WO2010137507A1 - Appareil de communication - Google Patents

Appareil de communication Download PDF

Info

Publication number
WO2010137507A1
WO2010137507A1 PCT/JP2010/058469 JP2010058469W WO2010137507A1 WO 2010137507 A1 WO2010137507 A1 WO 2010137507A1 JP 2010058469 W JP2010058469 W JP 2010058469W WO 2010137507 A1 WO2010137507 A1 WO 2010137507A1
Authority
WO
WIPO (PCT)
Prior art keywords
transmission
data
communication apparatus
signal
signals
Prior art date
Application number
PCT/JP2010/058469
Other languages
English (en)
Japanese (ja)
Inventor
博昭 平井
Original Assignee
三菱電機株式会社
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
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to JP2011515993A priority Critical patent/JPWO2010137507A1/ja
Publication of WO2010137507A1 publication Critical patent/WO2010137507A1/fr

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0041—Arrangements at the transmitter end

Definitions

  • the present invention relates to a communication apparatus that performs data transmission requiring real-time characteristics on a wireless transmission channel.
  • Non-Patent Document 1 the luminance signal Y and the color difference are used as 4: 2: 2 component digital parallel interface of the size used in television broadcasting such as NTSC (National Television System Committee) system and PAL (Phase Alternating Line) system. It is defined that signals CB and CR are bundled in a digital bus. When the bundled signals are sampled at 27 MHz, for example, if the gradation is defined by 10 bits, the signal is 270 Mbps (in the case of Japanese television broadcasting).
  • NTSC National Television System Committee
  • PAL Phase Alternating Line
  • NTSC video signal Video signal
  • SAV Start of Active Video data
  • EAV End of Active Video data
  • a serial digital interface for efficiently transmitting a video signal as described above is standardized in Non-Patent Document 2 below, and is called SD-SDI (Standard Definition Serial Digital Interface).
  • SD-SDI Standard Definition Serial Digital Interface
  • HD-SDI High Definition SDI
  • 3G-SDI Third Definition SDI having a transmission band of about 3 Gbps are about the following non-patent documents 3 and 4 with the development of high definition television broadcasting. Each is planned.
  • Non-Patent Document 5 describes a method for realizing SDI transmission with a small number of wires.
  • Non-Patent Document 5 Since the above-mentioned conventional technology (the technology described in Non-Patent Document 5) is realized on the premise that there is almost no communication error by using a metal cable or an optical fiber cable, the communication error frequently occurs. There is a problem that it can not be applied to wireless communication that performs communication control on the premise of. In recent years, broadband video signals have low delay and low cost for the purpose of reducing wiring cost, wiring cost, and physical cost for wiring. The realization of a wireless communication system that can transmit at
  • the present invention has been made in view of the above, and it is an object of the present invention to obtain a communication apparatus capable of low-latency transmission of a large amount of data via a wireless transmission channel.
  • the present invention is a communication apparatus on the transmission side of a data transmission system, which converts transmission data into parallel data to generate a plurality of data strings, and In order to generate a redundant data string for performing error correction on the receiving side based on a plurality of data strings, and to detect a transmission error on the receiving side for each of the plurality of data strings and the redundant data string.
  • transmission means for wirelessly transmitting one or more of them.
  • FIG. 1 is a diagram showing an example of the configuration of a transmission side communication apparatus in a data transmission system.
  • FIG. 2 is a diagram showing an example of the configuration of video data to be subjected to channel coding processing.
  • FIG. 3 is a diagram showing an example of a signal obtained by performing the transmission path coding process.
  • FIG. 4 is a diagram showing the correspondence on the time axis of video data, a parallel clock, and a timing signal (horizontal synchronization signal) among input signals to the transmission signal generation unit.
  • FIG. 5 is a diagram showing data after performing 10 to 3 parallel-parallel conversion.
  • FIG. 6 is a diagram showing a data configuration after setting a synchronization signal (specified fixed pattern) in an invalid period.
  • FIG. 7 is a diagram illustrating an exemplary configuration of a transmission device.
  • FIG. 8 is a view showing an example of the configuration of a communication apparatus on the receiving side in the data transmission system.
  • FIG. 9 is a diagram showing an example of a general BTR process.
  • FIG. 10 is a diagram illustrating an exemplary configuration of a receiving device.
  • FIG. 1 is a diagram showing an example of the configuration of a transmission side communication apparatus in a data transmission system. Note that only the components related to the transmission operation are shown.
  • the communication device illustrated in FIG. 1 includes a transmission signal generation unit 10 and a transmission unit 11.
  • the transmission signal generation unit 10 generates a transmission signal using the illustrated input signals (video data, parallel clock, timing signal, auxiliary data), and outputs the transmission signal as parallel data together with the parallel clock.
  • the transmission unit 11 includes a plurality of transmission devices, and each transmission device receives any one of the transmission signals output in parallel from the transmission signal generation unit 10, executes predetermined transmission processing, Space transmission to the receiving communication device). Note that some transmission devices spatially transmit transmission signals generated based on redundant data for performing error correction on the reception side.
  • a transmitting device for transmitting actual data hereinafter referred to as “first transmitting device if necessary” and “differently referred to as necessary”
  • a transmitting device for transmitting redundant data hereinafter referred to as necessary
  • the ratio of the first transmission device to the second transmission device is determined in consideration of the occurrence rate of transmission errors in the used transmission line, the transmission quality required by the system, and the like.
  • the transmission signal generation unit 10 sequentially performs each processing of parallel / parallel conversion, timing information addition, synchronization pattern addition, channel coding, CRC addition, and scrambling on input video data.
  • input video data that is parallel data is converted into parallel data according to the number of transmission devices included in the transmission unit 11. Specifically, it is converted into parallel data (a plurality of data strings) having the same number of parallels as the number of transmission devices (the number of first transmission devices) for transmitting actual data.
  • timing information addition process information (alternative timing information) having the same purpose as the vertical and horizontal timing information (SAV, EAV) when forming the screen, which is included in the normal video data, is It is added to each of a plurality of data strings obtained by performing the parallel-to-parallel conversion processing.
  • SAV, EAV vertical and horizontal timing information
  • the synchronization pattern (fixed bit string known on the reception side) used when the reception side of the signal transmitted from each transmission device performs timing synchronization as communication data is added with the above alternative timing information.
  • each data string is used so that the communication apparatus on the receiving side can perform timing synchronization for each data string. Add synchronization pattern to.
  • each data string to which the above-mentioned synchronization pattern is added is coded.
  • redundant data is generated to restore the signal that has become a transmission error on the receiving side.
  • an error detection code for checking on the receiving side whether or not the data is normally received for each of a plurality of code word sequences obtained by performing the above-mentioned channel coding process
  • Add CRC CRC
  • This randomization process is a process of rearranging bits so that the ratio of bits having a value of 0 and bits having a value of 1 becomes equal in data during space transmission, and bit synchronization or a frame on the receiving side is performed. It is performed for the purpose of facilitating timing synchronization and channel state detection.
  • channel coding processing in an environment where five transmission paths can be used and four out of five can be transmitted without errors will be described.
  • the communication apparatus on the transmission side uses five transmission devices, transmits actual data in four of them, and transmits redundant data in the remaining one.
  • channel coding processing channel coding processing is performed on data of the configuration shown in FIG. In FIG. 2, video data (actual data) is a 4-bit value.
  • X k indicates the k-th video data
  • X m indicates the m-th bit in one video data.
  • Video data (4 bits of information transmitted simultaneously) can be reproduced (restored). For example, when the first bit in the k-th video data becomes a transmission error, it can be restored by executing the processing shown in the following equation (2). The method of determining the bit that caused the transmission error by the communication apparatus on the receiving side will be described in the description of the operation on the receiving side.
  • a video data to be input to the transmission signal generation unit 10 is a 10-bit value, and an operation example in the case of parallel transmission of the video data according to the number of transmission devices included in the transmission unit 11 will be shown. Note that there are three transmission devices constituting the transmission unit 11, and transmission is performed in an environment where a transmission error may occur in a maximum of one system. That is, real data is transmitted by two systems, and redundant data is transmitted by the remaining one system.
  • FIG. 4 shows correspondence among video data, a parallel clock (described as a clock in FIG. 4), and a timing signal (horizontal synchronization signal) among input signals to the transmission signal generation unit 10 on a time axis.
  • FIG. In addition to the illustrated horizontal synchronization signal, the vertical synchronization signal is also included in the timing signal, but only the horizontal synchronization signal necessary for the description here is shown.
  • the clock for drawing is 27 MHz. Therefore, the signal bandwidth as video data is 270 Mbps.
  • drawing is performed using a synchronization signal as a cue.
  • each transmitting device performs 135 Mbps transmission in space transmission so that a signal bandwidth of 270 Mbps can be achieved for any two systems.
  • the transmission signal generation unit 10 first performs simple 5-to-1 parallel-serial conversion processing (2 bits in which the input 10-bit parallel video data is made to correspond to the number of transmission paths used for transmission of actual data). Executes a process of converting into parallel video data, and adds timing information and a synchronization pattern to the video data of 2 systems, and then executes the transmission path coding process described above to generate 2 systems of data. By expanding into 3 systems of data (2 systems of real data and 1 system of redundant data), 10 to 3 parallel / parallel conversion is performed. The data after performing this conversion is shown in FIG. As illustrated, the horizontal synchronization signal, which is one clock wide in FIG. 4 (before conversion), is extended to five clocks.
  • FIG. 6 is a diagram showing a data configuration after setting a synchronization signal (specified fixed pattern) in the invalid period.
  • the specific fixed pattern which is timing information, is a bit string unique to each system and known at the receiving side.
  • the transmission signal generation unit 10 removes the horizontal synchronization signal running in parallel. Even if the horizontal synchronization signal is removed, the reception side can generate (restore) the horizontal synchronization signal by finding a specific unique pattern for each channel.
  • FIG. 7 is a view showing a configuration example of a transmission device, and the transmission device shown includes a level conversion unit 12, a light emission unit 13 and a lens 14.
  • the level conversion unit 12 performs conversion so that the input electrical signal has a desired signal level, and the issuing unit 13 causes an LED or LD (Laser Diode) to emit light according to the signal after the level conversion. .
  • the lens 14 condenses and transmits the light from the light emitting unit 13. Depending on the distance, a lens may not be necessary.
  • the illustration of light shows an example for multiplexing a plurality of signals in space, and the transmitting device may multiplex signals using different frequencies instead of using light. Even if the same frequency is used, CDMA is used to change code spreading, MIMO using antenna multiplexing is used, or millimeter wave communication with high linearity and optical communication with different wavelengths are used respectively. Also good.
  • FIG. 8 is a diagram showing a configuration example of a communication apparatus on the receiving side in the data transmission system according to the present invention. Note that only the components related to the receiving operation are shown.
  • the communication device shown in FIG. 8 includes a receiving unit 20 and a signal reproduction unit 21.
  • the receiving unit 20 is composed of a plurality of receiving devices, and each receiving device receives any one of a plurality of signals spatially multiplexed and transmitted from the communication apparatus on the opposite side of transmission, and executes a predetermined reception process.
  • To the signal reproduction unit 21 To the signal reproduction unit 21.
  • the signal reproduction unit 21 reproduces (restores) the data transmitted from the communication apparatus on the transmission side based on the input signal from the reception unit 20.
  • the redundant data input at the same time is used to restore the data that caused the transmission error. Do.
  • the operation of the signal reproduction unit 21 will be described in detail.
  • the signal reproduction unit 21 performs BTR (Bit Timing Recovery), transmission path state detection, descrambling, CRC check, transmission path decoding, frequency timing synchronization, frame timing synchronization, parallel-parallel conversion, and the like for input parallel data. Implement each process in order.
  • FIG. 9 is a diagram showing an example of a general BTR process. In BTR processing, oversampling is performed on a transmission signal. FIG. 9 shows an example in which a 25 Mbps transmission signal is oversampled by four times.
  • a moving average is performed on each sampling value acquired by executing oversampling, at an integral multiple of the oversampling value (an integer multiple of 4 in the example of FIG. 9), and a correlation value is generated at a bit period. .
  • the transmission clock is regenerated by detecting the high (or low) position of the correlation value as the bit switching timing.
  • the communication apparatus on the receiving side performs signal regeneration without using the signal (data) from this transmission path. That is, the data that has become a transmission error is restored based on the normally received data and the redundant data, and signal generation is performed using the restored data and the normally received data.
  • the transmission path state detection process the state of the transmission path (the transmission path between the transmitting device and the corresponding receiving device) is detected, and the reliability of the signal transmitted through each transmission path, that is, a transmission error occurs. Determine if you are not. Also, in this process, in addition to detecting the state of the transmission path, for example, monitoring the power supply and component abnormal state of the receiving device, periodically transmitting fixed patterns (fixed patterns known on the receiving side) from the transmitting side. In this case, a signal line with low reliability is detected by performing fixed pattern detection, and when transmitting signals at the same timing from the transmitting side, observe simultaneously the signal patterns output from the receiving device. An error within an assumed range can be detected by (detecting a signal line whose detection signal does not go up) or the like.
  • the descrambling process a process opposite to the scrambling process performed by the communication apparatus on the transmission side (the transmission signal generation unit 10, see FIG. 1) is executed, and the bit string is returned in the original arrangement order.
  • the transmission quality between each device is confirmed. This is implemented in order to select data between devices with high communication quality from received data and use it to improve the reliability in reproducing video data. As an implementation, a check is performed on the one to which the CRC is added in the space transmission unit.
  • decoding processing is performed on the reliable signal data detected in the transmission path state detection processing, and transmission video data is reproduced.
  • the transmission video data reproduced by the transmission path decoding process is synchronized with the internal clock of the communication apparatus (the communication apparatus on the receiving side).
  • FIG. 10 is a diagram showing a configuration example of the receiving device, and shows a configuration example corresponding to the transmitting device shown in FIG.
  • the receiving device includes a lens 22, a photodiode 23, a transimpedance amplifier 24, a comparing unit 25, and a level converting unit 26.
  • the lens 22 condenses the incoming light signal.
  • the photodiode 23 converts the light collected by the lens 22 into an electrical signal
  • the transimpedance amplifier 24 converts a current signal, which is an electrical signal output from the photodiode 23, into a voltage signal.
  • the comparison unit 25 determines the voltage signal output from the transimpedance amplifier 24 and converts it into a signal of 0 and 1.
  • the level converter 26 adjusts the level of the signal output from the comparator 25.
  • a lens is unnecessary depending on the distance to the communication apparatus on the transmission side.
  • an amplifier that performs the same process may be provided without using the transimpedance amplifier 24 and the comparison unit 25. As long as it is a method that can be separated by each receiving device provided on the receiving side, if wireless communication is used, demodulation processing corresponding to the modulation processing performed on each of the transmitting devices provided on the transmitting side is performed , To reproduce the signal.
  • the communication apparatuses on both the transmitting side and the receiving side are provided with a plurality of transmitting / receiving means (sending device, receiving device), and are assumed in the wireless section among the plurality of devices. It was decided to transmit redundant data for error correction on the receiving side of a signal that has become a transmission error, using a number of devices according to the transmission quality. As a result, low delay transmission of a large amount of data can be realized in a wireless transmission channel where transmission errors are expected to occur frequently.
  • the present invention is useful for realizing low delay transmission of a large amount of data, and is particularly suitable for the transmission side communication apparatus of a data transmission system for realizing low delay transmission in a wireless transmission channel. .

Abstract

L'invention porte sur un appareil de communication situé côté émission d'un système de transmission de données, qui comprend une unité de génération de signaux d'émission (10) et une unité d'émetteur (11). L'unité de génération de signaux d'émission (10) convertit des données d'émission en données parallèles afin de générer une pluralité de séquences de données, et sur la base de la pluralité de séquences de données, génère des séquences de données redondantes à utiliser pour une correction d'erreur, et ajoute en outre des informations de détection d'erreur de transmission, servant à détecter des erreurs de transmission, à chacune de la pluralité de séquences de données et des séquences de données redondantes afin de générer une pluralité de signaux d'émission. L'unité d'émetteur (11) est constituée d'un nombre de dispositifs émetteurs égal à celui de la pluralité de signaux d'émission, et chaque dispositif émetteur émet sans fil un signal parmi la pluralité de signaux d'émission.
PCT/JP2010/058469 2009-05-28 2010-05-19 Appareil de communication WO2010137507A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2011515993A JPWO2010137507A1 (ja) 2009-05-28 2010-05-19 通信装置

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2009-129281 2009-05-28
JP2009129281 2009-05-28

Publications (1)

Publication Number Publication Date
WO2010137507A1 true WO2010137507A1 (fr) 2010-12-02

Family

ID=43222618

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2010/058469 WO2010137507A1 (fr) 2009-05-28 2010-05-19 Appareil de communication

Country Status (2)

Country Link
JP (1) JPWO2010137507A1 (fr)
WO (1) WO2010137507A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110431750A (zh) * 2017-03-22 2019-11-08 三菱电机株式会社 符号映射装置

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05130081A (ja) * 1991-11-08 1993-05-25 Toshiba Corp 通信システム及び通信システムにおける誤り訂正方式
JPH07319718A (ja) * 1994-05-20 1995-12-08 Fujitsu Ltd データ識別方法及び装置
JPH0936849A (ja) * 1995-07-20 1997-02-07 Hitachi Ltd ビット同期回路及びビット同期方式
JPH1028146A (ja) * 1996-07-12 1998-01-27 Fukushima Nippon Denki Kk 符号誤り訂正装置
JPH11341102A (ja) * 1998-02-16 1999-12-10 Nippon Telegr & Teleph Corp <Ntt> チャネル間スキュ―補償装置
JPH11355386A (ja) * 1998-06-08 1999-12-24 Matsushita Graphic Communication Systems Inc シリアルインターフェイス、及びこれを用いたモデム装置
JP2003046965A (ja) * 2001-05-23 2003-02-14 Sony Corp データ伝送方法及び装置
JP2004096612A (ja) * 2002-09-03 2004-03-25 Matsushita Electric Ind Co Ltd ディジタル映像信号の受信装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002064506A (ja) * 2000-08-17 2002-02-28 Ricoh Co Ltd データ転送方式
JP2004320087A (ja) * 2003-04-10 2004-11-11 Nec Corp 伝送システム

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05130081A (ja) * 1991-11-08 1993-05-25 Toshiba Corp 通信システム及び通信システムにおける誤り訂正方式
JPH07319718A (ja) * 1994-05-20 1995-12-08 Fujitsu Ltd データ識別方法及び装置
JPH0936849A (ja) * 1995-07-20 1997-02-07 Hitachi Ltd ビット同期回路及びビット同期方式
JPH1028146A (ja) * 1996-07-12 1998-01-27 Fukushima Nippon Denki Kk 符号誤り訂正装置
JPH11341102A (ja) * 1998-02-16 1999-12-10 Nippon Telegr & Teleph Corp <Ntt> チャネル間スキュ―補償装置
JPH11355386A (ja) * 1998-06-08 1999-12-24 Matsushita Graphic Communication Systems Inc シリアルインターフェイス、及びこれを用いたモデム装置
JP2003046965A (ja) * 2001-05-23 2003-02-14 Sony Corp データ伝送方法及び装置
JP2004096612A (ja) * 2002-09-03 2004-03-25 Matsushita Electric Ind Co Ltd ディジタル映像信号の受信装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110431750A (zh) * 2017-03-22 2019-11-08 三菱电机株式会社 符号映射装置
US10652071B2 (en) 2017-03-22 2020-05-12 Mitsubishi Electric Corporation Symbol mapping device
CN110431750B (zh) * 2017-03-22 2023-06-06 三菱电机株式会社 符号映射装置

Also Published As

Publication number Publication date
JPWO2010137507A1 (ja) 2012-11-15

Similar Documents

Publication Publication Date Title
US8760322B2 (en) Transmission of pathological data patterns
JP4192802B2 (ja) デジタル映像通信装置
US8369235B2 (en) Method of exchanging messages and transmitting and receiving devices
KR101247178B1 (ko) 연속한 동일한 숫자 감소를 위한 방법 및 시스템
CN1497883A (zh) 单载波传输系统及其方法
US6820230B2 (en) Self synchronous scrambler apparatus and method for use in dense wavelength division multiplexing
US8879612B2 (en) Transmission characteristic adjustment device, transmission device and method for adjusting transmission characteristic
US20060176991A1 (en) System for adjusting sampling timing of DLL circuit, method therefor and transmitter-receiver used therefor
CN108322483B (zh) 一种基于jesd204b协议的接收端电路的实现方法
JPH11284671A (ja) 信号処理回路および信号処理方法
WO2008035428A1 (fr) Terminal de communication, et procédé de réception du signal
KR101527114B1 (ko) 다중 입출력 무선통신 시스템에서 스트림별 서로 다른부호화 방식을 지원하는 격자 감소 기반의 신호 검출 장치및 방법
US20160173151A1 (en) Receiving device, communication system, and interference detection method
WO2010137507A1 (fr) Appareil de communication
JP2013239940A (ja) シリアル通信システム、画像形成システム及び送信装置
CN109688440B (zh) 基于fpga的视频信号传输方法、存储介质及智能电视
US20210367710A1 (en) Apparatus and method for sending side-channel bits on an ethernet cable
US7477168B2 (en) Apparatus for and method of processing data
US20110216783A1 (en) Sending apparatus, receiving apparatus, and transmission system
JP4888488B2 (ja) 通信端末装置および信号受信方法
JP6484409B2 (ja) 送信装置及び受信装置
Kawamoto et al. Field transmission of an uncompressed 8K ultra-high definition television optical signal with forward error correction codes
JP4533111B2 (ja) 送信装置および受信装置
JP2013046364A (ja) 送信装置、受信装置および送受信システム
JP2007274533A (ja) シリアル伝送用の送信装置，スクランブル処理方法，受信装置及びシステム

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 10780462

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2011515993

Country of ref document: JP

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 10780462

Country of ref document: EP

Kind code of ref document: A1