RT-Polar: An HARQ Scheme with Universally Competitive Rates

Banerjee, Soumya Subhra and Tyagi, Himanshu (2019) RT-Polar: An HARQ Scheme with Universally Competitive Rates. In: 2018 IEEE Information Theory Workshop, ITW 2018, 25-29 Nov.,2018, Sun Yat-Sen Kaifeng HotelGuangzhou; China, pp. 6-10.

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Abstract

We present a construction for a universal channel code with feedback using Polar Codes. Our construction includes an error detection mechanism that is used to compute the ACK/NACK feedback directly from the received vector, without a higher layer CRC. Our scheme, termed the Repeat-Top Polar Code (RT-Polar), builds on a rate-compatible Polar Code and retransmits the t message bits sent over the most reliable polarized good channels over the least reliable good channels. At the decoder, these two t-bit strings are decoded and compared to detect an error. Through simulations, we illustrate the universal performance of our scheme for a binary symmetric channel with an unknown flipover probability. Our scheme performs comparably with a genie-aided scheme, where the detection mechanism is assumed to be error-free, for practically relevant message lengths of roughly 512 bits; this is the first instance of such a universal performance reported in literature. The proposed scheme is suitable for use as a HARQ in low-latency communication where including a higher-layer CRC will induce computational delays.

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:	26 Jun 2019 15:26
Last Modified:	26 Jun 2019 15:26
URI:	http://eprints.iisc.ac.in/id/eprint/62823

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