Multiresolution with Hierarchical Modulations for Long Term Evolution of UMTS
1 Instituto de Telecomunicações (IT), Av. Rovisco Pais, 1 Lisboa 1049-001, Portugal
2 Instituto Superior de Ciências do Trabalho e da Empresa (ISCTE ), Av. das Forças Armadas, Lisboa 1649-026 , Portugal
EURASIP Journal on Wireless Communications and Networking 2009, 2009:240140 doi:10.1155/2009/240140Published: 8 April 2009
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.