Four-Point Adaptive Sampling Time Synchronization in Wireless LAN

• Main Authors: Cheng-ya wu, 吳承亞
• Other Authors: 黃啟光
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/39635706261765749394

碩士 === 中華大學 === 電機工程學系(所) === 96 === In this thesis, we consider the sampling time offset (STO) estimation scheme that integrates correlations of the short preamble into the phase lock loop (PLL) scheme which is the feedforward and feedback synchronizer. For personal mobile communication, it is desirable to sample the signal at the lowest signal-to-noise ratio without increasing the complex of the synchronizer. A simple timing estimation that uses four samples and two samples of the correlation is introduced. Thus, we also present a new algorithm based on the feedforward and feedback PLL synchronizer by which STO can be adjusted symbol by symbol adaptively using four-point correlations of the short preamble. Performance characteristics of the STO estimation using the non-adaptive method and the adaptive mode are evaluated via numerical examples. Our results show that the proposed method can effectively reduce STO.