QAM modulator circuit

Details QAM modulator circuit QAM modulator circuit

1983-10-20

1987-02-24

Olms, Douglas W.

Pulse or digital communications

Repeaters

Testing

H04L 2700

Patent

active

046463267

ABSTRACT:
A method and means for quadrature amplitude modulation is described. The improved QAM modulator circuit utilizes a small read only memory to hold multiple versions of a signal constellation resulting in the elimination of hardware modulator circuits. In addition, the described device can be potentially any modulation scheme on an input signal which is sampled in time by modifying the contents of said ROM.

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patent: 4358853 (1982-11-01), Qureshi
patent: 4382285 (1983-05-01), Sumner et al.
"A MOS/LSI Multiple-Configuration 9600 BPS Data Modem", H. L. Logan, Jr. and G. D. Forney, Jr., IEEE Conference Record, 1976 Int'l Conf. on Communications, vol. III, Jun. 1976.
"A New Hardware Realization of Digital Filters", A. Peled, IEEE Trans. on Acoustics, Speech & Signal Proc., Dec. 1974.
"A 4800 Bit/s Microprocessor Data Modem", K. Watanabe, K. Inoue & Y. Sato, IEEE Trans. on Comm'ns, vol. COM-26, No. 5, May 1978.

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