Digital intermediate frequency QAM modulator using parallel...

Details Digital intermediate frequency QAM modulator using parallel... Digital intermediate frequency QAM modulator using parallel...

2008-05-27

2008-05-27

Fan, Chieh M. (Department: 2611)

Pulse or digital communications

Transmitters

Quadrature amplitude modulation

C375S261000, C332S103000

Reexamination Certificate

active

10644561

ABSTRACT:
The digital Intermediate Frequency (IF) modulator applies to various modulation types and offers a simple and low cost method to implement a high-speed digital IF modulator using field programmable gate arrays (FPGAs). The architecture eliminates multipliers and sequential processing by storing the pre-computed modulated cosine and sine carriers in ROM look-up-tables (LUTs). The high-speed input data stream is parallel processed using the corresponding LUTs, which reduces the main processing speed, allowing the use of low cost FPGAs.

REFERENCES:
patent: 4534040 (1985-08-01), Thapar
patent: 5123031 (1992-06-01), Kuisma
patent: 5453720 (1995-09-01), McCullough et al.
patent: 5612651 (1997-03-01), Chethik
patent: 5745527 (1998-04-01), Kelton et al.
patent: 5815531 (1998-09-01), Dent
patent: 5838727 (1998-11-01), Lyon et al.
patent: 5838728 (1998-11-01), Alamouti et al.
patent: 5907264 (1999-05-01), Feldman
patent: 6141387 (2000-10-01), Zhang
patent: 6175599 (2001-01-01), Lyon et al.
patent: 6430228 (2002-08-01), Zhang
patent: 6628727 (2003-09-01), Wu et al.
patent: 6674811 (2004-01-01), Desrosiers et al.
patent: 6763072 (2004-07-01), Matsui et al.
patent: 2003/0081693 (2003-05-01), Raghavan et al.
patent: 2003/0156659 (2003-08-01), Hanaoka et al.
patent: 2003/0179830 (2003-09-01), Eidson et al.
patent: 2004/0091060 (2004-05-01), Becker
patent: WO 00/65799 (2000-11-01), None
Klymyshyn D. M. et al, “FPGA Implementation of Multiplierless M-QAM Modulator”, Electronics Letters, vol. 38, No. 10, May 9, 2002, pp. 461-462.

Affiliated with

Also associated with

Rating

Digital intermediate frequency QAM modulator using parallel... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Digital intermediate frequency QAM modulator using parallel..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Digital intermediate frequency QAM modulator using parallel... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3917280