To meet diverse communication requirements of users, wireless systems must simultaneously support wide-area access (ubiquity) and local area performance (capacity). Multitiered wireless networks represent a natural design option that fulfills these joint goals. These networks contain radios designed with coverage areas that vary in their order of magnitude. Higher-tier radios, which have larger coverage, extend the network's reach while lower-tier radios target location-specific performance. This research studies the capacity and ubiquity supported by various multitier networks. As a demonstration of the benefits offered by such systems, topographic and demographic data for Susquehanna County, a rural and technology-poor county in Northern Pennsylvania, will be used to implement derived results and to devise a multitier network for that region. This design will take into consideration the extremely hilly propagation characteristics of the area; location of population centers; and communication requirements at these locations in order to better serve the needs of the county (e.g., provide satisfactory cellular coverage, deliver broadband access, promote distance learning initiatives, etc.). Overall, this research aims to develop a general and unified framework for spectrally efficient multitier systems. Specifically, it examines the case of full spectral reuse across tiers for various centralized and decentralized multitier configurations. In centralized networks, users communicate exclusively to access points, which control admission and route information. In non-centralized systems, such responsibilities are distributed over access points and users, and ad-hoc connections are possible. The key challenge lies in overcoming cross-tier interference produced by high spectral reuse. This research develops analytical methods that 1) model this interference; and 2) use signal processing, radio resource allocation, and access control techniques to jointly suppress it and deliver desired ubiquity and capacity. COVER SHEET FOR PROPOSAL TO THE NATIONAL SCIENCE FOUNDATION FOR NSF USE ONLY NSF PROPOSAL NUMBER DATE RECEIVED NUMBER OF COPIES DIVISION ASSIGNED FUND CODE DUNS# (Data Universal Numbering System) FILE LOCATION FOR CONSIDERATION BY NSF ORGANIZATION UNIT(S) (Indicate the most specific unit known, i.e. program, division, etc.) PROGRAM ANNOUNCEMENT/SOLICITATION NO./CLOSING DATE/if not in response to a program announcement/solicitation enter NSF 03-041 EMPLOYER IDENTIFICATION NUMBER (EIN) OR TAXPAYER IDENTIFICATION NUMBER (TIN) SHOW PREVIOUS AWARD NO. IF THIS IS A RENEWAL AN ACCOMPLISHMENT-BASED RENEWAL IS THIS PROPOSAL BEING SUBMITTED TO ANOTHER FEDERAL AGENCY? 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RESEARCH (SGER) (GPG II.D.1) VERTEBRATE ANIMALS (GPG II.D.5) IACUC App. Date HUMAN SUBJECTS (GPG II.D.6) Exemption Subsection or IRB App. Date INTERNATIONAL COOPERATIVE ACTIVITIES: COUNTRY/COUNTRIES INVOLVED (GPG II.C.2.j) HIGH RESOLUTION GRAPHICS/OTHER GRAPHICS WHERE EXACT COLOR REPRESENTATION IS REQUIRED FOR PROPER INTERPRETATION (GPG I.E.1) PI/PD DEPARTMENT PI/PD POSTAL ADDRESS PI/PD FAX NUMBER NAMES (TYPED) High Degree Yr of Degree Telephone Number Electronic Mail Address PI/PD NAME CO-PI/PD CO-PI/PD CO-PI/PD CO-PI/PD Page 1 of 2 0346945 CCR - COMMUNICATIONS RESEARCH NSF 02-111 07/22/03 240795445 Lehigh University 0032896000 Lehigh University Alumni Building 27 Bethlehem, PA. 180153005 CAREER:Capacity and Ubiquity in Multitier Wireless Networks 578,373 60 01/04/01 Electrical Engineering 610-758-6279 Bethlehem, PA 180153005 United States Shalinee Kishore PhD 2003 610-758-4517 skishore@lehigh.edu 808264444 Electronic Signature 400,000 CERTIFICATION PAGE Certification for Authorized Organizational Representative or Individual Applicant: By signing and submitting this proposal, the individual applicant or the authorized official of the applicant institution is: (1) certifying that statements made herein are true and complete to the best of his/her knowledge; and (2) agreeing to accept the obligation to comply with NSF award terms and conditions if an award is made as a result of this application. 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