QAM encoder

Details QAM encoder QAM encoder

1982-11-10

1985-06-25

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 39, 375 67, 328 14, 332 9R, H04L 2720

Patent

active

045258473

ABSTRACT:
This invention describes a QAM encoder which makes use of memory means to generate the desired QAM signals. Each QAM signal corresponds to a group of bits which are defined by an angle on a standard eye-pattern. Each group is passed serially through delay circuits and at the output of each delay circuit there are look-up circuits which select a number from the memory which is a product of the sine of the angle of the group as modified by a sampling signal and a coefficient. These coefficients correspond to the coefficients of the standard transversal digital filter. The numbers generated by each look-up circuit are added to generate the output signals.

REFERENCES:
patent: 4246642 (1981-01-01), Magill
patent: 4346448 (1982-08-01), Insam et al.
patent: 4368433 (1983-01-01), Imazeki et al.
patent: 4435823 (1964-03-01), Davis et al.

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