In this paper, we provide the theoretical framework for performance comparison of reconfigurable intelligent surfaces (RISs) and amplify-and-forward (AF) relaying wireless systems. particular, after statistically characterizing end-to-end (e2e) channel coefficient RIS-assisted system, in terms probability density function (PDF) cumulative (CDF), extract novel closed-form expressions instantaneous average e2e signal-to-noise ratio (SNR) both AF-relaying Building upon these expressions, derive...

This article discusses the basic system architecture for THz wireless links with bandwidths of more than 50 GHz into optical networks. New design principles and breakthrough technologies are required in order to demonstrate terabit- per-second data rates at near zero latency using proposed concept. Specifically, we present concept designing baseband signal processing both an E2E error correction approach combined link. We provide two possible electro-optical interface architectures, namely...

This paper is focused on providing the analytical framework for quantification and evaluation of joint effect misalignment fading hardware imperfections in presence multipath at terahertz (THz) wireless fiber extenders. In this context, we present appropriate system model that incorporates different operation, design, environmental parameters. more detail, it takes into account transceivers antenna gains, operation frequency, distance between transmitter (TX) receiver (RX), conditions, i.e.,...

The adaptation of smart antenna techniques in future wireless systems is expected to have a significant impact on the efficient use spectrum, minimization cost establishing new networks, optimization service quality, and realization transparent operation across multitechnology networks. Nevertheless, its success relies two considerations that been often overlooked when investigating technologies: first, antennas features need be considered early design phase (top-down compatibility); second,...

Machine-to-machine (M2M) communications over cellular networks pose significant challenges as a result of the large number devices, small data transmissions, and vast applications range. Current solutions based on general packet radio service (GPRS) access proved to be inadequate for supporting M2M ecosystem. Therefore, advanced network releases, such long-term evolution (LTE) LTE-Advanced (LTE-A), should efficiently cater communications. However, increase in signaling overhead diverse...

The extreme traffic load that future wireless networks are expected to accommodate requires a rethinking of the system design. initial estimations indicate that, unlike evolutionary path previous cellular generations was based on spectral efficiency improvements, most substantial amount performance gains will be obtained by means network infrastructure densification. By increasing density operator-deployed elements along with incorporation user-deployed access nodes (ANs) and mobile user...

Abstract As the wireless world moves towards sixth generation (6G) era, demand of supporting bandwidth-hungry applications in ultra-dense deployments becomes more and imperative. Driven by this requirement, both research development communities have turned their attention into terahertz (THz) band, where than $$20\,{\text {GHz}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mn>20</mml:mn><mml:mspace/><mml:mtext>GHz</mml:mtext></mml:mrow></mml:math> contiguous...

This work discusses the optimal reconfigurable intelligent surface placement in highly-directional millimeter wave links. In particular, we present a novel system model that takes into account relationship between transmission beam footprint at RIS plane and size. Subsequently, based on derive end-to-end expression of received signal power and, furthermore, provide approximate closed-form expressions case size is either much smaller or least equal to footprint. Moreover, building upon...

Cellular systems are expected to play a fundamental role in the future Machine-to-Machine (M2M) networks, which could inherit crucial benefits from former, such as ubiquitous coverage and global internetworking. However, unique features of M2M communications, larger number connected devices diversity applications, require specific enhancements these cellular systems. Because nature most large uplink transmissions is expected, rendering scheduling an essential issue towards supporting...

In this paper, we provide a novel distance and frequency dependent adaptive modulation scheme, which is suitable for communication systems operating in the terahertz (THz) band. After determining transmission bandwidth, proposed scheme evaluates subcarrier bandwidth of orthogonal division modulated (OFDM) signal, order to countermeasure selectivity THz channel. Next, power allocated OFDM subcarriers quadrature (QAM) symbol loaded each selected, based on instantaneous channel conditions...

In this letter, we introduce a novel mixed terahertz (THz)-radio frequency (RF) wireless system architecture, which can be used for backhaul/fronthaul applications, and deliver the theoretical framework its performance assessment. more detail, after identifying main design parameters characteristics, derive closed-form expressions end-to-end signal-to-noise ratio cumulative density function, outage probability symbol error rate, assuming that experiences joint effect of fading stochastic...

In the present work, we investigate impact of transceiver hardware imperfection on reconfigurable intelligent surface (RIS)-assisted wireless systems. this direction, first, a general model that accommodates transmitter (TX) and receiver (RX) radio frequency impairments. Next, derive novel closed-form expressions for instantaneous end-to-end signal-to-noise-plus-distortion-ratio (SNDR). Building upon these expressions, extract an exact expression system's outage probability, which allows us...

This work aims to present the theoretical framework for outage performance assessment of joint impact antenna misalignment and local oscillator (LO) phase noise (PHN) on terahertz (THz) wireless systems. In more detail, a closed form expression probability tight high signal ratio (SNR) approximation were extracted. Our results reveal detrimental PHN importance taking them into consideration when analyzing THz Furthermore, it was observed that LO hardware impairments is significant system...

This paper presents a connectivity analysis of reconfigurable intelligent surface (RIS) assisted terahertz (THz) wireless systems. Specifically, system model that accommodates the particularities THz band links as well characteristics RIS is reported, accompanied by novel general end-to-end (e2e) channel attenuation formula. Based on this formula, we derive closed-form expression returns optimal phase shifting each reflection unit (RU) RIS. Moreover, provide tractable e2e coefficient...

Reconfigurable intelligent surfaces (RISs) empowered high-frequency wireless systems are expected to become the supporting pillar for several reliability and data rate hungry applications. Such are, however, sensitive misalignment atmospheric phenomena including turbulence. Most of existing studies on performance assessment RIS-empowered ignore impact aforementioned phenomena. Motivated by this, current contribution presents a theoretical framework statistically characterizing cascaded...

ABSTRACT Supporting emerging machine‐to‐machine (M2M) communications over Long‐term Evolution (LTE)/LTE Advanced cellular networks in an efficient way will be beneficial for both telecommunication communities. The first step to migrate M2M‐enabled standard is provide these new services through the existing architectures and protocols, while maintaining seamless backward compatibility. To this end, we thoroughly examined a key LTE Medium Access Control entity, which packet scheduler, proposed...

In this paper, we establish an appropriate system model for the terahertz (THz) wireless links in range of 275 to 400 GHz, which accommodates channel particularities and transceivers parameters. The former includes frequency selectivity, pathloss, as well atmospheric conditions, namely temperature pressure, whereas latter are assumed be consisted antenna gains power allocation transmitted signal. Moreover, present analytical expressions low computational complexity, evaluation average SNR,...

This paper presents the analytic framework for evaluating ergodic capacity (EC) of reconfigurable intelligent surface (RIS) assisted systems. Moreover, high-signal-to-noise-ratio and high-number reflection units (RUs) approximations EC are provided. Finally, special case in which RIS is equipped with a single RU investigated. Our analysis verified through respective Monte Carlo simulations, highlight accuracy proposed framework.

Sustaining a flexible and ubiquitously available high-data-rate (high-DR) network that is capable of supporting massive number end users demands the exploitation higher-frequency bands, such as terahertz band (0.1–10 THz). However, utilization wireless systems comes with challenges, many them associated very high propagation losses signals, which require high-gain directional antennas strict beam alignment requirements well low signal penetration (sub)millimeter waves, leads to intermittent...

In this paper, we analyze the performance of a reconfigurable intelligent surface (RIS)-assisted unmanned aerial vehicle (UAV) wireless system that is affected by mixture-gamma small-scale fading, stochastic disorientation and misalignment, as well transceivers hardware imperfections. First, statistically characterize end-to-end channel for both cases, i.e., in absence presence extracting closed-form formulas probability density function (PDF) cumulative distribution (CDF). Building on...

Providing LTE connectivity to emerging Machine-to-Machine (M2M) applications imposes several challenges the operation and optimization of current future 3GPP mobile broadband standard releases. Scheduling in an efficient way M2M traffic over existing MAC infrastructure is decisive for smooth evolution towards M2M-enabled system. The large number connecting devices compared classical terminals, their vastly diverse quality-of-service requirements, call design new packet scheduling schemes...

In this paper, we formulate a novel throughput aware user association scheme for ultra dense terahertz (THz) networks. more detail, introduce problem, which takes into account the THz channel particularities, directivity of BSs' and UEs' antennas, as well their position minimum rate requirements. Moreover, provide solution framework, is based on grey wolf optimizer (GWO) returns optimal table. Finally, present comparative simulation results, validate superiority proposed framework against...

The present white paper focuses on the system requirements of TERRANOVA. Initially details key use cases for TERRANOVA technology and presents description network architecture. In more detail, are classified into two categories, namely backhaul & fronthaul access small cell backhaul. first category refers to fibre extender, point-to-point redundancy applications, whereas latter is designed support backup connection medium-sized enterprises (SMEs), internet things (IoT) dense environments,...