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Multiresolution with Hierarchical Modulations for Long Term Evolution of UMTS

Correia, A. ; Souto, N.S. ; Dinis, R. ; Silva, J. C.

Eurasip Journal on Wireless Communications and Networking Vol. 2009, Nº 1, pp. 1 - 11, February, 2009.

ISSN (print): 1687-1499
ISSN (online): 1687-1472

Journal Impact Factor: 0,805 (in 2013)

Digital Object Identifier: 10.1155/2009/240140

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In the Long Term Evolution (LTE) of UMTS the Interactive Mobile TV scenario is expected to be a popular service. By using
multiresolution with hierarchical modulations this service is expected to be broadcasted to larger groups achieving significant
reduction in power transmission or increasing the average throughput. Interactivity in the uplink direction will not be affected by
multiresolution in the downlink channels, since it will be supported by dedicated uplink channels. The presence of interactivity
will allow for a certain amount of link quality feedback for groups or individuals. As a result, an optimization of the achieved
throughput will be possible. In this paper system level simulations of multi-cellular networks considering broadcast/multicast
transmissions using the OFDM/OFDMA based LTE technology are presented to evaluate the capacity, in terms of number of TV
channels with given bit rates or total spectral efficiency and coverage. multiresolution with hierarchical modulations is presented
to evaluate the achievable throughput gain compared to single resolution systems of Multimedia Broadcast/Multicast Service
(MBMS) standardised in Release 6.