Spread spectrum digital transmission system using low-frequency pseudorandom encoding of the wanted information and spectrum spreading and compression method used in a system of this kind
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United States of America Patent
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Aug 13, 1996
Grant Date -
N/A
app pub date -
Jun 8, 1994
filing date -
Jun 9, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A spread spectrum digital transmission system using low-frequency pseudorandom encoding of desired information, and a spectrum spreading and compression method used in such a system. In a transmitter in the system, each block of a digital signal to be transmitted is combined with a sample obtained from a low-frequency pseudorandom generator. The resulting various combinations are converted into orthogonal or quasi-orthogonal sequences which are modulated and transmitted to a receiver. The receiver demodulates the signal received and combines each sequence with a sample identical to that used for the low-frequency coding at the transmitter to recover the various blocks of the transmitted signal. Hence, low frequency spectrum spreading of a signal to be transmitted is achieved.
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