Shui Yu’s research while affiliated with Deakin University and other places

Ever since the wireless relay network (RN) was introduced, it has led to the discovery of several new protocols, which have been consistently improved by researchers to overcome many constraints such as throughput, capacity bound, symbol error rate, outage probability, and power allocations. Meanwhile, network coding (NC) was invented as an efficient technique to address these problems. To the best of our knowledge, there has been no comprehensive discussion about wireless-RN modes in the literature. We therefore provide a tutorial concerning the basic concepts of NC, dealing with the classification of particular relay modes, and presenting new wireless-RN protocols with/without NC in this paper. Under appropriate categories (i.e., fixed and dynamic), much attention has been given to various proposed wireless-RN protocols because they may differ individually depending on their processing at relay nodes and network topology. We compare the available wireless-RN protocols with/without NC, and conclude that the wireless-RN based on NC outperforms the traditional wireless-RN in certain scenarios.

In recent times, there have been many advances in the field of information theory and wireless ad hoc network technologies. Regarding information theory progression and its connection with wireless ad hoc networks, this study presents fundamental concepts related to the application of the state-of-the-art Network Coding (NC) within wireless ad hoc networks in the context of routing. To begin with, this paper briefly describes opportunistic routing and identifies differentiation between NC-aware and NC-based routing mechanisms in wireless ad hoc networks. However, our main focus is to provide a survey of available NC-aware routing protocols that make forwarding decisions based on the information of available coding opportunities across several routes within wireless ad hoc networks. The taxonomy and characteristics of various representative NC-aware routing protocols will also be discussed. In summary, we provide a comparison of available NC-aware routing schemes and conclude that NC-aware routing techniques have several advantages over traditional routing in terms of high throughput, high reliability, and lower delay in a wireless scenario. To the best of our knowledge, this work is the first that provides comprehensive discussion about NC-aware routing protocols.

Network coding is a promising technology to improve the throughput and reliability of networks. One critical factor that contributes to a distinct advantage of network coding in a dynamic network circumstance is the existence of a perfect feedback scheme. The current feedback schemes for network coding require special conditions to operate. However, the conditions are extremely hard to meet in practice. In this paper, we propose a novel and effective feedback scheme, orthogonal coded feedback (OCF), in order to avoid the defects of the existing feedback schemes for network coding. Based on our knowledge, this is the first attempt to incorporate orthogonal coding over a finite field into network coding for addressing problems of feedback in network coding diagrams. We establish a simple mathematical model for the feedback scheme, and a thorough analysis has been conducted based on the proposed model. Moreover, we design a simple code generating algorithm for orthogonal coding that can be used in any finite field. Our extensive simulations indicate that the proposed OCF outperforms the current feedback schemes in various network topologies.