Spread spectrum digital transmission system using low-frequency

Details Spread spectrum digital transmission system using low-frequency Spread spectrum digital transmission system using low-frequency

1994-06-08

1996-08-13

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

H04B 1500

Patent

active

055464238

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.

REFERENCES:
patent: 4685132 (1987-08-01), Bishop et al.
patent: 4972474 (1990-11-01), Sabin
patent: 5153598 (1992-10-01), Alves, Jr.
patent: 5276705 (1994-01-01), Higgins
patent: 5341396 (1994-08-01), Higgins et al.
patent: 5377226 (1994-12-01), Davis

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