Quadrature amplitude modulation system using digital filters
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United States of America Patent
Stats
-
Oct 23, 1990
Grant Date -
N/A
app pub date -
May 30, 1989
filing date -
May 28, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
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
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