Index Coded PSK Modulation

Mahesh, Anjana A and Rajan, Sundar B (2016) Index Coded PSK Modulation. In: IEEE Wireless Communications and Networking Conference (WCNC), APR 03-07, 2016, Doha, QATAR.

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Abstract

In this paper, noisy index coding problems over AWGN channel are considered. For a given index coding problem and a chosen scalar linear index code of length N, we proppse to transmit the N index coded bits as a single signal from a 2(N) -PSK constellation. By transmitting the index coded bits in this way, there is an N/2 - fold reduction in the required bandwidth. Also, by transmitting the index coded bits as a PSK signal, receivers with side information satisfying certain conditions get coding gain relative to a receiver with no side information. This coding gain obtained by the receivers is due to proper utilization of their side information and hence is called ``PSK side information coding gain (PSK-SICG)''. We state and prove a necessary and sufficient condition for a receiver to get PSK-SICG. An algorithm to map the index coded bits to PSK signal set such that the PSK-SICG obtained is maximized for the receiver with maximum side information is given. Further, we show that if index coded bits are transmitted as a PSK signal, it is not always necessary to minimize the length of index code used as there are index coding problems where use of a longer index code will give a better performance in terms of probability of error.

Item Type:	Conference Proceedings
Series.:	IEEE Wireless Communications and Networking Conference
Additional Information:	Copy right for this article belongs to the IEEE, 345 E 47TH ST, NEW YORK, NY 10017 USA
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	04 Jan 2017 04:53
Last Modified:	04 Jan 2017 04:53
URI:	http://eprints.iisc.ac.in/id/eprint/55715

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