Spectrum spread transmission method and apparatus
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United States of America Patent
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Mar 14, 2000
Grant Date -
N/A
app pub date -
Mar 18, 1997
filing date -
Mar 19, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Transmission method and apparatus allow two channel simultaneous transmission of information codes having a transmission rate of 1.5 Mbps necessary for the transmission of motion pictures or semi-motion pictures through a 2.4 GHz small power communication band (ISM band). Carrier frequencies f.sub.fa and f.sub.hb of the two channels are set to different values from each other, QPSK modulation is demodulated in a receiver and then inverse-spread of the spectrum spread is conducted, and a low pass filter having a root roll-off characteristic is inserted to a succeeding stage of a spectrum spread circuit of a transmitter and a preceding stage of the spectrum inverse-spread circuit of the receiver.
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