Date of Award

Spring 2013

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Electrical & Computer Engineering

Program/Concentration

Electrical and Computer Engineering

Committee Director

Dimitrie Popescu

Committee Member

Jiang Li

Committee Member

Filip Cuckov

Call Number for Print

Special Collections LD4331.E55 A433 2013

Abstract

Orthogonal Frequency Division Multiplexing (OFDM) has recently gained a lot of attention as a promising new technology for Broadband Wireless Access. OFDM-based communication systems decompose a high rate data stream into a set of lower data rate streams that are transmitted simultaneously over multiple subcarriers. WiMAX is an efficient and reliable wireless transmission standard that employs OFDM transmission. Due to its flexibility and mobility, WiMAX is becoming a preferred air interface for next generation broadband wireless systems. OFDM systems, including WiMAX, are very sensitive to time offsets introduced by radio signal propagation between transmitters and receivers. The lack of time synchronization results in inter-symbol interference among the subcarriers and increased probability of error. In this thesis, the effects of time offset in OFDM systems are tested on WiMAX applications. Maximum Correlation and Minimum Difference techniques for time synchronization are presented and illustrated for a WiMAX system. MATLAB is used for simulation to implement an OFDM transmission and the WiMAX standard. An explanation of synchronization algorithms and estimation techniques are also provided, and Bit Error Rate (BER) plots are presented to evaluate system performance.

Rights

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DOI

10.25777/73nm-kp67

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