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Let ∆θk denote the differentially encoded phase in th

Let ∆θk denote the differentially encoded phase in th

Let ??k denote the differentially encoded phase in the p/4-shifted DQPSK. The symbol pairs (I, Q) generated by this scheme may be defined as where Ik and Qk are the in-phase and quadrature components corresponding to the kth symbol show that this pair of relations can be expressed simply as Ik = cos ?k Qk = sin ?k where ?k is the absolute phase angle for the kth symbol.

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