Low cost DSSS communication system

Details Low cost DSSS communication system Low cost DSSS communication system

2006-01-10

2006-01-10

Ha, Dac V. (Department: 2634)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S145000, C375S146000, C370S514000

Reexamination Certificate

active

06985509

ABSTRACT:
A method and apparatus for direct sequence spread spectrum communication having low complexity. In the transmitter, the data bit is spreaded by a code sequence, a reference code is interleaved with the code sequence, and together they are transmitted by the transmitter. The corresponding receiver recovers the data signal from the received signal by transforming the received signal to a complex base band signal and differentially decoding the base band signal at the chip level. The spreaded signal is despreaded by the chip-level differential operation, thus eliminating the decorrelation operation, and so significantly reducing the cost of the overall system. Furthermore, this system is very robust to any carrier frequency drift since the chip-level differential operation is used, thus releasing the reference clock or crystal requirements, and so further reducing the cost of the system.

REFERENCES:
patent: 5559828 (1996-09-01), Armstrong et al.
patent: 5815526 (1998-09-01), Rice
patent: 6430212 (2002-08-01), Alisobhani et al.
patent: 6728295 (2004-04-01), Nallanathan et al.

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