Communication system having reduced delay time

Pulse or digital communications – Transmitters

Reexamination Certificate

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Details

C375S316000, C375S140000, C375S146000, C375S147000, C375S152000, C380S255000, C380S259000, C380S260000, C380S263000

Reexamination Certificate

active

07822144

ABSTRACT:
A communication system includes a transmitter having a signal generator for generating a signal for transmitting data, a transmission delay unit for repeatedly delaying the signal from the signal generator for a predetermined delay time within a symbol period and generating corresponding delayed signals, and a selector for selectively providing one of the delayed signals from the transmission delay unit to an antenna; and a receiver having a reception delay unit for receiving the signal from the transmitter and delaying the signal as long as the delay time of the transmission delay unit, and a data judgment block for discriminating data bits of the signal from the transmitter by comparing the signal from the transmitter with the delayed signal from the reception delay unit. According to the communication system, the delay time can be accurately adjusted even if the delay line is shortened, and the data bits of the communication signal can be accurately judged in the receiver side.

REFERENCES:
patent: 7593531 (2009-09-01), Lau et al.
Soumyajit Mandel and Soumitro Banerjee, “A chaos-based spread spectrum communication system”, Dec. 28-30, 2003, National conference on nonlinear systems & dynamics, Indian institute of technology, Kharagpur 721302.
Geza Kolumban and Zoltab Jako, “Enhanced versions of DCSK and FM-DCSK data transmission systems”, 1999, IEEE 0-7803-5471-0/99.
Wai M. Tam, Francis C.M. Lau, and Chi K. Tse, “Generalized correlation-delay shift keying scheme for non-coherent chaos-based communication systems”, 2004, IEEE 0-7803-8251-X/04.
Yongxiang Xia, Chi K. Tse, Francis C.M. Lau, “Performance of differential chaos-shift-keying digtial communication systems over a multipath fading channel with delay spread”, 2004, IEEE 1057-7130/04.

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