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

07379509

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.

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Klymyshyn D. M. et al, “FPGA Implementation of Multiplierless M-QAM Modulator”, Electronics Letters, vol. 38, No. 10, May 9, 2002, pp. 461-462.

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