JP2022118293A - Radio communication device - Google Patents

Abstract

To provide a radio communication device that analyzes received electric field intensity to properly determine a state of an aerial line or a fault of the device.SOLUTION: There is provided a radio communication device that relays and transmits a broadcast wave, where a processing part 31 of a processing unit 30 periodically stores a log of reception-side electric field intensity in a memory 32, and then the processing part 31 reads the electric field intensity out of the memory 32 to analyze the log of electric field intensity, and recognizes a line break state or a state right before a line break based upon the number of times of change in electric field intensity and a state of the change quantity so as to determine a state of an aerial line or a state of a device fault.SELECTED DRAWING: Figure 1

Description

The present invention relates to a wireless communication device that relays and transmits broadcast waves, and more particularly to a wireless communication device that analyzes received electric field intensity and determines the state of an aerial line or a malfunction of the device.

[Conventional technology]
2. Description of the Related Art Conventional wireless communication devices that relay and transmit broadcast waves in digital terrestrial broadcasting include STL (Transmitter to Studio Link) devices and TTL (Transmitter to Transmitter Link) devices.
This wireless communication device is designed to store the electric field intensity received by the receiving antenna for one year in a one-second cycle.

[Related technology]
In addition, as related prior art, Japanese Patent Application Laid-Open No. 07-244100 “Antenna System Monitoring Device” (Patent Document 1), Japanese Patent Application Laid-Open No. 2010-272978 “Radio Receiver” (Patent Document 2), Japanese Patent Application Laid-Open No. 2013-110501 There is a Japanese Patent Publication No. "Wireless Communication System" (Patent Document 3).

Patent Literature 1 discloses a monitoring device capable of detecting disconnection of an antenna system and a decrease in output electric field intensity.
Patent Document 2 discloses a radio receiving apparatus that performs hard decisions in a multi-carrier scheme and selects a combining method from the maximum ratio combining method, equal gain combining method, and selective combining method according to the determination result.
Patent Literature 3 discloses a wireless communication system that detects failure states of a plurality of reception antennas based on mutual comparison results of respective reception field strength measurement values for each of the plurality of reception antennas.

JP-A-07-244100 JP 2010-272978 A JP 2013-110501 A

However, in the conventional wireless communication device, although the electric field intensity received by the receiving antenna is stored in the memory for one year with a period of one second, there is a problem that the data of the electric field intensity is not sufficiently utilized. was there.

Incidentally, Patent Documents 1 to 3 do not describe a configuration for extracting and analyzing received electric field intensity data stored in a memory and appropriately determining the state of the air line or the failure of the device.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a radio communication apparatus which analyzes the strength of a received electric field and appropriately judges the condition of an aerial line or the failure of the apparatus.

The present invention, which solves the problems of the conventional example, is a wireless communication device that relays and transmits broadcast waves. and a processing unit that analyzes and recognizes the state of line disconnection or the state before line disconnection based on the number of changes in electric field strength and the state of the amount of change, and judges the state of the aerial line or the state of equipment failure. and

In the wireless communication device of the present invention, the processing unit associates weather, device failure, or fluctuation factors of interfering waves with the received electric field strength state, and analyzes the electric field strength log stored in the storage unit. It is characterized by estimating a variable factor.

The present invention relates to a radio communication apparatus that relays and transmits broadcast waves, and in a space diversity reception system that employs equal gain combining, when the reception state of one received wave deteriorates below a specific threshold, selection is performed. It is characterized by switching to synthesis.

The present invention relates to a radio communication apparatus that relays and transmits broadcast waves, in a space diversity reception system employing equal gain combining, when the reception state of one received wave deteriorates below a specific threshold, the other are divided so that the path lengths are equal, and then recombined so that the path lengths are equal.

The present invention relates to a radio communication apparatus for relaying and transmitting broadcast waves, in a space diversity reception system employing equal gain combining, when the reception state of one received wave deteriorates below a specific threshold, It is characterized in that the degraded path is cut off and combined from the open end so that the line length becomes λ/2.

According to the present invention, a storage unit that periodically stores a log of the electric field strength of the receiving side, and an analysis of the log of the electric field strength, and based on the number of changes in the electric field strength and the amount of change, state of line disconnection or disconnection of the line. Since the wireless communication device has a processing unit for recognizing the imminent state and judging the state of the aerial line or the state of the failure of the device, the received electric field strength is analyzed to appropriately determine the state of the aerial line or the failure of the device. have a discernible effect.

According to the present invention, in the space diversity reception system employing equal gain combining, when the reception state of one received wave deteriorates below a specific threshold value, the radio communication apparatus switches to selective combining. There is an effect that the deterioration of the SN ratio can be reduced without performing any special processing.

1 is a schematic diagram showing a first communication system using a first wireless communication device; FIG. FIG. 2 is a schematic diagram showing a second communication system with a space diversity reception scheme using the first wireless communication device; FIG. 4 is a diagram showing the relationship between fluctuation factors and received electric field strength; FIG. 10 is a diagram showing a movement of received electric field intensity and a variation factor estimation sequence; FIG. 5 is a graph showing magnitudes of variations in electric field intensity; FIG. 3 is a graph diagram showing a situation such as line disconnection; FIG. 11 is a graph showing the status of failure continuation; It is a graph chart which shows an inference factor. 1 is a schematic diagram of an STL/TTL receiver employing an SD receive converter; FIG. It is a circuit diagram of simulation. It is a graph chart which shows a simulation result. 1 is a schematic diagram of a receiver of a first configuration example; FIG. FIG. 11 is a schematic diagram of a receiving device of a second configuration example; FIG. 11 is a schematic diagram of a receiver of a third configuration example; FIG. 11 is a circuit diagram of a simulation in which the front is separated from one isolator in the third configuration example; FIG. 16 is a graph showing the simulation results of FIG. 15;

An embodiment of the present invention will be described with reference to the drawings.
[Overview of Embodiment]
A first wireless communication device (first wireless communication device) according to an embodiment of the present invention is a wireless communication device that relays and transmits broadcast waves, and periodically stores a log of electric field strength on the receiving side in a storage unit. , the processing unit analyzes the electric field strength log, recognizes the state of line disconnection or the state before line disconnection based on the number of changes in electric field strength and the state of the amount of change, and determines the state of the aerial line or equipment failure It is a device that can properly judge the situation of the aerial circuit or the failure of the equipment.

Further, a second radio communication device (second radio communication device) according to an embodiment of the present invention is a radio communication device that relays and transmits broadcast waves, and uses a space diversity reception system that employs equal gain combining. When the reception state of one received wave deteriorates below a specific threshold value, the processing unit switches to selective synthesis, which can reduce the deterioration of the SN ratio without performing complicated processing. .

[First wireless communication device: FIGS. 1 and 2]
A first wireless communication device will be described with reference to FIGS. FIG. 1 is a schematic diagram showing a first communication system using a first wireless communication device, and FIG. 2 shows a second communication system using a space diversity reception scheme using the first wireless communication device. 1 is a schematic diagram; FIG.
The first wireless communication device and the second wireless communication device are STL/TTL devices.

[First communication system: Fig. 1]
The first communication system has a transmitting device 10, a receiving device 20, and a processing device 30, as shown in FIG.
The transmission device 10 is double redundant and includes digital modulators 1 a and 1 b, transmission converters 2 a and 2 b, an SHF switch 3 and a transmission antenna 4 .

The receiving device 20 has double redundancy, and includes a receiving antenna 5, a shared receiving distributor 6, receiving converters 7a and 7b, and digital demodulators 8a and 8b.
The processing device 30 includes a processing section 31 and a memory 32 .
In addition, in the first communication system, the first wireless communication device is composed of the receiving device 20 and the processing device 30 .

[Transmitting device 10]
In the transmitter 10, digital modulators 1a and 1b modulate terrestrial digital broadcasting signals into IF (Intermediate Frequency) signals for relay transmission.
The transmission converters 2a and 2b up-convert the signal frequency to microwave (SHF: Super High Frequency) and perform power amplification.
The SHF switcher 3 selects one of the outputs of the transmission converters 2 a and 2 b and outputs it to the transmission antenna 4 . That is, the SHF switcher 3 switches the connection between one of the transmission converters 2 a and 2 b and the transmission antenna 4 .

[Receiving device 20]
In the receiving device 20, the receiving shared distributor 6 distributes the signal received by the receiving antenna 5 to the two receiving transducers 7a and 7b.
Receiving converters 7a, 7b down-convert the received microwaves to IF signals.
The digital demodulators 8a and 8b demodulate the down-converted IF signals into terrestrial digital broadcasting signals and relay them.

[Processing device 30]
In the processing unit 30, the processing unit 31 receives the received electric field strength (value of the received level) received by the receiving antenna 5 as data for investigating the cause when a failure occurs in the receiving converters 7a and 7b. It is acquired periodically and stored in the memory 32 .
Also, the processing unit 31 reads the electric field intensity from the memory 32 and performs an analysis which will be described later.
The memory 32 stores values of the electric field intensity of one second cycle for one year.
The processing device 30 is a device using a computer or the like, and is preferably configured to include a display section and an input section in order to display a graph, which will be described later.

[Second communication system: Fig. 2]
The second communication system, as shown in FIG. 2, is a case of a space diversity (SD) system, and has a transmitting device 110, a receiving device 120, and a processing device .

[Transmitting device 110]
The transmission device 110 has double redundancy. They correspond to digital modulators 1 a and 1 b , transmission converters 2 a and 2 b , SHF switch 3 and transmission antenna 4 of device 10 .

[Receiving device 120]
The receiving device 120 includes two receiving antennas (MAIN antenna 15 and SUB antenna 16), an SD receiving shared distributor 17, SD receiving converters 18a and 18b, and digital demodulators 19a and 19b.
The receiving device 120 is also made double redundant.

Repeated waves are received by two receiving antennas 15 and 16, and the shared SD receiving distributor 17 distributes the repeated waves from each antenna and outputs them to SD receiving converters 18a and 18b.
SD receiving converters 18a and 18b generate composite waves (COMB) from two receiving antennas 15 and 16, down-convert them to IF signals, and output them to digital demodulators 19a and 19b.
Digital demodulators 19a and 19b demodulate the IF signal into a terrestrial digital broadcasting signal.

[Processing device 130]
In the processing unit 130, a processing unit 131 collects relay waves received by the MAIN antenna 15 and the SUB antenna 16 and SD reception conversion data as data for investigating the cause when a failure occurs in the SD reception converters 18a and 18b. The received electric field intensity (value of the received level) of the composite wave at the devices 18a and 18b is obtained at intervals of one second and stored in the memory 132. FIG.

That is, as for the received electric field strength, a total of three electric field strengths are obtained, which are the signal received by the two antennas and the signal synthesized by the SD receiving converter 18a or the SD receiving converter 18b.
Also, the processing unit 131 reads the electric field intensity from the memory 132 and performs an analysis described later.
The memory 132 stores the electric field strength values of the three signals with a period of one second for one year.

[Relationship between fluctuation factors and received field strength: Fig. 3]
Before explaining the processing of the processing units 31 and 131 of the processing devices 30 and 130, the relationship between the fluctuation factor and the received electric field strength will be explained with reference to FIG. FIG. 3 is a diagram showing the relationship between fluctuation factors and received electric field strength.
FIG. 3 shows fluctuation factors, changes in received electric field intensity, and the possibility of line disconnection.
The movement (fluctuation state) of the received electric field intensity is indicated for each of the weather, equipment failure, and interfering waves, and the possibility of line disconnection for each fluctuation factor is indicated.

[Processing of processors 30 and 130: FIG. 4]
Next, processing in the processing units 30 and 130 of the first wireless communication device will be described with reference to FIG. FIG. 4 is a diagram showing movement of received electric field intensity and a variation factor estimation sequence.
The processing units 31 and 131 of the processing devices 30 and 130 read out the accumulated electric field intensity values from the memories 32 and 132 and execute the sequence shown in FIG.

First, the processing units 31 and 131 determine whether or not the electric field strength that can be received, for example, -80 dBm (S1). (S2).

If the electric field strength is not below the receivable electric field strength in processing S1 (if "no"), then it is determined whether recovery has occurred (S3), and if not (if "no"), processing S2 is performed. guess it is.
If it has been restored in step S3 (if yes), then it is determined whether the amount of change in the electric field strength has changed slowly or rapidly (steeply) (S4).

In the process S4, if the amount of change changes slowly ("slowly"), it is estimated that there is a possibility of rainfall (S5).
Also, if the amount of change fluctuates quickly in the process S4 (in the case of "fast"), then the continuity of the fluctuation of the electric field strength is determined (S6).

In the process S6, if the continuity of the electric field strength fluctuation is single (in the case of "single"), it is assumed that there is a possibility of equipment failure or maintenance (S7).
Also, in the process S6, if the continuity of the fluctuation of the electric field strength is continuous ("continuous"), it is estimated that there is a possibility of a thunderstorm or a typhoon (S8).
As described above, the processing units 31 and 131 estimate the fluctuation factor from the movement of the received electric field intensity.

[Graph display example of received electric field strength: Figures 5 to 8]
Graph display examples for classifying and analyzing the received electric field strength accumulated in the memories 32 and 132 and providing information for judging the state of the air line and device failure will be described with reference to FIGS. . FIG. 5 is a graph showing the amount of change in electric field intensity, FIG. 6 is a graph showing the state of line disconnection, etc., and FIG. 7 is a graph showing the state of continued failure. FIG. 8 is a graph showing inference factors.
Specifically, the processing units 31 and 131 extract the data of the electric field intensity in the memories 32 and 132 under the corresponding conditions and generate the graphs shown in FIGS.

[Magnitude of change in electric field strength: FIG. 5]
FIG. 5 shows the amount of change in the electric field strength, the horizontal axis being time and the vertical axis being the number of times the designated electric field strength is changed. Time on the horizontal axis can be set in units of hours (0 to 23:00), units of months (January to December), and units of days (365 days). Also, although the vertical axis indicates "the number of times of change of 10 dB or more", the amount of change can be set arbitrarily.
From the graph in FIG. 5, it is possible to ascertain the number of times that the amount of change is greater than or equal to a specific amount in time series.

[Situation of line disconnection, etc.: Fig. 6]
FIG. 6 shows the state of line disconnection, etc., where the horizontal axis represents time and the vertical axis represents the number of times the electric field strength fell below the specified electric field strength. In FIG. 6, it is "the number of times of -80 dBm or less", so if the value of "-80 dBm", which is the number of line disconnections, is increased to, for example, "-60 dBm" or less, the situation before the line disconnection can also be shown. .
From the graph in FIG. 6, it is possible to grasp the situation of line disconnection or before line disconnection in chronological order.

[Situation of failure continuation state: Fig. 7]
FIG. 7 shows the status of failure continuation state, the horizontal axis is time, and the vertical axis is the number of times that the state of specific electric field strength continues for a specific time. In FIG. 7, for example, the state of "-80 dBm" or less is "the number of times of continuation of 30 minutes or more", so that the state of failure continuation occurs.
From the graph in FIG. 7, it is possible to grasp the failure continuation state and the like in chronological order.

[Inferred factors: Fig. 8]
FIG. 8 shows guess factors, the horizontal axis is time, and the vertical axis is the number of times for each guess factor. The inference factors are obtained according to the sequence of FIG. 4 based on the relationship diagram of FIG.
From the graph in FIG. 8, it is possible to grasp the number of occurrences of inference factors in chronological order.

[Second wireless communication device]
Next, the second wireless communication device will be explained.
The second non-communication device is an improvement of the SD receiving converters 18a, 18b of the receiving device 120 in the second communication system described in the first wireless communication device.
Before entering the description of the second wireless communication device, the premise will be described below.

[Assumption]
In the TS transmission system STL/TTL equipment for terrestrial digital broadcasting, there are lines in which fading may occur in which the reception electric field frequently fluctuates due to the influence of topography, obstacles, and the like.
In such a line, a diversity reception system is often employed in which a plurality of received waves with low correlation are obtained and combined to prevent deterioration of reception characteristics.

[STL/TTL receiver adopting SD receiver converter: FIG. 9]
FIG. 9 shows a schematic diagram of a TS transmission system STL/TTL device that adopts an SD (Space Diversity) reception system using two sufficiently spaced antennas among diversity reception systems. FIG. 9 is a schematic diagram of an STL/TTL receiver employing an SD receiver converter.

In the STL/TTL receiver, as shown in FIG. 9, the digital modulator 11 of the transmitter modulates the signal into an IF signal for relay transmission, and the transmission converter 12 up-converts it to microwaves and amplifies the power. An RF (Radio Frequency) signal is transmitted from a transmission antenna.
The receiving device receives RF signals with antennas (1) and (2), performs phase adjustment with phase adjusters 181-1 and 181-2 of SD receiving converter 18, and down converters 182-1 and 182-2. , the IF signal is input to the combiner 184 via isolators (IOS) 183-1 and 183-2 for down-converting to an IF signal and preventing signal wraparound.

The synthesizer 184 synthesizes the received waves by three methods for synthesizing received waves, which will be described later, and the digital demodulator 19 demodulates the synthesized signal into a terrestrial digital broadcasting signal.
Three synthesis methods for synthesizing two received waves will be described below.

[Three synthesis methods]
Methods for synthesizing the two received waves obtained are broadly classified into three.
The first combining method is called a selection combining method, which is a method of selecting a received wave with the highest signal strength.
The second combining method is called equal-gain combining, which is a method of matching the phases of all received waves and combining them, and can obtain a higher SN (Signal/Noise) ratio than the selective combining method.
The third combining method is called maximum ratio combining, in which the phases of all received waves are matched and then weighted according to the SN ratio of each received wave. The SN ratio obtained is maximized.

The equal-gain combining method is simpler in processing than the maximum-ratio combining method and has the advantage of being able to obtain a higher SN ratio than the selective combining method. When this equal-gain combining method is adopted, an isolator (IOS) is often inserted before combining so that if the reception characteristics of one side deteriorate and break down, the interference from the other path will not cause a failure.

However, by inserting an isolator, if both received waves are received normally, the composite wave will have a better SN ratio than the single received wave. Since the wraparound signal is terminated, a phenomenon occurs in which the SN ratio of the composite wave is degraded compared to that of the single received wave.

[Simulation circuit: Fig. 10]
As an example, as shown in FIG. 10, the input side impedance is 50 Ω, the output side line length is λ/4, and the impedance is √(25*50)=35.4 Ω. A power simulation was performed for the synthesis of two waves using FIG. 10 is a circuit diagram of the simulation.

[Simulation result: FIG. 11]
The results of the simulation, as shown in FIG. 11, are for the case of synthesizing two signals with an input level of 0 dBm at 1 GHz above and below 1 GHz. FIG. 11 is a graph showing simulation results. In FIG. 11, the horizontal axis indicates the frequency around 1 GHz, and the vertical axis indicates the power (dBm). Note that the input power is the curve in the middle of the three tiers.

When two signals are normally input, the composite power rises by 3 dB compared to the input signal alone. The combined power under normal conditions is the upper curve.
If one of the inputs is eliminated here, the combined power will be 3 dB lower than that of the input signal alone. Therefore, when there is no signal on one side, the power will drop by 6 dB from the normal state. The combined power of one-sided input failure is the lower curve.
Since the SNR is the ratio of the signal level to the noise level, if the signal level drops by 6 dB, the SNR will also degrade by 6 dB.

As means for reducing the degradation of the SN ratio due to the wraparound of received waves, it is conceivable to use only the normal input when the reception characteristics of one side are degraded. With this method, the power of the synthesized signal is the same as that of the input signal, so the deterioration of the SN ratio can be suppressed to 3 dB compared to the normal time.

Therefore, in the second radio communication apparatus, in the diversity reception system using the equal gain combining method, even when the characteristics of one received wave deteriorate, the deterioration of the SN ratio is reduced without requiring complicated processing. there is

[Configuration example in the second wireless communication device]
Next, in the second wireless communication device, when the reception characteristics of one side deteriorate below a specific threshold, the SD receiver that uses only normal inputs will be described with reference to FIGS. 3 will be described.
FIG. 12 is a schematic diagram of the receiving apparatus of the first configuration example, FIG. 13 is a schematic diagram of the receiving apparatus of the second configuration example, and FIG. 14 is a schematic diagram of the receiving apparatus of the third configuration example. It is a diagram.

[First Configuration in Second Wireless Communication Device: FIG. 12]
The receiving apparatus of the first configuration example is a combination of an equal gain combining circuit and a selective combining circuit. As shown in FIG. Phase adjusters 181-1, 181-2, down converters 182-1, 182-2, isolators (IOS) 183-1, 183-2, switches (SW) (1) to (4) as combiners ), and reception characteristic monitoring units 40-1 and 40-2.
Configurations and operations other than SW(1) to (4) and reception characteristic monitoring units 40-1 and 40-2 are the same as those described with reference to FIG.

The reception characteristic monitoring units 40-1 and 40-2 are processing units that monitor the reception characteristics (for example, received electric field strength) of the signals input from the antennas (1) and (2). It controls the switching of SW(1)-(4) when the deterioration is below the threshold value.

SW(1) switches the output from isolator 183-1 to SW(4) or SW(3). When the reception characteristics of antenna (1) are normal or abnormal, SW(4 ), and switches to SW (3) when the reception characteristics of the antenna (2) are abnormal.

SW(2) switches the output from isolator 183-2 to SW(4) or SW(3). When the reception characteristics of antenna (2) are normal or abnormal, SW(4 ) and switches to SW (3) when the reception characteristics of antenna (1) are abnormal.

SW(3) switches to select either SW(1) or SW(2) and outputs to SW(4). Specifically, when the receiving characteristic of one antenna is degraded, switching is made to connect to the other SW that is not degraded.

SW(4) is normally connected to both SW(1) and SW(2) to input a combined signal from two antennas. It is connected to SW(3) and switched so that only normal reception signals are input.

FIG. 12 shows a normal state, in which equal gain synthesis is performed. For example, when the reception characteristics of the antenna (1) deteriorate, the reception characteristics monitoring unit 40-1 recognizes the deterioration, connects SW (1) to SW (4) as it is, and switches SW (2). ) from being connected to SW(4) to being connected to SW(3), switching SW(3) to be connected to SW(2), and switching SW(4) to be connected to SW(3).

As a result, the input on the antenna (1) side whose reception characteristics have deteriorated is separated by SW (4), and only the input on the antenna (2) side is switched by switching SW (2), SW (3), and SW (4). It is possible to select.
This first configuration example corresponds to the third aspect of the invention.

[Second Configuration in Second Wireless Communication Device: FIG. 13]
In the receiving apparatus of the second configuration example, in the equal gain combining circuit, the front side of the isolator in the path where the receiving characteristic has deteriorated is separated, and the normal input is distributed and combined again.
As shown in FIG. 13, the receiving apparatus of the second configuration example is substantially the same as the first configuration example, except for the configuration and operation of SW (11) to (14), the reception characteristic monitoring unit 40-3, The control of the 40-4 is different.

Specifically, the reception characteristic monitoring unit 40-3 switches between connecting SW(11) to the isolator 183-1 and connecting it to the termination. The reception characteristic monitor 40-4 switches between connecting the SW (12) to the isolator 183-2 and connecting it to the termination.
When SW (13) is connected to the termination of SW (12), the reception characteristic monitoring unit 40-4 switches from the termination to circuit connection, distributes and synthesizes the output signal from SW (11), and receives the signal. When SW (11) is connected to the terminal, the characteristics monitoring unit 40-3 switches SW (14) from the terminal to the circuit side, and distributes and synthesizes the output signal from SW (12).

FIG. 13 shows the normal state. When deterioration of reception characteristics on one side is detected, the SW in the path is switched to disconnect the previous stage including the isolator.
When the receiving characteristic of the antenna (1) deteriorates and the SW (11) is switched to the terminal, at the same time, the SW (13) remains connected to the terminal and the SW (14) is switched to be connected to the non-terminal. .
If the reception characteristics of the antenna (2) are degraded and the SW (12) is switched to the terminal, the SW (14) remains connected to the terminal and the SW (13) is switched to be connected to the non-terminal. .

By switching the switches as described above, it is possible to distribute only normal inputs and synthesize them again. However, as shown in FIG. 13, the length of the two paths to be distributed must be equal. That is, the two distributed paths are designed to have the same length.
In this case, although the power of the signal drops by 3 dB in the distribution portion, it rises again by 3 dB by combining, so that the same effect as in the first configuration example in which normal inputs are selected and used can be obtained.

[Third Configuration in Second Wireless Communication Device: FIG. 14]
The receiving apparatus of the third configuration example obtains the same effect as the first and second configuration examples only by separating the front stage including the isolator of the path in which the reception characteristics are degraded in the equal gain combining circuit. .
As shown in FIG. 14, the receiving apparatus of the third configuration example is substantially the same as the first configuration example, except for the configuration and operation of SWs (21) and (22), the reception characteristic monitoring unit 40-5, The control of the 40-6 is different.

In the receiving apparatus of the third configuration example, when the reception characteristic monitoring units 40-5 and 40-6 detect the deterioration of the reception characteristic on one side, the switch on that path is switched. In other words, when the reception characteristic monitor 40-5 recognizes that the reception characteristic of the signal input to antenna (1) has deteriorated, SW (31) is switched to the terminal, and the reception characteristic monitor 40-6 detects antenna (2). When it recognizes that the reception characteristic of the signal input to is degraded, SW (32) is switched to the termination.

By performing such control, it is possible to totally reflect the wraparound signal at the open end and eliminate the power loss of the composite wave. However, the line length from the open end (termination) of SW to the combining section must be λ/2.

[Simulation of the third configuration example: FIGS. 15 and 16]
As for the third configuration example, FIG. 15 shows a circuit configuration in which the line length of 50Ω is set to λ/2 in the simulation of FIG. 10 and the front is separated from the isolator on one side. FIG. 16 shows a simulation result of combined power in the circuit configuration. The composite power was about 0 dBm, which was equivalent to the power of the input alone. FIG. 15 is a circuit diagram of a simulation in which the front is separated from one isolator in the third configuration example, and FIG. 16 is a graph showing the simulation results of FIG.

[Effects of Embodiment]
According to the first wireless communication device, which is a wireless communication device that relays and transmits broadcast waves, the processing unit 31 of the processing device 30 periodically stores the log of the electric field strength on the receiving side in the memory 32 and processes the log. The unit 31 analyzes the field strength log, recognizes the state of the line disconnection or the state before the line disconnection based on the number of changes in the field strength and the amount of change, and judges the state of the aerial line or the state of the device failure. Therefore, there is an effect that the state of the air line or the failure of the device can be judged properly.

According to the second radio communication device, the radio communication device relays and transmits broadcast waves, and in a space diversity reception system employing equal gain combining, the reception state of one received wave exceeds a specific threshold value. When deterioration occurs, the reception characteristic monitoring unit 40 switches to selective combining, so there is an effect that the deterioration of the SN ratio can be reduced without performing complicated processing.

INDUSTRIAL APPLICABILITY The present invention is suitable for a wireless communication device that analyzes the strength of the received electric field and properly judges the state of the air line or the failure of the device.

1a, 1b... Digital modulator 2a, 2b... Transmitting converter 3... SHF switch 4... Transmitting antenna 5... Receiving antenna 6... Shared receiving distributor 7a, 7b... Receiving converter 8a, 8b Digital demodulator 10, 110 Transmitter 11a, 11b Digital modulator 12a, 12b Transmitting converter 13 SHF switch 14 Transmitting antenna 15 MAIN antenna 16 SUB antenna 17 ... SD reception shared distributor 18, 18a, 18b ... SD reception converter 19a, 19b ... Digital demodulator 20, 120 ... Receiving device 30, 130 ... Processing device 31, 131 ... Processing unit 32, 132 ... memory 184 ... combiner 181-1, 181-2 ... phase adjuster 182-1, 182-2 ... down converter 183-1, 183-2 ... isolator (IOS) 40-1, 40- 2, 40-3, 40-4, 40-5, 40-6 ... Reception characteristic monitor

Claims (5)

A wireless communication device that relays and transmits broadcast waves,
a storage unit that periodically stores a log of the electric field strength of the receiving side;
A process of analyzing the log of the electric field strength, recognizing the state of the line disconnection or the state before the line disconnection based on the number of changes in the electric field strength and the state of the amount of change, and judging the state of the aerial line or the state of the equipment failure. A wireless communication device, comprising: a section; The processing unit associates the received electric field strength with weather, equipment failure, or fluctuation factors of interfering waves, and estimates the fluctuation factors by analyzing the electric field strength log stored in the storage unit. The radio communication device according to claim 1. A wireless communication device that relays and transmits broadcast waves,
A radio communication apparatus characterized by switching to selective combining when the reception state of one received wave deteriorates below a specific threshold in a space diversity reception system employing equal gain combining. A wireless communication device that relays and transmits broadcast waves,
In a space diversity reception system employing equal gain combining, when the reception state of one received wave deteriorates below a specific threshold, the other normal received wave is distributed so that the path lengths are equal, A radio communication apparatus characterized by recombining so that the path lengths are equal. A wireless communication device that relays and transmits broadcast waves,
In a space diversity reception system employing equal gain combining, when the reception state of one received wave deteriorates below a specific threshold value, the deteriorated path is separated and the line length from the open end becomes λ/2. A radio communication device, characterized in that it synthesizes

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