Cost-, Spectrum-, and Energy-Efficient Distributed Collaborative
Beamforming Designs for Real-World Applications
By: Prof. Sofiène Affes
Director, NSERC CREATE PERSWADE Program,
Montreal, QC, Canada
Collaborative beamforming (CB), alternatively known as cooperative multi-antenna relaying, stands out today as a strong means to increase coverage, reliability, and capacity of various wireless networks by implementing through a set of terminals (sensor nodes, mobiles, network relays, soldier radios, vehicles, etc.) dual-hop transmissions between transmitter-receiver pairs when direct links would otherwise fail. Distributed CB (DCB) designs, in particular, lend themselves to distributed processing implementations that avoid the costly overhead required otherwise to broadcast the CB weights after their calculation by some master terminals.
Many impediments stand, however, between the exciting concept of DCB and its real-world and wide-use applicability. In this talk, we present novel DCB designs, obtained in closed form, that do not require any data exchange between terminals, yet properly cope, as dictated by a broad range of applications, with both scattered and interfered multi-antenna dual-hop transmissions under different power constraints. We also analyze the performance of these new DCB designs in terms of SNR and link-level throughput, both by newly established theoretical closed-form expressions and simulations to illustrate their spectrum, power, and computational-cost efficiencies in real-world operating conditions that account for various implementation imperfections.
About the Speaker
Dr. Sofienne Affes received the Diplôme d’Ingénieur in electrical engineering in 1992, and the Ph.D. degree with honors in signal and image processing in 1995, both from the École Nationale Supérieure des Télécommunications (ENST), Paris, France.
He has been since with INRS-ÉMT (former Telecommunications Center), University of Quebec, Montreal, Canada, as a Research Associate from 1995 till 1997, as an Assistant Professor till 2000, then as an Associate Professor till 2009. Currently he is a Full Professor in the Wireless Communications Group. His research interests are in wireless communications, CDMA/MC-CDMA/OFDM, statistical signal and array processing, adaptive space-time processing, MIMO, channel identification, synchronization and multiuser detection. Previously, he was involved in the European ESPRIT projects 2101 ARS on speech recognition in adverse environments at Cambridge University (CUED), UK, in 1991, and 6166 FREETEL on hands-free telephony at ENST (Département TSI), France, from 1993 to 1994.
In 1997 he participated in the major program in personal and mobile communications of the Canadian Institute for Telecommunications Research (CITR). From 1998 to 2002 he has been leading the radio-design and signal processing activities of the Bell/Nortel/NSERC Industrial Research Chair in Personal Communications at INRS-ÉMT, Montreal, Canada. He has been actively involved in a major project in wireless of Prompt Inc. (Partnerships for Research on Microelectronics, Photonics and Telecommunications).