Noisy index coding problem over a single-input single-output additive white Gaussian noise (AWGN) broadcast channel has been studied in [4]–[6]. For a given index coding problem with an order of priority among the receivers and a chosen index code of length N results have been reported only for symmetric PSK modulation. In this work we improve the performance of high priority receivers by transmitting the N bits using a rotated M-PSK $(M=2^{N}$) constellation where half the number of points are rotated by an angle $\theta$, where $0\leq\theta\lt 2\pi/M$. The results in [4]–[6] correspond to the case $\theta=0$. We show that the probability of error performance for the high priority receivers improve as $\theta$ increases and simultaneously that of the low priority receivers deteriorate. As a result the performance of some of the receivers in the middle of the priority order may remain unchanged.
Index Coded PSK Modulation with Rotated Constellation for Prioritized Receivers
2022-06-01
644110 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
The effect of constellation density on trellis coded modulation in fading channels
Kraftfahrwesen | 1992
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