Pulse or digital communications – Spread spectrum – Direct sequence
Patent
1992-09-09
1994-03-08
Kuntz, Curtis
Pulse or digital communications
Spread spectrum
Direct sequence
375 88, 329300, 329303, H04B 110
Patent
active
052934080
ABSTRACT:
A data receiving system comprising an I base-band signal and a Q base-band signal which are used in a quadrature demodulation operation. Zero-crossing points of respective base-band signals are detected and a control signal is generated in response to each zero-crossing point. A phase-shift switching circuit alternately selects either the I base-band signal or the Q base-band signal in response to the control signal to generate an I/Q base-band signal. And, a demodulation operation is executed on the basis of the I/Q signal.
Harada Hiroyuki
Hasegawa Makoto
Imagawa Yasumi
Mimura Masahiro
Namura Yasuaki
Kuntz Curtis
Matsushita Electric - Industrial Co., Ltd.
Webster Bryan E.
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