A Baseband Receiver for Fast Frequency Hopping Systems
| Autor: | Frank S. Tsai, 蔡尚峰 |
|---|---|
| Rok vydání: | 2001 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 89 Wireless Personal Area Network (WPAN) technology can bring more convenience into our future lives. The importance of WPAN can be seen from the vast amount of energy spent on developing WPAN related technology such as Bluetooth, 802.15, etc. WPAN technology requires better security and greater system capacity than other wireless technologies. Therefore, fast frequency hopping system is the most suitable physical layer system for WPAN technology. Although there are several accomplishments in the design of fast frequency hopping systems have been achieved, there are still several difficulties to over come. First of all, in a conventional fast frequency hopping system, timing recovery requires knowledge of received signal energy. Recent researches on timing recovery for fast frequency hopping requires either advanced analog circuit design or complicated fast digital circuits. In this thesis, new timing recovery method without the need of received signal energy is experimented. Second, it is difficult to design a fast frequency switching frequency synthesizers with large output frequency bandwidth. By modeling oscillators into functions, the frequency synthesizer can switch different frequency with zero acquisition time. During the development of the proposed circuits in this thesis, system simulations are required to ensure the correctness of the developed circuit. It was found that using the conventional way to simulate the entire frequency hopping system is time consuming and inefficient. After several derivations, it was found that by simplifying several equations, a more efficient channel model could be derived. This channel model not only saved time, but also was able to be written into Verilog code for gate level code verification. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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