Context-aware wireless networks

摘要: This thesis investigates context-aware wireless networks, capable to adapt their behavior the context and application, thanks ability of combining communication, sensing localization. Problems signals demodulation, parameters estimation localization are addressed exploiting analytical methods, simulations experimentation, for derivation fundamental limits, performance characterization proposed schemes experimental validation. Ultrawide-bandwidth (UWB) in certain cases considered non-coherent receivers, allowing exploitation multipath channel diversity without adopting complex architectures, investigated. Closed-form expressions achievable bit error probability novel architectures derived. The problem time delay (TDE), enabling network ranging measurement, is from a theoretical point view. New bounds on TDE derived case received signal partially known or unknown at receiver side, as often occurs due propagation adoption low-complexity estimators. Practical estimators, such energy-based revised compared with new bounds. The issue experimentation cooperative networks. algorithms able improve accuracy non-line-of-sight (NLOS) conditions evaluated measured data. With purpose enhancing coverage NLOS conditions, non-regenerative relaying techniques introduced ad hoc position estimators devised. An example given study UWB-RFID system detecting locating semi-passive tags. In particular deep investigation involving receivers deal problems multi-tag interference, synchronization mismatches clock drift presented. Finally, this others passive networks (e.g., radar) derived, also accounting different configurations monostatic multistatic