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Just as in an ordinary QPSK modulator, the output of a

Just as in an ordinary QPSK modulator, the output of a

Just as in an ordinary QPSK modulator, the output of a p/4-shifted DQPSK modulator may be expressed in terms of its in–phase and quadrature components as follows; s(t) = s1(t) cos(2pfct) – sQ(t) sin (2pfct) formulate the in-phase component s1(t) and quadrature component sQ(t) of the p/4-shifted DQPSK signal. Hence, outline a scheme for the generation of p/4-shifted DQPSK signals.

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