The block diagram of a QPSK modulator and detector is shown here and
is simply two BPSK systems using quadrature carriers summed in parallel. The source data
is first split into two data streams (often by allocating alternate bits to the upper and
lower modulator), with each data stream running at half the rate of the input data stream.
Conventional root raised cosine filtering would be used
to shape the data pulses in each channel prior to modulation.
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