The elicitation of non-functional requirements (generic qualities of services) in the design and maintenance of services is an issue that has to be analysed under the perspective of the business (e.g. marketing, production, etc.) and information systems (e.g. requirements engineering, networks, etc.). In general, the solutions approach the final analysis service requirements at the expense of […]

The key benefits of using the smartphone accelerometer for human mobility analysis, with or without location determination based upon GPS, Wi-Fi or GSM is that it is energy-efficient, provides real-time contextual information and has high availability. Using measurements from an accelerometer for human mobility analysis presents its own challenges as we all carry our smartphones […]

Mobile image retrieval and pairwise matching applications pose a unique set of challenges. As communicating large amount of data could take tens of seconds over a slow wireless link, MPEG defined the CDVS standard to transfer over the network only the data essential to the matching, and not the entire image. However, the extraction of salient image […]

An omni-directional antenna array with wide band and low gain variation in the horizontal plane is proposed in this letter. The antenna unit of the array is composed of two vertically arrayed omni-directional elements and the associated feeding network. 3-D dipoles with vertical arms and parasitic dipoles are introduced in the antenna unit to significantly enhance […]

To overcome the ever increasing bandwidth demands of modern mobile radio applications, the use of spectral efficient modulation is necessary but not sufficient. Small cells are able to provide additional bandwidth at those locations where the traffic volume is high. Therefore, the number of small cells inside a larger macro-cell will be increased in the […]

Many-core embedded systems will feature an extremely dynamic workload distribution where massive applications arranged as an unpredictable sequence enter and leave the system at run-time. Efficient mapping strategy is required to allocate system resources to the incoming application. Non-contiguous mapping improves system throughput by utilizing disjoint nodes, however, the increasing communication distance and external congestion […]

The past decade has witnessed significant effort towards establishing reliable and information theoretically secure rates in communication networks, taking advantage of the properties of the communication medium. Such efforts include those in the wireless medium where simultaneous transmissions and the ensuing interference can prove advantageous from an information theoretic secrecy point of view. With the goal […]

Filter bank multicarrier (FBMC) modulation is a promising candidate as the primary physical layer waveform in next generation wireless networks. A great challenge in FBMC systems is channel estimation. A solution to this problem is preamble based channel estimation. In this paper we derive conditions for flat spectrum FBMC preamble construction. This kind of preamble offers […]