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In this paper, a wideband multiple-input multiple-output (MIMO) simulation model for vehicle-to-vehicle (V2V) channels in T-junction propagation environments is proposed. This simulation model takes the exact relationship between the angle-of-arrival (AOA) and the angle-of-departure (AOD) into account. In order to determine the parameters of the simulation model, the Riemann sum method (RSM) is applied...
The paper proposes a cooperative distributed target tracking algorithm in mobile wireless sensor networks. The main component in the algorithm is distributed sensor-target assignment. In the key idea of the sensor-target assignment, sensors are considered as autonomous agents and the defined objective function of each sensor concentrates on two fundamental factors: the tracking accuracy and the tracking...
The advent of ubiquitous IP networks enables users to freely move and continue network services anytime, anywhere by means of mobile handheld devices. This paper exploits network ubiquity and advanced device capability to develop a novel mobile group communication system. Our work presents the design and implementation of a proof-of-concept software system. This system architecture consists of four...
A method for estimating the Doppler spread in mobile orthogonal frequency division multiplexing (OFDM) systems is described. The estimation is based on phase message of time domain channel estimation over several OFDM symbols. In OFDM systems, channel estimation is popularly performed in frequency domain. Channel frequency response estimates are affected by noise and inter-carrier interference (ICI)...
In this paper, a novel isotropic scatter distribution wideband fading channel model for MIMO mobile-to-mobile (M2M) is proposed. The starting point for the derivation of the model is a new T-intersection geometric street scattering model, where both single-, double-bounced scattering mechanisms are assumed. Our geometry-based channel model takes into account the exact relationship between angle of...
In this paper, a new wideband multiple-input multiple-output (MIMO) fading channel model for vehicle-to-vehicle (V2V) communications is proposed. The MIMO V2V channel model, called for brevity T-model, captures the propagation effects that occur if vehicles move towards a junction with a side road and corner buildings. The starting point for the derivation of the T-model is a new geometric T-junction...
In this paper, an efficient and practical design for Doppler spread estimation in mobile OFDM systems are described. A channel auto-correlation function algorithm is proposed for Doppler spread estimation. The Doppler spread estimator is based on finding the auto-correlation function of time domain channel estimates over several OFDM symbols. The estimation performance of the estimator is evaluated...
In future, cars will form a network with other cars and roadside data systems to exchange information that alerts the driver on traffic congestion, road conditions, and accidents. It is expected that vehicle-to-vehicle communication systems will play an important role in intelligent transportation systems. MIMO systems employ multiple transmit and multiple receive antennas, combined with the opportunities...
IEEE 802.16e standard has been proposed as a specification for the next generation wireless communication system. Synchronization plays an important role for a wireless receiver. Because the repetition of preamble is unapparent in orthogonal frequency division multiple access (OFDMA) modulation mode, a correlation based scheme like match filter is used to estimate the symbol boundary and integer carrier...
Recently there are many different approaches to the modeling and simulation of mobile radio fading channels. In this paper, tow kinds of improved Jakes' simulators for Rayleigh fading channels are introduced and the second-order statistics of these improved Jakes' simulator are analyzed. On comparison of some importance statistical properties of the classical Jakes' simulator, it is proved that the...
Mobile ad hoc networks are vulnerable to various types of denial of service (DoS) attacks for the absence of fixed network infrastructure. The gray hole attack is a type of DoS attacks. In this attack, an adversary silently drops some or all of the data packets sent to it for further forwarding even when no congestion occurs. Firstly, DSR protocol, aggregate signature algorithm and network model were...
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