The Study of Dynamic Sampling Loop for Wireless Baseband Applications
| Autor: | You-Hsien Lin, 林祐賢 |
|---|---|
| Rok vydání: | 2004 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 93 Direct sequence spread spectrum (DSSS) technique is used in IEEE 802.11, 802.11b and 802.11g wireless LAN systems. Unlike the wire channel, wireless communication uses radio as its medium and has more uncertainty with it. Therefore, WLAN frame format generally contains preamble field for synchronization. In this thesis, use the Barker spread preamble field to eliminate non-ideal channel effects including Additive White Gaussian Noise (AWGN), carrier frequency offset (CFO), carrier phase offset (CPO), and sampling clock offset. Therefore, the signal is degraded under non-ideal channel effects, and the exact and effectual timing synchronization algorithms were proposed. By the proposed algorithms, the baseband receiver can extract all the channel parameters only with the PLCP preambles and does not need any help from the MPDU which will reduce the CCK demodulator cost, dominated the cost of the system. In addition, the proposed algorithms can benefit the IEEE 802.11g system, which includes the CCK-OFDM signal flow － PLCP frame consists of the Barker and OFDM MPDU. Some simulation results, based on the proposed Matlab platform, have shown in this thesis. Finally, architectures of key components are discussed with gate counts of listed as well, where asynchronous-circuit techniques are used to implement the proposed architectures. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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