In the present time, there is a rapid increase in demand for faster and reliable transmission of multimedia data through wireless channels. When multimedia data specially an image is to be transferred through the wireless channel, image is highly degraded due to wireless channel errors such as fading, interference and bursty errors. Multi-Carrier Code Division Multiple Access (MC-CDMA) technique is considered as the most promising technique for efficient wireless data transmission. This paper presents the performance comparison of image transmission over MC-CDMA system with two interleaving techniques; Helical interleaving and chaotic interleaving. At the receiver, Linear Minimum Mean Square Error (LMMSE) equalization is employed. System performance is measured through Peak Signal-to-Noise Ratio (PSNR) and Root Mean square Error (RMSE) values. From results, it has been evaluated that MC-CDMA system having chaotic interleaving and LMMSE performs better instead of having helical interleaving for image transmission over wireless channels.
Distributed denial of service attacks are a major threat for wireless sensor network. The aim of these attacks is that genuine users can not use network such as bandwidth, computing power and operating system data structures. Jamming and flooding attacks are one of the most popular attacks on WSN which cause DDoS. There is a requirement for the detection of these attacks rapidly and perfectly. For detection of these attacks, this paper suggests an efficient method. This method provides improved performance over the existing methods. The method is simulated using NS2 simulator. It has been concluded that this efficient method performs better in terms of energy, delay, throughput, packet loss and packet delivery ratio.
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