For a single transmit and receive antenna system, a new constellation design is proposed to combat errors in the phase estimate of the channel coefficient. The proposed constellation is a combination of PSK and PAM constellations, where PSK is used to provide protection against phase errors, while PAM is used to increase the transmission rate using the knowledge of the magnitude of the channel ...

In this paper, we present feature-based technique for construction of mosaic image from underwater video sequence, which suffers from parallax distortion due to propagation properties of light in the underwater environment. The most of the available mosaic tools and underwater image mosaicing techniques yields final result with some artifacts such as blurring, ghosting and seam due to presence ...

Approach we have tested in our submitted runs. Our approach consists in finding links between video shot key-frames, based on the use of a probabilistic latent space model over local matches between the keyframe images. This allows the extraction of significant groups of local matching descriptors that may represent common characteristic elements of near duplicate key-frames. This is combined w...

We introduce an efficient random key pre-distribution scheme (RKPS) whose performance is 2 to 3 orders of magnitude better than schemes of comparable complexity in the literature. This dramatic improvement is achieved by increasing insecure storage complexity (for example using external flash memory). The proposed scheme is a combination of the Kerberos-like key distribution scheme (KDS) propos...

Security in sensor networks is more important than traditional networks as they are deployed in hostile environments and are more prone to capture. Trusted third party authentication schemes, public-key systems are not suitable owing to their high resource requirements. Key pre-distribution was introduced in [3] to solve this problem. Our scheme achieves identical connectivity compared to the r...

certificateless public key cryptography (cl-pkc) is a useful method in order to solve the problems of traditional public key infrastructure (i. e. large amount of computation, storage and communication cost for managing certificates) and id-based public key cryptography (i. e. key escrow problem), simultaneously. a signcryption scheme is an important primitive in cryptographic protocols which p...

The ample use of Wireless Sensor Network demands highly effective security mechanism for its sound operation in any hostile environment. The security of encrypted information greatly dependents on the rigidity of underlying Key Management techniques. Hence, key management becomes the most significant issue in case of security of Wireless Sensor Networks. The purpose of this paper is to assess m...

This paper generalizes previous optimal upper bounds on the minimum Euclidean distance for phase shift keying (PSK) block codes, that are explicit in three parameters: alphabet size, block length and code size. The bounds are primarily generalized from codes over symmetric PSK to codes over asymmetric PSK and also to general alphabet size. Furthermore, block codes are optimized in the presence ...