Date of Award:

5-2012

Document Type:

Thesis

Degree Name:

Master of Science (MS)

Department:

Electrical and Computer Engineering

Committee Chair(s)

Jacob Gunther

Committee

Jacob Gunther

Committee

Todd K. Moon

Committee

Edmund Spencer

Abstract

The objective of the research for this thesis is to improve the performance of the Orthogonal Frequency Division Multiplexing (OFDM) system by minimising the impact of frequency offset at the receive end. OFDM is a popular standard used in wireless communication systems such as cellphone networks and broadband internet. In an OFDM system, the data symbols modulate the carrier signal at the transmitter. Usually, the receiver function generator performs the demodulation task. In the absence of frequency offset compensation, the transmitted symbols can not be effectively recovered upon reception. This leads to packet loss and a degradation of the Quality of Service (QoS) offered by the service provider.

Several approaches have been proposed to estimate the frequency offset at the receiver. Estimators based on Maximum Likelihood (ML) principle offer good system performance and are simple to implement. In this thesis an algorithm to estimate the frequency offsset is proposed. The objective of the algorithm is to minimise the probability of symbol error. The frequency estimate is chosen such that the probability of symbol error is minimised. The run-time performance of the system is improved as a part of the thesis.

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Comments

This work made publicly available electronically on December 21, 2012.

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