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For massive MIMO system, few research has been done for multipath frequency selective fading model among all literatures. Hence, in this paper we propose a 2-stage multibranch linear MOE (minimum output energy) receiver which collects symbols from different paths to deal with frequency selective fading environment. Due to the big number of antennas, we are using sample covariance matrix other than...
This paper focuses on the beneficial effects brought by the presence of multiple receivers to a slotted Aloha scheme. Starting from an analytical angle, we review and compare some recent results that characterize the throughput of such systems under different channel models, based on the assumption that incoming powers at receivers follow an i.i.d. distribution. While practical in some scenarios,...
In this paper, we study the performance of wireless adhoc networks (WANETs) that employ rateless error correction codes. We consider a WANET which uses constant power for all transmissions and adapts the pure ALOHA as the channel access protocol. The locations of nodes are modeled by a homogeneous space time Poisson point process with Rayleigh fading. The paper quantifies the rate density and the...
The development of next-generation networks has been driven by a number of use cases aimed at supporting innovative applications and services. Among these drivers the Internet of Things has gained momentum due to its potential to leverage Machine Type Communications (MTC), a term used to denote machine-centered communications among sporadic, bursty traffic generating devices. While scalability issues...
A decoupled association scheme is considered based on instantaneous received power in downlink and uplink. Unlike traditional cellular networks where the associated base stations (BSs) in downlink and uplink are the same, in decoupled association the associated BSs in uplink and downlink can be different. The probability of user associations in co-channel BSs in finite multi-tier networks (with finite...
Cooperative intelligent traffic systems (C-ITS) will help improve the safety and efficiency of ground transportation by enabling the cooperation between traffic participants. Applications based on the C-ITS paradigm rely on vehicle-to-vehicle, vehicle-to-infrastructure, and vehicle-to-device (collectively, V2X) communication for the exchange of critical information and have very stringent Quality...
Mobile networks are experiencing the avalanche of data traffic, which is coupled with the billions of wirelessly connected data-intensive devices using diverse multimedia services and applications. Prospective studies suggest that traffic volume would increase a thousand-fold over the next decade. Furthermore, the users expect the utmost in quality with seamless connectivity to the broadband access...
In this paper, we investigate the performance of a dual-hop amplify-and-forward (AF) relay system with beamforming (BF), where the source and destination are both equipped with multi-antenna, which are correlated in space, while the relay has a single antenna corrupted by multiple co-channel interferences (CCIs). We first derive the closed-form expression for the outage probability (OP) of the output...
Heterogeneous networks (HetNets) have strong interference due to spectrum reuse. This affects the signal-to-interference ratio (SIR) of each user, and hence is one of the limiting factors of network performance. However, in previous works, interference management approaches in HetNets are mainly based on interference level, and thus cannot effectively utilize the limited resource to improve network...
For a general multicell Massive MIMO network, we obtain easily verifiable conditions for the existence of power controls that meet given down-link and up-link per access terminal SINR requirements. Surprisingly, some loosely constructed sufficient conditions that guarantee the existence of power controls become necessary in the single cell case, whose “max-min” SINR problems are then easily solved.
In this paper, we investigate the performance of a wireless sensor network, in which multiple groups of source nodes communicate with their respective destination nodes with the help of a common relay network. A network code division multiplexing (NCDM) scheme is proposed to remove the inter-session interference among multiple transmission sessions at each destination. We focus on analyzing the soft...
In this article, we present a Cloud empowered Cognitive Inter-Cell Interference Coordination (C2-ICIC) scheme for small cellular networks. The scheme leverages a recently proposed cloud radio access network (C-RAN) architecture for enabling intratier coordination and relaxes the need for inter-tier coordination by adopting the phantom cell architecture. Employing tools from stochastic geometry, we...
Recent advancements in the self-interference (SI) cancellation capability of low-power wireless devices pave the way of implementing full-duplex (FD) self-backhauling in smallcell networks. FD self-backhauling allows exploiting the radio spectrum used by the radio access network (RAN) for backhaul links as well as access links concurrently. This paper characterizes the performance of FD self-backhauling...
This paper studies the capacity scaling law of the multi-pair relay network with K source-destination pairs and M relays, where each node is equipped with a single antenna and works in half duplex mode. With the conventional two-slot relaying, the capacity was found to scale as K over 2 log (M)+O(1) for fixed K and M → ∞. This paper shows that the capacity scaling law can be further improved to K...
GPS systems have revolutionized the way people and social networks in society interact. As GPS becomes more ubiquitous in road transportation, energy, or autonomous delivery drones, there is increasing opportunity for adversaries and malicious attackers to exploit GPS infrastructure so as to hijack or damage position-sensitive systems. We propose the development of a precise positioning system that...
This On-demand route discovery mechanism of reactive protocols based on flooding of route request packets faced serious excursion of “broadcast storm”. Moreover, frequent path breakages are experienced due to link failures, as an impact of time varying characteristics of radio channel and/or node mobility. In this paper Channel Quality Adaptive Gossip Flooding mechanism for Ad hoc On-demand Distance...
We consider the problem of maximizing the alphafairness utility over the downlink of a heterogeneous wireless network (HetNet) by jointly optimizing the association of users to transmission points (TPs) and the activation fractions of all TPs. Activation fraction of each TP is the fraction of the frame duration for which it is active, and together these fractions influence the interference seen in...
Pilot reuse in multiple cell Massive MIMO induces coherent inter-cell interference that does not disappear with large numbers of antennas. A simple way to mitigate pilot contamination is to use a pilot reuse factor that is greater than one, which surrounds the home cell by one or more rings of non-contaminating cells. The penalty for this measure is that training consumes an increasing fraction of...
In wireless networks, where each node transmits independently of other nodes in the network (the ALOHA protocol), the expected delay experienced by a packet until it is successfully received at any other node is known to be infinite for the signal-to-interference-plus-noise-ratio (SINR) model with node locations distributed according to a Poisson point process. Consequently, the information velocity,...
This paper addresses the benefits of introducing exclusion regions around both transmitters and receivers in D2D wireless networks. Such exclusion regions offer protection from interference at the expense of a sparser spatial reuse of spectrum, bringing about a tradeoff whose resolution entails optimizing the size of the exclusion regions as function of relevant system parameters. Our figure of merit...
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