Abstract
Differential modulation techniques are being employed in future access networks. Differential Amplitude Phase Shift Keying (DAPSK) is a differential modulation technique that combines the features of Differential Phase Shift Keying (DPSK) and Quadrature Amplitude Modulation (QAM). The basic fundamentals and the system design considerations of DAPSK are discussed. A detailed analysis of the QAM and DAPSK modulation techniques carried out reveals that DAPSK is spectrally efficient and hence more suitable for the access network.
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