Spread-spectrum receiver with fast M-sequence transform

Details Spread-spectrum receiver with fast M-sequence transform Spread-spectrum receiver with fast M-sequence transform

2007-03-03

2008-10-07

Phu, Phuong (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S147000, C375S142000, C375S149000, C370S342000, C370S320000, C370S335000

Reexamination Certificate

active

07433391

ABSTRACT:
A receiving system dynamically searches a communications band for transmissions of messages having the same nominal communications parameters, including the use of the same spreading code, but having potentially different specific frequencies and code-phases. The receiver samples the communications band at each code-phase of the spreading code over a span of down-converted transmission frequencies. When a message element is detected at a particular code-phase and frequency, it is forwarded to a demodulator that demodulates the message and sends it to its intended destination. This technique allows each transmitter to be independent of the receiver. In a preferred embodiment of this invention, a Fast M-Sequence Transform (a Walsh-Hadamard Transform) is used to determine the power level at multiple code-phases at a given frequency in parallel, thereby substantially reducing the time required to search for transmissions at each discrete code-phase.

REFERENCES:
patent: 4876737 (1989-10-01), Woodworth et al.
patent: 4901307 (1990-02-01), Gilhousen et al.
patent: 5109390 (1992-04-01), Gilhousen et al.
patent: 5490165 (1996-02-01), Blakeney et al.
patent: 5537397 (1996-07-01), Abramson
patent: 5566168 (1996-10-01), Dent
patent: 5668556 (1997-09-01), Rouffet et al.
patent: 5697050 (1997-12-01), Wiedeman
patent: 5758260 (1998-05-01), Wiedeman
patent: 5790070 (1998-08-01), Natarajan et al.
patent: 6052561 (2000-04-01), Rudowicz et al.
patent: 6128469 (2000-10-01), Zenick et al.
patent: 6151313 (2000-11-01), Abramson
patent: 6185245 (2001-02-01), Kim
patent: 6188682 (2001-02-01), Takagi et al.
patent: 6205167 (2001-03-01), Kamgar et al.
patent: 6307840 (2001-10-01), Wheatley et al.
patent: 6317029 (2001-11-01), Fleeter
patent: 6339611 (2002-01-01), Antonio et al.
patent: 6373831 (2002-04-01), Secord et al.
patent: 6396819 (2002-05-01), Fleeter et al.
patent: 6421373 (2002-07-01), Saito
patent: 6510172 (2003-01-01), Miller
patent: 6549559 (2003-04-01), Kamgar et al.
patent: 6574205 (2003-06-01), Sato
patent: 6639906 (2003-10-01), Levin
patent: 6754190 (2004-06-01), Gurney et al.
patent: 6894995 (2005-05-01), Chitrapu et al.
patent: 6944149 (2005-09-01), Kim et al.
patent: 6985512 (2006-01-01), McDermott et al.

Affiliated with

Also associated with

Rating

Spread-spectrum receiver with fast M-sequence transform does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Spread-spectrum receiver with fast M-sequence transform, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Spread-spectrum receiver with fast M-sequence transform will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4018760