Pulse or digital communications – Receivers – Interference or noise reduction
Reexamination Certificate
2005-06-14
2005-06-14
Ghebretinsae, Temesghen (Department: 2637)
Pulse or digital communications
Receivers
Interference or noise reduction
C375S267000, C375S148000, C375S144000, C455S135000, C455S277200
Reexamination Certificate
active
06907094
ABSTRACT:
The present invention provides a diversity receiving device with superior interference resistance in a simple construction, comprising a plurality of antennas (11, 12); an antenna switching device (13) that selects any one of a plurality of antennas (11, 12) and carries out connection switching thereof; a demodulator (14) that demodulates a wireless signal and obtains a baseband spread spectrum signal; an A/D converter (15) that A/D converts the baseband spread spectrum signal and generates chip data; a digital matched filter (16) that finds the correlation value of the chip data and the spreading code; a maximum correlation value detection portion (18) that detects the maximum correlation value; an average value calculation portion (21) that finds the average value per frame of the maximum correlation value; and a level comparison device (22) that compares the above-mentioned average value and a predetermined threshold value, and outputs a control signal to the antenna switching device (13) to control antenna switching in the antenna switching device (13).
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Fujikura Toshiaki
Horibe Akio
Ito Muneki
Matsui Masaki
Sato Shigeo
Ghebretinsae Temesghen
Uniden Corporation
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