WO2005006750A1 - Emission/reception de radiodiffusion numerique ameliorant les performances de reception, et procede de traitement de signaux associe - Google Patents

Emission/reception de radiodiffusion numerique ameliorant les performances de reception, et procede de traitement de signaux associe Download PDF

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Publication number
WO2005006750A1
WO2005006750A1 PCT/KR2004/001383 KR2004001383W WO2005006750A1 WO 2005006750 A1 WO2005006750 A1 WO 2005006750A1 KR 2004001383 W KR2004001383 W KR 2004001383W WO 2005006750 A1 WO2005006750 A1 WO 2005006750A1
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WO
WIPO (PCT)
Prior art keywords
signal
pilot
sync
hidden
pulse
Prior art date
Application number
PCT/KR2004/001383
Other languages
English (en)
Inventor
Joon-Soo Kim
Dong-Hoon Lee
Jung-Won Kwak
Chan-Sub Park
Original Assignee
Samsung Electronics Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020030064001A external-priority patent/KR101018381B1/ko
Application filed by Samsung Electronics Co., Ltd. filed Critical Samsung Electronics Co., Ltd.
Priority to EP04773906A priority Critical patent/EP1645126A4/fr
Priority to CN2004800199382A priority patent/CN1823526B/zh
Publication of WO2005006750A1 publication Critical patent/WO2005006750A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving encoded video stream packets from an IP network
    • H04N21/4382—Demodulation or channel decoding, e.g. QPSK demodulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H04N21/2383—Channel coding or modulation of digital bit-stream, e.g. QPSK modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/242—Synchronization processes, e.g. processing of PCR [Program Clock References]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/21—Circuitry for suppressing or minimising disturbance, e.g. moiré or halo
    • H04N5/211—Ghost signal cancellation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/426—Internal components of the client ; Characteristics thereof

Definitions

  • the present invention relates generally to digital broadcasting transmission and reception systems. More particularly, the present invention pertains to a digital broadcasting transmission system capable of improving performance of a reception system by inserting a hidden pilot signal and a signal processing method thereof, and also a corresponding digital broadcasting reception system and a signal processing method thereof.
  • Background Art
  • FIG. 1 is a schematic block diagram of the United States 8-VSB DTV transmission system.
  • the transmission system includes a forward error correction (FEC) encoder 110, a sync insertion unit 120, a pilot insertion unit 130, a pulse shaping filter 140, and a radio frequency (RF) unit 150.
  • FEC forward error correction
  • RF radio frequency
  • the FEC encoder 110 includes a randomizer 111, a Reed-Solomon (RS) encoder 113, an interleaver 115, and a trellis encoder 117.
  • RS Reed-Solomon
  • the randomizer 111 randomizes an incoming MPEG2-TS data packet.
  • the RS encoder 113 assigns a RS parity of certain bytes for the error correction of data.
  • the interleaver 115 interleaves the RS-encoded data according to a certain pattern.
  • the trellis encoder 117 trellis-encodes the interleaved data at a 2/3 rate.
  • the sync insertion unit 120 inserts a segment sync and a field sync into the FEC- encoded signal.
  • the pilot insertion unit 130 inserts a pilot tone by applying a certain DC component to data symbol of 8 levels.
  • the pulse shaping filter 140 pulse-shapes the pilot-tone-inserted signal by use of a filter having a certain rollOff factor.
  • the RF unit 150 up-con verts the pulse-shaped signal into a signal of a RF channel band to be transmitted, and transmits the converted signal via an antenna.
  • FIG. 2 is a structure of a transmission frame containing the segment sync and the field sync which are inserted in the sync insertion unit 120 of FIG. 1.
  • the final data frame is created in a manner that an output signal from the FEC encoder 110 is mapped into a signal of 8 levels, that is, -7, -5, -3, -1, 1, 3, 5, 7, and the segnent sync and field sync having a binary PN sequence of -5 and 5 levels are added to the 8-level signal.
  • each segment sync consists of four symbols and a whole segment including the segment sync signal consists of 832 symbols. 313 segments make up a frame, and a first segment of each frame consists of a series of a PN sequence which is the field sync.
  • the PN sequence is a sync known to a reception side, and is used as a reference signal for equalization.
  • the conventional digital broadcasting transmission system is vulnerable to the multipath environment. Accordingly, performance of a reception system depends on that of an equalizer which removes ghost components occurring in the multipath.
  • an aspect of the present invention is to provide a digital broadcasting transmission system capable of maintaining a data rate of the conventional system and enhancing a receiving performance of a reception system and a signal processing method, and a corresponding digital broadcasting reception system and a signal processing method thereof.
  • the digital broadcasting transmission system includes a FEC encoder encoding an incoming signal according to a certain FEC scheme, a sync insertion unit inserting a sync into the encoded signal, a hidden pilot insertion unit inserting a hidden pilot into the sync-inserted signal, a pilot insertion unit inserting a pilot tone into the hidden-pilot-inserted signal, a pulse shaping filter pulse-shaping the pilot-tone-inserted signal with a certain roll-off factor, and a RF unit transmitting the pulse-shaped signal through a transmission channel band.
  • the sync includes a segnent sync inserted once per segnent and a field sync inserted once per field.
  • the hidden pilot is a PN sequence of a predetermined length and having a cyclic property, and an average power of the PN sequence having the predetermined length is lower than that of the input signal.
  • the signal processing method of the transmission system includes encoding an incoming signal according to a FEC scheme, inserting a sync into the encoded signal, inserting a hidden pilot into the sync-inserted signal, inserting a pilot tone into the hidden-pilotinserted signal, pulse-shaping the pilot-tone-inserted signal with a certain rollOff factor, and transmitting the pulse-shaped signal through a transmission channel band.
  • the reception system corresponding to the transmission system includes a tuner receiving and converting a signal of a tuned band into a signal of a baseband, a frequency recoverer compensating a frequency offset of a received signal, a timing recoverer compensating a timing offset of the received signal, a channel estimator estimating multipath by use of a hidden pilot contained in the received signal, an equalizer equalizing the received signal based on the estimated multipath, and a FEC decoder correcting errors of the received signal according to a certain FEC scheme.
  • the channel estimator includes a correlator acquiring a correlation value between the hidden pilot and a reference signal, and an accumulator estimating the multipath by repeatedly accumulating the correlation value a predetermined number of times so that the correlation value has a certain magnitude.
  • the reception system further includes a frequency offset estimator estimating the frequency offset based on the correlation value of the hidden pilot, and a timing offset estimator estimating the timing offset based on the correlation value of the hidden pilot.
  • the signal processing method of the reception system includes receiving a signal of a tuned band, compensating a frequency offset of a received signal, compensating a timing offset of the received signal, channel estimating multipath by use of a hidden pilot contained in the received signal, equalizing the received signal based on the estimated multipath, and correcting errors in the received signal according to a certain FEC scheme.
  • the channel estimation includes acquiring a correlation value between the hidden pilot and a reference signal, and estimating the multipath by repeatedly accumulating the correlation value a predetermined number of times so that the correlation value has a certain magnitude.
  • the method further includes estimating the frequency offset based on the correlation value of the hidden pilot, and estimating the timing offset based on the correlation value of the hidden pilot.
  • the transmission system containing the hidden pilot enhances equalization and synchronization performances even in the multipath conditions.
  • the reception system can minimize performance degrade resulting from noise.
  • the transmission system including the hidden pilot results in enhancement of the equalization and synchronization acquirement performances in the multipath environment.
  • the reception system can minimize the performance degrade resulting from the noise by transmitting the low-power hidden pilot.
  • FIG. 1 is a schematic block diagram illustrating a conventional US 8-VSB transmission system
  • FIG. 2 is a frame structure according to the transmission system of FIG. 1;
  • FIG. 3 is a schematic diagram illustrating a digital broadcasting transmission system according to an embodiment of the present invention.
  • FIG. 4 is a diagram illustrating a normalized periodic correlation property of a PN sequence
  • FIG. 5 is a diagram illustrating a hidden pilot being inserted into a certain signal according to an embodiment of the present invention
  • FIG. 6 is a schematic block diagram partially illustrating the transmission system according to another embodiment of the present invention.
  • FIG. 7 a schematic block diagram partially illustrating the transmission system according to still another embodiment of the present invention.
  • FIG. 8 is a flowchart illustrating exemplary steps of a signal processing method of the transmission system according to an embodiment of the present invention.
  • FIGS. 9 and 10 are partial flowcharts illustrating exemplary hidden pilot processing steps corresponding to the transmission systems of FIGS. 6 and 7;
  • FIG. 11 is a schematic block diagram illustrating a digital reception system according to an embodiment of the present invention.
  • FIG. 12 is a detailed block diagram illustrating the channel estimator of FIG. 11.
  • FIG. 13 is a flowchart illustrating exemplary steps of a signal processing method of the reception system according to an embodiment of the present invention. Best Mode
  • FIG. 3 is a schematic diagram illustrating a digital broadcasting transmission system according to an embodiment of the present invention.
  • the transmission system includes a forward error correction (FEC) encoder 310, a sync insertion unit 320, a hidden pilot insertion unit 330, a pilot insertion unit 340, a pulse shaping filter 350, and a radio frequency (RF) unit 360.
  • FEC forward error correction
  • RF radio frequency
  • the FEC encoder 310 includes a randomizer 311, a Reed-Solomon (RS) encoder 313, an interleaver 315, and a trellis encoder 317.
  • the randomizer 311 randomizes incoming MPEG2-TS data.
  • the RS encoder 313 assigns a RS parity of certain bytes for the error correction of data.
  • the interleaver 315 interleaves the RS parity- assigned data according to a certain pattern.
  • the trellis encoder 317 trellis-encodes the interleaved data at a 2/3 rate.
  • the sync insertion unit 320 maps the FEC-encoded signal into a signal of a certain level, and inserts into the mapped signal a segment sync once per segnent and a field sync once per field, to thus create the frame of FIG. 2.
  • the certain level of the signal is eight levels and the sync is a 2-level binary signal.
  • the hidden pilot insertion unit 330 inserts a hidden pilot signal into the mapped signal and the sync.
  • the hidden pilot uses a certain PN sequence which is a binary signal having a cyclic property.
  • the PN sequence that is, the hidden pilot of FIG. 4 has a normalized auto-correlation property and a power lower than an average power of the data signal.
  • a processing gain of the reception side is about 30 dB to process the PN sequence.
  • the power of the 1023-symbol PN sequence is about 30 dB, power ratio of the reception side becomes 0 dB after the correlation. Consequently, it is advantageous to determine the power of the hidden pilot based on the processing gain of the reception side which corresponds to the length of the PN sequence. Influence to noise threshold of visibility (TOV) is hardly experienced in using the low-power PN sequence.
  • TOV noise threshold of visibility
  • FIG. 5 is a diagram illustrating the hidden pilot being inserted into the 8-level signal.
  • the 8-level signal is randomly distributed as shown in (a), and the 2-level PN sequence of low power as shown in (b) is added to the 8-level signal.
  • a signal is output which seems to include a noise component of low power in the 8-level signal.
  • the hidden pilot becomes an insignificant noise component which substantially does not degrade the performance of a reception system.
  • the pilot insertion unit 340 inserts one pilot tone into an edge of low frequency band in a frequency spectrum by applying a certain DC component to the hidden- pilotinserted symbols.
  • the pulse shaping filter 350 pulse-shapes the signal with the pilot and pilot tone by use of a filter having a certain roll-off factor.
  • the RF unit 360 up-converts the pulse-shaped signal into a signal of a RF channel band to be transmitted, and transmits the converted signal via an antenna.
  • FIG. 6 is a schematic block diagram partially illustrating the transmission system according to another embodiment of the present invention
  • FIG. 7 a schematic block diagram partially illustrating the transmission system according to still another embodiment of the present invention. It will be appreciated that various embodiments can be adopted based on positions containing the sync and the hidden pilot.
  • the hidden pilot is inserted into other symbols excluding the segment sync within the segnent symbols.
  • the hidden pilot insertion unit 520 inserts the hidden pilot by applying a certain PN sequence to the signal which is encoded through randomizing, RS encoding, interleaving, and trellis encoding in the FEC encoder 510.
  • the length of the PN sequence which is the hidden pilot can vary. For example, if applying the 8-VSB transmission scheme, the length of the PN sequence corresponds to 828 symbols excluding the 4-symbol segnent sync within a 832-symbol segnent.
  • the sync insertion unit 530 inserts the segnent sync and the field sync, respectively, into the hidden-pilot-inserted signal. Next, the pilot tone is inserted.
  • the processed signal is pulse-shaping- filtered and transmitted through a RF channel.
  • the hidden pilot is inserted into entire symbols of a segment.
  • the first sync insertion unit 620 inserts the segnent sync once per segnent into a signal which is encoded in the FEC encoder 610.
  • the hidden pilot insertion unit 630 inserts the hidden pilot by applying a certain PN sequence to the segment- sync-inserted signal, that is, entire symbols of the segnent.
  • the length of the PN sequence which is the hidden pilot can vary. For example, if applying the 8-VSB transmission scheme, the length of the PN sequence may correspond to entire 832 symbols of the segnent.
  • the second sync insertion unit 64-0 inserts the field sync once per field into the hidden-pilotinserted signal. Next, the pilot tone is inserted. The processed signal is pulse-shaping-filtered and transmitted through a transmission channel.
  • FIG. 8 is a flowchart illustrating exemplary steps of a signal processing method of the transmission system according to an embodiment of the present invention, which is described below.
  • the FEC encoder 310 encodes the MPEG2-TS data signal through randomizing, RS encoding, interleaving, and trellis encoding at step S311.
  • the sync insertion unit 320 inserts the segment sync once per segnent and the field sync once per field with respect to the encoded signal at step S313.
  • the hidden pilot insertion unit 330 inserts the hidden pilot with respect to the encoded signal and the syncs at step S315.
  • the pilot insertion unit 340 inserts one pilot tone into the hidden-pilotinserted signal which is the PN sequence of low power at step S317.
  • the pilot-toneinserted signal is pulse-shaping-filtered by the pulse shaping filter 350 having a certain roll-off factor and transmitted by the RF unit 360 through the transmission channel at step S319.
  • FIGS. 9 and 10 are flowcharts illustrating exemplary hidden pilot processing steps of the transmission systems of FIGS. 6 and 7.
  • FIG. 9 corresponds to the transmission system of FIG. 6.
  • the hidden pilot insertion unit 520 inserts the hidden pilot into the FEC-encoded signal at step S511.
  • the sync insertion unit 530 inserts the segnent sync and the field sync, respectively, into the hidden-pilotinserted signal.
  • the pilot tone is inserted at step S513.
  • the processed signal is pulse-shaping- filtered and transmitted through the RF channel as mentioned above.
  • FIG. 10 corresponds to the transmission system of FIG. 7.
  • the first sync insertion unit 620 inserts the segment sync once per segnent into the FEC-encoded signal at step S611.
  • the hidden pilot insertion unit 630 inserts the hidden pilot into the segnent- sync-inserted signal, that is, into entire symbols of the segment at step S613.
  • the second sync insertion unit 64-0 inserts the field sync once per field into the hidden-pilotinserted signal at step S615.
  • the pilot tone is inserted.
  • the processed signal is pulse-shaping- filtered and transmitted through the transmission channel as mentioned above.
  • FIG. 11 is a schematic block diagram illustrating the reception system, which is superior in equalization and synchronization by utilizing the hidden pilot according to an embodiment of the present invention.
  • the reception system includes a tuner 710, a frequency recoverer 720, a timing recoverer 730, an analog signal remover 740, a frequency offset estimator 750, a timing offset estimator 760, a channel estimator 770, an equalizer 780, and a FEC encoder 790.
  • the tuner 710 converts a received signal of a tuned band into a signal of a baseband.
  • the frequency recoverer 720 compensates a frequency offset estimated in the frequency offset estimator 750.
  • the timing recoverer 720 compensates a timing offset estimated in the timing offset estimator 760.
  • the analog signal remover 740 discards an analog signal contained in the received signal of the tuned band.
  • the frequency offset estimator 750 estimates a frequency offset initially using the pilot-tone of the received signal. Next, the frequency offset estimator 750 estimates the frequency offset based on correlation values of the hidden pilot provided from the channel estimator 770. [79] The timing offset estimator 760 estimates a timing offset initially using the sync and data signals. Next, the timing offset estimator 760 estimates the timing offset based on the correlation values of the hidden pilot provided from the channel estimator 770.
  • the channel estimator 770 estimates multipath using the hidden pilot in the received signal, which will be described below in greater detail with reference to FIG. 12.
  • the equalizer 780 removes the multipath which is estimated in the channel estimator 770 using the hidden pilot.
  • the FEC decoder 790 detects and corrects errors in correspondence to the FEC encoding scheme of the transmission system of FIG. 3.
  • FIG. 12 is a detailed block diagram of the channel estimator 770 of FIG. 11.
  • the channel estimator 770 includes a correlator 771 and an accumulator 773.
  • the correlator 771 acquires a correlation value between the hidden pilot signal of the received signal and a reference signal.
  • the reference signal is the same as the PN sequence which is the hidden pilot inserted at the transmission side. If the hidden pilot of the received signal is identical with the reference signal based on a normalized autocorrelation property of the PN sequence, the correlation value becomes a peak value. If not, the correlation value becomes '0'.
  • a correlation value with respect to a received signal of multipath channel conditions is provided with a channel delay profile corresponding to the multipath.
  • the accumulator 773 repeatedly accumulates the correlation value of the correlator 771 a predetermined number of times.
  • the correlation value which is acquired using the low-power hidden pilot, is low and the low correlation value is accumulated repeatedly a predetermined number of times, to thus output the correlation value of a certain magnitude greater than the data signal.
  • the signal output from the accumulator 773 has the channel delay profile corresponding to the multipath as shown in FIG. 12.
  • the estimated multipath information is furnished to the equalizer 780.
  • the equalizer 780 equalizes based on the estimated multipath information.
  • the frequency offset estimator 750 and the timing offset estimator 760 respectively estimate the frequency offset and the timing offset by use of the correlation property obtained by the correlator 771.
  • the frequency recoverer 720 and the timing recoverer 730 respectively compensate the frequency offset and the timing offset that are estimated based on the correlation value of the hidden pilot.
  • FIG. 13 is a flowchart illustrating exemplary steps of a signal processing method of the reception system according to an embodiment of the present invention, which is described below in greater detail.
  • the tuner 710 receives the signal of the tuned band and converts the signal into the signal of the baseband at step S710.
  • the frequency recoverer 720 and the timing recoverer 730 respectively compensate the frequency offset and the timing offset that are estimated in the frequency offset estimator 750 and the timing offset estimator 760 by use of the pilot tone and the received signal at step S720.
  • the analog signal remover 740 discards an analog signal contained in the received signal by generating a null signal onto the analog signal position at step S730.
  • the channel estimator 770 estimates the channel delay profile by use of the correlation value of the hidden pilot in the received signal at step S740. Specifically, the channel estimator 770 acquires the correlation value between the hidden pilot of the received signal and the reference signal, and repeatedly accumulates the correlation value a predetermined number of times so that the correlation value has a certain magnitude. Hence, the channel delay profile of the received signal is estimated.
  • the equalizer 780 removes the multipath of the received signal based on the channel delay profile estimated in the channel estimator 770 at step S750.
  • the FEC decoder 790 detects and corrects errors with respect to the equalized received signal according to a certain FEC scheme at step S760.
  • the frequency offset estimator 750 and the timing offset estimator 760 respectively, estimate residual fine frequency offset and timing offset based on the correlation value of the hidden pilot provided from the channel estimator 770, and the frequency recoverer 720 and the timing recoverer 730 respectively compensate the estimated fine frequency offset and timing offset at step S770.
  • the receiving performance is enhanced by estimating and compensating the residual frequency of timing offsets, which are not estimated in the related art, based on the correlation value of the hidden pilot.
  • the equalization performance is also enhanced by estimating the channel delay profile by use of the hidden pilot.
  • the present invention relates generally to digital broadcasting transmission and reception systems. More particularly, the present invention pertains to a digital broadcasting transmission system capable of improving performance of a reception system by inserting a hidden pilot signal and a signal processing method thereof, and also a corresponding digital broadcasting reception system and a signal processing method thereof.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

L'invention concerne un système d'émission/réception de radiodiffusion numérique présentant des performances de réception améliorées, ainsi qu'un procédé de traitement de signaux associé. Le système d'émission comprend : un codeur FEC codant un signal entrant, en fonction d'un certain schéma FEC ; une unité d'insertion de synchronisation insérant une synchronisation dans le signal codé ; une unité d'insertion de pilote caché insérant un pilote caché dans le signal à synchronisation insérée ; une unité d'insertion de pilote insérant une tonalité de pilote dans le signal à pilote caché inséré ; un filtre de mise en forme d'impulsions mettant en forme les impulsions du signal à tonalité de pilote insérée, selon un certain facteur de pente de diminution ; et une unité RF émettant le signal à impulsions mises en forme à travers une bande de canaux de transmission. Les performances d'égalisation et d'acquisition de synchronisation peuvent être améliorées dans des conditions de trajets multiples par la mise en oeuvre du système d'émission contenant le pilote caché.
PCT/KR2004/001383 2003-07-15 2004-06-10 Emission/reception de radiodiffusion numerique ameliorant les performances de reception, et procede de traitement de signaux associe WO2005006750A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP04773906A EP1645126A4 (fr) 2003-07-15 2004-06-10 Emission/reception de radiodiffusion numerique ameliorant les performances de reception, et procede de traitement de signaux associe
CN2004800199382A CN1823526B (zh) 2003-07-15 2004-06-10 数字广播发送/接收系统及其信号处理方法

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US48691503P 2003-07-15 2003-07-15
US60/486,915 2003-07-15
KR1020030064001A KR101018381B1 (ko) 2003-07-15 2003-09-16 수신 성능이 향상된 디지털 방송 송/수신 시스템 및 그의신호처리방법
KR10-2003-0064001 2003-09-16

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993009622A1 (fr) * 1991-10-28 1993-05-13 Motorola, Inc. Signal de communication comprenant une composante pilote de dimension temporelle
KR19990082892A (ko) * 1998-04-03 1999-11-25 윈클만 존 디. 디지털 변조된 무선 주파수 신호를 위한 계측용 수신기
KR20010010456A (ko) * 1999-07-20 2001-02-15 윤종용 멀티 캐리어 코드분할다중접속 비동기전송모드의 송수신시스템
EP1089451A1 (fr) * 1999-04-02 2001-04-04 NTT DoCoMo, Inc. Dispositif et procede d'estimation de voie, dispositif et procede de demodulation, et dispositif et procede pour definir la frequence des evanouissements
KR20010055543A (ko) * 1999-12-10 2001-07-04 박종섭 고화질 텔레비전의 티시엠을 이용한 브이에스비 송/수신장치

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993009622A1 (fr) * 1991-10-28 1993-05-13 Motorola, Inc. Signal de communication comprenant une composante pilote de dimension temporelle
KR19990082892A (ko) * 1998-04-03 1999-11-25 윈클만 존 디. 디지털 변조된 무선 주파수 신호를 위한 계측용 수신기
EP1089451A1 (fr) * 1999-04-02 2001-04-04 NTT DoCoMo, Inc. Dispositif et procede d'estimation de voie, dispositif et procede de demodulation, et dispositif et procede pour definir la frequence des evanouissements
KR20010010456A (ko) * 1999-07-20 2001-02-15 윤종용 멀티 캐리어 코드분할다중접속 비동기전송모드의 송수신시스템
KR20010055543A (ko) * 1999-12-10 2001-07-04 박종섭 고화질 텔레비전의 티시엠을 이용한 브이에스비 송/수신장치

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EP1645126A4 (fr) 2011-04-13

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