Cognitive Radio Networks for Dynamic Spectrum Management

The Hong Kong University of Science and Technology
Department of Computer Science and Engineering


PhD Thesis Defence


Title: "Cognitive Radio Networks for Dynamic Spectrum Management"

By

Mr. Juncheng Jia


Abstract

A fundamental evolution is witnessed in recent research and development of 
wireless communications: much effort is put on shifting from the current 
static spectrum management to a dynamic one, since the wireless industry 
is hindered by spectrum scarcity while most of allocated spectrum stays 
idle. To realize the paradigm of dynamic spectrum management, cognitive 
radio network is a promising way. In this thesis, we present our work on 
dynamic spectrum management and cognitive radio networking, under a 
unified framework including both economic and technological aspects. We 
first investigate the economical feasibility of dynamic spectrum 
management in the form of dynamic spectrum market. Market mechanisms are 
proposed to stimulate primary (licensed) users to open up their 
under-utilized spectrum bands for secondary (unlicensed) users. We further 
analyze the competitive behavior of the major players in wireless 
industry, wireless service providers, in such a spectrum market. Then we 
switch to the technical realization part. We address several unique issues 
within cognitive radio networking. One is about the spectrum sensing 
strategy of secondary nodes. A MAC protocol is proposed to conduct 
efficient spectrum sensing and accessing in ad hoc cognitive radio 
networks, taking the hardware constraints into consideration. Another is 
about spectrum heterogeneity. We propose a cooperative relaying scheme and 
prove the effectiveness with a real testbed. Finally, we describe our 
current work about cognitive radio network testbed construction. The 
testbed has both fine programmability and high speed, which is quite 
useful for concept verification and performance evaluation.


Date:			Monday, 17 August 2009

Time:			10:00am-12:00noon

Venue:			Room 3501
 			Lifts 25-26

Chairman:		Prof. Ping Gao (CBME)

Committee Members:	Prof. Qian Zhang (Supervisor)
 			Prof. Lin Gu
 			Prof. Bo Li
 			Prof. Vincent Lau (ECE)
 			Prof. Soung-Chang Liew (Inf. Engg., CUHK)


**** ALL are Welcome ****