An emerging solution for prolonging the lifetime of energy constrained relay nodes in wireless networks is to avail ambient radio-frequency (RF) signal and simultaneously harvest process information. In this paper, an amplify-and-forward (AF) relaying network considered, where node harvests from received RF uses that harvested forward source information destination. Based on time switching power splitting receiver architectures, two protocols, namely, i) switching-based (TSR) protocol ii)...

We consider wireless-powered amplify-and-forward and decode-and-forward relaying in cooperative communications, where an energy constrained relay node first harvests through the received radio-frequency signal from source then uses harvested to forward information destination node. propose time-switching based harvesting (EH) transmission (IT) protocols with two modes of EH at relay. For continuous time EH, can be any percentage total block time. discrete whole is either used for or IT. The...

In this paper, we consider a decode-and-forward (DF) relaying network based on wireless energy harvesting. The constrained relay node first harvests through radio-frequency (RF) signals from the source node. Next, uses harvested to forward decoded information destination transfers and two mechanisms, i) time switching-based (TSR) ii) power splitting-based (PSR). Considering harvesting constraint at node, derive exact analytical expressions of achievable throughput ergodic capacity DF for...

Unmanned aerial vehicles (UAVs) can be deployed as flying base stations (BSs) to leverage the strength of line-of-sight connections and effectively support coverage throughput wireless communication. This paper considers a multiuser communication system, in which single-antenna UAV-BS serves large number ground users by employing non-orthogonal multiple access (NOMA). The max-min rate optimization problem is formulated under total power, bandwidth, UAV altitude, antenna beamwidth...

Oscillator phase noise limits the performance of high speed communication systems since it results in time varying channels and rotation signal constellation from symbol to symbol. In this paper, joint estimation channel gains Wiener multi-input multi-output (MIMO) is analyzed. The model for problem outlined detail new expressions Cramér-Rao lower bounds (CRLBs) multi-parameter are derived. A data-aided least-squares (LS) estimator jointly obtaining parameters Next, a decision-directed...

This paper proposes a centralized decision making framework at the macro base station (MBS) for device to (D2D) communication underlaying two-tier cellular network. We consider D2D pair in presence of an MBS and femto access point, each serving user, with quality service constraints all users. Our proposed solution encompasses mode selection (choosing between or reuse dedicated mode), resource allocation (in mode) power control within single framework. The prioritizes if are close other...

Considering a multicell network for the secure wireless information and power transfer, this paper studies joint design of transmit beamformers at base stations (BSs) receive signal splitting ratios end users' equipment (UE). The primary concern in work is internal security, where there may be single multiantenna eavesdropper or risk that any near user accidentally eavesdrop on received far user. objective to maximize minimum secrecy rate under BS UE harvested energy constraints. New...

Timing and carrier synchronization is a fundamental requirement for any wireless communication system to work properly. the process by which receiver node determines correct instants of time at sample incoming signal. Carrier adapts frequency phase its local oscillator with those received In this paper, we survey literature over last five years (2010-2014) present comprehensive review classification recent research progress in achieving timing single-input-single-output (SISO),...

Providing ultra reliable and low-latency communication (URLLC) is considered one of the major challenges for wireless networks. This article considers a downlink URLLC system in which base station (BS) serves multiple single-antenna users short blocklength regime. With objective maximizing users' minimum rate, three different optimization problems are considered: (i) joint design bandwidth power allocation case BS; (ii) beamforming multiple-antenna (iii) with regularized zero-forcing BS. In...

This paper considers a network consisting of multiple antenna array access point serving single downlink users with the assistance reconfigurable intelligent surface (RIS). The reflecting coefficients RIS can be programmed to ensure that signals reflected from elements add coherently at users. joint design these programmable and transmit beamforming maximize users' worst rate is addressed. Under either proper Gaussian signaling (PGS) or improper (IGS), poses very computationally challenging...

This paper considers cell-free massive MIMO (cfm-MIMO) for downlink ultra reliable and low-latency communication (URLLC). At the time of writing, cfm-MIMO has only been considered in long blocklength regime (LBR), whose throughput is determined by Shannon capacity with interference treated as Gaussian noise. Conjugate beamforming (CB) often used it requires local channel state information (CSI) implementation but its design based on a large-scale nonconvex problem, which computationally...

Unmanned air vehicle (UAV) as an aerial base station (ABS) has attracted the attention of cellular service providers to enable emergency communications. However, unplanned multiple ABS deployment poses severe interference challenges that degrade user's performance. To maximize system sum capacity, we propose use <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">K</i> -means and xmlns:xlink="http://www.w3.org/1999/xlink">Q</i> -learning assisted...

Information and energy can be transferred over the same radio-frequency channel. In power-splitting (PS) mode, they are simultaneously transmitted using signal by base station (BS) later separated at user (UE)'s receiver a power splitter. time-switching (TS) either separately in time BS or received UE. this paper, transmit beamformers jointly designed with receive PS ratios TS multicell network that implements wireless information transfer (WIPT). Imposing UE-harvested constraints, design...

This paper considers the efficient design of precoding matrices for sum throughput maximization under quality service (QoS) constraints and energy harvesting (EH) energy-constrained devices in a full-duplex (FD) multicell multi-user multiple-input-multiple-output network. Both time splitting (TS) power are considered to ensure practical EH information decoding. These problems quite complex due non-concave objectives nonconvex constraints. Especially, with TS, which is implementation-wise...

Oscillator phase noise (PHN) and carrier frequency offset (CFO) can adversely impact the performance of orthogonal division multiplexing (OFDM) systems, since they result in inter interference rotation signal constellation. In this paper, we propose an expectation conditional maximization (ECM) based algorithm for joint estimation channel, PHN, CFO OFDM systems. We present model problem derive hybrid Cramer-Rao lower bound (HCRB) problem. Next, iterative receiver on extended Kalman filter...

Considering a multi-user interference network with an eavesdropper, this paper aims at the power allocation to optimize worst secrecy throughput among links or secure energy efficiency in terms of achieved per Joule under link security requirements. Three scenarios for access channel state information are considered: perfect information; partial channels from transmitters eavesdropper exponentially distributed; and not perfectly known between users distributed errors. The develops various...

Improper Gaussian signaling (IGS) helps to improve the throughput of a wireless communication network by taking advantage additional degrees freedom in signal processing at transmitter. This paper exploits IGS general multiuser multi-cell network, which is subject both intra-cell and inter-cell interference. With under orthogonal multiple access (OMA) or non-orthogonal (NOMA), designs transmit beamforming maximize users' minimum power constraints are addressed. Such mathematically formulated...

This letter considers an unmanned aerial vehicle (UAV)-enabled mobile edge computing (MEC) system, where UAV base stations (UBSs) are deployed to cache, process, and deliver virtual reality (VR) content from a cloud server VR users (VRUs). Under Rician fading channel model, we optimize various resource allocation parameters, e.g., association of VRUs with UBSs, caching policy, computing-capacity allocation, location the objective minimizing maximum latency, subject computing, caching, power...

This paper analyzes the performance of multiple reconfigurable intelligent surfaces (RISs)-aided networks with opportunistic RIS scheduling. The also provides some optimization results on number reflecting elements RISs and optimal placement RISs. We first derive accurate closed-form approximations for channels' distributions assuming independent non-identically distributed (i.ni.d.) Nakagami- <italic xmlns:mml="http://www.w3.org/1998/Math/MathML"...

In this letter, we investigate the mobile edge computing framework with unmanned aerial vehicle (UAV) and reconfigurable intelligent surface (RIS) collaboration, in which a dedicated non-orthogonal multiple access (NOMA) based protocol is introduced for task offloading. model, UAV acts as relay node computation server to support ground users offloading tasks remote point assistance of RIS. To explore impact joint RIS design NOMA on performance, sum bits maximization problem formulated by...

Multiple distributed nodes in cooperative networks generally are subject to multiple carrier frequency offsets (MCFOs) and timing (MTOs), which result time varying channels erroneous decoding. This paper seeks develop estimation detection algorithms that enable communications for both decode-and-forward (DF) amplify-and-forward (AF) relaying the presence of MCFOs, MTOs, unknown channel gains. A novel transceiver structure at relays achieving synchronization AF-relaying is proposed. New exact...

Emerging fifth generation (5G) wireless networks require massive bandwidth in higher frequency bands, extreme network densities, and flexibility of supporting multiple technologies order to provide data rates seamless coverage. It is expected that utilization the large millimeter-wave (mmWave) band deployment heterogeneous (HetNets) will help address rate requirements 5G networks. However, high pathloss shadowing mmWave band, strong interference HetNets due densification, coor- dination...

Some next-generation wireless networks will likely involve the energy-efficient transfer of information and energy over same channel. Moreover, densification such make physical layer more vulnerable to cyber attacks by potential multi-antenna eavesdroppers. To address these issues, this paper considers transmit time-switching (TS) mode, in which signals are transmitted separately time base station (BS). This protocol is not only easy implement but also delivers opportunity for multi-purpose...

Nano-devices have great potential to play a vital role in future medical diagnostics and treatment technologies because of its non-invasive nature ability reach delicate body sites easily as compared with conventional devices. In this paper, novel concept cooperative communication for vivo nano-network is presented enhance the among these The effect on system outage probability performance conducted various parameters, including relay placement, number relays, transmit power, bandwidth,...

An energy harvesting (EH) enabled network is capable of delivering to users, who are located sufficiently close the base stations. However, wireless delivery requires much more transmit power than what normal information does. It very challenging provide quality and simultaneously. practical interest employ non-orthogonal multiple access (NOMA) improve throughput, while fulfilling EH requirements. To realize both decoding, this paper considers a time-switching (transmit-TS) protocol. Two...