Blind CFO Estimation for Zero-Padded OFDM over Underwater Acoustic Channels

<p>In this thesis, we compare the performance and complexity of three existing blind carrier-frequency-offset (CFO) estimators when they are applied to estimate the residual Doppler shift for zero-padded OFDM transmissions over underwater acoustic channels: the null subcarrier based method, the O-M algorithm, and the Y-G algorithm. Performances of these three methods are evaluated by extensive numerical simulations and by data sets collected from the Mobile Acoustic Communication Experiment conducted off the coast of Martha's Vineyard, MA, July 23, 2010. Simulation results show that the Y-G algorithm always outperforms the O-M algorithm. As far as the fractional part of CFO is concerned, the Y-G algorithm can perform as good as the null subcarrier based method yet with a much lower computational complexity. When working with real data, the Y-G algorithm needs to be modified and integer CFO estimation based on a few null subcarriers is incorporated. Experimental results show that the modified Y-G algorithm, having lower complexity, performs slightly worse than the null subcarrier based method for small and moderate-size constellations, and becomes ineffective for a large constellation.</p>

Name thesis:degree_name

Master of Engineering

Discipline thesis:degree_discipline

Electrical Engineering

Year dc:date.available

2012

Author dc:creator

• Zhou, Wei

Contributors dc:contributor

• Peter Willett; Zhijie Shi
• Shengli Zhou

• Carrier frequency offset (CFO)
• zero-padded orthogonal frequency division multiplexing (ZP-OFDM)
• underwater acoustic communications (UWA)

Repository record dc:identifier

https://digitalcommons.lib.uconn.edu/gs_theses/267

OAI identifier oai:identifier

oai:digitalcommons.lib.uconn.edu:gs_theses-1305