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"Adaptive Wireless Networking Using Cognitive Radios as a Building Block"

Dipankar Raychaudhuri

Dipankar ("Ray") Raychaudhuri
Professor and Director, WINLAB
Rutgers University

Thursday, March 31, 2005
1065 Kemper Hall
3 :10-4:00 p.m.

A welcoming reception and refreshments will be available before the talk at 2:45 in 1131 Kemper Hall.


This talk presents a discussion of cognitive software-defined radio as a building block for future adaptive wireless networks in which radio nodes collaborate in an ad-hoc manner to share spectrum and create useful network services. A number of proposed cognitive radio methods are introduced, including autonomous agile radios, reactive interference control, spectrum etiquette channel, Internet-based spectrum server and ad-hoc multi-hop collaboration. Preliminary simulation and experimental results are given for example cognitive radio schemes, and their relative complexity and performance are compared. The concept of building adaptive, self-organizing wireless networks using cross-layer PHY/MAC/network collaboration between programmable radio nodes is introduced. Protocol and hardware design issues for adaptive ad-hoc wireless networks are briefly discussed, and topics for future research in this area are identified in conclusion.


Dipankar Raychaudhuri is Professor, Electrical & Computer Engineering Department and Director, WINLAB (Wireless Information Network Lab) at Rutgers University. As WINLAB's Director, he is responsible for a cooperative industry-university research center with focus on next-generation wireless technologies. WINLAB's current research scope includes topics such as RF/sensor devices, MIMO/OFDM, spectrum management/cognitive radio, future 4G and WLAN systems, ad-hoc networks and pervasive computing. He is also the principal investigator for the NSF-funded "ORBIT" open-access wireless networking testbed now under development at Rutgers. He has previously held progressively responsible corporate R&D positions in the telecom/networking industry including: Chief Scientist, Iospan Wireless (2000-01), Assistant General Manager & Dept Head-Systems Architecture, NEC USA C&C Research Laboratories (1993-99) and Head, Broadband Communications Research, Sarnoff Corp (1990-92). Dr. Raychaudhuri obtained his B.Tech (Hons) from the Indian Institute of Technology, Kharagpur in 1976 and the M.S. and Ph.D degrees from SUNY, Stony Brook in 1978, 79. He is a Fellow of the IEEE.