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2 Journal of Telecommunications and Information Technology

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Efficient Performance and Lower Complexity of Error Control Schemes for WPAN Bluetooth Networks

El-Bendary M. A. M., El-Tokhy M. A. R.

Journal of Telecommunications and Information Technology

2014

nr 4

100--107

This paper presents a new technique of reduction retransmission time by decreasing the discarded packets and combating the complexity through error control techniques. The work is based on Bluetooth, one of the most common Wireless Personal Area Network. Its early versions employ an expurgated Hamming code for error correction. In this paper, a new packet format using different error correction coding scheme and new formats for the EDR Bluetooth packets are presented. A study for the Packet Error Probability of classic and Enhanced Data Rate (EDR) packets is also presented to indicate the performance. The simulation experiments are performed over Additive White Gaussian Noise (AWGN) and Rayleigh flat-fading channels. The experimental results reveal that the proposed coding scheme for EDR packets enhances the power efficiency of the Bluetooth system and reduce the losses of EDR packets.

SVD Audio Watermarking: A Tool to Enhance the Security of Image Transmission over ZigBee Networks

El-Bendary M. A. M., El-Azm A. A., El-Fishawy N., Shawki F., El-Tokhy M. A. R., El-Samie F. E. A., Krzemian H. B.

Journal of Telecommunications and Information Technology

2011

nr 4

99-107

The security is important issue in wireless networks. This paper discusses audio watermarking as a tool to improve the security of image communication over the IEEE 802.15.4 ZigBee network. The adopted watermarking method implements the Singular-Value Decomposition (SVD) mathematical technique. This method is based on embedding a chaotic encrypted image in the Singular Values (SVs) of the audio signal after transforming it into a 2-D format. The objective of chaotic encryption is to enhance the level of security and resist different attacks. Experimental results show that the SVD audio watermarking method maintains the high quality of the audio signals and that the watermark extraction and decryption are possible even in the presence of attacks over the ZigBee network.