M-ary modulation of signals for coherent and differentially...

Pulse or digital communications – Transmitters

Reexamination Certificate

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C375S138000, C375S308000, C375S146000, C375S133000

Reexamination Certificate

active

07388927

ABSTRACT:
A system incorporates time-hopped impulse-radio (TH-IR), transmitted-reference impulse-radio (TR-IR) and noncoherent transceivers in the same wireless network. A transmitter modulates a sequence of bits in a wireless communications network by selecting one coding sequence from a set of orthogonal or quasi-orthogonal coding sequences based on a current subsequence of bits of the input sequence, generating a reference waveform and a data waveform of a waveform pair for each sequence.

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patent: 2004/0190641 (2004-09-01), Ojard
patent: 2005/0271120 (2005-12-01), Hoctor
Nakache “Spectral shape of UWB signals—influence of modulation format, multiple access scheme and pulse shape”, The 57th IEEE Semiannual Vehicular Technology Conference, 2003. VTC 2003-Spring. vol. 4, Apr. 22-25, 2003 pp. 2510-2514 vol. 4.

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