Method and apparatus for generating multiple matched-filter PN v

Details Method and apparatus for generating multiple matched-filter PN v Method and apparatus for generating multiple matched-filter PN v

1998-10-14

2000-10-31

Chin, Stephen

Pulse or digital communications

Spread spectrum

Direct sequence

375150, 331 78, 708250, H04L 2730

Patent

active

061413747

ABSTRACT:
A vector generator generates one or more pseudo-random noise PN sequences as matched-filter PN vectors for a matched-filter correlator of a code division, multiple-access (CDMA) demodulator. The period and clock of the local PN code sequence may be employed as a time reference, and each matched-filter PN vector has a known code-phase offset with respect to the local PN code sequence. Matched-filter PN vectors having a chip-length on the order of a data symbol period, such as 64-chip sequences, are generated within a short period of time compared to the period of the local PN code sequence. A state of the local PN code sequence is periodically captured from the local PN code sequence, which state is employed by a PN generator generating a similar PN code sequence but clocked at a higher rate. Consequently, a series of offset PN code sequences are generated in advance of the local PN code sequence. Combined with single or parallel offset masking, any desired matched-filter PN vector may be generated from the offset PN code sequences within a short period when compared to the period of the local PN code sequence. The generation time of each matched-filter PN vector may be 1-chip period in duration. A vector correlator of a RAKE receiver may employ the vector generator in a CDMA communication system. Consequently, the vector generator provides the vector correlator with matched-filter PN vectors for a matched-filter, multiple-finger search. The vector generator allows for time-multiplexed generation of the matched-filter PN vectors.

REFERENCES:
patent: 3728529 (1973-04-01), Kartchner et al.
patent: 3947634 (1976-03-01), Betts
patent: 4707839 (1987-11-01), Andren et al.
patent: 5237586 (1993-08-01), Bottomley
patent: 5239587 (1993-08-01), Schoolcraft
patent: 5243622 (1993-09-01), Lux et al.
patent: 5305349 (1994-04-01), Dent
patent: 5327455 (1994-07-01), De Gaudenzi et al.
patent: 5361276 (1994-11-01), Subramanian
patent: 5442627 (1995-08-01), Viterbi et al.
patent: 5442661 (1995-08-01), Falconer
patent: 5448600 (1995-09-01), Lucas
patent: 5519736 (1996-05-01), Ishida
patent: 5640416 (1997-06-01), Chalmers
patent: 5740088 (1998-04-01), Nakagawa et al.
patent: 5745529 (1998-04-01), Hikoso et al.
patent: 5926070 (1999-07-01), Barron et al.

Affiliated with

Also associated with

Rating

Method and apparatus for generating multiple matched-filter PN v does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for generating multiple matched-filter PN v, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for generating multiple matched-filter PN v will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2062039