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Selected Publications:

Spectrum Management and Optimization in Wireless Networks

The increased number of networked devices and the broadband nature of usage demands in next-generation heterogeneous wireless networks, coupled with the continuing scarcity of wireless bandwidth, will aggravate the need for efficient spectrum sharing. The goal of this research is to develop efficient network architecture and medium access control protocols that integrate the latest hardware and signal processing technologies for optimal bandwidth allocation and scheduling in high-throughput and hybrid/overlapped networking environments.

Distributed Data Dissemination in Multihop Wireless Networks

The main challenge in large-scale multihop wireless networking is to ensure the reliable and efficient transmission of high-bandwidth and mission-critical data, across multiple hops of unstable wireless links and through energy-limited and potentially uncooperative peers. A successful system design must allow dynamic adaptation to the time-varying characteristics of different layers of the network protocol stack. The goal of this research is to develop novel distributed computing theories and techniques for peer-to-peer communication and to promote cross-layer design for optimal network operation.

Peer Cooperation in Wireless Communication Networks

Collaborative network participants can jointly achieve advanced networking functions beyond simple relaying of data packets. They enable distributed network reconfiguration and autonomous tuning of software and hardware among peers, to support diverse and evolving application requirements and networking environments. However, the combination of mutual interference, network scale, decentralized control, and possible multihop radio instability, brings new challenges to the paradigm of intelligent collaboration in future generation wireless networks. The goal of this research is to create new theories and technologies toward promoting intelligent collaboration among the peer devices in a wireless system. We aim toward achieving efficient provisioning of resources and services, leveraging the benefit of joint-communication and joint-processing power of multiple wireless devices in proximity.

Adaptive Mobility Management for Wireless Inter-networking

Wireless technologies beyond the third generation are evolving toward real-time multimedia information access across multiple platforms. In order to support the ubiquitous availability of broadband applications, multiple access technologies, including the wired Internet, cellular networks, wireless local area networks, and mobile ad hoc networks, are expected to co-exist and interoperate, since no single system meets the ideal of high bandwidth, universal availability, and low cost. The goal of this research is to provide innovative solutions to network inter-connectivity and wireless resource management, so as to allow efficient and transparent services to multimedia users across heterogeneous networking platforms.

Transmission and Topology Control for Multimedia Streaming Applications and Services

Multimedia streaming applications and services impose difficult constraints on network design, requiring high bandwidth, low latency, and stable data transfer for smooth playback. These challenges are compounded with the prevalence of limited-bandwidth and unstable wireless access to support free mobility. The goal of this research is to develop new theories and algorithms for transmitting and receiving streaming data over time-varying pathways, based on a fundamental understanding of the tradeoffs among different system parameters including memory usage, playback delay, jitter tolerance, and computational complexity.

Cooperation and Clustering for Data Aggregation and Reconstruction in Sensor Networks

Cooperation and clustering are motivated by the need for scalability in large sensor networks, where the absence of centralized infrastructure and limited availability of power regeneration impose severe constraints on large-scale network operation. The goal of this research is to generate novel network architectures, network protocols, and analytical tools, for optimal distributed cooperation and clustering, in order to locally emulate centralized network functions and to leverage the correlation between different samples of a signal field.

Data Caching and Prefetching for Multimedia Networking and System Integration

In order to optimize uninterrupted service within and across heterogeneous access networks, network and user data should be replicated at strategically chosen locations within an integrated system. Duplication and distribution are key to robust information storage and retrieval, particularly under the volatile communication environment prevalent in wireless networks. The goal of this research is to develop efficient caching and prefetching algorithms for optimal network integration.


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Last updated February 2009.