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Lecture 12

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Joe Christensen
Joe Christensen

The document discusses several topics related to digital broadcasting systems including: 1. DAB architecture and DVB container which are used for digital audio/video broadcasting over different mediums. 2. Unidirectional distribution systems which have limitations due to asymmetric bandwidth but can optimize transmissions through techniques like cyclic repetition. 3. Digital Audio Broadcasting (DAB) standards which use COFDM to transmit multiple audio and data services over radio frequencies with high quality and robustness.

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Broadcast Systems ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Typical Client Server Application Client IBM Server Sends a data request Server sends a huge volume of data
Unidirectional distribution systems ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Typical Personalized Services – Broadcast Services ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Cyclic Repetition ,[object Object],[object Object]
Unidirectional distribution service provider service user sender receiver receiver receiver . . . unidirectional distribution medium A A A A A A A B B B B optimized for expected access pattern of all users individual access pattern of one user 
Structuring transmissions - broadcast disks ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],A B C A B C flat disk A A B C A A skewed disk A B A C A B multi-disk
Broadcast Patterns ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Broadcast Patterns ,[object Object],[object Object]
 
Digital Audio Broadcasting ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Digital Audio Broadcasting ,[object Object],[object Object],[object Object],[object Object],[object Object]
Digital Audio Broadcasting ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
DAB: Digital Audio Broadcasting ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Orthogonal Frequency Division Multiplex (OFDM) ,[object Object],Amplitude f subcarrier: SI function= ,[object Object],[object Object],k 3 f t c sin(x) x
OFDM II ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Real environments ,[object Object],[object Object],[object Object],[object Object],fade out fade in impulse response OFDM symbol OFDM symbol OFDM symbol t analysis window OFDM symbol T data OFDM symbol OFDM symbol
Examples for DAB coverage
DAB transport mechanisms ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Transmission frame synchronization channel SC main service channel FIC MSC null symbol phase reference symbol data symbol data symbol data symbol . . . . . . symbol T u frame duration T F guard interval T d L 0 0 1 2 L-1 1 L fast information channel FIC
DAB sender Trans- mitter Trans- mission Multi- plexer MSC Multi- plexer ODFM Packet Mux Channel Coder Audio Encoder Channel Coder DAB Signal Service Information FIC Multiplex Information Data Services Audio Services Radio Frequency FIC: Fast Information Channel MSC: Main Service Channel OFDM: Orthogonal Frequency Division Multiplexing 1.5 MHz f carriers
DAB receiver Packet Demux Audio Decoder Channel Decoder Independent Data Service Audio Service Controller Tuner ODFM Demodulator User Interface FIC Control Bus (partial) MSC
Audio Coding ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Bit Rate Management ,[object Object],[object Object],[object Object],[object Object],[object Object]
Example of a reconfiguration D1 D2 D3 D4 D5 D6 D7 D8 D9 Audio 1 192 kbit/s PAD Audio 2 192 kbit/s PAD Audio 3 192 kbit/s PAD Audio 4 160 kbit/s PAD Audio 5 160 kbit/s PAD Audio 6 128 kbit/s PAD DAB - Multiplex D1 D2 D3 D4 D5 D6 D7 D8 D9 Audio 1 192 kbit/s PAD Audio 2 192 kbit/s PAD Audio 3 128 kbit/s PAD Audio 4 160 kbit/s PAD Audio 5 160 kbit/s PAD Audio 7 96 kbit/s PAD DAB - Multiplex - reconfigured Audio 8 96 kbit/s PAD D10 D11
Dynamic Reconfiguration Possibilities ,[object Object],[object Object],[object Object]
Multimedia Object Transfer Protocol ,[object Object],[object Object]
MOT standard Protocol ,[object Object],[object Object],[object Object],Header Core Header Extension Body
MOT standard Protocol ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Digital Video Broadcasting (DVB) ,[object Object],[object Object],[object Object],[object Object],[object Object]
Digital Video Broadcasting (DVB) SDTV EDTV HDTV Multimedia PC DVD, etc. Terrestrial Receiver Cable Multipoint Distribution System Satellites DVB Digital Video Broadcasting Integrated Receiver-Decoder DVB-S DVB-C DVB-T
DVB ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Transport Stream
DVB Container multimedia data broadcasting MPEG-2/DVB container single channel high definition television MPEG-2/DVB container HDTV multiple channels standard definition MPEG-2/DVB container SDTV multiple channels enhanced definition MPEG-2/DVB container EDTV
Example: high-speed Internet access ,[object Object],[object Object],[object Object]
DVB Internet Options DVB-S adapter PC Internet TCP/IP leased line service provider information provider satellite provider satellite receiver
Convergence of broadcasting and mobile comm. ,[object Object],[object Object],[object Object],mobile terminal DVB-T, DAB (TV plus IP data) GSM/GPRS, UMTS (IP data) MUX Internet TV broadcaster ISP mobile operator TV data broadcast interaction channels
Classification ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Classification ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
HDTV Resolution ,[object Object],[object Object],[object Object],Tyoical Data Rates of DVB : 5-30 MBPS
Profiles for Data Broadcasting ,[object Object],[object Object],[object Object],[object Object]
Summary of MPEG-2 Compression Capability
Comparison

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Lecture 12

  • 1.
  • 2. Typical Client Server Application Client IBM Server Sends a data request Server sends a huge volume of data
  • 3.
  • 4.
  • 5.
  • 6. Unidirectional distribution service provider service user sender receiver receiver receiver . . . unidirectional distribution medium A A A A A A A B B B B optimized for expected access pattern of all users individual access pattern of one user 
  • 7.
  • 8.
  • 9.
  • 10.  
  • 11.
  • 12.
  • 13.
  • 14.
  • 15.
  • 16.
  • 17.
  • 18. Examples for DAB coverage
  • 19.
  • 20. Transmission frame synchronization channel SC main service channel FIC MSC null symbol phase reference symbol data symbol data symbol data symbol . . . . . . symbol T u frame duration T F guard interval T d L 0 0 1 2 L-1 1 L fast information channel FIC
  • 21. DAB sender Trans- mitter Trans- mission Multi- plexer MSC Multi- plexer ODFM Packet Mux Channel Coder Audio Encoder Channel Coder DAB Signal Service Information FIC Multiplex Information Data Services Audio Services Radio Frequency FIC: Fast Information Channel MSC: Main Service Channel OFDM: Orthogonal Frequency Division Multiplexing 1.5 MHz f carriers
  • 22. DAB receiver Packet Demux Audio Decoder Channel Decoder Independent Data Service Audio Service Controller Tuner ODFM Demodulator User Interface FIC Control Bus (partial) MSC
  • 23.
  • 24.
  • 25. Example of a reconfiguration D1 D2 D3 D4 D5 D6 D7 D8 D9 Audio 1 192 kbit/s PAD Audio 2 192 kbit/s PAD Audio 3 192 kbit/s PAD Audio 4 160 kbit/s PAD Audio 5 160 kbit/s PAD Audio 6 128 kbit/s PAD DAB - Multiplex D1 D2 D3 D4 D5 D6 D7 D8 D9 Audio 1 192 kbit/s PAD Audio 2 192 kbit/s PAD Audio 3 128 kbit/s PAD Audio 4 160 kbit/s PAD Audio 5 160 kbit/s PAD Audio 7 96 kbit/s PAD DAB - Multiplex - reconfigured Audio 8 96 kbit/s PAD D10 D11
  • 26.
  • 27.
  • 28.
  • 29.
  • 30.
  • 31. Digital Video Broadcasting (DVB) SDTV EDTV HDTV Multimedia PC DVD, etc. Terrestrial Receiver Cable Multipoint Distribution System Satellites DVB Digital Video Broadcasting Integrated Receiver-Decoder DVB-S DVB-C DVB-T
  • 32.
  • 34. DVB Container multimedia data broadcasting MPEG-2/DVB container single channel high definition television MPEG-2/DVB container HDTV multiple channels standard definition MPEG-2/DVB container SDTV multiple channels enhanced definition MPEG-2/DVB container EDTV
  • 35.
  • 36. DVB Internet Options DVB-S adapter PC Internet TCP/IP leased line service provider information provider satellite provider satellite receiver
  • 37.
  • 38.
  • 39.
  • 40.
  • 41.
  • 42. Summary of MPEG-2 Compression Capability