Quadrature amplitude modulation system using digital filters

Details Quadrature amplitude modulation system using digital filters Quadrature amplitude modulation system using digital filters

1989-05-30

1990-10-23

Grimm, Sigfried H.

Modulators

Phase shift keying modulator or quadrature amplitude modulator

375 39, H04L 2736

Patent

active

049655361

ABSTRACT:
A modulating device applicable to a digital radio communications system which is adaptable to a 16 or greater multi-level QAM modulation system. The device has two multi-input digital filters to implement the role of cosine roll-off filters. A logic circuit precedes the digital filters to logically manipulate n-bit data streams except for m bits (m<n) thereof which should be modulated, in a predetermined manner. The logic circuit is capable of correcting deviations of signal points of a QAM wave or changing the contour of signal constellation to a circular contour or the like, as desired.

REFERENCES:
patent: 4812786 (1989-03-01), Davarian et al.

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