Hybrid Network Coding and Cooperative Relaying Schemes for Bi-Directional Communication Systems

Abstract

With the purpose of improving the performance of?@next generation wireless networks, cooperative relaying (CoR)?@and network coding (NC) are promising techniques for bidirectional?@or two-way transmissions. Compared to CoR, NC can?@reduce the number of bi-directional transmission slots, which result?@in higher total throughput. However, the asymmetric traffic?@condition has significant impact on the bi-directional throughput?@of NC. CoR is robust against asymmetric traffic conditions?@when adaptive transmission direction switching (TDS) based on?@channel and traffic condition is applied. In order to improve?@the throughput of NC even under asymmetric traffic condition,?@two hybrid NC and CoR schemes with opportunistic scheduling?@are proposed in the present paper. In the proposed schemes,?@adaptive resource allocation is realized for each transmission?@protocol, and the impact of the traffic ratio and the relay position?@on the throughput is investigated. Simulation results reveal that?@the proposed schemes not only achieve higher throughput than?@the conventional scheme but are also robust against asymmetric?@traffic conditions. Moreover, the results can contribute to the?@development of relay selection and routing schemes for practical?@networks.