Extremely fast spreading factor adaptation in spread-spectrum networks

无线通信和网络服务正以爆炸性的速度渗透到加拿大社会，导致工程界制定了雄心勃勃的目标，以迅速提高其能力。未来无线服务的两个方面面临着特别的挑战。首先，未来的无线系统将需要服务于各种各样的应用，包括语音、高速互联网接入、实时多媒体等。第二，多媒体的流量强度会表现出高度的时间变化。这些挑战，加上无线资源的固有局限性和无线信道的时变特性，需要有效的资源分配和适应方案。提出的研究计划的目标是：1)设计、分析、集成和优化无线通信系统中的极快传输速率自适应方案；2)将这些方案集成到无线网络和多媒体应用中。Lee博士最近的出版物提出了一种基于扩展码的方法，通过该方法，无线链路可以非常快地调整其数据传输速率以适应无线信道条件。他的初步工作还表明，在固定的误码率下，数据传输速率对信道条件的快速适应可以使数据吞吐量比现有的传输技术提高许多个数量级。因此，预计所提出的研究将导致无线传输系统大幅增加数据吞吐量，并集成通信系统的其他组件，如符号内容检测，纠错编码和芯片同步。这些组件的联合设计和优化将产生一个系统，该系统将显著提高网络应用的服务质量，特别是无线移动网络中的实时多媒体。

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.