Nesnelerin interneti için sistem tasarımı ve kablosuz kişisel alan ağlarında ağ kodlama uygulamaları

Internet of Things (IoT) is a promising concept to meet the needs of a smarter world in near future. Through the way from development to the deployment of IoT devices, wireless technologies seem to be dominant over wired infrastructures. Plug and play nature of wireless communication makes it more preferable over other alternatives. Almost every IoT device will have at least one radio interface and they will be condensed to the same spatial location. Not only the number of wireless IoT devices increase, but also people move in more crowded multistorey buildings which causes concentration of wireless nodes in same vicinity. Therefore, efficient usage of the radio spectrum will become more important than ever for upcoming decades. As we can easily deduce, efficient usage of the radio spectrum is not only about physical layer protocols but also upper layers that generate payload for the physical layer protocols. For this reason, cross layer approaches gain importance because efficiency is generally provided by multilayer analysis and improvements in telecommunication systems. As a high capacity alternative to conventional routing techniques, network coding provides more efficient usage of radio spectrum for multicast communication between nodes. The main idea behind network coding is processing the received packets in the intermediate nodes instead of simply storing and forwarding within the scope of network layer. With the use of coding techniques, number of transmissions can be reduces for same amount of data transferred through the network. This provides not only efficient usage of radio spectrum for same amount of data but also increases data throughput in unit of time. Within the scope of this study, network coding is applied in a heterogeneous network formed by hybrid radio nodes. Low capability hardware is preferred instead of sophisticated radio nodes, to be able to adapt proposed system to the field easily.