Abstract
An alternative to the use of higher order Quadrature Amplitude Modulation (QAM) that shows strong variations of output amplitude is the use of higher order Phase Shift Keying (PSK). The bit error probability of higher order PSK is sensitive to phase distortion that is caused by propagation delay and Doppler frequency estimation errors. Phase Updating Loop (PUL) is a generalization of a Phase Locked Loop (PLL) that can estimate the delay and the Doppler accurately. In order to realize a higher order PSK, we recently proposed a delay-Doppler Space Division Multiplexing (dD-SDM) method in which a parameter space consisting of delay and Doppler is partitioned into several sub-spaces and each subspace has its assigned signature codes. In this paper, digital PUL is defined. Simulation results show that by the use of the dD-SDM method together with digital PUL we can successfully demodulate 256PSK data.
This research is supported by the Aihara Project, the FIRST program from JSPS, initiated by CSTP and JSPS KAKENHI Grant Number 25820162.
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Jitsumatsu, Y., Kohda, T. (2014). Digital Phase Updating Loop and Delay-Doppler Space Division Multiplexing for Higher Order MPSK. In: Jonsson, M., Vinel, A., Bellalta, B., Belyaev, E. (eds) Multiple Access Communications. MACOM 2014. Lecture Notes in Computer Science, vol 8715. Springer, Cham. https://doi.org/10.1007/978-3-319-10262-7_1
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DOI: https://doi.org/10.1007/978-3-319-10262-7_1
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