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This paper addresses the subband allocation for femtocells in the presence of asynchronous cochannel interference in OFDMA based cellular network. A method is presented here to find the subband least affected by interference and this subband is then used for communication within femtocells. Using an energy based approach, synchronized as well as asynchronized arrival of interfering frames are addressed...
The radiation of complex sources in either free-space or reflecting environments is described through a statistical approach involving the field-field correlation function. A representation in phase-space, the Wigner distribution function, is used to unveil the wave mechanics of waves propagated in the near-and far-fields. An evolution operator for these Wigner functions is derived and approximation...
Bit-error probability (BEP) of a digital communication system subjected to interference can be approximately derived from the amplitude probability distribution (APD) of the interfering signal. In this paper, it is pointed out that the approximation underestimates maximum BEP of a multilevel modulation scheme when the interference is impulsive, which is undesirable in regard to setting emission limits...
The IEEE 802.11p standard will in the next years be introduced for vehicle-to-vehicle and vehicle-to-infrastructure (V2X) communication. Some of the services in this standard are dedicated to active road safety applications and can therefore be sensitive to radio interference. Since the system is based on Automatic Repeat Request (ARQ) and Carrier Sense Multiple Access (CSMA), interference problems...
A worst-case approach to development of nonlinear models for RF front-ends and components is proposed. This approach makes it possible to avoid the omission of nonlinear interference in process of the computer simulation, which is very important for EMC analysis. Based on the proposed approach, we developed a technique for synthesis of the models intended for the use in framework of the discrete nonlinear...
This paper investigates the aggregate interference from interweave cognitive secondary nodes spatially distributed in a finite Poisson field. These secondary nodes sense an out-of-band beacon to initiate their transmissions, which can be concurrent with those of the primary system if a sensing error is made. The resulting aggregate interference is analyzed in this paper. For this purpose, general...
In wireless sensor networks (WSN), capacity estimation and signal to noise ratio calculation are challenging problems with many research attentions. In this paper, which is a small part of a larger research, we propose two new methods to attain precise and approximation estimation of SINR distribution in WSN. These methods are combinations of probabilistic techniques and clustering approach, incorporating...
The outage performance of an amplify-and-forward two-hop multiple-access channel is studied for the interference-limited environment Assuming that the destination encounters distinct-power co-channel interference, the exact integral-form expression of the outage probability is firstly derived. To decrease the computation complexity, an approximation of the outage probability is then derived in closed...
In this paper we consider a decode-and-forward cooperative network, which is active in the same bandwidth as a primary user network. The cooperative or secondary user network applies a dynamic resource allocation algorithm to maximize its own performance while limiting the interference caused at the primary user receivers. The main contribution of this paper is the proposition of a new accurate approximation...
In this work, the autocorrelation and autocovariance functions of the channel state information (CSI) in a multi-cell mobile network with fast fading is derived analytically. The derivation is based on the Rayleigh fading model. A squared Bessel function is found to be a good approximation of the autocovariance. Simulations confirm both the analytical result and approximation to be accurate for short...
In heterogeneous networks (HetNets), the load between macro-cell base stations (MBSs) and small-cell BSs (SBSs) is imbalanced due to transmit power disparities and ad-hoc deployment of SBSs. This significantly impacts the system performance and user experience. Associating more users to the SBSs is an effective way to solve this problem. In this paper, we formulate the user-BS association problem...
Relay-aided cooperative communication is a critical component of next generation cellular networks as it improves coverage and boosts system capacity. In this paper, we use stochastic geometry to study the performance of partial decode-and-forward (PDF) relaying through another idle user in uplink cellular communication. We analytically derive the average inter-cell interference power caused by system-wide...
The Edgeworth expansion approximates nearly Gaussian distributions in terms of cumulants. This expansion is developed within the framework of First Kind Statistics, where definitions are derived from the Fourier transform. Alternatively, the framework of Second Kind Statistics offers analogous definitions which are derived from the Mellin transform. Although a formalism with such similarity to the...
The spatial locations of transmitters play a cardinal role in evaluating the aggregate interference and hence the performance of large wireless networks. The most widely used approach for modeling the network geometry is the Poisson point process (PPP), mainly due to its analytical tractability. However, point process models with repulsion and inhibition, such as the Matérn hardcore process, the Strauss...
This paper focuses on the resource allocation within an asynchronous ad hoc network that utilizes two different modulation techniques: orthogonal frequency-division multiplexing (OFDM) and filter bank based multicarrier (FBMC). More specifically, we investigate the problem of downlink sum rate maximization. The NP-hard formulation is first decomposed into two subproblems in order to decrease the computational...
We study stable wireless link scheduling under the physical interference model in wireless networks. Given a set of elastic wireless communication requests arriving in an online fashion, the objective is to perform link scheduling to maximize the network throughput capacity. This well-motivated problem under an arbitrary physical interference model is notoriously hard. In this work, we develop efficient...
This paper introduces a stochastic geometry model of a cellular network in which users exchange videos through out-of-band device-to-device (D2D) communications. Users are grouped into clusters, in which a user-based distributed cache is formed to satisfy in-cluster video requests through D2D, avoiding the base station. This paper studies how many of these requests could be served, considering two...
This paper presents a system model that enables the analysis of indoor downlink performance in urban two-tier heterogeneous cellular networks. The urban building topology is modeled as a process of randomly distributed circles. Each building is deployed with an indoor small cell with a certain occupation probability. Macro base stations are sited outdoors. Their signals experience distance-dependent...
In this work, we investigate downlink co-channel interference in wireless cellular networks. Our main target is to facilitate statistical analysis in networks with regular grid layout. In particular, we focus on the interference statistics outside the center of a grid scenario. First, a novel circular interference model is introduced. The key idea is to spread the power of the interferers uniformly...
In this paper, we study the Minimum Latency Collection Scheduling (MLCS) problem in Wireless Sensor Networks (WSNs) adopting the two interference models: the graph model and the more realistic physical interference model known as Signal-to-Interference-Noise-Ratio (SINR). The main issue of the MLCS problem is to compute the minimum latency a schedule, that is, to compute a schedule with the minimum...
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