Wireless channels have significant problems like multipath fading, delay spread, frequency selective fading. Guard bands/channel equalization techniques are employed to overcome these. However, these solutions are complex and don’t solve the issue of bandwidth scarcity. Thus, Orthogonal Frequency Division Multiplexing was introduced; a special case of Frequency Division Multiplexing where orthogonal subcarriers overlap in the frequency domain using lesser bandwidth without any inter-symbol interference.
The next challenge is to reduce the error rate in transmission. This thesis focuses on the noise created because of the non-linear input/output relationship of the power amplifier used. Different techniques used to linearize power amplifiers are compared. Predistortion was found to be most effective. Various predistortion schemes are compared and error rate performance evaluated for the Orthogonal Frequency Division Multiplexing system with and without Predistortion as well as for different modulation techniques. Dynamic Digital Predistortion paired with 8 Quadrature Amplitude Modulation was found to work most efficiently.
|Commitee:||Hamano, Fumio, Mozumdar, Mohammad|
|School:||California State University, Long Beach|
|School Location:||United States -- California|
|Source:||MAI 58/05M(E), Masters Abstracts International|
|Subjects:||Applied Mathematics, Electrical engineering, Technical Communication|
|Keywords:||Bit error rate, Communication systems, Feed-forward, OFDM, Power amplifier linearization, Predistortion|
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