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Title: Reliable communication in embedded systems
Author: Ghamari, Mohammad
Awarding Body: Lancaster University
Current Institution: Lancaster University
Date of Award: 2013
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Embedded computer systems equipped with wireless communication transceivers are nowadays used in a vast number of application scenarios. Energy consumption is important in many of these scenarios as systems are battery operated and long maintenance free operation is required. To achieve this goal, embedded systems employ low-power communication transceivers and protocols. However, currently used protocols cannot operate efficiently when communication channels are highly erroneous. In many application scenarios, we find this characteristic that a large numbers of transmitted packets maybe lost or received corrupted. This work aims to provide solutions to this particular problem. This thesis focuses on one particular class of low-power MAC protocols in embedded systems and investigates its transmission reliability through erroneous channels. Subsequently, this thesis presents a number of techniques which ameliorate the transmission reliability in conjunction with energy efficiency of existing low-power MAC protocols simultaneously in erroneous channels. In this thesis, average diversity combining (ADC) is applied in low-power MAC protocols to ensure that the received corrupted packets can be used to contribute in decoding process. This thesis demonstrates that how ADC is integrated with low-power MAC protocols. It is also shown that the integrated method improves low-power Communication dramatically. The integrated method always reduces the frame error rate; in some investigated scenarios frame error rates are reduced from 20.85% to 1.25%. Furthermore we have shown that the ADC mechanism can be implemented on existing systems without significant impact on system performance. In addition, transmit/receive diversity along with error correction technique is also applied in existing low-power MAC protocols such that high losses of transmitted packets are preventable. This work demonstrates how transmit/receive diversity along with error correction technique is integrated with low-power MAC protocols. It is illustrated that the integrated scheme prevents high losses of transmitted packets. Subsequently, in order to further analyze the transmission reliability cost of the proposed techniques in low-power embedded systems, we have compared different combinations of proposed hardware and software extensions. Surprisingly, our analysis is demonstrated that, although increasing the number of antennas at one particular side of a communication link which is directly proportional to the system cost, always guarantee better transmission reliability, however, there are cases that applying fewer number of antennas along with using appropriate software extensions can provide better transmission reliability compared with cases with more number of antennas.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available