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Transmission strategies for millimeter wave systems have become a promising strategy to achieve a higher quality of service in the network. Those strategies stem out from various network optimization criterion retaining a harmony between the quality of service and energy incurred to the system. In this paper, we address two such network optimization strategies, namely — transmit power minimization...
We study frameless ALOHA with multiple base station (BS) cooperation, where the coverage area of each BS partially overlaps, and the BSs cooperate via a backhaul network to share successfully retrieved packets. The exact packet loss rate for networks with the arbitrary number of BSs is theoretically analyzed, which reveals how the throughput improvement is achieved. Computer simulations confirm that...
Creating an efficient localization algorithm for Internet of Things (IoT) and heterogeneous networks has been of the greatest challenges in the recent years for the researchers and industries. There has been significant efforts to increase the estimation accuracy and computational speed of localization algorithms either by improving the already existing ones or proposing new solutions. In this paper...
We characterised the physical layer security of a three terminal cooperative network with full-duplex relaying under Nakagami-m channel analytically and through simulation. An eavesdropper also coexists within the system at an arbitrary distance from the transmitter. Using secrecy outage probability as a metric to characterise the secrecy performance, integral expression for the corresponding outage...
The transmit beamforming for millimeter wave systems has become a promising strategy to achieve higher spectral efficiency. The beamforming design for such systems stems out from various network optimization criterions that strike a balance between quality of service and energy/cost incurred to the system. We offer a simple and comprehensive solution to one of such key network optimization problems,...
The usage of the higher frequency band in the millimeter wave systems implies higher pathloss, despite its elegance in providing an enormous spectrum for future cellular networks. Such systems rely on beamforming and precoding/combining techniques with large number of antennas to achieve adequate operational link margin. The requirement of complete channel information is hence imperative for such...
We consider a full-duplex (FD) multi-user multiple-input multiple-output (MIMO) system where the base-station (BS) serves multiple uplink (UL) and downlink (DL) users simultaneously. We address the robust weighted sum-rate maximization (WSRM) problem, in which the transmitted rate over an arbitrary link is maximized subject to transmit power constraints imposed at the FD base-station and UL users...
In this article, we propose a receiver chain alignment (RCA) method to evaluate the degrees of freedom (DoF) of symmetric three-user multiple input multiple output (MIMO) interference channel (IC). The interference observed at the adjacent receivers is represented in a chain of optimal overlap subspaces, the dimension of which is determined merely by the topological information (antennas sharing)...
This paper addresses the problem of vehicle position estimation in dense urban environments, where traditional global positioning system (GPS)-based localisation techniques are severely affected by non line-of-sight (NLOS) signal propagation and multipaths presence. Assuming that GPS signals are fairly received only by a very small fraction of vehicles at the border of the urban environment, we propose...
In this paper, we determine the optimal battery capacity for an energy harvesting wireless node. The goal is to achieve transmission performances similar to an identical system, but with infinitely large battery. In our previous work, addressing a node without any energy storage constraints, we proposed a policy to optimize instantaneous transmission rate in order to maximize the average transmission...
In this paper, the secrecy-rate characteristics of multitier downlink heterogeneous networks under generalized fading model is investigated for two types of base-station (BS)-user(s) association scenarios. Each tier within the network has a single multiantenna BS that intends to serve multiple single-antenna mobile users. These users are assumed to be distributed according to homogeneous Poisson point...
The usage of hybrid network consisting of massive multiple input multiple output (MIMO) co-existing with small cell networks (SCNs), are considered to be a key technique for the future wireless communication systems. However, the co-existing SCNs not only require on-site hardware installation, but also increase the static power of the system thereby reducing the energy efficiency (EE). To circumvent...
We provide a framework to infer causal relationships in a system of multivariate, stochastic, delayed signals, with application to their prediction. First we address the dimensionality problem in information causality estimation and propose a method to improve the efficiency of calculations by retaining only the most essential components. The directed information between pairs of signals are then...
The usage of perfect and instantaneous CSIT in a SINR-constrained transmit power minimization requires excessive resources to acquire and distribute channel information. Recent works relying on statistical SINR constraints designed under prescribed outage loosens the original constraint in converting statistical inequalities to deterministic convex equivalents. In this paper, we offer a simple solution...
In this article, we explore the application of alignment matrices as applied to non-linear dimensionality reduction [1]–[3] in the analysis and solution of interference alignment schemes for wireless communications systems, with antennas sharing at the receivers. We propose an algorithm that aligns the interference when the antennas are shared in ring topology among three receivers. It is also shown...
We study the power optimization policy to maximize the average transmission rate in an energy harvesting wireless network. The addressed scenario considers an energy harvesting transmitting node where the energy arrives in discrete packets following a Poisson process. The challenge is then to optimally model the transmission period T according only to the statistical knowledge of the energy arrival...
The majority of recent literature characterizes the secrecy capacity of wireless random networks by relying on Poison Point Processes which model the spatial distribution of devices. However, the realistic topologies are distinct from uniform and random assumption of the base stations or users. It has been recently demonstrated that Matérn Hard-core Point Processes (MHCPP) — rather than Poison Point...
We examine the upper and lower bound of the secrecy outage probability of primary links in cognitive wireless sensor networks employing power control scheme. The power control law is adopted in order to govern the transmission power of a cognitive radio node and there by limit interference incurred to the neighboring cognitive radio user. An accurate expressions for the probability density function...
The signal to interference and noise ratio (SINR)-constrained transmit (TX)-power minimization problem, incorporating perfect and instantaneous channel state information at the transmitter (CSIT), culminates in higher overhead and extensive backhauling, likewise average CSIT suffers from quality fluctuations. Also, methods relying on the statistical SINR constraints require several algebraic steps...
In this paper we address the dimensionality problem regarding information causality estimation and propose a new method to approximate directed information by identifying and eliminating superfluous calculations. Using only the most informational components we reduce conditional mutual information terms while capturing all the instantaneous or lagged dependencies between stochastic signals. Our method...
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