A novel ARQ scheme based on Network Coding Theory in Cognitive Radio networks

Abstract

In this paper, Network Coding (NC) Theory is introduced to improve efficiency of the traditional ARQ scheme for Cognitive Radio (CR) broadcast, named as NC-ARQ, in which we consider making the CR basestation combine the lost packets during ARQ broadcast retransmission in CR networks (CRN), with the changeable availability of CR channel. The Broadcast Cost is defined to indicate and compare the theoretic performance between traditional ARQ scheme and NC-ARQ. Numerical results are analyzed to validate the performance improvement of NC-ARQ.