Pulse or digital communications – Systems using alternating or pulsating current
Reexamination Certificate
2005-04-19
2005-04-19
Tran, Khai (Department: 2637)
Pulse or digital communications
Systems using alternating or pulsating current
C380S046000
Reexamination Certificate
active
06882689
ABSTRACT:
A pseudo-chaotic coding/modulation method. The coding method exploits symbolic dynamics of a chaotic map at the transmitter to encode data. The encoding synthesizes the chaotic map based upon the data to be transmitted. In a preferred embodiment, pseudo-chaotic iterates are generated from a digital implementation of a Bernoulli shift map. The output of the shift map is translated by a mapping, preferably implemented by a digital signal processor, to allow transitions between states in a transmitted signal to differ, and the translated map is used to drive a modulator (for example PPM, FSK, PSK, QAM, etc.). In the specific case of pulse-position modulation (PPM) the translated map is used to modulate pulse train positions within a periodic synchronization frame. The preferred embodiment uses a shift register to implement an approximation of the Bernoulli shift map acting as a form of convolutional code with a number of states equal to the symbolic states defined on the chaotic map. A receiver may use fewer states and still decode the data signal, allowing receiver scalability.
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Maggio Gian Mario
Reggiani Luca
Greer Burns & Crain Ltd.
The Regents of the University of California
Tran Khai
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