Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2011-02-01
2011-02-01
Ghebretinsae, Temesghen (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S146000, C375S147000
Reexamination Certificate
active
07881361
ABSTRACT:
A system (10) for communicating a direct sequence spread spectrum signal, a related transmitter (12), a related receiver (14), and methods associated therewith are provided in various embodiments. A data rate vector, a processing gain vector, a frequency separation vector, and a bit energy vector may be associated with transmitting and/or receiving a direct sequence spread spectrum signal. Each vector has a value associated with each of a plurality of channels associated with subcarriers in the direct sequence spread spectrum signal. A value for at least one of the data rate vector, processing gain vector, frequency separation vector, and bit energy vector for at least one channel is different from another value for the corresponding data rate vector, processing gain vector, frequency separation vector, or bit energy vector for another channel. Having one or more vectors with different values provides a spectrally-shaped generalized multitone (or multicarrier) direct sequence spread spectrum (SSG-MT-DS-SS) modulation scheme.
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Calfee Halter & Griswold LLP
Ghebretinsae Temesghen
Ohio University
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