System for, and method of, transmitting data from a...

Details System for, and method of, transmitting data from a... System for, and method of, transmitting data from a...

2005-10-04

2005-10-04

Burd, Kevin (Department: 2631)

Pulse or digital communications

Spread spectrum

Direct sequence

Reexamination Certificate

active

06952439

ABSTRACT:
Data at a transmitter is modulated, in accordance with instructions from a receiver, to provide M different modulations in successive sequences. N spreading codes are also provided in successive sequences at the transmitter, in accordance with instructions from the receiver, alternately with the M data modulations. The alternate sequences of the M data modulations and the N spreading codes are paired and individual ones of the M data modulations and the N spreading codes in the paired sequences are combined (e.g. multiplied). The paired combinations of the individual ones of the M data modulations and the N spreading codes are transmitted to the receiver, which uses correlation or matched filter techniques to recover each combination of the individual one of the data modulations and the individual one of the spreading codes. A single spreading code may be used instead of the N spreading codes.

REFERENCES:
patent: 5204876 (1993-04-01), Bruckert et al.
patent: 5345469 (1994-09-01), Fulghum
patent: 5748668 (1998-05-01), Tomita et al.
patent: 5781542 (1998-07-01), Tanaka et al.
patent: 6111868 (2000-08-01), Lee et al.
patent: 6160840 (2000-12-01), Park
patent: 6366601 (2002-04-01), Ghosh et al.

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