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This paper presents a methodology for simulating the Internet of Things (IoT) using multi-level simulation models. With respect to conventional simulators, this approach allows us to tune the level of detail of different parts of the model without compromising the scalability of the simulation. As a use case, we have developed a two-level simulator to study the deployment of smart services over rural...
The diffusion of indoor wireless localization has grown rapidly in last years. Many indoor location-based services have been proposed thanks to the knowledge of real-time position of active targets (i.e., using mobile wireless devices like smartphones and tablets). Most of the localization approaches rely on the processing of radio-frequency signals transmitted among the wireless access points of...
Bit error rate (BER) is an important parameter for evaluating the performance of wireless networks. In this letter, a realistic BER for indoor wireless transmissions is predicted. The prediction is based on a deterministic radio propagation model, the Multi-Resolution Frequency Domain ParFlow (MR-FDPF) model, which is capable of providing accurate fading statistics. The obtained BER map can be used...
In this work we consider the relay node placement problem in wireless sensor networks: where to position a limited number of available nodes that can act as additional relays to foward sensor data toward one or more base stations. The objective is to define relay node locations in order to improve network performance in terms of delivery ratio and end-to-end delay, and/or to provide connectivity in...
Performance evaluation of systems including, among others, components based on wireless links plays an important role both in the software and hardware engineering. In both cases the earlier evaluation of performance characteristics has been proved to be a key-factor for a successful design of new systems. However, most of the quantitative analysis methods suffers the problem of not being scalable...
This paper presents "SimPlayGround" - a framework for the stimulative evaluation of reactive and proactive power-management approaches in distributed energy harvesting systems. Our simulation framework combines the simulation of wireless communication, the behavior of reversible power supplies and the dynamics of power consumption. It supports models of the environmental power and energy...
The project will address two main challenges of prevailing architectures: 1) The global interconnect and memory bottleneck due to a single, globally shared memory with high access times and power consumption, 2) The difficulties in programming heterogeneous, multi-core platforms, in particular in dynamically managing data structures in distributed memory. MOSART aims to overcome these through a multi-core...
Service-area specific optimization is a necessity for large-scale wireless networks. For this task, a model to estimate the quality of a radio network configuration is required. In the case of cellular radio networks, much work exists on models for Radio Network Planning (RNP). This work cannot be applied to optimize IEEE 802.11-based Wireless Mesh Networks (WMNs), as their multi-hop structure and...
This paper presents the PiccSIM Toolchain: a graphical user interface with design tools for the network and control co-simulation platform PiccSIM. The proposed tool-chain enables easy network and control design and improved co-simulation via an integrated graphical user interface. It supports implementation of the simulated algorithms on actual wireless sensor network nodes. The developments presented...
In this work, we propose the multichannel two- dimensional (2D) autoregressive (AR) model for multiple-input multiple-output (MIMO) wideband mobile wireless channels. The parameters of the proposed model can be estimated from the real- world measurement data. For this purpose, we suggest using a straightforward extension of the prediction error minimization (PEM) algorithm. We also address the problem...
Generative models hold the promise of reducing the computational load and cost caused by directly simulating a real system. They are vital to the design and performance evaluation of error control schemes and high layer wireless communication protocols. Therefore, designing an efficient and accurate generative model is highly desirable. Moreover, the errors encountered in digital wireless channels...
Fast design and verification is becoming a necessity for electronic industry to hit the more and more restrictive market requests. The model-based approach represents a possible way to ensure fast and flexible system design and verification, allowing a quantitative exploration of the space of solutions. In this paper the SystemC environment has been used to design a complete TLM model of IEEE 802...
Medium access control (MAC) protocols have a large impact on the system performance for wireless ad hoc networks. Because of the limitations of existing analytical models for ad hoc networks, many researchers have to study the impact of MAC protocols via discrete simulations. In this paper, in order to improve this disadvantage, we provided an analytical model to compute of 802.11 DCF wireless multi-hop...
In this paper, we propose a robust STBC transmission scheme to combat the timing synchronization errors over frequency-selective multiple-access channels. First, the equivalent channel model in the presence of timing synchronization errors is derived and we find that the synchronization errors result in an equivalent channel model with larger number of correlated channel taps. Based on this correlated...
A principal factor in sensor network design is energy efficiency. In this work, we propose to extend the lifetime of sensor networks using appropriate choice of sensor node distribution. The key idea of our scheme is to deploy more nodes in areas of extensive energy usage. Using this scheme of sensor node distribution, we use probabilistic angular routing to route data packets from the sensor nodes...
In this paper we present an algorithm, based on power management of access points (AP), to reduce congestion in wireless local area networks (WLANs). The algorithm finds the most congested access point (MCAP) and adjusts its transmitted power in discrete steps and determines the optimal userspsila assignment such that an optimal load distribution is achieved. Results show that the algorithm is capable...
More and more users subscribing to wireless broadband services are seeking to have access to both WLAN and UMTS networks. We study individually optimal user-network association in an integrated WLAN and UMTS hybrid cell. The association problem is formulated within a non-cooperative game framework. In the formulation, mobile arrivals are assumed to follow the Poisson process and each mobile considers...
In this paper, we study bandwidth management of a wireless/optical based access/metro network in support of voice and data services. For voice services, we use a finite state Markov Chain to estimate the blocking probability of voice circuits over an Adaptive modulation and coding wireless channel, as a function of the channel parameters. For data services, we evaluate a rate matching and a buffer...
In this paper, we address the issue of transmission power control (TPC) in wireless ad hoc networks. Power control plays an important role in energy saving and network performance enhancement. However, the existing TPC schemes either face the problem of hidden and exposed terminal or have additional hardware requirements. We propose a novel distributed power control protocol, called Receiver Initiated...
In this paper, we propose an adaptive pacing scheme at the link layer for IEEE 802.11 based multihop wireless networks. Our objective is to improve the performance of higher layer protocols without any modifications to them. Our adaptive pacing scheme estimates the four-hop transmission delay in the network path without incurring any additional overheads, and accordingly paces the packets to reduce...
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