Details of Grant 

EPSRC Reference:	GR/R66685/01
Title:	SOFT-CAPACITY MULTI-CARRIER MODULATION FOR PACKET VIDEO TRANSMISSION
Principal Investigator:	Ghanbari, Professor M
Other Investigators:	Jones, Dr E
Researcher Co-Investigators:
Project Partners:
Department:	Computing and Electronic Systems1
Organisation:	University of Essex
Scheme:	Standard Research (Pre-FEC)
Starts:	01 October 2002	Ends:	31 December 2005	Value (£):	204,355
EPSRC Research Topic Classifications:	Mobile Computing Networks & Distributed Systems
EPSRC Industrial Sector Classifications:
Related Grants:
Panel History:	Panel Date Panel Name Outcome 06 Nov 2001 Systems Level People and Interactivity Nov 2001 Deferred
Summary on Grant Application Form
With the advent of low cost digital signal processing, mufti-carrier modulation in its various forms has become a well established modulation method. It is also expected to be a serious contender for fourth generation wireless networks. The aim of this proposal is to look well beyond current standardisation work to research the opportunities offered by mufti-carrier modulation (OFDM in particular) to offer desirable soft-capacity properties for packet services. That is, capacity that can be conveniently adjusted in accordance with the perceived sub-channel signal-to-noise ratio. If capacity is less than ideal, a trade-off becomes possible - either send only the higher priority packets or accept a transmission delay. Using such methods based on hierarchical QAM constellations, it would be possible to make speculative transmission attempts without unduly compromising either high priority information or traffic in other sub-channels. Soft-capacdy OFDM offers interesting opportunities for video (and mufti-media) services over future broadband pack-mode wireless and wireline communication systems. Modem SNR scalable video coding with its mufti-priority packetisation would appear well suited to the features of soft-capacity OFDM. Thus packet distribution algorithms, which consider both capacity and priority in a resource limited environment, are an important aspect of this research. We note that what mattes ultimately is the successful transmission of necessary packets of information, either by 'conservative' modulation or by error correction. This project researches the boundary between these two approaches as the channel conditions continually change.
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Organisation Website:	http://www.sx.ac.uk