Extremely fast spreading factor adaptation in spread-spectrum networks

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Wireless communication and networking services are penetrating Canadian society at an explosive rate, resulting in the engineering community setting ambitious goals to rapidly advance their capabilities.  Two aspects of future wireless services present particular challenges.  First, future wireless systems will need to service a wide variety of applications, including voice, high-speed internet access, real-time multimedia, etc.  Second, the multimedia will exhibit a high degree of temporal variation in its traffic intensity.  These challenges, together with the inherent limitation of wireless resources and the time-varying nature of wireless channels, call for efficient resource allocation and adaptation schemes. The objectives of the proposed research program are: 1) to design, analyze, integrate, and optimize extremely fast transmission rate adaptation schemes in wireless communication systems, and 2) to integrate these schemes into wireless networks and multimedia applications.       Dr. Lee's recent publications presented a spreading-code-based method by which a wireless link can adapt its data transmission rate extremely fast to the wireless channel condition. His preliminary work also shows that the rapid adaptation of data transmission rate to the channel condition can increase the data throughput, for a fixed bit error probability, by many orders of magnitude over the existing transmission technologies. Therefore, it is anticipated that the proposed research will lead to a wireless transmission system with dramatically increased data throughput, and the integration of other components of communication systems such as symbol content detection, error correction coding, and chip synchronization. Joint design and optimization of these components will result in a system that will dramatically improve network applications' quality of service, with particular focus on real-time multimedia in a wireless mobile network.