Variable-to-Fixed Channel Coding Against Infrastructure Link Failures

Speaker: Osvaldo Simeone,
New Jersey Institute of TechnologyAbstract: Two models are discussed that illustrate the advantages of variable-to-fixed channel coding (i.e., the broadcast coding approach) for scenarios in which wireless communications is aided by an unreliable wired infrastructure. In the first scenario, a single macrocell, serving a number of outdoor users, is overlaid with a femtocell, which includes several home users. The femtocell is served by a home base station, which is connected to the macrocell base station via an unreliable connection (e.g., DSL). In the second scenario, a source communicates with a remote destination via a number of distributed relays. Communication from source to relays takes place over a (discrete or Gaussian) broadcast channel, while the relays are connected to the receiver via orthogonal and unreliable finite-capacity links.In both scenarios, link failures are assumed to be non-ergodic and unpredictable, and robust communications strategies are designed that deliver a variable information rate depending on the current (unknown) link conditions. Upper and lower bounds are derived on the achievable rates of interest, and some optimality conditions are obtained.Biography: Osvaldo Simeone received the M.Sc. degree (with honors) and the Ph.D. degree in Information Engineering from Politecnico di Milano, Milan, Italy, in 2001 and 2005 respectively. He is currently with the Center for Wireless Communications and Signal Processing Research (CWCSPR), at the New Jersey Institute of Technology (NJIT), Newark, New Jersey, where he is an Assistant Professor. His current research interests concern the cross-layer analysis and design of wireless networks with emphasis on information-theoretic, signal processing and queuing aspects. Specific topics of interest are: cognitive radio, cooperative communications, ad hoc, sensor, mesh and hybrid networks, distributed estimation and synchronization. Dr. Simeone currently serves as an Editor for IEEE Trans. Wireless Commun.Host: Urbashi Mitra, ubli@usc.edu, EEB 540, x04667

Location: Hughes Aircraft Electrical Engineering Center (EEB) - 248

Audiences: Everyone Is Invited

Contact: Gerrielyn Ramos