iosr-JECE   Volume-2 ~ Issue-4

Abstract: Wireless sensor network is a special kind of network that differs from the conventional communication networks in terms of architecture and deployment. Dynamic in nature, the wireless sensor networks have added a new dimension not only to the further exploration in a hard-to-reach environment, but also to the complexity of network management. Wireless sensor networks are emerging very rapidly and have already demanded keen interests from researchers. As a relatively new concept in the world of communication, a number of aspects are being explored by the researchers including routing and security features of the wireless sensor networks. Like any wireless network, power consumption has always been a critical issue for wireless sensor networks. This is also due to the environmental constraint in which the wireless sensor networks are normally deployed. This paper provides an overview of this emerging technology by addressing its architecture, deployment and key issues e. g. energy-efficiency, routing, reliability and security
Key words: wireless sensor network, reliability, routing, security, sensor

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Abstract: The importance of key management protocol in ensuring secure communications in WSN is undeniable. This paper presents an IBE-Trust security framework utilizing the well-known identity based encryption scheme not to only establish secure communications but to ensure the trustworthiness of the communication between sensor nodes and base station. The framework incorporates ideas from Trusted Computing Group (TCG) and the Identity based cryptosystem developed by Boneh Franklin in ensuring trusted and secure communications between sender and receiver. The framework and proposed implementation procedures are briefly discussed. The proposed framework which was developed on TinyOS platform was simulated using TOSSIM on Micaz nodes and a study was carried out to compare memory utilizations of the proposed security framework with those obtained in a recent similar work.

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Abstract: As the quantity of data transmission and reception increases, there is a gradual increase in bandwidth on demand and quality of service. This further increases data traffic which leads to loss of information, reduced accuracy and reliability. To overcome this drawback, we proposed coprocessor can be used for communication operations, such as scrambling, interleaving, convolutional encoding, viterbi decoding, FFT, and several other functions using the proposed design. The coprocessor has been modeled by VHDL. Performance comparisons shows that the number of clock cycles can be reduced about 48% for scrambling and 84% for convolutional encoding compared with existing DSPs. From the results, performance of proposed coprocessor is better than conventional DSP (SC140) in terms of number of clock per cycle and gate counts.
Keywords: scrambling, convolutional encoding, interleaving, modulation, viterbi decoding, FFT.

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