Research On Cross-Layer Design And Joint-Optimization For Multiband OFDM UWB Wireless Communications

Ultra Wide-Band (UWB) technology attracts the world by its high data rate, low cost and low power consumption while coexisting with other wirless communication sytems. Now it is also looked as one of the key technologies for the next generation wireless communication systems.At the same time, the layered method, which is based on OSI model, is made use of very well in wireless research during the past several decades. But the increasement of requirement is challenging this kind of design philosophy. UWB wireless communication has to support various profiles and quality of service request. Thus, it is crucial to utilize the characteristics of different layers to achieve the design of cross-layer in order to promote the performance of the whole UWB network.This dissertation is supported by National High Technology Program (863 Program)"Key Technology Research and Demo Development of Multi-band UWB Wireless Communications" (2005AA123320). The main content involves PHY-MAC cross-layer design and optimization for maximizing the utility and minimizing total energy consume of MB-OFDM-UWB networkThere're six chapters in this dissertation.In chapter one, the classification of wireless network, main technologies of WPAN and the background of UWB are present, as well as the architechture of this dissertation.In chapter two, the PHY and MAC technology of multiband OFDM UWB system are introduced.In chapter three, the aim of cross-layer design and some cross-layer design methods of PHY-MAC and PHY-NETWORK are given. The goals and directions of UWB cross-layer desiegn are proposed.In chapter four, the performance of PHY and MAC technology is analyzed as well as the joint PHY-MAC performance. Based on the analysis above, a new network framework, which called"Exclusive Piconet", is proposed and its performance is evaluated.In chapter five, the joint implementation of PHY-MAC by FPGA is discussed, including the introduction of key techmonogy in realized baseband FPGA demo, the optimization of baseband FPGA demo, the framework of MAC implementation and the interface development between PHY and MAC.In chapter six, the summarization of the whole dissertaion and outlines the future research directions are given.