Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2006-04-18
2006-04-18
Chin, Stephen (Department: 2634)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S140000, C375S147000
Reexamination Certificate
active
07031375
ABSTRACT:
Ternary spreading codes in which side lobes near a peak of auth-correlation and cross-correlation are zero for a duration equal to or less than (0.75N+1) chips for a N chip period code are generated. The ternary spreading codes of the present invention is generated by (a) generating ternary zero correlation duration preferred pair codes, in which the zero correlation duration of (0.75N+1) chips is retained, by expanding a N chip period of a code, N being a natural number; and (b) generating a plurality of ternary zero correlation duration code sets having zero correlation characteristic equal to or less than (0.75N+1) chips by shifting the generated ternary zero correlation duration preferred pair codes in chips.
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Chin Stephen
Electronics and Telecommunications Research Institute
File Erin M.
Mayer Brown Rowe & Maw LLP
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