Equipment for generating a transmit signal from first and second digital signals
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United States of America Patent
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-
Dec 31, 1996
Issued Date -
N/A
app pub date -
Jun 5, 1995
filing date -
Oct 30, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A transmitting equipment includes a holding circuit for dividing a time-series digital signal into I and Q digital signals, holding the I and Q digital signals, and outputting them in parallel, a waveform forming circuit, having a memory for storing a plurality of oversampling codes corresponding to the I and Q digital signals, for reading the oversampling codes out of the memory and outputting them as I and Q waveform forming signals, a modulation circuit for orthogonally modulating the I and Q waveform forming signals output from the waveform forming circuit and outputting I and Q modulated signals, an addition circuit for adding the I and Q modulated signals output from the modulation circuit and outputting I and Q sum signals, a filter for removing high-frequency components from the I and Q sum signals output from the addition circuit, and a transmitting signal generation circuit for adding the I and Q sum signals from which the high-frequency components are removed by the filter and generating a transmitting signal.
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