1. 1 WP 2.2 Propagation and Diversity Candida Spillard Torino, December 2003

2. 2 What will WP2.2 provide? Information for Link Budgets: Link and service availabilities Percentages of link downtimes due to excessive fading, Doppler, multipath, scintillation… Inputs to modulation and coding simulations Effects on performance of Scintillation, Doppler and Multipath Fade mitigation techniques Improvements in performance using Caching, Diversity, adaptive modulation and coding Optical link budgets Input for test sessions

3. 3 Who needs it? WP 1: Applications and services Link budgets WP 2: Communications links and networking effect of scintillation and multipath on modulation and coding schemes WP 3.3: Steerable antenna technology: signal processing aspects Scintillation and multipath characteristics WP 3.4: Optical communications terminals Optical link budgets WP 4: System testbed Inputs for test sessions

4. 4 Previous work The HeliNet Project provided: Cumulative distributions of received signal level Theoretical diversity studies Site diversity model Models of Rain scatter interference Polarisation diversity Ice scatter COST 280 provided: Basic time diversity model

5. 5 Who does it (and when)

6. 6 What we deliver Month 5: Survey of work on channel modelling, diversity and fade mitigation techniques Month 10: Topology and mobility effects on link margins Month 10: Inputs to planning test sessions WP 4.1 Month 11: Link budget calculations for WP 3.4 Month 12: Propagation channel simulator Month 15: Fade mitigation techniques for HAPs at Ka-band Month 15: Refinement of model, if necessary, after tests

7. 7 Document Properties