Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2005-04-19
2005-04-19
Chin, Stephen (Department: 2634)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S308000, C375S213000
Reexamination Certificate
active
06882679
ABSTRACT:
In a direct sequence spread spectrum data communication system an information bit is mixed with a pseudorandom noise or spreading code to produce modulated codeword for transmission. A method of bandwidth efficient M-ary phase shift key modulation encoding at least 16 bits of data to a single codeword is disclosed for extending the data rate of a spread spectrum system. Interoperability with legacy devices is maximized by maintaining structural similarity between the modulated waveforms of the extended data rate and legacy systems.
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Kandala Srinivas
Kowalski John M.
Park Chan K.
Somayazulu V. Srinivasa
Chernoff Vilhauer McClung & Stenzel LLP
Chin Stephen
Sharp Laboratories of America Inc.
Ware Cicely
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