LTE V2X is the response of 3GPP standardization body to high market expectations related vehicular communications for safety and infotainment services. To fulfill stringent requirements in terms reliability associated with applications, geolocation-based access (GLOC) has been proposed direct vehicle-to-vehicle (V2V) communication. Such a scheme aims at maximizing distance co-channel transmitters (i.e., transmitter that use same resources) while preserving low latency when accessing...

Millimeter-wave communications have been recently proposed as a promising candidate to fulfill the connectivity requisites imposed over autonomous driving. The need for transmission capabilities of multiple gigabits per second vehicles is main driving factor millimeter-wave technology. However, there are other paramount requirements, such short delays, high reliability, security, and support both unicast broadcast communications, which must be carefully addressed before this technology...

Inter-cell interference is one of the main limiting factors in current Heterogeneous Cellular Networks (HCNs). Uplink Fractional Power Control (FPC) a well known method that aims to cope with such factor as save battery live. In order do that, path losses associated Mobile Terminal (MT) transmissions are partially compensated so lower leaked towards neighboring cells. Classical FPC techniques only consider set parameters depends on own MT transmission, like desired received power at Base...

The physical layer security of uplink non-orthogonal multiple access (NOMA) is analyzed. A stochastic geometry approach applied to analyze the coverage probability and effective secrecy throughput (EST) kth NOMA user, where a fixed or an adaptive transmission rate can be used. We consider protected zone around legitimate terminals establish eavesdropper-exclusion area. assume that channel state information associated with eavesdroppers not available at base station. also station equipped...

We analyze the impact of arbitrary dependence between forward and backward links in backscatter communication systems. Specifically, we quantify effect positive negative these fading on channel capacity by using Copula theory. The benefits this approach are highlighted over classical framework linear based Pearson's correlation coefficient, which is also analyzed. Results show that for a fixed transmit power budget, grows with as well severity low signal-to-noise ratio (SNR) regime....

In this paper, a novel non-orthogonal multiple access (NOMA)-enabled framework for cloud-radio networks (CRANs) is proposed. framework, two users are scheduled in the same resources according to NOMA; however performance of cell-edge enhanced by means coordinating beamforming. Stochastic geometry invoked modeling proposed where positions BSs follow cluster point process. an effort characterize simple expressions terms outage probability derived both nearby and users. It analytically...

Global System for Mobile Communications Railways (GSM-R) has been the de facto standard wireless communications in field of High Speed Railway (HSR). However due to increasing requirements associated with HSR, Long Term Evolution (LTE-R) presented as following communication system. In this paper a complete performance analysis LTE HSR is carried out giving results both Physical (PHY) and Medium Access Control (MAC) layer order identify appropriate Quality Service (QoS) requirements. An...

Summary Evaluation of complex wireless systems through simulations is commonly tackled with an abstraction physical link behavior. This procedure performed in 2 phases: Firstly, training at the level, resulting a mapping function from signal‐to‐interference‐plus‐noise ratio (SINR) to block error rate (BLER); and secondly, layer signal processing replaced by link‐level function. Several methods have been proposed literature for abstraction. The well‐known exponential effective SINR (EESM)...

We analyze the coverage probability of multi-user uplink cellular networks with fractional power control. use a stochastic geometry approach where mobile users are distributed as Poisson Point Process (PPP), whereas serving base station (BS) is placed at origin. Using conditional thinning, we able to calculate $k$ which allocated set orthogonal resources in cell interest, obtaining analytical expressions for this considering their respective distances BS. These give useful insights on...

In this paper we investigate the application of free space optical (FSO) communications, energy harvesting, and unmanned aerial vehicles (UAVs) as key technology enablers a cost-efficient backhaul/fronthaul framework for 5G beyond (5G+) networks. This novel approach is motivated by several facts. First, UAVs, acting relay nodes, represent an easy-to-deploy adaptive network that can provide line-of-sight between base stations gateways connected to core network. Second, FSO communications...

In this letter, we present two mechanisms based on soft-output Viterbi algorithm (SOVA) technique that achieve a performance close to maximum a-posteriori (MAP) decoding.First, propose new called alternating direction SOVA, which allows for improving the of SOVA in similar terms as bidirectional while barely affecting area complexity.Then, introduce idea parallel turbo decoding path metric/state border exchange.Unlike other techniques, overlapping between adjacent subblocks is not required,...

With the speeding up of fifth generation (5G) new radio (NR) worldwide commercialization, one paramount questions for operators and vendors is how to optimize links, considering widely diverse scenarios envisioned. One key pillars 5G has been an unprecedented flexibility on configuration access network (RAN) that include cellular, vehicular, industrial networks among others. This its main exponent link adaptation (LA), which evolved into a multi-domain technique where plethora parameters,...

Hyper-Dense Heterogeneous (HDH) deployments, which are made of different kinds Base Stations (BSs), constitute a promising solution to meet the high data rates envisioned for 5G cellular systems. However, presence such large number BSs, each is expected deliver amount end-users, pushing bottleneck networks from Radio Access Network (RAN) backhaul, becoming as critical radio infrastructure. Hence, new network topologies and architectures under debate, whose objective overcome backhaul cost...

In this paper, we propose a novel deep reinforcement learning (DRL) framework to maximize user fairness in terms of delay. To end, devise new version the modified largest weighted delay first (M-LWDF) algorithm, called <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"><tex-math notation="LaTeX">$\beta$</tex-math></inline-formula> -M-LWDF, aiming fulfill an appropriate balance between and average This is defined as feasible region on...

One of the challenges direct vehicle-to-vehicle (V2V) communication is to find efficient radio resource management (RRM) strategies that can fulfil requirements even with high traffic density. In cellular networks, a device-to-device (D2D) usually split into two phases: discovery process, for node awareness each other; and phase itself, where data exchange takes place. case V2V, utilize status information cars broadcast periodically as beacons detect presence neighbouring cars. For delivery...

A low-complexity pilot pattern and a frequency-domain channel estimation method for Inter-Carrier Interference (ICI) mitigation is proposed Orthogonal Frequency Division Multiple Access (OFDM) systems. The exploits the band structure of coupling matrix to perform an ICI-free in frequency domain. This relies on some conditions imposed over that simplify complexity significantly, since its same as classical least squares (LS) used low mobility scenarios. Then, ICI removed by using modified...

In this work, it is studied the performance of a scheduling algorithm where Mobile Terminals (MTs) may be turned off if they cause level interference greater than given threshold. This approach, which referred to as Interference Aware Muting (IAM), regarded an interference-aware scheme that aimed reduce interference. The IAM in terms transmit power, coverage probability, Spectral Efficiency (SE), and Binary Rate (BR). Simplified expressions SE BR for adaptive modulation coding schemes are...

Turbo codes are extensively used in wireless communication systems and have been adopted as the channel coding scheme for next generation cellular standards. The complexity associated with decoding process is an important issue. In this paper, we propose adaptive Soft Output Viterbi Algorithm (adSOVA) based turbo decoder which proved to reduce without experiencing a degradation error correction performance. proposed adSOVA evaluated long term evolution (LTE) downlink scenario compared SOVA...

One of the key ingredients Intelligent Transportation Systems (ITS) is delivery broadcast status messages among vehicles for safety purposes. This requires an efficient Medium Access Control (MAC) that provides low average delay and high reliability. To this end, Carrier Sense Multiple (CSMA) has been commonly proposed Vehicle Ad Hoc Networks (VANETs). Nevertheless, hidden- node problem can jeopardize reliability CSMA, whereas latency when accessing channel be unbounded. overcome these...