Multiresolution with hierarchical modulations for long term evolution of UMTS

Authors:
Américo Correia;Nuno Souto;Armando Soares;Rui Dinis;João Silva
Affiliations:
Instituto de Telecomunicações, Lisboa, Portugal and Instituto Superior de Ciências do Trabalho e da Empresa, Lisboa, Portugal;Instituto de Telecomunicações, Lisboa, Portugal and Instituto Superior de Ciências do Trabalho e da Empresa, Lisboa, Portugal;Instituto Superior de Ciências do Trabalho e da Empresa, Lisboa, Portugal;Instituto de Telecomunicações, Lisboa, Portugal;Instituto de Telecomunicações, Lisboa, Portugal and Instituto Superior de Ciências do Trabalho e da Empresa, Lisboa, Portugal
Venue:
EURASIP Journal on Wireless Communications and Networking - Special issue on OFDMA architectures, protocols, and applications
Year:
2009

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Abstract

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.