Optimal noncoherent block demodulation of Differential Phase Shift Keying (DPSK)

This work considers Differentially encoded Phase Shift Keying (DPSK) with optimal noncoherent demodulation. It is shown that by performing noncoherent demodulation over an increased observation interval, the performance approaches that of coherently demodulated DPSK. This block demodulation technique of DPSK is a natural generalization of differentially coherent detection and yields improved SNR performance. DPSK with noncoherent block demodulation could be very attractive for harsh channels which are power- and bandwidth-limited, such as in Mobile Digital Cellular systems.