Effect of Base Layer Bits-Share on DVB-H UEP schemes

Abstract

Unequal error protection (UEP) schemes for DVB-H can be realized either by redundant transmission of important Base Layer data (UEP-RT) or by giving higher FEC protection to important Base Layer data (UEP-FEC) as shown in the literature. UEP requires division of total source coding bits into Base Layer bits and Enhancement Layer bits with certain shares.In this paper we present the effect of Base Layer Bits-Share on the performance of the above two UEP schemes. It is shown with simulation results that for small Base Layer Bits-Shares such as 10% or 20% of the total source coding bits, UEP-RT outperforms UEP-FEC. Whereas for large Base Layer Bits-Share such as 30%, UEP-FEC is more effective.

Solving of the Boltzmann transport equation using two - term approximation for pure electronegative gases (SF6, CCl2F2)

“…It is seen that, the present calculation is in agreement with experimental and theoretical values (Settaouti and Settaouti, 2005), (Aschwanden, 1985), (Shimozuma et al, 1982), (Siddagangappa et al, 1982), but the theoretical results of (Itoh et al, 1993) lower than that of present results for all range of E/N values. which (α/N=η/N) is obtained in the present calculation is approximately equal to (361Td), in agreement with the results of: 361Td (Aschwanden, 1985), 362 Td (Tezcan et al, 2010), 362 Td (Itoh et al, 1993), 361Td (Mohammed, 2009), 362 Td (Itoh et al, 1988). The effective ionization coefficient is almost zero, since ionizing collisions are balanced by attaching collisions, and for E/N values smaller than the (E/N) limit , attachment processes become dominant, yielding negative values for the effective ionization coefficient as E/N is decreased and; on the other hand, for E/N values above the (E/N) limit , the effective ionization coefficient increases with increasing E/N values where the ionization collisions become dominant and the effect of the attachment processes is not significant.…”