Physiological signals such as body temperature, heart rates and electrocardiogram (ECG) have been widely utilized for health monitoring applications. In order to detect the signals without cumbersome wires, heterogeneous body sensor nodes including wearable or implantable biomedical devices are wirelessly connected to each other forming a personal body sensor network (BSN) [1]. The physiologica...

In wireless ad-hoc networks, whenever a node overhears a frame, the node should defer its transmission to prevent the interference with the ongoing transmission. The exact duration value by which the node should defer is contained in the frame. However, due to the wireless transmission errors and due to the fact that the carrier sensing range is normally greater than the transmission range, a f...

We consider a secure transmission from a transmitter with multiple antenna to a desired receiver with a single antenna in the presence of an eavesdropper. In order to increase the secrecy rate performance, we propose an artificial noise (AR) based secure transmission scheme. Usually, in conventional schemes, transmission power reserved for the AR has been equally allocated to all orthonormal ba...

In this paper we consider cross-layer design for uplink transmission in an OFDMA-based cellular network with fixed relay stations (RSs) aimed to enhance performance. Since mobile stations (MSs) spend most of the power in the uplink to transmission, power efficiency resource allocation becomes very important to MSs. We develop a cross-layer optimization framework for two types of uplink flows (i...

In this paper, we consider a cross-layer design aimed to enhance performance for uplink transmission in an orthogonal frequency division multiple-access (OFDMA)-based cellular network with fixed relay stations. Because mobile stations (MSs) spend most of the power on the uplink transmission, power efficiency resource allocation becomes very important to MSs. We develop a cross-layer optimisatio...

A robust image transmission system incorporating perceptually-based coding and error protection is proposed for wireless channels. The perceptually-based image coder consists of a wavelet transformation, uniform quantization, and variable-length entropy encoding. The coded data is placed in a spatially scalable stream divided into segments of varying perceptual importance and tolerance to trans...