Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/14265
Title: Joint channel estimation and OFDM synchronization in multipath fading
Authors: LIM WEI CHEE
Keywords: channel estimation, synchronization, OFDM, fading, timing offset, frequency offset
Issue Date: 27-Oct-2004
Source: LIM WEI CHEE (2004-10-27). Joint channel estimation and OFDM synchronization in multipath fading. ScholarBank@NUS Repository.
Abstract: OFDM is known to be robust against inter-symbol interference (ISI) resulting from multipath propagation, which is the limiting factor when wideband data is transferred over a wireless medium. However studies have shown that the transmission performance of OFDM is very sensitive to inaccurate frequency and time references. Moreover, in order to achieve coherent demodulation, channel gains need to be estimated. Hence effective joint channel estimation and synchronization is of paramount importance in OFDM and is the focus of this thesis. An OFDM framework complying with the IEEE 802.11a Wireless LAN standards is considered. We present an algorithm to estimate the channel, timing and frequency offset simultaneously in the time domain by using a maximum-likelihood technique. We consider both acquisition and tracking. Our algorithm is much simpler, more robust, accurate and reliable than existing joint estimation techniques because we avoided the need of a coarse synchronization algorithm.
URI: http://scholarbank.nus.edu.sg/handle/10635/14265
Appears in Collections:Master's Theses (Open)

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