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In this paper, we aim to determine the multi-hop route between a Device-to-Device (D2D) source-destination pair that maximizes the end-to-end throughput, under stochastic interference constraints imposed by the cellular network and a target SINR constraint at the destination. We determine the maximum allowed D2D transmit powers from the interference constraints and propose a throughput-optimal routing...
The decoding performance of polar codes strongly depends on the decoding algorithm used, while also the decoder throughput and its latency mainly depend on the decoding algorithm. In this work, we implement the powerful successive cancellation list (SCL) decoder on a GPU and identify the bottlenecks of this algorithm with respect to parallel computing and its difficulties. The inherent serial decoding...
In massive multiple-input multiple-output (MIMO) systems, superimposed (SP) and time-multiplexed (TM) pilots exhibit a complementary behavior, with the former and latter schemes offering a higher throughput in high and low inter-cell interference scenarios, respectively. Based on this observation, in this paper, we propose an algorithm for partitioning users into two disjoint sets comprising users...
The growth of wireless technology made opportunistic scheduling awidespread theme in recent research. Providing high systemthroughput without reducing fairness allocation is becoming a verychallenging task. The purpose of this work is twofold. On the onehand, we proposed a new optimization problem called SatisfactionProbability which consists in maximizing the number of satisfiedusers. On the other...
In wireless networks, providing a high fairness allocation isbecoming a very challenging task. This paper has two objectives:firstly, we proposed a new optimization problem called SatisfactionProbability which consists in maximizing the number of satisfiedusers and secondly, we proposed a new scheduling scheme calledQoE-aware Multi-step Opportunistic (QEMO) scheduler. QEMO is builtin an extended cross-layer...
The current paper deals with application of leaky feeder cables (LFCs) in linear-cells MIMO systems. We first revisit the method whereby we can map the measured channel data to throughput in an LTE system. Later we show that feeding an LFC from its both ends by two independent signals can potentially lead to a promising 2 × 2 MIMO system with a desirable throughput. Our results also interestingly...
Non-orthogonal multiple access (NOMA) has been considered as one of the key technologies to enhance spectral efficiency and the total throughput for the fifth generation (5G) systems. NOMA can be combined with coordinated multi-point (CoMP) transmission to improve the performance of cell edge users. For a network to benefit from CoMP, its utilisation of resources should be scheduled efficiently. This...
In this work, we do an empirical approach to identify 802.11n technology Train to Ground communication specifics in underground applications from an industrial point of view. The equipment for the measurements was located aboard and along a track. The experiments consisted on measuring signal to noise ratio levels and beacon loss along a standard train cycle for physical layer performance assessment...
Multiple overlapping transmissions cause a serious performance degradation in dense wireless local area network (WLAN) due to increased level of interferences. The issue of interference management becomes extremely challenging particularly for IEEE 802.11 b and g standards where the number of non-overlapping channels (NOCs) is only 3. Power control at the access points (APs) plays a major role to...
There have been burning issues on Wireless Body Area Networks (WBANs) in which performance analysis for media access layer (MAC) protocol is essential and has been discussed in many literatures. By using Markov chain model, saturation and non-saturation conditions, many works can calculate access probability and throughput of system. However, previous works usually assumed that channel is ideal and...
A method for off-peak transfer of data, by which user equipment (UE) autonomously shifts a peak load on a base station, is proposed and evaluated. In regard to the proposed method, how UE monitors the load on a base station is a significant problem. To solve this problem, a novel method of passively estimating the resource block (RB) usage rate of a serving cell on the basis of radio conditions measured...
Network efficiency and proper utilization of its resources are essential requirements to operate wireless networks in an optimal fashion. Cognitive radio aims to fulfill these requirements by exploiting artificial intelligence techniques to create an entity called cognitive engine. Cognitive engine exploits awareness about the surrounding radio environment to optimize the use of radio resources and...
This paper proposes an enhanced adaptive control cell range expansion (CRE) technique in heterogeneous networks to increase the system capacity and improve the user throughput. The enhanced adaptive control CRE technique is operated by both the user equipment (UE) connection ratio to pico cells in the macro cell and the received SINR for UEs. The features of the proposed CRE technique are described...
The dual connectivity (DC) can increase the users' throughput in heterogeneous cellular networks (HCNs). Additionally, the coordinated multi-point (CoMP) based transmission/reception can provide higher coverage and throughput in HCNs, specially to edge users in the cell. In this paper, we frame the resource allocation problem for DC as an optimization problem and present the optimal user scheduling...
Base Stations (BSs) in LTE networks face heavy traffic demand from User Equipments (UEs) for voice, online gaming, video calls, file transfers, etc., We consider a LTE Device-to-device (D2D) network where LTE UEs have primary access to the spectrum and D2D pairs have secondary access. In order to offload traffic from BS and to enhance spectral efficiency, operators can activate multiple D2D pairs...
In this paper, the performance of radio frequency energy harvesting system with multiple power-constrained relays over Rician/Rayleigh fading channels is studied. This considered system consists of one power and information source, multiple power-constrained relays and one destination. In order to exploit the diversity advantage of cooperative network with low computational complexity, the relays...
In this paper, we consider two-hop multi-input multi-output (MIMO) relay wireless systems with energy harvesting. In each hop, transmit antenna selection (TAS)/receive antenna selection (RAS), TAS/maximum ratio combining (MRC), or maximum ratio transmission (MRT)/RAS is employed. Also, a relay harvests energy from the source via either a time switching-based relaying protocol (TSR) or a power splittingbased...
With the rapid growth of bandwidth-intensive applications, Carrier Aggregation (CA) has been introduced in Long Term Evolution-Advanced (LTE-A) Networks to provide higher data rates. In this paper, we investigate the joint resource block allocation and link adaptation problem with CA in LTE-A dwonlink. The problem is formulated as an Integer Programming problem aimed at maximizing the cell throughtput...
This work presents relay selection and beamwidth adaptation algorithms for millimeter-wave communication network by selecting best relay. Due to the high path loss, the mm-Wave links suffer from shadowling. Thus improving link availability is a challenge for the system designer. In this work, the link availability is further improved by optimal power allocation and beamwidth adaptation. The channel...
This paper analyzes the performance of information and energy beamforming in multiple-input multiple- output (MIMO) wireless communications systems, where a self-powered multi-antenna hybrid access point (AP) coordinates wireless information and power transfer (WIPT) with an energy-constrained multi-antenna user terminal (UT). The wirelessly powered UT scavenge energy from the hybrid AP radio-frequency...
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