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QPSK modulation and demodulation
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I n digital modulation techniques a set of basis functions are chosen for a particular modulation scheme.Generally the basis functions are orthogonal to each other. Basis functions can be derived using 'Gram Schmidt orthogonalization' procedure.Once the basis function are chosen, any vector in the signal space can be represented as a linear combination of the basis functions.
In Quadrature Phase Shift Keying (QPSK) two sinusoids (sin and cos) are taken as basis functions for modulation. Modulation is achieved by varying thephase of the basis functions depending on the message symbol
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