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Evolution of modern communications and radar systems have steadily increased the demand on modelling the propagation effects with real world scenarios for various signal types. The main purpose of this research is to create a flexible, generic and realistic Radio Frequency (RF) environment simulator including both radar and communication signals. Software defined radio (SDR) platform has been utilized...
This paper is concerned with power and rate control for wireless communication networks with nonlinear channel fading. A new mathematical model of power and rate control system is derived, and a robust power and rate controller is designed based on sliding mode control. A sufficient condition for the existence of stable sliding surfaces is established via linear matrix inequality, and the controller...
The network selection problem in a heterogeneous network environment is studied in the paper. A 3-Param network selection algorithm for CR terminals is proposed. Both the factors that are sensed by the CR terminals and the factors that cannot be gained beforehand are taken into account in the algorithm. Through the evaluation of the primary networks integrating these factors, the algorithm will make...
Femtocaching is an effective and low-cost way to address the explosively increased wireless traffic demand driven by video-on-demand (VoD) streaming. Most existing caching policies are optimized for file downloading service, which are not necessarily optimal for the quality of experience of users requesting VoD service. In this paper, the caching policy for VoD service is investigated, where the adaptation...
Following the explosion of Internet-enabled mobile devices and mobile services, users tend to expect network connectivity everywhere they go and at any time. In anticipation of these higher connectivity expectations and requirements especially for vehicular communication, several technologies like WiMAX, cellular networks (i.e., 3G/4G) and wireless mesh networks have been developed. While cellular...
With the emerging demands for the large-scale services, Device-to-Device (D2D) communication has been viewed as a promising technology to improve the network capacity and user experience. In particular, the peer discovery is the first step to establish a D2D communication. Considering that quality of experience (QoE) is an important metric in video services, We propose a QoE-driven peer discovery...
Sharing Transmission Opportunity period (TXOP) technique is recently defined by IEEE 802.11ac to allow simultaneous downlink transmissions. In this paper, we focus on the basis of this technique and the behavior of the access point (AP) to manage the multi-user access. We discuss the different steps required to allow simultaneous downlink transmissions. Based on simulation results, we prove that TXOP...
Ns-3 is a widely used as a the network simulator of choice by researchers. It contains many well tested and high quality models of network protocols. However, the application layer models of ns-3 are very simplistic, and do not capture all aspects of real life applications. As a result, there is often a huge gap between the results of real experiments and the corresponding simulations. This problem...
This letter investigates an achievable channel coding rate and mean delay of point-to-point energy harvesting wireless communication system with finite blocklength, which has vital practical interest. We get the achievable channel coding rate’s exact formula and find it increases along with blocklength. Furthermore, the mean delay’s lower-bound is also obtained.
Device-to-device (D2D) communication, where user equipments (UEs) in proximity communicate directly with each other, is an alternative technology for densification in future wireless communications featuring extremely dense and heterogeneous networks. The intrinsic characteristics of D2D communication include (1) limited energy capacity of battery powered UEs, (2) necessary power consumption to maintain...
Named Data Networking (NDN) is a data-centric architecture designed for the future Internet. Existing works show that NDN brings significant performance improvement for typical content-centric applications, and can also fit the mobile environment well. However, directly applying NDN to Vehicular Ad hoc NETworks (VANETs) is confronted with great challenges due to the high mobility of vehicles. Most...
The complementary cumulative distribution function (CCDF) of delay in a wireless communication system can be approximated by the effective capacity model. However, it is still unknown if such a distribution function can be approximated analytically and accurately. In this paper, we consider a system model with a Nakagami-m fading channel and an exponential arrival process, and derive a simple approximation...
The packet scheduling problem has been deeply studied for lot of years by researchers in the computer science and telecommunications fields as an important solution that decides the order in which packets are sent over a link in order to provide QoS on a network. Recently, the packet scheduling has become again a challenging topic due to the massive use of wireless technologies (e.g. WiFi, LTE, 4G/5G),...
The design of wireless embedded systems needs their efficient and realistic simulation to verify that requirements are met. The reproduction of communication behavior is crucial to assess the performance of hardware and software components, e.g., dependability and energy consumption. This work presents and discusses different levels of abstraction for the simulation of the communication behavior....
Multi-Channel Wi-Fi experiments are quickly becoming more common and relevant as Wi-Fi deployments have become extremely popular and dense in recent years. There are many simulation tools available for Wi-Fi simulation, but few are widely used, and some are not designed specifically with wireless in mind. In this paper, the NS3 environment is recognized as a promising tool for which for this type...
This paper addresses security and performance issues of MANET. A novel cluster oriented concept is proposed to enhance security and efficiency of the network. Proposed strategy insures the optimum performance of MANET in presence of black hole attack. The simulation of the proposed methodology is carried out using NS2 network simulator and the simulation results reflects the performance of scheme...
We study the problem of designing downlink scheduling policy for wireless networks with both real-time and non-real-time flows. Most existing scheduling policies for these networks unfairly favor one type of flows. As a result, strategic clients may lie about their types of traffic in order to get more service from the base station. To counter these strategic behaviors, a scheduling policy should...
Supporting a large number of devices in LTE Machine-to-Machine (M2M) communications is a big challenge. The large number of devices will try to access radio resource in a short period of time which may result in severe congestion to the Radio Access Network (RAN). Hence, how to scatter the devices, which are always trying to access to a same eNBs (evolved Node B), to other eNBs has become an important...
The IPv6 over Low power Wireless Personal Area Network (6LoWPAN) has attracted lots of attention recently because it can be used for the communications of Internet of things (IoT). In this paper, the concept of group-based network roaming in Proxy Mobile IPv6 (PMIPv6) domain is considered in the 6LoWPAN-based wireless body area networks. PMIPv6 is a standard to manage the network-based mobility in...
This paper presents, through simulation experiments, a performance study of both IEEE 802.11n aggregation methods: A-MPDU (Aggregated MAC Protocol Data Unit) and A-MSDU (Aggregated MAC Service Data Unit), considering scenarios of video streaming. The objectives of this article are: (i) investigate the quality of service achieved, (ii) show which of the two methods of aggregation (A-MPDU or A-MSDU)...
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