Chaos-based communication piqued interest of several researchers due to the aperiodic and low cross-correlated waveforms used for modulation at the transmitter. Because of their wideband nature, they were first used as spreading sequences in traditional spread-spectrum communication systems. Later, these techniques were followed by coherent and noncoherent schemes. Noncoherent schemes unlike coherent schemes do not require chaos synchronization.
Through the years, many methods have been proposed in this category. However, increasing data rates in these schemes posed a challenge. Therefore, multidimensional signaling schemes were proposed. Orthogonal chaotic vector shift keying is one such multidimensional signaling scheme proposed by Wren and Yang. However, the chaotic system which was used to generate signaling basis in their scheme was the Lorenz system. This system forms a weak signaling basis due to the pseudo-repetitive behavior of its chaotic waveforms. Hence, the bit error rate performance of this communication scheme deteriorates in higher dimensions. In this thesis, we design and implement a hybrid hyperchaotic sequence generator for improving the performance of the orthogonal chaotic vector shift keying for higher dimensions. The analysis in this thesis is performed through computer simulations.
|Advisor:||Yeh, Hen-Geul Henry|
|Commitee:||Chassiakos, Anastasios, Kwon, Seok-Chul|
|School:||California State University, Long Beach|
|School Location:||United States -- California|
|Source:||MAI 57/01M(E), Masters Abstracts International|
|Subjects:||Engineering, Electrical engineering|
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