Network Coding Strategies and Performance Evaluation for Bidirectional Relaying

Abstract: The ambitious of researchers to reach the maximum capacity of data network lead them to network coding. The simplicity of applying network coding and the improvement to achieve the maximum possible information flow in a network lead to apply network coding in many applications. Network coding was implemented first in wired medium, and then moved to the wireless one. Due to the special characteristics of the wireless medium and the less reliability compared with the wired one, this created wide research area of network coding applications for wireless systems. In this work, the main focus will be on practical implementation problem when network coding is applied in a two way relay networks. A new proposed method of performing network coding will be presented. Our proposed method can achieve better network performance than conventional network coding. We will also provide our own method to generate the coded message. The main feature of the proposed method is to multiply the received packets together inside the relay node. The packets multiplication is at the symbol level in the complex domain. The resulted packet will be broadcasted to both receivers. The receivers will be able to recover the other node packet by dividing the broadcasted packet with their own packets. Analytical and experimental analysis show that the proposed method has better performance and more robust for channel asymmetry than conventional network coding.