Low Complexity Decoding and Capacity of Index Coding Problems with Symmetric Side-Information

Vaddi, Mahesh Babu and Rajan, B Sundar (2019) Low Complexity Decoding and Capacity of Index Coding Problems with Symmetric Side-Information. In: 2018 IEEE Information Theory Workshop, ITW 2018, 25-29 Nov., 2018, Sun Yat-Sen Kaifeng HotelGuangzhou; China, pp. 150-154.

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Abstract

A single unicast index coding problem (SUICP) with symmetric side-information has K messages and K receivers, the kth receiver R-k wants x(k), R-k has some subset of messages as side-information and the side-information is symmetric to its wanted message x(k). Maleki, Cadambe and Jafar studied various symmetric index coding problems because of their importance in topological interference management problems. In our previous work, we constructed binary matrices of size `in x n. for any given arbitrary positive integers m. and n. such that any n, adjacent rows of this matrix are linearly independent. We refer these matrices as Adjacent Independent Row (AIR) matrices. We designed optimal and near-optimal vector linear index codes for various symmetric SUICPs by using AIR matrices. To design the optimal and near -ptimal vector linear index codes, we convert the respective symmetric SUICP into an SUICP with symmetric neighboring and consecutive (SNC) side-information. Then, we use AIR matrix to encode the STACY with SNC side-information. Hence, low-complexity decoding of SUICP with SNC side-information is important for efficient decoding of optimal and near-optimal index codes for various symmetric SUICPs. We analyse some of the combinatorial properties of AIR matrices in this work. By using these properties, we provide a low-complexity decoding for SUICP with SNC side-information. The low-complexity decoding explicitly identifies the set of broadcast symbols required at every receiver to decode its wanted message. By using low complexity decoding, we find the capacity of SUICP with symmetric side-information K-k = {Xk+g,Xk+2g,..x(k+)t(g)}, where g = gcd(K, D) and t = D/g for any positive integer D < K.

Item Type:	Conference Paper
Series.:	Information Theory Workshop
Publisher:	IEEE
Additional Information:	IEEE Information Theory Workshop (ITW), Guangzhou, PEOPLES R CHINA, NOV 25-29, 2018
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	03 Jul 2019 07:26
Last Modified:	03 Jul 2019 07:26
URI:	http://eprints.iisc.ac.in/id/eprint/62824

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