Multimedia Communications, Multi-band Uwb Dynamic Resource Allocation Study

With the development of science and technology, people are more readily to communicate in a wireless way instead of a traditional wired one. Meanwhile, the carriers of information are also experienced a great change from simple text and voice data to multiple medias such as image and video. As a result, a large quantity of consumer electronic devices such as DVD players, digital videos, digital cameras, and MP3 players have rapidly entered personal homes. While people enjoy the wonderful life that multimedia technology brings to us, more challenges emerge to wireless communications - we will have to supply much more bandwidth and data rate than ever to meet the needs to transmit significantly increased information carried by the new medias.One of the ultra wideband (UWB) systems, multiband OFDM (MB-OFDM), emerged as a proposal for the high data rate physical layer standard of wireless personal area network (WPAN) recently. It has the ability to support data rate up to 480Mb/s and no doubt is a desired solution for the short range high data rate wireless applications in homes and offices. Because the power and the complexity of UWB devices are strictly confined by Federal Communications Commission of U.S., it will be very meaningful to conduct research on effectively allocating system resources as power, sub-channels and bits.The dissertation aims to research on the topic of multiuser resource allocation and optimization for MB-OFDM systems. Its main contents and contribution can be described as follows:(1) First reviewed current works in the field of wireless communications and resource allocation, then discussed the main method and challenges of them, and the main research contents of this dissertation was introduced based on the discussion.(2) Improved a time-frequency coded model by considering the frequency hopping technology utilized by MB-OFDM systems. In the model, subbands in a band group are grouped into a frame, and the allocation can be performed in any subcarrier of a frame.(3) Proposed a two-step subcarrier and power allocation algorithm, which transforms the original joint subcarrier and power allocation problem from a mixed integer nonlinear...