JP2014241564A - Reception device and reception signal processing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain normal operation regardless of the presence of a no-signal interval, when performing band division and band coupling of a reception signal.SOLUTION: A reception signal is passed through a band-pass filter corresponding to each of a plurality of different frequency bands. Therefore, the reception signal is divided into divided band signals for each of the plurality of frequency bands, a frequency of each of the divided band signals is converted and a conversion frequency signal is outputted and inputted to each of the band-pass filters in place of the reception signal. On the basis of a training signal outputted from a circuit including a circuit part corresponding to frequency conversion, frequency characteristics of the circuit corresponding to each of the plurality of frequency bands are measured and while utilizing the frequency characteristics of the circuit which are measured correspondingly to each of the plurality of frequency bands, the conversion frequency signal is corrected for each of the plurality of frequency bands. The corrected conversion frequency signals are coupled in accordance with the frequency bands.

Description

  The present invention relates to a receiving apparatus and a received signal processing method.

  The frequency demand is increasing with the spread of wireless communication systems such as mobile phone communication networks and wireless local area networks (LANs). However, since frequency bands are densely allocated depending on the frequency band, it is difficult to secure a new frequency band. Therefore, a technique for improving the frequency utilization efficiency by using the allocated frequency band in space or time has been studied.

In realizing the above-described technique, for example, sensing for detecting an available frequency band is performed. A receiving device that performs such sensing involves processing of band division (band division) of a received signal obtained by receiving a wide-band radio wave and signal combination (band combination) for each divided band.
In the band division and band combination of the received signal, the signal of each divided band is corrected. For the correction, known information such as a preamble defined in the wireless system, or a signal component of an overlapping band at the time of the band division is used. (For example, refer to Patent Documents 1 and 2).

JP 2010-45672 A JP 2012-191377 A

  As described above, known information used for correcting a signal for each divided band and signal components in a band that overlaps during band division are part of the received signal. For this reason, for example, when performing band division and band combination on a regular basis, correct correction operation can be obtained in a signal period in which a received signal exists, but in a non-signal period in which no signal is received. Incorrect correction is performed, and the band-coupled signal is distorted.

  The present invention has been made in view of such circumstances, and it is an object of the present invention to obtain normal operation regardless of the existence of no-signal sections when performing band division and band combination of received signals. .

One aspect of the present invention is a band dividing unit that divides the received signal into divided band signals for a plurality of frequency bands by passing the received signals through band pass filters corresponding to a plurality of different frequency bands; A frequency converter that converts each frequency of the band signal and outputs a converted frequency signal, and a training that is input to each of the bandpass filters instead of the received signal and is output from a circuit including the frequency converter A characteristic measuring unit that measures frequency characteristics of a circuit corresponding to each of the plurality of frequency bands based on a signal;
Using the frequency characteristics of the circuit measured corresponding to each of the plurality of frequency bands, the conversion frequency signal is corrected for each of the plurality of frequency bands, and the corrected conversion frequency signals are combined according to each frequency band. And a band combiner.

  One aspect of the present invention is the above-described reception device, further including a training signal generation unit that generates the training signal and inputs the training signal to each of the bandpass filters.

  One aspect of the present invention is the above-described reception device, wherein the characteristic measurement unit is input to each of the bandpass filters instead of the reception signal, and is output from a circuit including the frequency conversion unit. Based on the signal, at least one of the frequency characteristics of the circuit for each of the plurality of frequency bands is updated.

  One aspect of the present invention is the above-described reception device, wherein the characteristic measurement unit is input to each of the bandpass filters instead of a reception signal, and is output from a circuit including the frequency conversion unit. Based on a signal of predetermined known information included in the signal, at least one of the frequency characteristics of the circuit for each of the plurality of frequency bands is updated.

  One aspect of the present invention is the above-described receiving apparatus, wherein the received signal is passed through bandpass filters corresponding to a plurality of different frequency bands, thereby dividing the received signal into divided band signals for a plurality of frequency bands. A band dividing step, a frequency converting step for converting each frequency of the divided band signal and outputting a converted frequency signal, and input to each of the bandpass filters instead of the received signal, the frequency converting step A characteristic measurement step for measuring frequency characteristics of the circuit corresponding to each of the plurality of frequency bands based on a training signal output from a circuit including a circuit unit corresponding to the measurement, and measurement corresponding to each of the plurality of frequency bands Using the frequency characteristics of the corrected circuit, the conversion frequency signal is corrected for each of the plurality of frequency bands, and the corrected conversion frequency is corrected. A reception signal processing method and a band coupling step of coupling according to the respective frequency bands of No..

  As described above, according to the present invention, when performing band division and band combination of received signals, an effect is obtained that normal operation can be obtained regardless of the existence of no-signal sections.

It is a figure which shows the structural example of the receiver in this embodiment. It is a figure which mainly shows the operation example of the band coupling | bond part in the receiver of this embodiment. It is a figure which shows the training signal as a 1st example. It is a figure which shows the training signal as a 2nd example. It is a figure which shows the training signal as a 3rd example. It is a flowchart which shows the example of a process sequence which the receiver in this embodiment performs.

  FIG. 1 shows a configuration example of a receiving apparatus in the present embodiment. The receiving apparatus shown in the figure performs sensing for detecting a frequency band that can be used for communication in a predetermined wide band, for example, and shows a part that performs band division and band combination for sensing. ing. Further, in the following description, the receiving apparatus exemplifies a case where the entire band of the received signal is divided into four bands.

  The receiving apparatus shown in FIG. 1 includes an antenna 101, a band dividing unit 102, a frequency converting unit 103, AD converters 105-1 to 105-4, a training signal generating unit 106, a characteristic measuring unit 107, and a band combining unit 108.

A predetermined wide-band radio wave received by the antenna 101 is input to the band dividing unit 102 as a received signal.
The band dividing unit 102 divides the received signal into divided band signals for a plurality of bands by passing the received signals through band pass filters corresponding to a plurality of different frequency bands (divided bands).
In the figure, four band-pass filters (BPF) 112-1 to 112-4 are provided corresponding to dividing the received signal into four divided bands. Each of the bandpass filters 112-1 to 112-4 has frequency characteristics that allow different frequency bands to pass through corresponding to each divided band.
In the following description, the bandpass filters 112-1 to 112-4 are referred to as a bandpass filter 112 unless otherwise distinguished.

A reception signal supplied from the antenna 101 is branched and input to each of the bandpass filters 112-1 to 112-4.
The reception signals input to the bandpass filters 112-1 to 112-4 are output from the bandpass filters 112-1 to 112-4 as signals of different frequency bands (divided band signals).
The divided band signals output from each of the bandpass filters 112-1 to 112-4 are input to the frequency conversion unit 103.

The frequency converting unit 103 converts each frequency of the divided band signal and outputs a converted frequency signal. For this reason, the frequency converter 103 corresponds to each of the four divided band signals output from the bandpass filters 112-1 to 112-4 and has different frequencies from the four mixers 113-1 to 113-4. Are provided with local oscillators 114-1 to 114-4 for outputting local signals S1 to S4.
The mixer 113-1 combines the divided band signal output from the bandpass filter 112-1 and the local signal S1 having a predetermined frequency output from the local oscillator 114-1, thereby to change the frequency of the divided band signal. For example, conversion is performed so as to shift in a lower direction (or higher direction) according to the frequency of the local signal S1. The divided band signal whose frequency is converted in this way is the converted frequency signal.
Similarly, the remaining mixers 113-2 to 113-4 are divided band signals output from the bandpass filters 112-2 to 112-4 and predetermined frequencies output from the local oscillators 114-2 to 114-4, respectively. By combining the local signals S2 to S4, for example, a converted frequency signal shifted in a lower direction according to the frequency of the local signals S2 to S4 is output.
In the following description, the mixers 113-1 to 113-4 will be referred to as the mixer 113 unless otherwise distinguished.

The converted frequency signals output from the mixers 113-1 to 113-4 are input to low-pass filters (LPF) 104-1 to 104-4, respectively.
The low-pass filters 104-1 to 104-4 remove unnecessary band components in the input converted frequency signal.
In the following description, the low-pass filters 104-1 to 104-4 are referred to as the low-pass filter 104 unless otherwise distinguished.

The AD converters 105-1 to 105-4 convert the analog conversion frequency signals from which unnecessary band components have been removed after passing through the low-pass filters 104-1 to 104-4 into digital signals, respectively.
In the following description, the AD converters 105-1 to 105-4 will be referred to as AD converters 105 unless otherwise distinguished.

The training signal generation unit 106 generates a training signal and inputs the training signal to each of the bandpass filters 112-1 to 112-4.
The training signal is input to each of the bandpass filters 112-1 to 112-4 instead of the received signal, and is output from a circuit including a circuit unit as the mixers 113-1 to 113-4 (frequency conversion unit 103). Signal. The training signal is input to the band-pass filters 112-1 to 112-4 when the characteristic measurement unit 107 measures the frequency characteristic (circuit frequency characteristic) of the circuit corresponding to each divided band.

In FIG. 1, as circuits for outputting the training signals input to the bandpass filters 112-1 to 112-4, low-pass filters 104-1 to 104-4 are added to the mixers 113-1 to 113-4. Examples are included. In this case, the characteristic measurement unit 107 measures the frequency characteristics of the circuit using the bandpass filter 112, the mixer 113, and the lowpass filter 104 corresponding to each divided band.
In addition to the mixers 113-1 to 113-4 and the low-pass filters 104-1 to 104-4, the circuit that outputs the training signals input to the band-pass filters 112-1 to 112-4 is further provided. The AD converters 105-1 to 105-4 may be included. In this case, the characteristic measurement unit 107 measures the frequency characteristics of the circuit by the band pass filter 112, the mixer 113, the low pass filter 104, and the AD converter 105.

The characteristic measuring unit 107 measures the circuit frequency characteristic for each divided band based on the training signal output from the circuit to which the training signal is output.
Specifically, in correspondence with FIG. 1, the characteristic measurement unit 107 uses the bandpass filter 112-1, the mixer 113-1, and the lowpass filter 104-1 based on the training signal output from the lowpass filter 104-1. Measure the frequency characteristics of the circuit.
Further, the characteristic measuring unit 107 measures the frequency characteristics of the circuit by the bandpass filter 112-2, the mixer 113-2, and the lowpass filter 104-2 based on the training signal output from the lowpass filter 104-2.
Further, the characteristic measuring unit 107 measures the frequency characteristics of the circuit using the bandpass filter 112-3, the mixer 113-3, and the lowpass filter 104-3 based on the training signal output from the lowpass filter 104-3.
Further, the characteristic measuring unit 107 measures the frequency characteristics of the circuit by the bandpass filter 112-4, the mixer 113-4, and the lowpass filter 104-4 based on the training signal output from the lowpass filter 104-4.

  The band combiner 108 corrects the converted frequency signal for each divided band using the circuit frequency characteristic for each divided band measured by the characteristic measuring unit 107, and combines the corrected converted frequency signal according to each frequency band.

FIG. 2 mainly shows an operation example of the band combining unit 108 in the receiving apparatus shown in FIG.
As shown in the figure, the received signal received by the antenna 101 includes, for example, four bands of frequency bands F1, F2, F3, and F4. Corresponding to this, the band dividing unit 102 divides the received signal into respective divided band signals in the frequency bands F1, F2, F3, and F4. Here, the frequency bands F1, F2, F3, and F4 correspond to the pass bands of the bandpass filters 112-1, 112-2, 112-3, and 112-4, respectively.
In each Bode diagram in the figure, the horizontal axis f represents frequency and the vertical axis p represents power.

  The band combiner 108 corrects by inputting the converted frequency signals in the frequency bands F1s, F2s, F3s, and F4s obtained by converting the frequencies of the divided band signals in the frequency bands F1, F2, F3, and F4 by the frequency converter 103. Do. Thereby, the band coupling unit 108 obtains correction signals in the frequency bands F1s, F2s, F3s, and F4s.

The band coupling unit 108 uses the circuit frequency characteristic measured by the characteristic measurement unit 107 corresponding to each of the frequency bands F1s, F2s, F3s, and F4s during the above correction.
Here, the circuit frequency characteristic corresponding to the frequency band F1s is a frequency characteristic of the circuit formed by the bandpass filter 112-1, the mixer 113-1, and the lowpass filter 104-1.
The circuit frequency characteristic corresponding to the frequency band F2s is a frequency characteristic of the circuit formed by the band pass filter 112-2, the mixer 113-2, and the low pass filter 104-2.
The circuit frequency characteristic corresponding to the frequency band F3s is a frequency characteristic of a circuit formed by the band pass filter 112-3, the mixer 113-3, and the low pass filter 104-3.
The circuit frequency characteristic corresponding to the frequency band F4s is the frequency characteristic of the circuit formed by the band pass filter 112-4, the mixer 113-4, and the low pass filter 104-4.

That is, the band coupling unit 108 corrects the converted frequency signal output from the low-pass filter 104-1, using the circuit frequency characteristic corresponding to the frequency band F1s.
In addition, the band coupling unit 108 corrects the converted frequency signal output from the low-pass filter 104-2 using circuit frequency characteristics corresponding to the frequency band F2s.
The band coupling unit 108 corrects the converted frequency signal output from the low-pass filter 104-3 using circuit frequency characteristics corresponding to the frequency band F3s.
The band coupling unit 108 corrects the converted frequency signal output from the low-pass filter 104-4 using the circuit frequency characteristic corresponding to the frequency band F4s.

  Next, the band combiner 108 extracts a signal to be combined for each correction signal in the frequency bands F1s, F2s, F3s, and F4s. For example, as shown in the figure, extraction of the signal to be combined is performed by removing band components that overlap (interfer) with adjacent frequency bands in the correction signals of the frequency bands F1s, F2s, F3s, and F4s. it can.

  Next, the band combiner 108 combines the signals to be combined in the frequency bands F1s, F2s, F3s, and F4s extracted as described above according to the respective frequency bands, and generates a combined signal as shown in FIG.

Here, the circuit frequency characteristic for each divided band used when the band combiner 108 corrects the converted frequency signal for each divided band is measured by the following operation.
That is, the training signal generation unit 106 generates a training signal in advance prior to performing band division and band combination of the received signal, and a circuit (bandpass) corresponding to each of the frequency bands F1, F2, F3, and F4. The filter 112, the mixer 113, and the low-pass filter 104) are passed.
Then, the characteristic measuring unit 107 outputs the training signal after passing through the circuit output from the low-pass filters 104-1 to 104-4 corresponding to the frequency bands F1, F2, F3, and F4, and the training signal generating unit 106. The training signal before passing through the circuit is input.

Here, the training signal after passing through the circuit changes so that the frequency characteristics of the circuits (bandpass filter 112, mixer 113, lowpass filter 104) are added to the training signal before passing through the circuit.
Therefore, the characteristic measuring unit 107 determines the frequency bands F1, F2, F3, and F3 based on the difference between the training signal before passing through the circuit and the training signal after passing through the circuit corresponding to each of the frequency bands F1, F2, F3, and F4. The circuit frequency characteristic corresponding to each F4 is measured.
The characteristic measurement unit 107 outputs circuit frequency characteristics corresponding to the measured frequency bands F1, F2, F3, and F4 to the band coupling unit 108.

The band coupling unit 108 stores circuit frequency characteristics corresponding to the frequency bands F1, F2, F3, and F4 input from the characteristic measurement unit 107.
Thereafter, the receiving apparatus 100 performs band division and band combination processing on the received signal received by the antenna 101. At this time, the band combiner 108 corrects each divided band signal corresponding to the frequency bands F1, F2, F3, and F4 using circuit frequency characteristics corresponding to the frequency bands F1, F2, F3, and F4.

As described above, in the present embodiment, the circuit frequency characteristic used by the band combining unit 108 for correcting the converted frequency signal is measured using the training signal generated by the training signal generating unit 106. That is, in this embodiment, a highly reliable circuit frequency characteristic can be obtained without using a known signal (preamble) included in the received signal or a signal component in a band that overlaps between adjacent divided bands during band division. Can do.
That is, the correction of the circuit frequency characteristic in the present embodiment does not need to use information included in the received signal or a signal portion. Thereby, the band coupling unit 108 of the present embodiment can perform correction by a correct operation even in a no-signal section. As a result, for example, distortion in a state where the joints of the divided bands are discontinuous in the combined signal obtained by combining the correction signals is suppressed.

  In addition, in the present embodiment, by providing the training signal generation unit 106, the circuit frequency characteristics can be measured completely within the receiving apparatus 100 without inputting a training signal from the outside of the receiving apparatus 100.

Here, the training signal is preferably such that a measurement result of a circuit frequency characteristic that is as good as possible can be obtained. Therefore, three examples are given as training signals.
The training signal as the first example is an impulse signal. As shown in FIG. 3, the impulse signal is an infinite band signal.
Further, as shown in FIG. 4, the training signal as the second example is a signal in a wide frequency band including the frequency band of the reception signal in the frequency bands F1 to F4.
Further, as shown in FIG. 5, the training signal as the third example is a continuous wave (CW: Continuous Wave) at frequencies f1, f2, and f3 that overlap when the received signal is divided into bands.

The flowchart in FIG. 6 shows an example of a processing procedure executed by the receiving apparatus in this embodiment.
In response to the power supply of the receiving apparatus 100 being turned on in step S101 (step S101), the training signal generation unit 106 generates a training signal, and the generated training signal is converted into a bandpass filter 112-1 in the band dividing unit 102. To 112-4 (step S102).

Next, the characteristic measurement unit 107 uses the training signal for each different divided band output from each of the low-pass filters 104-1 to 104-4 and the training signal generated by the training signal generation unit 106 to perform division. The circuit frequency characteristic for each band is measured (step S103).
The characteristic measuring unit 107 stores the circuit frequency characteristic for each divided band measured in step S103 (step S104).

  Next, the band dividing unit 102 starts input of a received signal (step S105). Thereby, in subsequent receiving apparatuses 100, band division and band combination of received signals are continuously performed.

Then, the band combining unit 108 corrects the conversion frequency signal for each divided band output from each of the AD converters 105-1 to 105-4 when performing the band combining process corresponding to the received signal ( Step S106). By step S106, a correction signal for each divided band is obtained.
As described with reference to FIG. 2, the band combining unit 108 extracts a signal to be combined so as to remove, for example, band components that interfere with other adjacent divided bands from the correction signal for each divided band (step S107). .
The band combiner 108 combines the combination target signals extracted in step S107 according to the frequency band to generate a combined signal (step S108).

  Here, as described above, in the receiving apparatus according to the present embodiment, the circuit frequency characteristics are measured in advance using the training signal in steps S102 and S103 before processing the received signal. In addition, the measured circuit frequency characteristic is used for the correction in step S106. Thus, in the present embodiment, as described above, the band division and band combination processes are continuously executed not only in the section in which the received signal is obtained but also in the non-signal section in which the received signal is not obtained. However, a correct correction operation can be obtained.

In the receiving apparatus 100, since a change such as a temperature change or a secular change occurs in the circuit frequency characteristic, the circuit frequency characteristic for each divided band may be updated at a predetermined timing.
In this case, the characteristic measurement unit 107 is input instead of the reception signal to each of the bandpass filters 112-1 to 112-4, and based on the training signal output from the circuit including the frequency conversion unit 103, At least one of the circuit frequency characteristics for each divided band may be updated. When the update timing is periodically set in a period in which the amount of change does not exceed the error range according to the change speed of the circuit frequency characteristics, or when it is set in a no-signal interval that is periodically detected, the demodulation error rate of the received signal In some cases, it is updated as the number increases.
That is, the training signal generation unit 106 in this case causes the training signal to be input to the bandpass filter 112 corresponding to the division band to be updated in accordance with the update timing of the circuit frequency characteristic. The characteristic measuring unit 107 measures the circuit frequency characteristic using the training signal output from the low-pass filter 104 corresponding to the division band to be updated. The characteristic measuring unit 107 rewrites the circuit frequency characteristic measured by the circuit frequency characteristic stored by the band combining unit 108 corresponding to the same divided band. In this way, the characteristic measuring unit 107 updates the circuit frequency characteristic.

Further, the characteristic measuring unit 107 may update the circuit frequency characteristic based on a signal of predetermined known information such as a preamble included in the received signal.
In this case, the characteristic measuring unit 107 holds the ideal signal of the known information of the received signal held in advance and the known information signal of the received signal after passing through the circuit corresponding to each of the frequency bands F1, F2, F3, and F4. Based on the difference from the portion, the variation in amplitude and phase of the circuit frequency characteristic is estimated from the discontinuity of the joint of the divided band. Based on the estimated amount of change, the circuit frequency characteristic stored by the band combining unit 108 corresponding to the same divided band is rewritten with the circuit frequency characteristic reflecting the amount of change. In this way, the circuit frequency characteristics can be updated using known information included in the received signal.

  Although the embodiment has been described with reference to the drawings, the specific configuration is not limited to the embodiment described so far, and includes design and the like within the scope not departing from the gist of the present invention.

  DESCRIPTION OF SYMBOLS 100 ... Receiver, 101 ... Antenna, 102 ... Band division part, 103 ... Frequency conversion part, 104 ... Low pass filter, 105 ... AD converter, 106 ... Training signal generation part, 107 ... Characteristic measurement part, 108 ... Band combination part , 112 (112-1 to 112-4) ... band pass filter, 113 (113-1 to 113-4) ... mixer, 114 (114-1 to 114-4) ... local oscillator

One aspect of the present invention is a band dividing unit that divides the received signal into divided band signals for a plurality of frequency bands by passing the received signals through a plurality of band pass filters corresponding to a plurality of different frequency bands, A frequency converter that converts the frequency of each of the divided band signals and outputs a converted frequency signal; and a circuit that includes the frequency converter that is input to each of the plurality of bandpass filters instead of the received signal. Based on the output training signal, a characteristic measuring unit that measures the frequency characteristic of the circuit corresponding to each of the plurality of frequency bands, and the frequency characteristic of the circuit measured corresponding to each of the plurality of frequency bands are used. A band coupling unit that corrects the converted frequency signal for each of the plurality of frequency bands and combines the corrected converted frequency signals according to each frequency band. Wherein the frequency conversion unit, corresponding to each divided band signals output from each of the plurality of band pass filters, and outputs a plurality of mixers, the local signals of different frequencies from each other to the plurality of mixers a receiver Ru comprising a plurality of local oscillators.

One aspect of the present invention is the above-described reception device, further including a training signal generation unit that generates the training signal and inputs the training signal to each of the plurality of bandpass filters.

One aspect of the present invention is the above-described reception device, wherein the characteristic measurement unit is input instead of a reception signal to each of the plurality of bandpass filters, and is output from a circuit including the frequency conversion unit. And updating at least one of the frequency characteristics of the circuit for each of the plurality of frequency bands based on the training signal.

One aspect of the present invention is the above-described reception device, wherein the characteristic measurement unit is input instead of a reception signal to each of the plurality of bandpass filters, and is output from a circuit including the frequency conversion unit. At least one of the frequency characteristics of the circuit for each of the plurality of frequency bands is updated based on a signal of predetermined known information included in the received signal.

In one aspect of the present invention, the band dividing unit divides the received signal into divided band signals for a plurality of frequency bands by passing the received signals through a plurality of band pass filters corresponding to a plurality of different frequency bands. A band division step, a frequency conversion step in which a frequency conversion unit converts each frequency of the division band signal and outputs a converted frequency signal, and a characteristic measurement unit receives each of the plurality of bandpass filters. It is input instead of the signal, based on the training signal outputted from the circuit including the frequency conversion unit, and a characteristic measuring step of measuring the frequency characteristics of the circuit corresponding to each of the plurality of frequency bands, the band coupling portion, Using the frequency characteristics of the circuit measured corresponding to each of the plurality of frequency bands, the conversion frequency signal is corrected for each of the plurality of frequency bands. , And a band coupling step of coupling corrected converted frequency signals according to the respective frequency bands, said frequency converting step, each of the plurality of mixers in which the frequency converter is provided in, from each of said plurality of bandpass filters and outputted split-band signal, said a plurality of reception signal processing how to combine the local signal with each other in different frequency outputted from each of the local oscillator frequency converting unit is provided.

According to one aspect of the present invention, a plurality of bandpass filters including a band corresponding to a plurality of different frequency bands and having a passband overlapping with an adjacent frequency band are passed through the received signal. Received for each of the plurality of bandpass filters, a band dividing unit that divides the signal into divided band signals for each frequency band, a frequency converting unit that converts each frequency of the divided band signal and outputs a converted frequency signal A characteristic measurement unit that measures frequency characteristics of a circuit corresponding to each of the plurality of frequency bands based on a training signal that is input instead of a signal and that is output from a circuit including the frequency conversion unit; and the plurality of frequency bands Using the frequency characteristics of the circuit measured corresponding to each, the conversion frequency signal is corrected for each of the plurality of frequency bands, and the corrected conversion frequency is corrected. No. For, after removing the band components overlapping with adjacent frequency bands, and a band coupling portion for coupling to the same frequency relationship with the split-band signal after passing through the band-pass filter in accordance with the respective frequency bands, The frequency converting unit corresponds to each divided band signal output from each of the plurality of bandpass filters, and a plurality of local units that output local signals of different frequencies to the plurality of mixers. A receiving apparatus including an oscillator.

According to an aspect of the present invention, the band dividing unit allows the received signal to pass through a plurality of bandpass filters that include a band that corresponds to each of a plurality of different frequency bands and a pass band overlaps with an adjacent frequency band. A band dividing step for dividing the received signal into divided band signals for each of a plurality of frequency bands; a frequency converting step for converting a frequency of each of the divided band signals and outputting a converted frequency signal; and a characteristic measurement. Unit is input to each of the plurality of bandpass filters instead of the received signal, and based on a training signal output from a circuit including the frequency conversion unit, a circuit corresponding to each of the plurality of frequency bands A characteristic measurement step for measuring frequency characteristics, and a band combiner uses the frequency characteristics of the circuit measured corresponding to each of the plurality of frequency bands. Te, corrects the converted frequency signals for each of the plurality of frequency bands, the corrected conversion frequency signal, after removal of the band components overlapping with adjacent frequency band after passing through the band-pass filter in accordance with respective frequency bands A band combining step for combining the divided band signals so as to have the same frequency relationship as each of the divided band signals , wherein each of the plurality of mixers included in the frequency conversion unit outputs from each of the plurality of bandpass filters. This is a received signal processing method for combining the divided band signal and the local signals of different frequencies output from each of the plurality of local oscillators provided in the frequency converter.

Claims (5)

A band dividing unit that divides the received signal into divided band signals for a plurality of frequency bands by passing the received signal through band pass filters corresponding to a plurality of different frequency bands;
A frequency converter that converts the frequency of each of the divided band signals and outputs a converted frequency signal;
Based on a training signal input to each of the band-pass filters instead of the received signal and output from a circuit including the frequency converter, the frequency characteristics of the circuit corresponding to each of the plurality of frequency bands are measured. A characteristic measuring unit;
Using the frequency characteristics of the circuit measured corresponding to each of the plurality of frequency bands, the conversion frequency signal is corrected for each of the plurality of frequency bands, and the corrected conversion frequency signals are combined according to each frequency band. A receiving device comprising: a band combiner. The receiving device according to claim 1, further comprising a training signal generation unit that generates the training signal and inputs the training signal to each of the bandpass filters. The characteristic measuring unit is
At least one of the frequency characteristics of the circuit for each of the plurality of frequency bands based on a training signal that is input to each of the band-pass filters instead of the received signal and is output from the circuit including the frequency conversion unit. The receiving device according to claim 1, wherein the receiving device is updated. The characteristic measuring unit is
For each of the plurality of frequency bands, based on a signal of predetermined known information that is input to each of the bandpass filters instead of the reception signal and is included in the reception signal that is output from the circuit that includes the frequency converter. The receiving apparatus according to claim 1, wherein at least one of the frequency characteristics of the circuit is updated. A band dividing step of dividing the received signal into divided band signals for a plurality of frequency bands by passing the received signals through band pass filters corresponding to a plurality of different frequency bands;
A frequency conversion step of converting each frequency of the divided band signal and outputting a converted frequency signal;
A circuit corresponding to each of the plurality of frequency bands is input to each of the band-pass filters instead of a reception signal and based on a training signal output from a circuit including a circuit unit corresponding to the frequency conversion step. A characteristic measurement step for measuring frequency characteristics;
Using the frequency characteristics of the circuit measured corresponding to each of the plurality of frequency bands, the conversion frequency signal is corrected for each of the plurality of frequency bands, and the corrected conversion frequency signals are combined according to each frequency band. A received signal processing method comprising: a band combining step.

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