Code-division multiple-access communication system providing enh

Details Code-division multiple-access communication system providing enh Code-division multiple-access communication system providing enh

1994-06-16

1995-08-15

Gregory, Bernarr E.

Pulse or digital communications

Repeaters

Testing

375206, 380 34, 370 18, 370 19, 370 21, 370 22, H04J 1302, H04J 1304, H04B 1707

Patent

active

054426626

ABSTRACT:
A code-division multiple-access spread-spectrum communication system uses pairs of spreading codes with rates of N/2 chips per data symbol to provide a capacity equivalent to that obtained in a conventional system with N chips per symbol. In the transmitter, identical input data are spread in parallel by both spreading codes, then used to modulate two orthogonal carrier signals, and the resulting radio-frequency signals are combined for transmission from an antenna. In the receiver, the received signal is demodulated by parallel multiplication with the two carrier signals, the resulting baseband signals are correlated with the two spreading codes, and the results are added.

REFERENCES:
patent: 3124748 (1964-03-01), Webb, Jr.
patent: 4759034 (1988-07-01), Nagazumi
patent: 5103459 (1992-04-01), Gilhousen et al.
patent: 5166951 (1992-11-01), Schilling
patent: 5309474 (1994-05-01), Gilhousen et al.
patent: 5319672 (1994-06-01), Sumiya et al.
Sklar, B, Digital Communications, Prentice Hall, 1988, pp. 571-573.

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