Pulse or digital communications – Spread spectrum – Direct sequence
Reexamination Certificate
2006-03-07
2006-03-07
Fan, Chieh M. (Department: 2638)
Pulse or digital communications
Spread spectrum
Direct sequence
C375S343000, C375S347000, C370S342000
Reexamination Certificate
active
07010023
ABSTRACT:
A path search circuit simultaneously performs antenna directivity control and a path search. A weighting controller controls weighting coefficients to establish an antenna directivity in a plurality of directions in which a party to communicate with is possibly present, when a communication session starts. A weighted-mean-value processor calculates delay profiles for the respective antenna directivities. A correlation peak detector detects a peak from the calculated delay profiles for thereby carrying out general antenna directivity control and a path search. At the time of starting the communication session when the direction of a mobile terminal is unknown, a path search can be conducted using a signal with a Eb/Io increased by an antenna gain for increased path search accuracy.
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Fan Chieh M.
NEC Corporation
Sughrue & Mion, PLLC
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