Pulse or digital communications – Spread spectrum – Time hopping
Reexamination Certificate
2004-03-08
2009-02-24
Torres, Juan A. (Department: 2611)
Pulse or digital communications
Spread spectrum
Time hopping
C375S140000
Reexamination Certificate
active
07496128
ABSTRACT:
Techniques are described for maintaining the orthogonality of waveforms transmitted in ultra wideband (UWB) multi-user wireless communication systems. The multi-stage block-spreading (MS-BS) techniques described herein deterministically eliminate multiple user interference (MUI) in the presence of frequency-selective fading channels. A transmitter includes a block-spreading unit to generate a stream of frames from a block of information bearing symbols by applying an orthogonal set of spreading codes, such as direct sequence cod& division multiple access (CDMA) codes or digital carrier frequency multiple access codes, such that the frames corresponding to different blocks of the symbols are interleaved. The transmitter further includes a time-hopping spreading unit to generate a stream of chips from the stream of frames by applying an orthogonal set of time-hopping (TH) spreading codes such that chips corresponding to different frames are interleaved.
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M.L.
Giannakis Georgios B.
Yang Liuqing
Regents of the University of Minnesota
Shumaker & Sieffert P.A.
Torres Juan A.
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