Systems and methods for providing adaptive pulse position...

Details Systems and methods for providing adaptive pulse position... Systems and methods for providing adaptive pulse position...

2007-03-06

2007-03-06

Burd, Kevin (Department: 2611)

Pulse or digital communications

Pulse code modulation

C375S146000, C375S147000

Reexamination Certificate

active

10252351

ABSTRACT:
An adaptive pulse position modulated CDMA scheme for use in UWB communications systems is disclosed. A stream of input bits is encoded with spreading code sequence. The spreading code sequence consists of a number of code elements that may have one of two values. Each bit is encoded into a symbol consisting of a predefined number of chips, which are transmitted during a symbol period. Next, at least one code element is associated with each chip in the symbol. Then, an encoded pulse is generated in each chip. Each encoded pulse has a value determined by multiplying the data bit with the code value associated with the particular chip. The encoded pulse is then pulse position modulated by shifting the position of the pulse to a first position or a second position within the chip depending upon the encoded value of the pulse.

REFERENCES:
patent: 5610907 (1997-03-01), Barrett
patent: 5677927 (1997-10-01), Fullerton et al.
patent: 6717992 (2004-04-01), Cowie et al.
patent: 6959032 (2005-10-01), Richards et al.

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