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In this paper, we propose a robust symbol timing synchronization method for IEEE 802.11n wireless LAN (WLAN) systems. Symbol timing synchronization using a preamble is affected by the timing of the packet detection and automatic gain control (AGC) completion. However, conventional methods assumed that symbol timing synchronization starts at the beginning of the preamble, which is typically invalid...
This paper presents an extended solution for the carrier frequency synchronization problem of multi input multi output (MIMO) orthogonal frequency division multiplexing (OFDM). The frequency synchronization scheme proposed by Minn et al. for OFDM systems is extended to be applicable for MIMO OFDM systems. This sequel uses the same training symbol as by Minn et al., the symbol is spread by orthogonal...
In mobile ad hoc networks, the unstable transport layer and inhibited amount of traffic being carried out by the network is owing to the high packet loss rates and frequent topological changes. It is essential that least available bandwidth and end-to-end latency along with congestion around a link are integrated in a QoS-based routing metric for MANETs. In this paper we develop a QoS-based, robust...
Home networking using powerline communication (PLC) system is evolving from simple voice service to multimedia platforms that offer a variety of services for home automation. The media access control (MAC) protocol used in the PLC network has to provide large flexibility and scalability to match these heterogeneous requirements. In this paper the MAC analysis using hybrid protocol, which is based...
The paper presents the design, implementation of the a unique type of computer controlled wireless mobile surveillance robot equipped with intelligence. Building an experimental autonomous mobile wireless vehicle, which has the ability to perform in real time environments is both a technical and scientific challenge and demands the development of systems for perception, modeling, planning and navigation...
Covert channels are secret communication paths, which existance is not expected in the original system design. Covert channels can be used as legimate tools of censorship resistance, anonimity and privacy preservation to address issues with rdquonationalrdquo firewalls, citizen profiling and other rdquounethicalrdquo uses of Information Technology. Current steganographic methods that implement covert...
DSSR is one of protocols for context-aware services in SANETs. By using user contexts, only the sensors that are relevant to a device's operating pattern transmit messages to the actuator. However there are some drawbacks for SANETs. To address DSSR problems, a routing protocol PAAR is proposed. Simulation studies show that our approach can lead to significant reductions in routing traffic and increases...
The biggest contemporary drawback in the maintenance and distribution of the global state is the increase in communication overheads. Therefore, localized routing is the method to avoid this problem. The network in this technique is inferred by the source nodes using statistics which are collected locally. The main aim of this paper is to present new localized algorithms to avoid some problems associated...
The 60 GHz band is of much interest since this is the band in which a massive amount of spectral space (5 GHz) has been allocated worldwide for dense wireless local communications. This paper gives an overview of 60 GHz channel characteristics. A propagation model for indoor wireless communication at 60 GHz is developed using electromagnetic theory. In dense multi path environments, the signal strength...
The important for Security system designs are required to be flexible enough to support multiple policies. While there are some approaches for implementing several different policies, how to support different models within the same policy family has not been answered with a satisfying solution. This is partly due to the limitation of traditional techniques for designing protection mechanisms, which...
The emergence of e-commerce has created new financial needs that in many cases cannot be effectively fulfilled by the traditional payment systems. Recognizing this, virtually all interested parties are exploring various types of electronic payment system and issues surrounding electronic payment system and digital currency. Broadly electronic payment systems can be classified into four categories:...
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