Lecture 12

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

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]

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

Lecture 12

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Lecture 12