A Study of Dual Level Access to Digital Video Broadcasting Network

                                                                                                                     Thumrongrat Amornraksa

Computer Engineering Department, King Mongkut's University of

Technology Thonburi, Bangkok 10140, Thailand.


Peter Sweeney

Centre for Communication Systems Research, University of Surrey,

Guildford GU2 7XH, UK

Manuscript received June 25, 2002,

Revised January 10, 2003




This paper presents an encoding scheme for dual level access to digital video broadcasting network. The broadcast signal is generated by adding small information into the main data in such a way that the resultant signal can be broadcast via the existing channel without requiring extra bandwidth. At the receiver end, the received signal can be decoded into two different sets of data, giving two different levels of access. We investigate the possibility of employing the scheme for practical use by simulating its operations with a DVB system, in which the output signal generated from the scheme is broadcast through an AWGN channel. The scheme's performance is then examined to determine how well it performs in the presence of noise. Based on the simulation results, the possibility of using the scheme in practice is discussed.


Keywords: Dual level access scheme, direct sequence spread spectrum, digital signal processing




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