Components of the Radio Frequency Subsystem
The RF subsystem consists of the in-phase and quadrature (IQ) modulator, power amplifier (PA), baseband converter, and spectral filter subsystems. The operations of the RF subsystem, proceeding from left to right in Figure 5.1, are the following. The IQ modulator takes the input data stream and split it into two separate data stream. One data stream Xl multiplies a sinusoidal waveform; the other data stream XQ, a cosinusoidal waveform. These two waveforms are summed together to form a modulated intermediate frequency (IF) carrier. The envelope of the IF carrier, A, is given by
Equation 5.1
Figure 5.1. ...
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