Wireless sensor networks (WSNs) are gaining popularity in different areas of applications like industrial monitoring, military applications, home automation, smart grid applications, body organ monitoring, etc. A WSN is a wireless network comprising of a number of devices, called sensor nodes. A sensor node, usually battery powered, is capable of detecting physical phenomena, such as light, temperature, movement, noise, pressure, humidity, etc. Medium access control (MAC) protocols are in a key role for determining the energy efficiency of a WSN, which is a key design issue for battery operated sensor nodes. Alongside energy efficiency, reliable transmission is also always preferred in communication networks. The IEEE 802.15.4 standard provides low power solutions to the WSN applications by specifying physical and MAC layer functions for low rate wireless personal area networks.
In this thesis, Markov chain models are derived to study the throughput and the energy consumption of IEEE 802.15.4 MAC taking into account the packet corruption by both collisions and channel errors. An increase in reliability reduces retransmissions of erroneous packets, which in turn reduces the energy consumption. Therefore, a network with low energy consumption and high reliability is always desired. Wireless radio channel is the medium used for the transmissions in WSNs and it is error prone leading to received data corruption. To mitigate this influence of channel to some extent, forward error correction (FEC) may be employed. FEC provides error correction with the addition of redundant bits to the original message. Various FEC codes are analysed to study the influence of coding on the performance of the IEEE 802.15.4 type networks. Along with the FEC, influence of data frame payload size on performance is also studied. Numerical analyses are carried out and illustrated using Matlab. The results show that the performance of an IEEE 802.15.4 type network can be improved using an appropriate choice of payload size and FEC.
| Identifer | oai:union.ndltd.org:oulo.fi/oai:oulu.fi:nbnfioulu-201512052255 |
| Date | 09 December 2015 |
| Creators | Ghimire, L. (Lalit) |
| Publisher | University of Oulu |
| Source Sets | University of Oulu |
| Language | English |
| Detected Language | English |
| Type | info:eu-repo/semantics/masterThesis, info:eu-repo/semantics/publishedVersion |
| Format | application/pdf |
| Rights | info:eu-repo/semantics/openAccess, © Lalit Ghimire, 2015 |
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