WO2011086609A1 - Appareil de réception de diffusion numérique et procédé de génération de profil de retard - Google Patents

Appareil de réception de diffusion numérique et procédé de génération de profil de retard Download PDF

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Publication number
WO2011086609A1
WO2011086609A1 PCT/JP2010/000235 JP2010000235W WO2011086609A1 WO 2011086609 A1 WO2011086609 A1 WO 2011086609A1 JP 2010000235 W JP2010000235 W JP 2010000235W WO 2011086609 A1 WO2011086609 A1 WO 2011086609A1
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Prior art keywords
delay profile
unit
fourier transform
time
value
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PCT/JP2010/000235
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English (en)
Japanese (ja)
Inventor
村田聡
梅野良輔
竹内満
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三菱電機株式会社
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Priority to JP2011549751A priority Critical patent/JP4926307B2/ja
Priority to CN201080053009.9A priority patent/CN102668426B/zh
Priority to PCT/JP2010/000235 priority patent/WO2011086609A1/fr
Priority to DE112010005148.8T priority patent/DE112010005148B4/de
Publication of WO2011086609A1 publication Critical patent/WO2011086609A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H04J11/0063—Interference mitigation or co-ordination of multipath interference, e.g. Rake receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0212—Channel estimation of impulse response
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/022—Channel estimation of frequency response
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H04L25/0228—Channel estimation using sounding signals with direct estimation from sounding signals
    • H04L25/023—Channel estimation using sounding signals with direct estimation from sounding signals with extension to other symbols
    • H04L25/0232—Channel estimation using sounding signals with direct estimation from sounding signals with extension to other symbols by interpolation between sounding signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2668—Details of algorithms
    • H04L27/2681—Details of algorithms characterised by constraints
    • H04L27/2688—Resistance to perturbation, e.g. noise, interference or fading
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
    • H04L27/2695—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation with channel estimation, e.g. determination of delay spread, derivative or peak tracking
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/005—Allocation of pilot signals, i.e. of signals known to the receiver of common pilots, i.e. pilots destined for multiple users or terminals

Definitions

  • the present invention relates to a digital broadcast receiving apparatus and a delay profile creating method for receiving a digital broadcast wave using an OFDM (Orthogonal Frequency Division Multiplexing) system.
  • OFDM Orthogonal Frequency Division Multiplexing
  • information to be transmitted is allocated to a plurality of subcarriers and digitally modulated on each subcarrier.
  • the digital modulation method include a QPSK (Quadrature Phase Shift Keying) method, a QAM (Quadrature Amplitude Modulation) method, a multilevel PSK (Phase Shift Keying) method, and the like.
  • a known signal is multiplexed on a specific subcarrier, and on the receiving side, the subcarrier is demodulated using this known signal.
  • subcarriers that multiplex known signals are orthogonally transformed by inverse Fourier transform processing and frequency-converted to a desired transmission frequency before being transmitted.
  • a transmission unit on which the inverse Fourier transform process is performed is called a symbol.
  • the last part of the signal after the inverse Fourier transform process is copied and added to the head of the symbol. This added portion is called a guard interval, and even if there is an incoming wave having a delay time equal to or shorter than the guard interval length, a signal can be reproduced without interference between symbols on the receiving side.
  • the scattered pilot is taken as an example of the ISDB-T system which is a domestic terrestrial digital broadcasting and the DVB-T system adopted in Europe.
  • SP signal a signal
  • This SP signal is periodically inserted into the transmission signal.
  • the reception side has in advance the value of each SP signal periodically inserted into the transmission signal as a known SP signal, and the amplitude of each SP signal is obtained by dividing the received SP signal by the known SP signal.
  • transmission path characteristics a phase fluctuation amount
  • transmission path estimation a delay profile indicating the intensity of the received signal for each arrival time can be obtained.
  • the delay profile obtained from the transmission path characteristic value is referred to as an SP-based delay profile.
  • Another method for obtaining the delay profile is to use the power spectrum of the received signal (see, for example, Patent Document 1).
  • a received signal is squared in the frequency domain, converted into a power dimension, and then subjected to inverse Fourier transform to obtain a delay profile.
  • this delay profile is called a power-based delay profile.
  • the power-based delay profile when the effective symbol length is Ts, the maximum delay time in which an incoming wave can be detected is Ts / 2, which is a time range longer than ⁇ Ts / 6 in the SP-based delay profile.
  • the power-based delay profile has a problem that the relative time difference between the preceding wave and the delayed wave with respect to the main wave cannot be obtained, and the preceding wave and the delayed wave cannot be distinguished.
  • there are a plurality of incoming waves there is a problem that intermodulation occurs due to interference between the incoming waves, and an incoming wave that does not exist originally appears on the delay profile.
  • Patent Document 2 discloses an OFDM wave delay profile measuring apparatus that uses a combination of a delay profile based on the transfer function method corresponding to the SP base delay profile described above and a delay profile based on the power spectrum method corresponding to the power base delay profile. It is disclosed. In this apparatus, by using both delay profiles, in the delay profile measurement method, the length of the maximum delay time in which the delay wave can be measured, the time resolution in which the delay wave can be measured, the level in which the delay wave can be measured, The accuracy of the delay wave level and the false pulse response can be eliminated.
  • the present invention has been made to solve the above-described problems, and is an environment in which a mobile body equipped with the mobile device moves at high speed, or has a time range in which an incoming wave can be detected with an SP-based delay profile.
  • An object of the present invention is to provide a digital broadcast receiving apparatus and a delay profile creating method capable of providing an error-free delay profile to eliminate erroneous control and improving reception performance even when there are exceeding arriving waves.
  • a digital broadcast receiver includes a Fourier transform unit that performs Fourier transform on a received orthogonal frequency division multiplex signal for each transmission unit, and subcarrier power data that is calculated from data Fourier-transformed by the Fourier transform unit.
  • a power calculation unit, a first inverse Fourier transform unit that generates a first delay profile by performing an inverse Fourier transform on the subcarrier power data calculated by the subcarrier power calculation unit, and a Fourier transform performed by the Fourier transform unit A pilot signal extraction unit that extracts a pilot signal from data, a division unit that calculates transmission path characteristic data for the pilot signal of each transmission unit by dividing the pilot signal extracted by the pilot signal extraction unit by a known value; To the pilot signal of each transmission unit calculated by the division unit A time direction interpolation unit for interpolating transmission line characteristic data in the time direction, and generating a second delay profile by performing inverse Fourier transform on the transmission line characteristic data interpolated in the time direction by the time direction interpolation unit Main wave arrival times of the second inverse Fourier
  • an error-free delay profile can be provided to eliminate erroneous control and improve reception performance.
  • FIG. 10 is a flowchart showing a flow of operation by a delay profile synthesis unit according to the second embodiment.
  • FIG. 10 is an explanatory diagram for explaining delay profile synthesis processing according to Embodiment 3; It is a block diagram which shows the structure of the digital broadcast receiver by Embodiment 4 of this invention. It is a block diagram which shows the structure of the digital broadcast receiver by Embodiment 5 of this invention.
  • FIG. 1 is a diagram showing an arrangement pattern of SP signals in a transmission signal.
  • Black circle symbols in FIG. 1 indicate SP signals, and white circle symbols indicate signals such as data.
  • the SP signals are distributed for every 4 symbols in the time direction and every 12 carriers in the frequency direction, and for each symbol so that their insertion positions are the same frequency position in a 4 symbol period. It is arranged while shifting 3 carriers at a time.
  • the received SP signal is divided by a known SP signal to estimate the channel characteristics of each SP signal.
  • FIG. 2 is a diagram showing the estimation result of the transmission path characteristic of the SP signal interpolated in the time direction.
  • the black circle symbol in FIG. 2 indicates the estimated value of the transmission path characteristic of the SP signal, and the black triangle symbol is The estimated value of the transmission path characteristic interpolated in the time direction is shown, and the white circle symbol indicates a signal such as data.
  • FIG. 3 is a diagram showing the estimation results of the SP signal transmission path characteristics interpolated in the time direction and the frequency direction, and the black circle symbols in FIG. 3 indicate the SP signal transmission path characteristic estimation values.
  • the black triangle symbol indicates the estimated value of the transmission path characteristic interpolated in the time direction
  • the black square symbol indicates the estimated value of the transmission path characteristic interpolated in the frequency direction.
  • the estimated values of the SP signal transmission path characteristics are interpolated in the time direction as shown in FIG. 2, and then further interpolated in the frequency direction as shown in FIG. It is possible to obtain road characteristics.
  • the transmission path estimation values are dispersed by 3 carriers in the frequency direction. For this reason, the time range in which the transmission path characteristics can be estimated is expanded from Ts / 12 to Ts / 3, and even in an environment where the arrival time difference of the incoming waves is large, the transmission path is correctly within the expanded time range.
  • the characteristics can be estimated.
  • FIG. 4 is a diagram showing an example of the SP base delay profile.
  • a delay profile (SP base delay profile) indicating the intensity of each received signal as shown in FIG. 4 is obtained.
  • the main wave is an incoming wave having the highest level among a plurality of incoming waves included in the received signal.
  • a main wave delay wave or a preceding wave (not shown in FIG. 4) is generated.
  • a moving body for example, a vehicle
  • the received signal of the receiving device undergoes Doppler fluctuations, and the transmission path characteristics for each symbol vary.
  • FIG. 5 is a diagram showing estimation results of transmission path characteristics including errors by interpolation in the time direction.
  • the black circle symbol in FIG. 5 indicates the estimated value of the transmission path characteristics of the SP signal, and the cross symbol is the time direction.
  • the estimated values of the transmission path characteristics including errors are shown by interpolation, and white circles indicate signals such as data.
  • the maximum frequency (also referred to as the maximum Doppler frequency) of transmission path characteristic fluctuation due to Doppler fluctuation exceeds 1 / ((Ts + Tg) / 8) (Hz), which is the maximum frequency that can be interpolated by interpolation in the time direction. Then, as shown in FIG. 5, the transmission path characteristic includes an error, and interpolation in the time direction cannot be performed correctly.
  • Ts is the effective symbol length
  • Tg is the guard interval length
  • the above equation indicating the maximum frequency that can be interpolated by interpolation is derived from the sampling theorem and the SP signal interpolated in a 4-symbol period.
  • FIG. 6 is a diagram showing an SP base delay profile and a pseudo incoming wave generated in the SP base delay profile.
  • FIG. 6 shows the SP base delay profile obtained from the estimation result of the transmission path characteristics in which the interpolation in the time direction is erroneously performed as shown in FIG. 5 due to the high-speed movement of the mobile body equipped with the receiving apparatus.
  • FIG. 7 is a diagram illustrating an example of a problem caused by a delayed wave exceeding the detection range in the SP base delay profile.
  • the arrival wave is within the detection range from the original delay time on the delay profile. It appears as a return signal that returns as a signal. For this reason, the arrival wave that was originally a delayed wave becomes like a preceding wave with respect to the main wave, and the preceding wave and the delayed wave cannot be distinguished.
  • the time range in which an incoming wave can be detected is up to Ts / 2, but only the relative time difference between the delayed wave and the preceding wave with respect to the main wave can be obtained. For this reason, as shown in FIG. 8, in the power-based delay profile, it is not possible to distinguish between the preceding wave and the delayed wave.
  • cross-modulation occurs due to interference between the incoming waves, and an originally existing incoming wave appears on the delay profile.
  • Patent Document 1 since the power-based delay profile is used, the above-described problem occurs.
  • the apparatus of Patent Document 2 uses a combination of an SP base delay profile and a power base delay profile, but uses an incoming wave that appears only in the SP base delay profile as a detection result. For this reason, the pseudo arrival wave on the SP-based delay profile that occurs during high-speed movement cannot be removed.
  • the receiving apparatus described in Patent Document 3 prevents false control by determining a pseudo incoming wave that occurs during high-speed movement, but has a limitation that the detection range of the incoming wave is ⁇ Ts / 6, and delay There is a possibility that erroneous control is performed for an incoming wave having a long time.
  • the error signal included in the SP base delay profile is canceled using the power base delay profile, and the SP base delay profile in which the error signal is canceled is used as an advantage of both delay profiles.
  • FIG. 9 is a block diagram showing the configuration of the digital broadcast receiving apparatus according to Embodiment 1 of the present invention.
  • a digital broadcast receiving apparatus 1 according to Embodiment 1 is a receiving apparatus that receives a digital broadcast wave using the OFDM method, and as shown in FIG. 9, a Fourier transform unit 2, a pilot signal extraction unit 3, a known signal, Generation unit 4, division unit 5, time direction interpolation unit 6, frequency direction interpolation unit 7, equalization unit 8, subcarrier power calculation unit 9, first inverse Fourier transform unit 10a, second inverse Fourier transform unit 10b and a delay profile synthesis unit 11.
  • the Fourier transform unit 2 is a configuration unit that generates a frequency axis signal by cutting out a time axis signal (a signal of a transmission unit) of one symbol period from a received signal and performing a Fourier transform. Perform transform (FFT; Fast Fourier Transform). By performing the Fourier transform, the received time axis signal is converted into a signal for each subcarrier which is a carrier unit of the frequency axis signal.
  • FFT Fast Fourier Transform
  • the pilot signal extraction unit 3 is a configuration unit that extracts the SP signal inserted at a predetermined subcarrier position from the signal for each subcarrier obtained by the Fourier transform unit 2.
  • the known signal generation unit 4 is a component that generates a known value of the SP signal corresponding to a predetermined subcarrier position from which the SP signal is extracted by the pilot signal extraction unit 3.
  • the SP signal having a known value is the value of the SP signal at the time of transmission, and is hereinafter referred to as a known SP signal.
  • the divider 5 is a component that obtains a transmission line characteristic value by dividing the value of the SP signal extracted by the pilot signal extractor 3 by the value of the known SP signal corresponding thereto.
  • the time direction interpolation unit 6 is a component that interpolates the transmission path characteristic value generated by the division unit 5 in the time direction, and uses linear interpolation or a FIR (Finite impulse response) filter of a plurality of symbols. Interpolate in the time direction. By performing interpolation processing in the time direction, a transmission path characteristic signal for every three carriers is obtained in the frequency direction as shown in FIG.
  • the frequency direction interpolation unit 7 performs a frequency direction interpolation process on the transmission line characteristic signal obtained by the time direction interpolation unit 6 using a linear interpolation or a FIR filter of a plurality of symbols. Part. By performing this frequency direction interpolation processing, the transmission path characteristics of all subcarriers can be obtained as shown in FIG.
  • the equalization unit 8 equalizes the received signal by dividing the signal for each subcarrier obtained by the Fourier transform unit 2 by the transmission path characteristic value for each subcarrier obtained by the frequency direction interpolation unit 7. It is a component.
  • a signal reproduction unit is provided at the subsequent stage of the equalization unit 8, and the signal reproduction unit reproduces original transmission data from the equalization result obtained by the equalization unit 8.
  • the subcarrier power calculation unit 9 is a component that calculates subcarrier power from the signal for each subcarrier obtained by the Fourier transform unit 2.
  • the first inverse Fourier transform unit 10 a is a component that generates a power-based delay profile (first delay profile) from the calculation result of the subcarrier power calculation unit 9.
  • the second inverse Fourier transform unit 10b generates an SP-based delay profile (second delay profile) using the result of performing the inverse Fourier transform on the transmission path characteristic signal obtained by the time direction interpolation unit 6. It is a component.
  • the delay profile synthesizing unit 11 is a component that inputs a power base delay profile from the first inverse Fourier transform unit 10a and inputs an SP base delay profile from the second inverse Fourier transform unit 10b.
  • the SP base delay profile value corresponding to the arrival time having a value equal to or greater than the threshold value is left, and other SP base delay profile values are replaced with the minimum value to generate a new delay profile.
  • reflection or attenuation is performed from the time a signal is transmitted from a transmitting station until it is received by a receiving device, and a plurality of arriving waves reach the receiving device by being simultaneously transmitted from a plurality of transmitting sites. It becomes the signal of the path.
  • Data indicating the arrival time and intensity (D / U ratio) of each incoming wave included in the multipath signal is called a delay profile.
  • the strongest incoming wave is called the main wave
  • the incoming wave that arrives later than the main wave is called the delayed wave
  • the incoming wave that arrives earlier than the main wave is called the preceding wave.
  • the subcarrier power calculation unit 9 squares the I axis (real axis) and Q axis (imaginary axis) of the frequency axis signal (complex signal) for each subcarrier obtained by the Fourier transform unit 2. Addition is performed, and the addition result is input to the I axis of the inverse Fourier transform by the first inverse Fourier transform unit 10a, and zero is input to the Q axis.
  • the first inverse Fourier transform unit 10a performs the inverse Fourier transform, squares the I-axis and the Q-axis after the inverse Fourier transform, and adds the result as a power-based delay profile (first delay profile). Output to the profile composition unit 11.
  • the power-based delay profile is characterized in that the main wave is the center, the time range in which the incoming wave can be detected is from 0 to Ts / 2, and both the delayed wave and the preceding wave appear symmetrically around the main wave. Note that the power-based delay profile obtained here may be used after being smoothed.
  • the second inverse Fourier transform unit 10b performs inverse Fourier transform on the output (complex signal) of the time direction interpolation unit 6, squares the I axis and Q axis of the output of the inverse Fourier transform, and adds the result.
  • the SP base delay profile (second delay profile) is output to the delay profile synthesis unit 11.
  • the center position of the time range in which the incoming wave can be detected in the SP-based delay profile is called a demodulation reference point. That is, in the SP base delay profile, it is possible to detect an incoming wave in a range up to ⁇ Ts / 6 with the demodulation reference point as the center.
  • the SP-based delay profile obtained here may be used after being smoothed.
  • the order of each data in the delay profiles of both the power-based delay profile and the SP-based delay profile is called an index, and each index corresponds to the arrival time.
  • FIG. 10 is a flowchart showing an operation flow by the delay profile synthesis unit of the first embodiment
  • FIG. 11 is an explanatory diagram for explaining delay profile synthesis processing.
  • a new delay profile generation process will be described with reference to FIG.
  • the delay profile synthesis unit 11 detects the index of the main wave of the SP base delay profile (step ST1). Since the main wave has the largest value in the delay profile, the index corresponding to the largest value is detected as the main wave index among the data of the SP-based delay profile.
  • the delay profile synthesis unit 11 calculates a main wave offset value corresponding to the difference between the main wave index of the SP base delay profile and the index of the center (demodulation reference point) of the SP base delay profile (step ST2). ).
  • ⁇ which is an index difference between the center (demodulation reference point) of the SP base delay profile indicated by a broken line and the main wave, is the main wave offset value. Therefore, the delay profile synthesizing unit 11 obtains a value obtained by subtracting the index of the center (demodulation reference point) of the SP base delay profile from the main wave index of the SP base delay profile as the main wave offset value ⁇ .
  • FIG. 11B in the power-based delay profile, the main wave is always the center of the delay profile.
  • the delay profile synthesis unit 11 offsets the index of the power-based delay profile (step ST3).
  • the index of the power-based delay profile is offset by the amount corresponding to the main wave offset value ⁇ to replace each data.
  • the main wave index of the SP-based delay profile is matched with the main wave index of the power-based delay profile.
  • the delay profile synthesizing unit 11 reads the power-based delay profile value obtained by offsetting the index in step ST3 one by one (step ST4), compares the value with a predetermined threshold (threshold), and determines whether or not the read value is smaller than the threshold. Is determined (step ST5). If the read value is equal to or greater than the threshold value (step ST5; NO), no processing is performed on the SP-based delay profile data corresponding to the arrival time (index) of the read value, and the process of step ST7 is performed.
  • a predetermined threshold threshold
  • step ST6 the delay profile synthesis unit 11 replaces the data of the SP base delay profile corresponding to the arrival time (index) of this read value with 0 (or incoming wave data). (Replaced with the smallest value that is not treated as) (step ST6).
  • the delay time between the SP-based delay profile and the power-based delay profile may not uniquely correspond depending on the number of inverse Fourier transform points. In this case, the closest delay time (index) value is selected and replaced with 0 or the minimum value. Also, if there is no SP-based delay profile value for the corresponding delay time, no processing is performed. This is because the power-based delay profile has a delay time range (detection time range) up to Ts / 2, while the SP-based delay profile is ⁇ Ts / 6.
  • step ST7 the delay profile synthesis unit 11 determines whether or not the processing has been completed for all indexes of the power-based delay profile.
  • step ST7 the process returns to step ST4, the value corresponding to the next index of the power-based delay profile is read, and step ST4.
  • the delay profile combining unit 11 sets the value corresponding to the value that does not satisfy the threshold in the power-based delay profile to 0 or the minimum value.
  • the permuted SP-based delay profile is output as a so-called combined composite delay profile, where the advantages of both delay profiles are. That is, even if the original SP base delay profile includes a pseudo incoming wave, the advantage of the power base delay profile in which the pseudo incoming wave does not appear is used to eliminate the SP incoming delay pseudo incoming wave. Thus, the delay profile shown in FIG. 11D can be obtained as the combined delay profile, and the pseudo arrival wave does not appear.
  • the power-based delay profile cannot distinguish between the preceding wave and the delayed wave, but by using the SP-based delay profile that can distinguish these, the combined delay profile has a preceding wave and a delayed wave as shown in FIG. Can distinguish waves. Furthermore, when there are a plurality of incoming waves, the power-based delay profile becomes intermodulation, and there is a drawback that an originally existing incoming wave appears on the delay profile, but it does not appear in the combined delay profile. Thus, in the first embodiment, the delay profile can be obtained more accurately than in the conventional technique.
  • the Fourier transform unit 2 that performs Fourier transform on the received OFDM signal for each transmission unit, and subcarrier power data is calculated from the data that is Fourier transformed by the Fourier transform unit 2.
  • a subcarrier power calculation unit 9 that performs inverse Fourier transform on the subcarrier power data to generate a power-based delay profile, and a pilot signal from data Fourier-transformed by the Fourier transform unit 2.
  • a pilot signal extracting unit 3 for extracting, a dividing unit 5 for dividing the pilot signal by a known value to calculate transmission line characteristic data for the pilot signal of each transmission unit, and transmission line characteristic data for the pilot signal of each transmission unit
  • the time direction interpolation unit 6 for interpolating in the time direction and the transmission path characteristic data interpolated in the time direction
  • the second inverse Fourier transform unit 10b that generates an SP-based delay profile by Fourier transform, and the arrival wave of the power-based delay profile so that the arrival times of the main wave of the power-based delay profile and the SP-based delay profile match.
  • a delay profile synthesis unit 11 that outputs a delay profile of the received OFDM signal by replacing the value corresponding to 1 with a value not treated as an incoming wave (0 or a minimum value not treated as an incoming wave).
  • Embodiment 2 The basic structure of the digital broadcast receiving apparatus according to the second embodiment is the same as that of the first embodiment, but the method for creating a composite delay profile is different. Therefore, the configuration of the digital broadcast receiving apparatus according to the second embodiment will be described in detail below with reference to FIG. 9 shown in the first embodiment and the details of the composite delay profile creation process according to the second embodiment. .
  • FIG. 12 is a flowchart showing a flow of operations performed by the delay profile synthesis unit according to the second embodiment of the present invention, and a new delay profile generation process will be described with reference to FIG.
  • the delay profile synthesis unit 11 detects the index of the main wave of the SP base delay profile (step ST1a). Since the main wave has the largest value in the delay profile, the index corresponding to the largest value is detected as the main wave index among the data of the SP-based delay profile.
  • the delay profile synthesis unit 11 calculates a main wave offset value corresponding to the difference between the main wave index of the SP base delay profile and the index of the center (demodulation reference point) of the SP base delay profile (step ST2a).
  • a value obtained by subtracting the index of the center (demodulation reference point) of the SP base delay profile from the index of the main wave of the SP base delay profile is obtained as the main wave offset value ⁇ .
  • the delay profile synthesis unit 11 offsets the index of the power-based delay profile (step ST3a).
  • the index of the power base delay profile is offset by the amount of the main wave offset value ⁇ to replace each data, and the main wave indexes of the SP base delay profile and the power base delay profile are matched.
  • the delay profile synthesizing unit 11 reads the power-based delay profile value obtained by offsetting the index in step ST3a one index at a time (step ST4a), and the SP base corresponding to the read value and the arrival time (index) of the read value.
  • the delay profile value is multiplied (step ST5a).
  • the delay time between the SP base delay profile and the power base delay profile may not uniquely correspond.
  • the closest delay time (index) value is selected and multiplied.
  • no processing is performed. This is because in the power-based delay profile, the delay time range (detection time range) is up to Ts / 2, while the SP-based delay profile is ⁇ Ts / 6.
  • step ST6a the delay profile synthesis unit 11 determines whether or not the processing has been completed for all indexes of the power-based delay profile.
  • step ST6a the process returns to step ST4a, and a value corresponding to the next index of the power-based delay profile is read, and step ST4a To step ST6a are repeated.
  • step ST6a When the above processing is completed for all indexes of the power base delay profile (step ST6a; YES), the delay profile synthesis unit 11 multiplies the values of the corresponding indexes between the power base delay profile and the SP base delay profile. The result is output as a delay profile of the received OFDM signal.
  • the delay profile By generating the delay profile in this way, even if the SP-based delay profile includes a pseudo incoming wave, the pseudo-incoming wave does not appear in the power-based delay profile. The level can be reduced. In addition, the power-based delay profile cannot distinguish between the preceding wave and the delayed wave, but it is also possible to distinguish these by combining with the SP-based delay profile. Further, when there are a plurality of incoming waves, the power-based delay profile has cross-modulation, and there is a disadvantage that an incoming wave that does not exist originally appears on the delay profile, but an incoming wave that does not exist in the SP-based delay profile. Therefore, the level of the incoming wave can be reduced by combining by multiplication.
  • the delay profile can be obtained more accurately than in the conventional technique.
  • the apparatus configuration can be simplified as compared with the first embodiment.
  • the Fourier transform unit 2 that performs Fourier transform on the received OFDM signal for each transmission unit, and subcarrier power data is calculated from the data that is Fourier transformed by the Fourier transform unit 2.
  • a subcarrier power calculating unit 9 a first inverse Fourier transform unit 10 a that generates a power-based delay profile by performing inverse Fourier transform on the subcarrier power data, and a pilot signal from data Fourier transformed by the Fourier transform unit 2.
  • Time direction interpolation unit 6 for interpolating characteristic data in the time direction and transmission interpolated in the time direction
  • the second inverse Fourier transform unit 10b that generates an SP base delay profile by performing inverse Fourier transform on the characteristic data, and the power base delay profile so that the arrival times of the main waves of the power base delay profile and the SP base delay profile match.
  • the detection time of the incoming wave is offset, and the power-based delay profile offset from the detection time of the incoming wave is multiplied by the corresponding arrival time value of the SP-based delay profile, and output as the delay profile of the received OFDM signal A delay profile synthesizing unit 11.
  • the power base delay profile value and the SP base delay profile the error signal included in the power base delay profile and the error signal included in the SP base delay profile cancel each other, and a high-speed moving environment is obtained. Even so, it is possible to detect an accurate arrival time delay profile.
  • the apparatus configuration is simplified as compared with the first embodiment.
  • Embodiment 3 The basic structure of the digital broadcast receiving apparatus according to the third embodiment is the same as that of the first embodiment, but the method for creating a composite delay profile is different. Therefore, the configuration of the digital broadcast receiving apparatus according to the third embodiment will be described in detail below with reference to FIG. 9 shown in the first embodiment and the details of the composite delay profile creation process according to the third embodiment. .
  • FIG. 13 is an explanatory diagram for explaining delay profile synthesis processing according to Embodiment 3 of the present invention.
  • the SP-based delay profile turns back as a delayed wave
  • the delayed wave turns back as a preceding wave and appears on the delay profile.
  • FIG. 13A shows a case where a preceding wave earlier than the time range of ⁇ Ts / 6 from the demodulation reference point is turned back and appears on the delay profile like a delayed wave.
  • FIG. 13A shows a case where a preceding wave earlier than the time range of ⁇ Ts / 6 from the demodulation reference point is turned back and appears on the delay profile like a delayed wave.
  • the power-based delay profile has a time range in which an incoming wave can be detected up to Ts / 2, but the relative time difference between the delayed wave and the preceding wave with respect to the main wave is obtained. I can't. For this reason, in the incoming wave detected in the time range of ⁇ Ts / 2 from the center (main wave) of the power-based delay profile, the preceding wave and the delayed wave cannot be distinguished.
  • the delay profile synthesis unit 11 sets the delay profile contents in the detection time range of ⁇ Ts / 6 with the demodulation reference point in the SP base delay profile as the center.
  • a delay profile (third delay profile) copied before and after the detection time range of the initial SP base delay profile is created. Since this delay profile coincides with the time range of ⁇ Ts / 2 from the center of the power-based delay profile, the delay profile of the received OFDM signal is determined in the same manner as in the first embodiment or the second embodiment. Can be created.
  • the power-based delay profile in the time range of ⁇ Ts / 2 from the center is offset (the SP-based delay profile and the main wave index are matched), and the offset-based power-based delay profile is processed. Is read one index at a time, compared with a predetermined threshold (threshold), and the value of the SP base delay profile corresponding to the read value index smaller than the threshold is replaced with 0 or the minimum value.
  • the delay profile of the OFDM signal is offset (the SP-based delay profile and the main wave index are matched), and the offset-based power-based delay profile is processed. Is read one index at a time, compared with a predetermined threshold (threshold), and the value of the SP base delay profile corresponding to the read value index smaller than the threshold is replaced with 0 or the minimum value.
  • the power base delay profile value in the time range of ⁇ Ts / 2 from the center is offset processed (the SP base delay profile and the main wave index are matched), and the offset processed power base A delay profile of the received OFDM signal is obtained by reading the value of the delay profile one index at a time and multiplying the read value by the SP base delay profile value corresponding to the arrival time (index) of the read value.
  • the delay profile synthesis unit 11 determines the delay profile contents in the detection time range of the incoming wave in the SP-based delay profile output from the second inverse Fourier transform unit 10b.
  • a delay profile of the received OFDM signal is generated using a delay profile copied before and after the detection time range and a power-based delay profile in a time range of ⁇ Ts / 2 from the center.
  • FIG. 14 is a block diagram showing a configuration of a digital broadcast receiving apparatus according to Embodiment 4 of the present invention.
  • the digital broadcast receiving apparatus 1B according to the fourth embodiment includes only one inverse Fourier transform unit 10. That is, when the signal selection unit 12 switches between the output of the subcarrier power calculation unit 9 and the output of the time direction interpolation unit 6 and inputs the output to the inverse Fourier transform unit 10, one inverse Fourier transform unit 10 has the power.
  • a base delay profile is generated and an SP base delay profile is generated.
  • the memory unit 13 is a storage unit that stores the delay profile generated by the inverse Fourier transform unit 10, and the stored delay profile is appropriately read by the delay profile synthesis unit 11.
  • FIG. 14 the same components as those in FIG.
  • the signal selection unit 12 selects the output of the subcarrier power calculation unit 9 and the output of the time direction interpolation unit 6 for the same received signal, and inputs them to the inverse Fourier transform unit 10.
  • the inverse Fourier transform unit 10 performs an inverse Fourier transform on the output signal of the subcarrier power calculation unit 9 and the output signal of the time direction interpolation unit 6 input via the signal selection unit 12, respectively,
  • Each of the Q axes is squared and added to be stored in the memory unit 13 as a power base delay profile and an SP base delay profile.
  • the inverse Fourier transform unit 10 obtains a profile obtained by copying the content of the detection time range of the SP base delay profile before and after the time series with respect to the SP base delay profile. It may be created and stored in the memory unit 13.
  • the delay profile synthesizing unit 11 uses the power-based delay profile and the SP-based delay profile stored in the memory unit 13 in the same manner as in any one of the first to third embodiments to receive the received OFDM signal. Create a delay profile.
  • the Fourier transform unit 2 that performs Fourier transform on the received OFDM signal for each transmission unit, and subcarrier power data is calculated from the data that is Fourier transformed by the Fourier transform unit 2.
  • the subcarrier power calculating unit 9 for outputting, the pilot signal extracting unit 3 for extracting the pilot signal from the data Fourier-transformed by the Fourier transform unit 2, and dividing the extracted pilot signal by a known value to each transmission unit
  • a division unit 5 that calculates transmission line characteristic data for each pilot signal, a time direction interpolation unit 6 that outputs the transmission line characteristic data for pilot signals of each transmission unit in the time direction, and a subcarrier power calculation unit 9
  • the signal selection unit 12 for switching and selecting the output data of the time direction interpolation unit 6 and the signal selection unit 12
  • An inverse Fourier transform unit 10 that performs inverse Fourier transform on the output data, a power-based delay profile obtained by performing inverse Fourier transform on the output data of the subcarrier power calculation unit 9 by the inverse Fourier transform unit 10, and
  • FIG. FIG. 15 is a block diagram showing a configuration of a digital broadcast receiving apparatus according to Embodiment 5 of the present invention.
  • the digital broadcast receiving apparatus 1C according to the fifth embodiment has a Fourier transform timing generation unit 14 added to the configuration of the fourth embodiment.
  • the Fourier transform timing generation unit 14 is a component that generates an optimal Fourier transform timing (start time position of Fourier transform) based on the output (synthesis delay profile) of the delay profile synthesis unit 11.
  • the generated Fourier transform timing is notified from the Fourier transform timing generation unit 14 to the Fourier transform unit 2. For example, when an arrival wave having an arrival time exceeding the guard interval appears on the delay profile, the Fourier transform timing generation unit 14 changes the Fourier transform timing so as to be within the guard interval. Thereby, reception performance can be improved.
  • the delay profile synthesis unit 11 creates a synthesis delay profile by a method similar to any one of the first to third embodiments.
  • the time direction interpolation unit 6 and the frequency direction interpolation unit 7 each determine an optimum interpolation coefficient based on the output (synthesis delay profile) of the delay profile synthesis unit 11. For example, when an incoming wave that exceeds the band of the interpolation coefficient appears on the delay profile, the coefficient is changed to the interpolation coefficient so as to be within the band.
  • the digital broadcast receiving apparatus includes the above-described Fourier transform timing control by the Fourier transform timing generation unit 14, control of the interpolation coefficient by the time direction interpolation unit 6, and interpolation by the frequency direction interpolation unit 7.
  • control of the insertion coefficient at least one control is executed, and all the controls may be combined and executed.
  • the Fourier transform timing generation unit 14 that determines the start timing (start time position) of the Fourier transform from the combined delay profile generated by the delay profile combining unit 11 is provided.
  • the accurate start timing of the Fourier transform can be determined using the accurate delay profile that does not include the error signal generated by the delay profile synthesis unit 11.
  • the delay profile combining unit 11 since at least one of the time direction interpolation unit 6 and the frequency direction interpolation unit 7 determines an interpolation coefficient from the combined delay profile generated by the delay profile combining unit 11, the delay profile combining unit 11 generates the interpolation coefficient.
  • An accurate delay profile that does not include the generated error signal can be used to determine the optimal interpolation factor.
  • the concept of the fifth embodiment can be applied to any one of the first to third embodiments. Is applied, and at least one of the control of the Fourier transform timing by the Fourier transform timing generation unit 14, the control of the interpolation coefficient by the time direction interpolation unit 6, and the control of the interpolation coefficient by the frequency direction interpolation unit 7 is applied. May be configured to execute, or may be configured to execute all controls in combination.
  • the digital broadcast receiving apparatus is an environment in which a mobile body on which the digital broadcast receiver is mounted moves at high speed or there is an incoming wave that exceeds the time range in which the incoming wave can be detected with the SP-based delay profile. Since a delay profile that does not include an error can be provided and accurate reception is possible without erroneous control, it is suitable for an on-vehicle digital broadcast receiving apparatus.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Circuits Of Receivers In General (AREA)
  • Noise Elimination (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention porte sur un appareil de réception de diffusion numérique qui décale l'instant de détection d'ondes entrantes dans un profil de retard à base de puissance de telle manière que les instants d'arrivée des ondes primaires du profil de retard à base de puissance et du profil de retard à base de SP concordent. Dans le profil de retard à base de SP, les valeurs correspondant aux instants d'arrivée ayant des valeurs supérieures ou égales à un seuil prédéterminé, dans le profil de retard à base de puissance dont les instants de détection des ondes entrantes sont décalés, sont conservées intactes, tandis que des valeurs correspondant aux instants d'arrivée ayant des valeurs inférieures au seuil sont remplacées par des valeurs non traitées à titre d'ondes entrantes. Le résultat est délivré à titre de profil de retard du signal OFDM reçu.
PCT/JP2010/000235 2010-01-18 2010-01-18 Appareil de réception de diffusion numérique et procédé de génération de profil de retard WO2011086609A1 (fr)

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JP2011549751A JP4926307B2 (ja) 2010-01-18 2010-01-18 デジタル放送受信装置及び遅延プロファイル作成方法
CN201080053009.9A CN102668426B (zh) 2010-01-18 2010-01-18 数字广播接收装置及延迟分布生成方法
PCT/JP2010/000235 WO2011086609A1 (fr) 2010-01-18 2010-01-18 Appareil de réception de diffusion numérique et procédé de génération de profil de retard
DE112010005148.8T DE112010005148B4 (de) 2010-01-18 2010-01-18 Digitalrundfunkempfänger und Verzögerungsprofil-Erzeugungsverfahren

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JP2014200030A (ja) * 2013-03-29 2014-10-23 富士通株式会社 受信機および同期補正方法
JP2017005680A (ja) * 2015-06-11 2017-01-05 日本放送協会 測定器、チップ及びプログラム
JP2017005681A (ja) * 2015-06-11 2017-01-05 日本放送協会 測定器、チップ及びプログラム
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JP2014200030A (ja) * 2013-03-29 2014-10-23 富士通株式会社 受信機および同期補正方法
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DE112010005148T5 (de) 2012-10-25
DE112010005148B4 (de) 2014-07-17

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