JP2012080311A - Signal receiving/analyzing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a signal receiving/analyzing device which can reduce degradation of signal quality due to noise in a device which transmits a signal subjected to frequency conversion and composition for each channel by a signal reception unit to a signal analysis unit on one transmission line, and analyzes the signal by the signal analysis unit by performing frequency conversion again for each channel.SOLUTION: A signal analysis unit 2 outputs a reference signal generated from a reference signal generation unit 26 to a frequency divider 29 provided for each channel and transmits the reference signal to a signal reception unit 1. The signal reception unit 1 receives the reference signal and distributes the reference signal to a frequency divider 17 provided for each channel. Each frequency divider 17 and each frequency divider 29 divide the frequency of the reference signal by a frequency division value preset for each channel. The divided frequency is used by the signal reception unit 1 of a signal receiving/analyzing device in the first frequency conversion for converting to a different frequency for each channel, and by a signal analysis unit 2 in the second frequency conversion for returning the converted frequency to the original frequency.

Description

  The present invention relates to a signal reception analysis apparatus used in a measuring instrument such as a medical MRI, and more particularly to a signal reception analysis apparatus that can reduce signal quality degradation due to phase noise or the like.

[Conventional signal reception analyzer: FIG. 4]
A conventional signal reception analysis apparatus will be described with reference to FIG. FIG. 4 is a configuration block diagram showing a conventional signal reception analysis apparatus.
As shown in FIG. 4, the signal reception analyzing apparatus receives and analyzes a signal transmitted wirelessly from the signal generation source 3, and includes a signal receiving unit 1 'and a signal analyzing unit 2'.

The signal receiving unit 1 ′ receives a signal from a signal generation source and outputs a plurality of antennas as channel signals, and a plurality of amplifying units 11-1 and 11 − connected to the antennas and amplifies and outputs the channel signals. 2, ... 11-N.
The signal from the signal generation source 3 is a signal having a specific frequency component. When there are a plurality of signal sources, each antenna of the signal receiving unit 1 ′ receives a plurality of signals. ing. In addition to the antenna, there is a configuration including a microphone that receives an audio signal, a coupler that receives an optical signal, and the like.

In addition, the signal analysis unit 2 ′ controls a plurality of signal conversion units 21-1, 21-2,..., 21 -N that perform signal conversion on the signal received from the signal reception unit 1 and analyzes the converted signals. / Analyzing unit 22.
The signal converter 21 adjusts the channel signal received and amplified by the signal receiver 1 to an optimal amplitude, converts the channel signal to an optimal frequency, and then performs analog-digital signal conversion.
The control / analysis unit 22 analyzes the received signal based on the information of the plurality of signals subjected to the digital conversion process, and controls the amplitude adjustment in the signal conversion unit 21 as necessary.

[When there is a single signal source: Fig. 5]
The signal source 3 is not limited to having a plurality of generation sources, but may be a single generation source. FIG. 5 is an explanatory diagram of a conventional signal reception analysis apparatus when the signal source 3 is single.
As shown in FIG. 5, even when the signal generating source 3 is single, it is received by a plurality of antennas of the signal receiving unit 1 ′ to be a plurality of channel signals. The following operations are the same as those in FIG.

[When the signal receiver and signal analyzer are installed separately]
The signal receiving unit 1 ′ is preferably installed near the signal generating source 3 in order to accurately receive the signal from the signal generating source 3, but the signal analyzing unit 2 ′ is physically difficult to install. For this reason, it is not uncommon to be installed at a position spatially separated from the signal receiving unit 1 ′ because it tends to be a noise generation source for handling digital signals.

  In this way, when the signal receiving unit 1 'and the signal analyzing unit 2' are located at spatially separated positions, the signal receiving unit 1 'and the signal analyzing unit 2' are connected by a transmission line such as a coaxial cable. The If a plurality of received signals are simply added, the unique information of each signal may be lost. Therefore, the signal receiving unit 1 ′ and the signal analyzing unit 2 ′ are in a one-to-one relationship by a transmission line such as a coaxial cable. Often connected.

  When the signal receiving unit 1 ′ and the signal analyzing unit 2 ′ are connected by a one-to-one cable, the same number of coaxial cables are required as the number of signal channels (outputs from the amplification unit). In the example of FIG. 4, since there are N channels, N cables are necessary. Increasing the number of channels increases the complexity of the connection, the weight of the device, and the amount of work for manufacturing the device, and depending on the type of cable and signal used, crosstalk between channels may be a problem. .

[Conventional signal reception analyzer (2): FIG. 6]
Next, another conventional signal reception analysis apparatus will be described with reference to FIG. FIG. 6 is a block diagram showing the configuration of another conventional signal reception analysis apparatus.
As shown in FIG. 6, another conventional signal reception analysis device reduces the transmission path connecting the signal reception unit and the signal analysis unit by frequency-converting and adding the received signal to a different frequency for each channel. To do. Therefore, the signal receiving unit and the signal analyzing unit are provided with a frequency converting unit for each channel.

  Specifically, the signal receiving unit 1 ″ of another conventional signal reception analysis apparatus includes N antennas and amplification units 11-1, 11-1,... 11-N and frequency conversion units 12-1, 12. -1,... 12-N, local oscillators 13-1, 13-1,... 13-N, and bandpass filters 14-1, 14-1,. Furthermore, a band pass filter 15 and a distribution unit 16 are provided.

The frequency conversion unit 12 is provided corresponding to each amplification unit 11 and converts each channel signal into a specific frequency corresponding to each channel. In the example of FIG. 6, the frequency converter 12-1 converts to the frequency f1, the frequency converter 12-2 converts to the frequency f2, and the frequency converter 12-N converts to the frequency fN in the same manner.
The local oscillator 13 supplies a specific frequency used for frequency conversion in the frequency converter 12 to the corresponding frequency converter 12 in synchronization with the input reference signal.

The band pass filters 14-1 to 14-N perform band limitation for allowing a specific frequency band to pass for each channel of the frequency-converted signal.
The band pass filter 15 limits the band of the signal including the reference signal received from the signal analysis unit 2 ″.
The distribution unit 16 distributes the received reference signal and supplies it to the local oscillators 13-1 to 13-N.

  The signal analysis unit 2 ″ includes band-pass filters 24-1, 24-1,... 24-N, frequency conversion units 25-1, 25-1,... 25-N, and local oscillators 23-1, 23. -1,... 23-N, signal converters 21-1, 21-2,... 21-N, control / analyzer 22, reference signal generator 26, distributor 27, and bandpass filter 28 It has.

  The band pass filter 24 limits the sum signal received and distributed via the transmission path to a specific band for each channel. Here, the band-pass filter 24 extracts the same band as the band-pass filter 14 of the signal receiving unit 1 ″. In other words, the band-pass filter 24-1 extracts the frequency f1 from the synthesized received signal and performs band-pass. The filter 24-2 extracts the frequency f2, and the band pass filter 24-N extracts the frequency fN.

  The frequency conversion unit 25 is configured by a mixer or the like, performs frequency conversion on the band-limited signal using the frequency from the local oscillator 23, and converts it to the original received signal frequency. In addition, even if it does not necessarily return to the first frequency, it is also possible to convert to an appropriate frequency according to the processing.

The local oscillator 23 generates a specific frequency in synchronization with the input reference signal and outputs the specific frequency to the corresponding frequency converter 25. Here, the local oscillator 13 of the signal receiving section 1 ″ and the local oscillator 23 of the signal analyzing section 2 ″ output the same frequency for each channel.
The signal converter 21 performs signal conversion such as amplitude adjustment on the frequency-converted signal.
The control / analysis unit 25 analyzes the received signal and controls the amplitude adjustment in the signal conversion unit 21.

The reference signal generation unit 26 includes a PLL (Phase Locked Loop) synthesizer, a DDS (Direct Digital Synthesizer), and the like, and generates a reference signal.
The distribution unit 27 distributes the reference signal and outputs it to the local oscillators 23-1 to 23 -N and the band pass filter 28.
The band-pass filter 28 limits the band of the reference signal to remove noise, and outputs it to the transmission / reception unit (shown by black circles in the figure) for transmission to the signal reception unit 1 ″.

[Operation of Another Conventional Signal Reception Analysis Device: FIG. 6]
The operation of another conventional signal reception analysis apparatus will be described with reference to FIG.
In the signal reception analysis apparatus, signals received by the respective antennas of the signal reception unit 1 ″ are amplified by the amplification unit 11 and output to the frequency conversion unit 12.
The reference signal received from the signal analysis unit 2 ″ via the transmission path is band-limited by the band pass filter 15, distributed by the distribution unit 16, and output to each local oscillator 13, and the local oscillator 13 receives the reference signal. A specific frequency is generated for each channel in synchronization with the signal and output to the frequency converter 12.

Each channel signal is multiplied by a signal from the local oscillator 13 in the frequency converter 12 and converted into a specific frequency for each channel, and an N-channel signal is added in the transmitter / receiver (shown by a black circle in the figure). And transmitted to the signal analysis unit 2 ″ through the transmission line.
By converting the signals of a plurality of channels into different frequency signals, signal addition can be performed and the number of transmission lines can be reduced.

  In the signal analysis unit 2 ″, the reference signal generated by the reference signal generation unit 26 is distributed by the distribution unit 27, band-limited by the band pass filter 28, and transmitted to the signal reception unit 1 ″ via the transmission path. . The reference signal is also supplied to each local oscillator 23.

The combined received signal from the signal receiving unit 1 ″ is distributed to the band pass filters 24-1 to 24-N by the transmission / reception unit of the signal analyzing unit 2 ″, and each band pass filter 24 specifies a specific channel for each channel. The frequency is limited to the band and is input to the frequency converter 25 and converted to the original frequency using the frequency from the corresponding local oscillator 23.
Then, the signal conversion unit 21 performs signal conversion, and the control / analysis unit 22 performs signal analysis.

[Noise associated with frequency conversion]
By the way, in another conventional signal receiving and analyzing apparatus shown in FIG. 6, frequency conversion is performed in the signal receiving unit 1 ″ and the signal analyzing unit 2 ″, and conversion is performed with signals from independent local oscillators. Each time frequency conversion is performed, different noises are added independently, making it difficult for the signal analysis unit 2 ″ to remove the noises.

[Related technologies]
As a technique relating to a device for generating a frequency signal, there is JP-A-2003-69524 "Multi-channel digital broadcast pseudo signal generator" (Applicant: Hitachi Kokusai Electric Inc., Patent Document 1).
Patent Document 1 describes an apparatus that converts an OFDM signal having an IM frequency generated by an OFDM signal generation unit into a frequency of a setting channel using an RF converter, mixes the OFDM signal using an RF mixing unit, and outputs the mixed signal to an output terminal. ing.

JP 2003-69524 A

  However, in the conventional signal reception analysis device, frequency conversion is performed using different local oscillators having different phase noise characteristics in the signal reception unit and the signal analysis unit, so that each noise is added and the signal quality is improved. There was a problem of deterioration.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a radio and a radio communication system capable of reducing signal quality degradation due to phase noise or the like.

  The present invention for solving the problems of the above-mentioned conventional example branches a received radio signal into a plurality of channels, performs a first frequency conversion for converting to a different frequency for each channel, and synthesizes the converted signals A signal receiving unit that outputs the signal through the transmission line, and a second frequency conversion that receives the combined signal through the transmission line, branches to a plurality of channels, and converts each channel to the original frequency. A signal reception analysis device including a signal analysis unit for analyzing the converted signal, wherein the signal analysis unit generates a reference signal that is a specific frequency signal, and a plurality of reference signals A dividing unit that distributes and a transmitting unit that transmits the distributed reference signal to the signal receiving unit, and that divides the distributed reference signal by a specific dividing value corresponding to the channel for each channel. And the frequency output from the divider A frequency conversion unit that performs second frequency conversion using a number, and the signal reception unit includes a reception unit that receives a reference signal via a transmission path, a distribution unit that distributes the reference signal, and a channel A frequency divider that divides the distributed reference signal by a frequency-divided value corresponding to the channel, and a frequency converter that performs the first frequency conversion using a frequency output from the frequency divider. It is characterized by that.

  According to the present invention, the received radio signal is branched into a plurality of channels, the first frequency conversion is performed for converting the frequency into a different frequency for each channel, and the converted signals are synthesized and output via the transmission path. A signal that receives a combined signal via a signal receiving unit and a transmission path, branches to a plurality of channels, performs second frequency conversion for converting each channel to the original frequency, and analyzes the converted signal A signal reception analysis device including an analysis unit, wherein the signal analysis unit is distributed with a reference signal generation unit that generates a reference signal that is a specific frequency signal, a distribution unit that distributes the reference signal into a plurality of signals, A transmitter that transmits a reference signal to the signal receiver, and a frequency divider that divides the distributed reference signal by a specific division value corresponding to the channel for each channel, and is output from the divider The second frequency conversion using the frequency A frequency conversion unit that performs the processing, and the signal reception unit includes a reception unit that receives the reference signal via the transmission path, and a distribution unit that distributes the reference signal, and the distributed reference signal is channeled for each channel. Since the signal reception analyzing device includes a frequency divider that divides the frequency by a frequency value corresponding to the frequency and a frequency conversion unit that performs the first frequency conversion using a frequency output from the frequency divider, And the signal analysis unit can perform frequency conversion using frequencies generated from the same reference signal and having similar phase noise characteristics, and the signal analysis unit cancels the noise added by the signal reception unit. There is an effect that it is possible to reduce degradation of signal quality and perform highly accurate analysis.

1 is a configuration block diagram of a signal reception analysis apparatus according to a first embodiment of the present invention. It is a block diagram of the configuration of the signal reception analysis apparatus according to the second embodiment of the present invention. It is a block diagram of the configuration of the signal reception analysis apparatus according to the third embodiment of the present invention. It is a configuration block diagram showing a conventional signal reception analysis device. It is explanatory drawing of the conventional signal reception analysis apparatus in case the signal generation source 3 is single. It is a block diagram of another conventional signal reception analysis device.

[Outline of the embodiment]
Embodiments of the present invention will be described with reference to the drawings.
The signal reception analysis apparatus according to the embodiment of the present invention converts a signal of a plurality of channels received by the signal reception unit into a different frequency for each channel, synthesizes and transmits the signal to the signal analysis unit, and receives by the signal analysis unit The signal is distributed to the number of channels, converted to the original frequency for each channel and analyzed, and the reference signal is sent to the signal receiver and signal analyzer at a specific frequency division ratio set for each channel. A frequency divider is used, and the frequency converter performs frequency conversion using the frequency output from the corresponding divider, and is generated from the same reference signal in the signal receiver and signal analyzer. The frequency conversion can be performed using the frequency signal thus generated, and the noise added by the signal receiving unit can be canceled by the signal analyzing unit to reduce the noise.

  In addition, the signal reception analysis device according to the exemplary embodiment of the present invention inputs the signal analysis unit to each frequency divider of the signal analysis unit for a time corresponding to the transmission delay between the signal reception unit and the signal analysis unit. With a delay unit that delays the reference signal to be received, and even when the distance between the signal receiving unit and the signal analyzing unit is increased, the noise can be canceled with high accuracy and the noise can be reduced. It is.

  In addition, the signal reception analysis device according to the embodiment of the present invention includes a signal reception unit and a signal analysis unit, a variable bandpass filter for each channel, and a frequency divider that divides a reference signal by a specific frequency division ratio. The control / analysis unit of the signal analysis unit instructs the variable band filter and the frequency divider of the signal analysis unit to specify the pass band and the frequency division value according to each channel, and the variable band of the signal reception unit. As an instruction to the filter and the frequency divider, frequency division value / band control information for instructing the pass band and the frequency division value is generated, modulated and transmitted to the signal reception unit. The signal reception unit receives the received signal. Demodulate and acquire frequency division value / bandwidth control information, and the control unit instructs the variable bandpass filter and frequency divider based on the information to pass band and frequency division value corresponding to each channel, and receives the signal. Frequency dividers and signal analyzers are output from the reference signal generator. The reference signal is frequency-divided by the instructed dividing value, and the frequency corresponding to the channel is output to the frequency conversion unit, and each variable bandpass filter passes the instructed band, and the signal receiving unit The signal analyzer can perform frequency conversion using the frequency signal generated from the same reference signal, and the noise added by the signal receiver can be canceled by the signal analyzer to reduce the noise. Furthermore, the pass band of the band pass filter can be changed at any time and the frequency division ratio can be controlled accordingly, so that it can be flexibly adapted even when the signal source or the frequency of the signal to be acquired changes. It is.

[First Embodiment: FIG. 1]
A signal reception analysis apparatus (first apparatus) according to a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing the configuration of a signal reception analysis apparatus according to the first embodiment of the present invention. In addition, the same code | symbol is attached | subjected about the structure and operation | movement part similar to FIG.4,5,6, and detailed description is abbreviate | omitted here.
As shown in FIG. 1, the first device includes a signal receiving unit 1 and a signal analyzing unit 2, and the signal receiving unit includes amplifying units 11-1 to 11 -N connected to an antenna, and frequency conversion. Units 12-1 to 12-N, band-pass filters 14-1 to 14-N, band-pass filter 15, distribution unit 16, and frequency dividers 17-1 to 17 which are characteristic parts of the first device -N. Although not shown in the figure, a transmission / reception unit that performs transmission / reception with the signal analysis unit 2 via a transmission path is provided.

  The signal analysis unit 2 includes band-pass filters 24-1 to 24-N, frequency conversion units 25-1 to 25-N, signal conversion units 21-1 to 21-N, a control / analysis unit 22, , A reference signal generation unit 26, a distribution unit 27, a band pass filter 28, and frequency dividers 29-1 to 29-N which are characteristic parts of the first device. Further, a transmission / reception unit that performs transmission / reception with the signal reception unit 1 via a transmission path is provided.

The frequency dividers 17 and 29 that are characteristic parts of the first device will be described.
The frequency divider 17 of the signal receiving unit 1 divides the input reference signal by a preset frequency dividing value, and outputs it to the corresponding frequency converting unit 12. In the first device, the frequency division value of each frequency divider 17 is preset according to the channel.
Similarly, the frequency divider 29 of the signal analysis unit 2 divides the reference signal input at a frequency division value set in advance according to the channel, and outputs the reference signal to the corresponding frequency conversion unit 25.
Here, the frequency division values of the frequency divider 17 and the frequency divider 29 are the same for each channel.

That is, in the first device, the reference signal output from the signal analysis unit 2 is divided by the frequency dividers 17 and 29 without using an independent local oscillator, and the signal reception unit 1 and the signal analysis unit 2 are divided. It is characterized in that it is used for frequency conversion in both.
The frequency used for frequency conversion by the signal receiving unit 1 (output of the frequency divider 17) and the frequency used for frequency conversion by the signal analyzing unit 2 (output of the frequency divider 29) are derived from the same reference signal. Since they are generated signals, they have the same phase noise characteristics.

  As a result, the noise added when the frequency conversion unit 12 performs frequency conversion using the frequency divided by the frequency divider 17 converts the frequency using the frequency signal having the same characteristic from the frequency divider 29. It is canceled and reduced by frequency conversion again by the unit 25.

  Since noise generated by the frequency divider is added by both the signal receiving unit 1 and the signal analyzing unit 2, it is desirable to use a low noise frequency divider as the frequency dividers 17 and 29. As a result, noise can be greatly reduced as compared with the conventional case where a local oscillator is used.

[Operation of the first apparatus: FIG. 1]
The operation of the first device will be described.
In the first device, the reference signal generated by the reference signal generation unit 26 of the signal analysis unit 2 is distributed by the distribution unit 27 to the plurality of frequency dividers 29 and the band pass filter 28 of the signal analysis unit 2. The reference signal input to the band-pass filter 28 is band-limited, then received by the signal receiving unit 1 from the transmission / reception unit via the transmission path, and band-limited by the band-pass filter 15.
Then, the signal is distributed to the plurality of frequency dividers 17 of the signal receiving unit 1 by the distributing unit 16.
The frequency divider 17 divides the reference signal distributed by a preset frequency division value for each channel and outputs the divided reference signal to the frequency converter 12.

  On the other hand, the radio signal received by each antenna of the signal receiving unit 1 is amplified by the amplifying unit 11, and the frequency converting unit 12 for each channel uses a frequency signal from the frequency divider 17 to specify a specific frequency for each channel. The frequency is converted to (f1, f2,...). The frequency signal from the frequency divider 17 is a signal obtained by dividing the reference signal by a frequency division value corresponding to the channel.

The signal frequency-converted by the frequency converter 12 is added with noise reduced by an amount corresponding to the frequency division number from the noise of the reference signal and noise generated by the frequency divider.
Then, the frequency-converted channel signal is band-limited by the band-pass filter 14, N-channel signals are synthesized, output from the transmission / reception unit, and transmitted to the signal analysis unit 2 through the transmission path.

  The synthesized signals for N channels received by the signal analysis unit 2 are distributed to band filters 24-1 to 24-N, and each band pass filter 24 is limited to a frequency band corresponding to the channel, and a desired signal is extracted. It is. Then, each frequency conversion unit 25 performs frequency conversion using the frequency signal input from the corresponding frequency divider 29. The frequency divider 29-i of the signal analyzer 2 divides the reference signal by the same frequency as the frequency divider 17-i of the signal receiver 1 of the corresponding channel, and outputs the same frequency.

Here, since the noise component derived from the reference signal is the same in the signal receiving unit 1 and the signal analyzing unit 2, the noise component is canceled by the frequency conversion in the frequency converting unit 25 of the signal analyzing unit 2.
Each channel signal frequency-converted to the original frequency is adjusted in amplitude and the like by the signal conversion unit 21 and analyzed by the control / analysis unit 22.
In this way, the operation of the first device is performed.

[Effect of the first embodiment]
According to the signal reception analyzing apparatus according to the first embodiment of the present invention, the plurality of frequency dividers 17 of the signal receiving unit 1 and the plurality of frequency dividers 29 of the signal analyzing unit 2 are used as the reference of the signal analyzing unit 2. The reference signal generated by the signal generation unit 26 is divided by a division value set in advance according to the channel, and the frequency input from the frequency divider 17 corresponding to the frequency conversion unit 12 of the signal reception unit 1 is obtained. The frequency conversion unit 25 of the signal analysis unit 2 performs frequency conversion to return to the original frequency using the frequency input from the corresponding frequency divider 29, so that the signal reception unit 1 and By performing frequency conversion using a frequency signal having the same noise characteristics as the signal analysis unit 2, it is possible to cancel the noise and reduce signal quality degradation due to noise.

[Second Embodiment: FIG. 2]
Next, a signal reception analysis apparatus (second apparatus) according to a second embodiment of the present invention will be described with reference to FIG. FIG. 2 is a block diagram showing the configuration of the signal reception analysis apparatus according to the second embodiment of the present invention.
If the distance between the signal receiving unit 1 and the signal analyzing unit 2 is within a few meters, it is not necessary to consider the delay difference due to transmission delay, but if the spatial distance becomes longer, the influence cannot be ignored. The second device can reduce noise with high accuracy even if the distance between the signal receiving unit 1 and the signal analyzing unit 2 is long in consideration of the delay.
As shown in FIG. 2, the basic configuration and operation of the second device are the same as those of the first device, and the description of the portions denoted by the same reference numerals is omitted.

A characteristic part of the second device will be described.
In the second apparatus, the signal analysis unit 2 includes a delay adjustment unit 30 that delays the signal from the reference signal generation unit 26 and a distribution unit 31 that distributes the delayed reference signal to each frequency divider 29. Yes.
The delay time in the delay adjusting unit 30 is the time when the reference signal from the signal analyzing unit 2 is transmitted via the transmission path and received by the signal receiving unit 1, and the combined signal of the channel signal frequency-converted by the reference signal Is set in consideration of the time until the signal analyzer 2 receives the signal.
As a result, even if the distance between the signal receiving unit 1 and the signal analyzing unit 2 is increased, the signal analyzing unit 2 can perform frequency conversion using the frequency signal synchronized with the signal receiving unit 1, and the noise reduction can be accurately performed. It can be done well.

The reference signal output from the reference signal generation unit 26 is output to the value spread adjustment unit 30 and the band pass filter 28 by the distribution unit 27, and the reference signal input to the band pass filter 28 is the same as that of the first device. Similarly, the band is limited and transmitted via the transmission path.
The reference signal input to the delay adjusting unit 30 is delayed for a predetermined time and then output to each divided period 29 via the distributor 31.
As a result, the reference signal used for frequency conversion is synchronized between the signal receiving unit 1 and the signal analyzing unit 2, and noise can be canceled with high accuracy.

[Effect of the second embodiment]
According to the signal reception analysis device according to the second exemplary embodiment of the present invention, the signal analysis unit 2 includes a delay adjustment unit 30 that delays the reference signal from the reference signal generation unit 26 by a time corresponding to the transmission delay; Since the distribution unit 31 that distributes the delayed reference signal to each frequency divider 29 is provided, the reference signal used in the frequency conversion in the signal reception unit 1 and the signal analysis unit 2 can be synchronized, and the signal reception Even if the distance between the unit 1 and the signal analysis unit 2 is increased, the noise can be sufficiently reduced.

[Third Embodiment: FIG. 3]
Next, a signal reception analyzing apparatus (third apparatus) according to the third embodiment of the present invention will be described with reference to FIG. FIG. 3 is a block diagram showing the configuration of the signal reception analysis apparatus according to the third embodiment of the present invention.
As shown in FIG. 3, the third device is provided with a variable bandpass filter 14'24 'instead of the bandpass filters 14 and 24, the passbands of the variable bandpass filters 14' and 24 ', and the frequency divider. The frequency division values at 17 and 29 are dynamically controlled by a control signal from the control / analysis unit 25.
The basic configuration and operation of the third device are the same as those of the first and second devices, and a description thereof will be omitted.

A characteristic part of the third device will be described.
The signal analysis unit 2 of the third device makes the characteristics of the bandpass filter variable according to the signal generation source and the type of signal to be received, and is variable instead of the bandpass filter 24 of the first device. A band pass filter 24 ′ is provided, a frequency divider 29 ′ is provided instead of the frequency divider 29, and a control signal modulation unit 32 and a band pass filter 33 are further provided. The operation of the control / analysis unit 22 'is partially different from that of the first device.

  The signal receiving unit 1 of the third device includes a variable bandpass filter 14 'instead of the bandpass filter 14 of the first device, a frequency divider 17' instead of the frequency divider 17, and A band pass filter 18, a demodulator 19, and a controller 20.

  Similar to the first and second devices, the control / analysis unit 22 ′ of the signal analysis unit 2 analyzes the input signal and outputs a result, controls the signal conversion unit, As a feature of the apparatus, frequency division value / band control information for instructing the frequency division value of the frequency divider and the pass band of the variable band pass filter is generated for each channel based on an instruction from the outside.

At this time, the control / analysis unit 22 ′ holds the channel number, the frequency division value, and the pass band in association with each other, and the frequency divider 29 ′ and the variable band pass filter 24 ′ of the signal analysis unit 2 are associated with each other. Sets the frequency division value or pass band corresponding to the channel number individually.
Further, as an instruction to the signal receiving unit 1, the frequency division value and the pass band corresponding to the channel number are written in the frequency division value / band control information as control information.

The control signal modulation unit 32 modulates a specific frequency different from the reference signal or the frequency-modulated reception signal using the frequency division value / band control information output from the control / analysis unit 22 ′, thereby dividing the frequency value. / Band control signal.
The band pass filter 33 band-limits the divided value / band control signal and outputs it to the transmission / reception unit.

Further, each frequency divider 17 ′ of the signal receiving unit 1 divides the reference signal by the frequency division value instructed from the control unit 20.
Each variable bandpass filter 14 ′ limits the band of the input signal with a band designated by the control unit 20 as a passband.

Further, the band pass filter 15 of the signal receiving unit 1 extracts a reference signal from the superimposed received signal.
The band pass filter 18 extracts the divided value / band control signal from the superimposed received signal.
The demodulator 19 performs demodulation corresponding to the modulation in the control signal modulator 32 of the signal analyzer 2 and outputs the divided value / band control information.
Based on the divided value / band control information, the control unit 20 sets a divided value corresponding to the channel number to each frequency divider 17 ', and sets the variable band pass filter 14' to the pass band corresponding to the channel number. Set.

[Operation of Third Device]
In the third apparatus, when changing the pass band of the variable band pass filters 14 and 24 in accordance with the type of the signal generation source and the received signal from the outside, the control / analysis unit 22 ′ of the signal analysis unit 2 inputs from the outside. The channel number and the corresponding frequency division value and pass band are stored as frequency division value / band control information.
Then, the control / analysis unit 22 ′ sends the frequency division value and the pass corresponding to the channel number to the frequency divider 29 ′ and the variable band pass filter 24 ′ of the signal analysis unit 2 based on the frequency division value / band control information. Set each band.

  At the same time, the control / analysis unit 22 ′ outputs the frequency division value / band control information to the control information modulation unit 32, and the frequency division value / band control information is modulated by the control information modulation unit 32, and the frequency division value / band control information is modulated. It becomes a control signal, band-limited by the band-pass filter 33, and transmitted to the signal receiving unit 1 by being superimposed on the reference signal from the band-pass filter 28 by the transmission / reception unit.

In the signal receiving unit 1, the received signal is distributed to the band pass filters 15 and 18 by the transmission / reception unit, and the reference signal is taken out by the band pass filter 15 and output to each frequency divider 17 via the distribution unit 16.
Further, the band-pass filter 18 takes out the divided value / band control signal, demodulates it by the demodulator 19, and inputs the acquired divided value / band control information to the controller 20.
Based on the divided value / band control information, the control unit 20 sets a divided value corresponding to the channel number in the frequency divider 17 and sets a pass band corresponding to the channel number in the variable band pass filter 14 ′. .

The received signal from the signal generation source is amplified for each channel, frequency-converted by the frequency converter 12 using the frequency from the frequency divider 17, and then band-limited by the variable bandpass filter 14 ′ for N channels. Are combined and transmitted to the signal analysis unit 2, where the received signal is distributed and band-limited by each variable bandpass filter 24 ′ for each channel, and the frequency conversion unit 25 outputs the signal from the frequency divider 29. Frequency conversion is performed using the frequency, signal conversion is performed by the signal conversion unit 21, and analysis is performed by the control / analysis unit 22.
In this way, the operation in the third device is performed.

Instead of controlling the variable bandpass filter 14 with the control information, the bandpass filter of each channel is manually replaced with one having appropriate characteristics according to the type of signal generation source or received signal, and the control / analysis unit The frequency division value control information for controlling only the frequency division value according to the pass band of each channel may be output from 22 '.
Similarly to the second apparatus, the signal analysis unit 2 may include a delay unit that delays the reference signal.

[Effect of the third embodiment]
According to the signal reception analysis apparatus according to the third embodiment of the present invention, the signal reception unit 1 and the signal analysis unit 2 are provided with variable bandpass filters 14 'and 24', and the control / analysis unit 22 ' A frequency division value and a pass band corresponding to the number are stored as frequency division value / band control information, a pass band is set in the variable band pass filter 24 ′ based on the frequency division value / band control information, and a frequency divider The frequency division value is set to 29, and the frequency division value / band control information is modulated and transmitted to the signal receiving unit 1, and demodulated by the signal receiving unit 1 to extract the frequency division value / band control information. 20 sets the frequency division value and the pass band in the frequency divider 17 and the variable band pass filter 14 'based on the frequency division value / band control information. Change the passband accordingly and change the division value accordingly. Constant to an effect capable of reducing the signal quality degradation due to noise.

  The present invention is suitable for a signal reception analysis apparatus that can reduce signal quality degradation due to phase noise or the like.

  DESCRIPTION OF SYMBOLS 1 ... Signal receiving part, 2 ... Signal analysis part, 3 ... Signal generation source, 11 ... Amplification part, 12 ... Frequency conversion part, 14 ... Band-pass filter, 14 '... Variable band-pass filter, 15 ... Band-pass filter, 16 DESCRIPTION OF SYMBOLS ... Distribution part, 17 ... Frequency divider, 18 ... Band pass filter, 19 ... Demodulation part, 20 ... Control part, 21 ... Signal conversion part, 22 ... Control / analysis part, 24 ... Band pass filter, 25 ... Frequency conversion part , 26: reference signal generation unit, 27: distribution unit, 28: band pass filter, 29 ... frequency divider, 30 ... delay adjustment unit, 31 ... distribution unit, 32 ... control signal modulation unit, 33 ... band pass filter

Claims (1)

A signal receiving unit for branching a received radio signal into a plurality of channels, performing a first frequency conversion for converting to a different frequency for each channel, combining the converted signals, and outputting the result via a transmission path; A signal that receives a composite signal via the transmission path, branches to the plurality of channels, performs a second frequency conversion for converting the original frequency for each channel, and analyzes the converted signal A signal reception analysis device comprising an analysis unit,
The signal analysis unit generates a reference signal that is a specific frequency signal, a distribution unit that distributes the reference signal into a plurality, and a transmission that transmits the distributed reference signal to the signal reception unit A frequency divider that divides the distributed reference signal by a specific frequency division value corresponding to the channel, and a frequency output from the frequency divider for each channel. A frequency conversion unit that performs the second frequency conversion;
The signal receiving unit includes a receiving unit that receives the reference signal through the transmission path, and a distributing unit that distributes the reference signal, and the distributed reference signal is determined according to the channel for each channel. And a frequency converter that performs frequency conversion using the frequency output from the frequency divider, and a frequency converter that performs the first frequency conversion using the frequency output from the frequency divider.

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