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The following topics are dealt with: multiple access communications; medical applications networking; vehicular networking; cooperative mobile networks; cognitive wireless networks and systems; green communications; LTE evolution; public safety communication networks.
Mobile ad hoc network consists of nodes with mobility thus resulting in frequent route breakage. Considering this problem, in this paper, we propose a novel routing algorithm which constrains the distance to next relay node to increase route life time in mobile ad hoc networks (MANET). By limiting the distance to next relay node, our algorithm lengthened route lifetime and enhanced the throughput...
Mobile ad hoc networks will often be deployed in environments where the nodes of the networks are unattended and have little or no physical protection against tampering. The nodes of mobile ad hoc networks are thus susceptible to compromise. The networks are particularly vulnerable to denial of service (DoS) attacks launched through compromised nodes or intruders. In this paper, we investigated the...
We mathematically analyze a sleep mode operation proposed by Samsung for IEEE 802.16 m. The sleep mode operation for downlink traffic is modeled as a 2-dimensional Markov chain. We obtain the power consumption of a mobile station. We show that the power consumption of a mobile station decreases as the sleep cycle increases and the analytical results also match with the simulation results very well.
In what follows a novel quasisynchronous FH-MC-CDMA system with threshold reception is introduced. An expression for the optimum (in maximum a posteriori sense) threshold value is obtained. Error and erasure probability values for the system under consideration are estimated.
According to the interworking authentication trends, this paper has proposed a novel reference of interworking AAA architecture among 3GPP, WiMAX and WLANs. Moreover, based on the proposed architecture, a hierarchy AAA mobility management architecture is brought forward, as well as a dynamic reorganizing management scheme authentication domain. Finally, the simulation results show that the total cost...
This work proposes the steps to design a high efficiency inverse class F power amplifier (PA). In the first step, the optimal termination conditions for the inverse class F are extracted through load-pull measurement. Afterward, low loss and precisely tunable output matching network was chosen in order to obtain high efficiency of the PA. The fabrication of an inverse class F power amplifier for WiMAX...
We propose a new location-based stochastic routing approach that is well-suited for wireless sensor networks deployed for public safety applications such as emergency evacuations or search and rescue operations. We first introduce a new modeling and evaluation framework based on Markov chains for randomized routing. Based on this evaluation framework, we study the load balancing and routing performance...
This paper addresses the issues related to CCTV applications as a public safety application on the move. Video surveillance cameras are currently becoming important tools for the public safety agencies. Enhanced CCTV surveillance systems can automatically spot suspicious behaviour and raise an alarm. The CCTV application is one of the key challenging services under the future public safety communication...
The power allocation problem with co-channel interference is studied in multi-cell OFDMA cellular relay systems. Based on non-cooperative game theory and using a two-hop data rate balance, a distributed multi-cell power allocation (DMPA) algorithm is proposed, which reduces the transmission power cost and improves the system throughput. The non-cooperative power allocation game model is given in the...
In this paper, assuming the channel state information (CSI) is only known at the receivers, the ergodic and outage capacity of cooperative diversity systems with an arbitrary number of half-duplex relays are analyzed under independently not necessarily identically distributed Rayleigh fading channels. Approximated closed-form analytical expressions for the calculation of ergodic and outage capacity...
The CAR-2-X communication SDK is a software implementation of a networking protocol stack for car-to-car and car-to-infrastructure communication with IEEE 802.11 radio technology. The core of the SDK is a routing protocol that provides wireless ad hoc and multi-hop communication using geographical positions for addressing and packet forwarding. The routing protocol scheme is enhanced by various features...
The introduction of the vehicle infrastructure integration (VII) initiative by the US Department of Transportation (USDOT) has recently attracted the attention of researchers and given rise to a plethora of studies, each one seeking to enhance the safety and efficiency of transportation networks in one way or another. Moreover, vehicles communicating with each other and with the infrastructure, render...
Cooperative relaying has drawn great interest to mitigate the negative effects of small-scale fading in distributed wireless networks. This paper analyzes radio resource allocation in cooperative relaying with proactive relay selection. Due to the introduction of the relay into the communication link an over-expenditure of resources can take place similar to the classical exposed terminal problem...
Multiaccess wireless networks have emerged as an active research field but, until now, previous work has mainly centered on integrating wireless LANs with cellular networks. With mobile WiMAX deployments increasing, many expect fierce competition between 3GPP and WiMAX Forum mobile broadband technologies. We take a different approach in this paper and study cooperative multiaccess in an urban scenario,...
We propose a new framework to analyze performance considering finite-length queuing and adaptive modulation and coding (AMC) for multi-user VoIP services in wireless communication systems. We formulate an uplink VoIP system as two-dimensional discrete-time Markov chain (DTMC) based on a Markov modulated Poisson process (MMPP) traffic model and MCS (modulation and coding scheme)-level set transition...
Excessive power consumption is a major problem in wireless communication. This is particularly true in ubiquitous computing environments, since wireless devices consume a considerable amount of energy in idle listening. Wake-up wireless communication technology is a promising candidate for reducing power consumption during idle listening. To realize wake-up wireless communication, this paper proposes...
The UTRAN long-term evolution (LTE) specifications provide flexible means to achieve micro-sleep operation for user equipment (UE) even though it is in active mode and running a service. By means of a discontinuous reception (DRX) framework, pauses in the transmission due to natural traffic characteristics or network prioritization can be utilized. The specifications give a number of options to optimize...
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