conversion unit for outputting a radio frequency signal by performing frequency conversion on the intermediate frequency signal using a required local signal, and a local signal used for the intermediate frequency signal in the first frequency conversion unit A second frequency conversion unit that outputs a radio frequency signal by performing frequency conversion using a local signal having a phase different from that of the first and second intermediate frequency signals from the intermediate frequency signal branching unit. An intermediate frequency switching unit for inputting to the frequency conversion unit or the second frequency conversion unit; and multiplexing the outputs of the first frequency conversion unit and the second frequency conversion unit. Characterized in that it is configured as an image cancel mixer and a multiplexing section that outputs to the width unit,
The hot standby type transmission device according to claim 1. 3. A frequency converter for outputting a radio frequency signal by performing frequency conversion on the intermediate frequency signal using a required local signal, wherein the upper band signal / lower band signal power adjustment type frequency converter is used. A first filter that passes an upper band signal of the radio frequency signal; a second filter that is provided in parallel with the first filter and passes a lower band signal of the radio frequency signal; A side band selecting circuit provided on the upstream side or the downstream side of the first filter and the second filter and having a switch unit for switching a signal path.
The hot standby type transmission device according to claim 1. 4. An intermediate frequency, wherein the upper band signal / lower band signal power adjustment type frequency converter divides the intermediate frequency signal into two systems and adjusts the phase of one of the branched intermediate frequency signals. A signal branching unit, a first frequency converting unit that outputs a radio frequency signal by performing frequency conversion on the intermediate frequency signal using a required local signal, and a local frequency converting unit that uses the intermediate frequency signal for the first frequency converting unit. A second frequency conversion unit that outputs a radio frequency signal by performing frequency conversion using a local signal having a phase different from that of the signal; and a two-system intermediate frequency signal from the intermediate frequency signal branching unit. An intermediate frequency switching unit input to the one frequency conversion unit or the second frequency conversion unit; and an output combining the outputs of the first frequency conversion unit and the second frequency conversion unit. A multiplexing unit, a first filter that passes an upper band signal of the radio frequency signal from the multiplexing unit, and a radio frequency signal provided from the multiplexing unit in parallel with the first filter. A second filter for passing the lower band signal of the signal, and a switch provided on the upstream side or the downstream side of the first filter and the second filter for switching a signal path. The hot standby type transmitting device according to claim 1, wherein the transmitting device is a hot standby type transmitting device. 5. A variable attenuator for attenuating an intermediate frequency signal, and a frequency converter for outputting a radio frequency signal by performing frequency conversion on the intermediate frequency signal from the variable attenuator using a required local signal. An amplifier for amplifying the radio frequency signal from the frequency converter; a radio frequency switch for passing or blocking the radio frequency signal amplified by the amplifier; and an amplifier for the radio frequency signal from the radio frequency switch. A pair of transmission systems including a filter for passing any one of the upper band signal and the lower band signal is provided, and one of the transmission systems is configured as an active transmission system,
A hot standby type transmission device, characterized in that the other transmission system is configured as an amplifier activation type backup transmission system. 6. A variable attenuator for attenuating an intermediate frequency signal, frequency-converting the intermediate frequency signal from the variable attenuator into a radio frequency signal, and converting an upper band signal or a lower band signal of the radio frequency signal. An upper band signal / lower band signal power adjusting type frequency converter for reducing any signal power, and amplifying the radio frequency signal from the upper band signal / lower band signal power adjusting type frequency converter. A pair of a transmission system including an amplifier and a filter for passing a sideband signal corresponding to a current transmission frequency for the radio frequency signal amplified by the amplifier is provided, and one transmission system is configured as a current transmission system. With
A hot standby type transmission device, characterized in that the other transmission system is configured as an amplifier activation type backup transmission system. 7. An intermediate frequency signal converter for adjusting the power of the upper band signal / lower band signal, which divides the intermediate frequency signal into two systems and adjusts the phase of one of the branched intermediate frequency signals. A frequency signal branching unit, a first frequency converting unit for outputting a radio frequency signal by performing frequency conversion on the intermediate frequency signal using a required local signal, and using the intermediate frequency signal in the first frequency converting unit A second frequency converter for outputting a radio frequency signal by performing frequency conversion using a local signal having a phase different from that of the local signal; and a two-system intermediate frequency signal from the intermediate frequency signal branching unit, A switch for inputting to the first frequency converter or the second frequency converter; and multiplexing the outputs of the first frequency converter and the second frequency converter for amplification. Characterized in that it is configured as an image cancel mixer and a multiplexing unit for outputting to,
The hot standby type transmission device according to claim 6. 8. A frequency converter for outputting a radio frequency signal by performing frequency conversion on an intermediate frequency signal using a required local signal, wherein the upper band signal / lower band signal power adjustment type frequency converter is used. A first filter that passes an upper band signal of the radio frequency signal; a second filter that is provided in parallel with the first filter and passes a lower band signal of the radio frequency signal; A side band selecting circuit provided on the upstream side or the downstream side of the first filter and the second filter and having a switch unit for switching a signal path.
The hot standby type transmission device according to claim 6.