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With the rapid growth of user demands, and the limitations of third generation (3G) mobile communication systems, it is expected that fourth generation (4G) mobile systems are likely to reach the consumer market in another 4-5 years. 4G systems are expected to become a platform capable of providing increased bandwidth, higher data rates, and greater interoperability across communication protocols,...
Fast innovation speed in the hardware and software technologies in the field of embedded robot systems, it becomes more and more necessary to develop applications based on methodologies, which take to account the easiness of future modifications, updates and improvements. According to these requirements, mobile robot is designed to convey basic knowledge about the basic block technologies that make...
Orthogonal frequency division multiplexing (OFDM) systems are sensitive to timing and frequency estimation errors, which cause inter-symbol-interference (ISI) and inter-carrier-interference (ICI), leading to degradation in the system performance. In this paper, optimized implementation of synchronization algorithm for cellular reuse-1 OFDMA systems, compatible with IEEE 802.16d/e wireless MAN standard...
To support mobile/wireless networking environment, we consider a mobile router which is connected via dual interfaces with WiBro (i.e., Mobile WiMAX) and high-speed downlink packet access (HSDPA) in a moving vehicle. The mobile router can support multihoming features using the extended version of mobile IP (MIP) protocol for multiple interfaces. In our multihoming environment, we propose the dynamic...
In this paper, GTAP-BRM (game theoretic access probability based bandwidth request mechanism) is proposed for WiMAX PMP (point to multipoint) network. In the reference standard, IEEE 802.16, connections belonging to QoS (quality of service) class rtPS (real time polling service) are provisioned to issue BW-REQ (bandwidth request) in contention free way while nrtPS (nonreal time polling service) can...
As a prospective intelligent transport systems (ITS) technology, vehicular ad hoc networks (VANETs) have recently been attracting an increasing attention from both research and industry communities. These networks have no fixed infrastructure and instead rely on vehicles themselves to provide network functionality. In this paper we review the related literature on VANETs characteristics and provide...
Smart antenna is recognized as promising technologies for higher user capacity in 3G wireless networks by effectively reducing multipath and co-channel interference. Advent of powerful, low-cost, digital processing components and the development of software-based techniques has made smart antenna systems a practical reality for both base station and mobile station of a cellular communications systems...
We have designed a heterogeneous mesh router for wireless mesh networks (WMNs), using a network processor. WMN is a multi-hop wireless network, comprising two kinds of nodes - mesh routers and mesh clients. One of the primary concerns in such networks is that of routing in a heterogeneous setup. Microsoft Research has developed a mesh connectivity layer (MCL) for computers that use Windows operating...
Wireless Sensor Networks (WSNs) is a collection of a large number of sensor nodes with sensing, computation and wireless communication capabilities. Dead end problem is one of the challenges that occurs in greedy forwarding. When a message is forwarded to a node that has no neighbors closer to destination than itself, it causes greedy forwarding to fail at that node. In this paper, we propose energy...
Multiple antenna wireless technology and orthogonal frequency division multiplexing (OFDM) have the potential to enable high data rate wireless applications. While the multiple-input multiple-output (MIMO) wireless techniques exploit spatial domain for improving the quantity and reliability of the data transmitted, OFDM converts the frequency-selective broadband channel into a bank of narrow band...
The performance of the minimum mean squared error (MMSE) based adaptive multiuser detection (MUD) of direct-sequence code-division multiple access (DS-CDMA) signals in dispersive and non-dispersive channels is considered. DS-CDMA is a popular multiple-access technology for wireless communication. However its performance is limited by multiple-access interference (MAI) and multipath distortion. Adaptive...
In this paper a novel mechanism for explosive trace detection in any populated area by the use of mobile telephony has been described. The aim is to create a system that will assure common men, local population and above all the nation a secured environment, without disturbing their freedom of movement. It would further help the police in detection of explosives more quickly, isolation of suicide...
Analytical solutions for the average symbol error rate of coherent M-ary frequency shift keying (MFSK) modulation schemes operating over frequency non-selective slow fading channels corrupted by additive white Gaussian noise (AWGN) are derived. Starting from the alternate expressions for integer powers (n < 5) of Gaussian Q function, the symbol error probabilities (SEP) are obtained using probability...
Reliability of radio link is limited due to path loss, shadowing and multi-path fading, thereby necessitating the use of some type of diversity. Cooperative relaying has gained considerable attention in recent years. Relays cooperates in such a way that they share their antennas and other resources to create a virtual array through distributed transmission and signal processing. Energy issue for such...
Here we propose a wireless communication based railway information system will satisfy the requirements of next generation railway information system (RIS). Here we propose the overall implementation scheme for updating running train information in railway information system using wireless technology. The paper aims at enabling deployment of innovative, cost-effective and interoperable wireless communication...
This paper proposed a portable wireless data acquisition system for temperature in real time process dynamics. Process variables (like temperature, pressure, flow, level) vary with time in certain applications and this variation should be recorded so that a control action can take place at a defined set point. This paper proposes an 8 bit embedded platform for a sensor having a network interface using...
The world of wireless communication has grown very fast over the past few years. Wi-Fi access points have now become very common feature in homes, campuses and public places. In these applications, high-speed, low cost and high security is desirable. Radio frequency (RF) transmission is used in most of the wireless applications. However, the RF spectrum is so congested that it is very difficult to...
Sparse multi-path channels (MPC) are often encountered in several wireless communications. Exploiting the sparse property of MPC, several estimation methods have been proposed in recent years. Unlike the previous methods based on either dense MPC or sparse MPC models, we propose a novel MPC estimation method based on a generalized hybrid MPC model. The existed least squares (LS) and sparse component...
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