Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2007-08-07
2007-08-07
Ghayour, Mohammed (Department: 2611)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S150000
Reexamination Certificate
active
10366492
ABSTRACT:
A radio receiver handles a transmitted Walsh sequence having a code length of “m” as a two-dimensional array of “a” rows and “b” columns, and performs a fast Hadamard transform process having a code length of “a” in the row direction. The absolute values of the results are added in the column direction, and a Walsh number having the maximum receiving power is selected to determine a Walsh sequence having a code length of “a.” Then, only the identified column is extracted, and a fast Hadamard transform process having a code length of “b” is applied in the column direction.
REFERENCES:
patent: 5442627 (1995-08-01), Viterbi et al.
Kawabe Manabu
Kawamoto Kiyoshi
Mazawa Shiro
Ono Tomoyuki
Ghayour Mohammed
Hitachi Communication Technologies Ltd.
Williams Lawrence
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