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This paper shows the secrecy performance of a network in which secure two-way communication is possible via two half duplex decode and forward (DF) relays with an eavesdropper (EAV) trying to decode the message. In the absence of direct link from source one (S1) to source two (S2), two-way communication is established in two time phases with the help of two half duplex DF relays, first one is in broadcast...
Data transmission capacity of ad-hoc wireless networks could be increased by using multi-path transmission and minimising mutual interference between nodes. This approach could also be used to extend D2D communication opportunities in 5G. The objective of this paper is theoretical analysis and computer simulation to reveal the best conditions for combining smart antennas and multi-path transmission...
One of the promising enhanced features introduced in LTE-Advanced is relaying. Coverage extensions as well as enhanced throughput gain are attractive from the perspective of network operators. While functioning in the macro-overlaid network, relay offers the flexibility of random deployment (nomadic relay) at places where the communication link is congested due to an occasional event (e.g. festival)...
A novel transceiver antenna selection (TRAS) strategy selecting a pair of antennas for transmission and reception at terminal sources for full-duplex (FD) amplify-forward (AF) multi-input multi-output (MIMO) two way relay networks is offered and analyzed. Antenna pair is selected in accordance with maximum and second maximum signal to selfinterference-plus-noise ratio (SINR) between the sources and...
This paper considers a frequency-division-duplexing (FDD) massive multiple-input multiple-output (MIMO) system that operates with two-stage beamforming based on user grouping. In this system, we propose a first stage beamformer and a user grouping method for the two-stage beamforming. The proposed first stage beamformer maximizes an approximate sum rate calculated from the second-order statistic of...
With the increment in users' data demand and the emergence of applications with stringent Quality of Service requirements, important improvements in cellular network architecture need to be made. In this paper we explore the symbiosis of three key communication technologies in 5G: Device-to-Device communications, 60 GHz unlicensed band transmissions and adaptive beamforming techniques. It provides...
The main objective of this paper is to develop an efficient satellite digital beam-forming (BF) method that can provide user specific desirable signal-to-interference-plus-noise ratio (SINR) or data rate for each user in each zone. And a massive multiple-input multiple-output (MIMO) communications system model and its favorable channel propagation condition are assumed (i.e., channel independence...
In this paper, the non-regenerative relay assisted non-orthogonal multiple access (NOMA) system is proposed to enlarge the cellular coverage area and to enhance the system performance. To investigate the proposed system's performance, the closed-form expressions in terms of the system capacity are derived. In an effort to evaluate the performance of the proposed system model, the comparison between...
With the development of wireless transmission technology, the coexistence of a variety of network protocols is inevitable in industrial control networks for a certain period of time. Due to the lack of a necessary coordination mechanism between different network protocols, this may impact the transmission performance of the backhaul network connecting several subnetworks with different protocols when...
This paper presents numerical simulation results to evaluate the interference effect from maritime ESIM to 5G mobile service using 28GHz frequency band. An interference scenario considering the real deployment are established and the Minimum Coupling Loss method is used. From the numerical results, we confirm that the separate distance need to guarantee 5G service quality for outdoor environments...
With the combination of device-to-device (D2D) communication and millimeter wave (mmWave) technology, the density of communication devices increases greatly and the communication environment becomes more complicated. A key challenge in such networks is interference, which is not only from main lobe, but also from the sidelobe power accumulation. However, the approaches for resource allocation in traditional...
This paper provides an tractable analysis of the downlink spectral efficiency of multi-cell multi-user distributed antenna systems (DASs) using stochastic geometry with maximal ratio transmission (MRT) and zero-forcing (ZF) beamforming. Firstly, based on the properties of Gamma variable, the distributions of signal and interference power can be obtained. Then by modeling remote antenna units (RAUs)...
In this paper, a variable step size LMS algorithm was introduced to eliminate the coupling interference of torpedo active electromagnetic fuze system. The variable step size will increase or decrease according to the residual error, which can achieve a faster convergence rate, a smaller steady-state error and a better adaptability to the signal-to-interference ratio (SIR) than the fixed step size...
Reduced-complexity implementations are critical for massive MIMO (Multiple Input, Multiple Output) systems. In this paper we consider the uplink of broadband massive MIMO systems employing SC-FDE (Single-Carrier with Frequency-Domain Equalization) schemes, where multiple users transmit to a single base station with a large number of antennas. We propose low-complexity frequency-domain detection schemes...
In this work, we present the design of a novel large load-controlled multiple-active multiple-passive (LC-MAMP) antenna array that operates at 19.25 GHz. In addition, we describe a method that enables us to perform robust, low-complexity, arbitrary channel-dependent precoding with such arrays as well as a communication protocol that limits the computational complexity associated with beam tracking...
We consider a multi-user (MU) multiple-input-single-output (MISO) downlink system with M single-antenna users and N transmit antennas with a nonlinear power amplifier (PA) at each antenna. Instead of emitting constant envelope (CE) signals from the antennas to have highly power efficient PAs, we relax the CE constraint and allow the transmit signals to have instantaneous power less than or equal to...
In this work, we propose a beam selection scheme that exploits the geometric sparsity of the multi-user (MU) massive multiple input and multiple output (MIMO) channel, using its beamspace representation. Assuming knowledge of the beamspace channel, the beamspace precoder consists in selecting and weighting the beams steered to the users, in order to maximize the signal-to-interference-and-noise ratio...
This paper presents two algorithms for optimizing the transmit and receive antenna selection matrices in Multiple Input Multiple Output (MIMO) Device-to-Device (D2D) communications. MIMO antenna selection technique is well-suited for D2D communications since it is relevant to low-cost devices with less Radio Frequency (RF) chains than antennas, and requires low feedback. The proposed algorithms determine...
Wireless powered communications is a promising technology for next-generation low-powered sensor networks such as the Internet of Things. This paper deals with backscatter communications in sensor networks, an ideal technology for low-powered battery-less devices. However, in contrast to conventional communications, backscattering suffers from collisions due to multiple concurrent transmissions and...
In this paper, energy efficient transmit antenna selection in underlay cognitive radio (CR) multiple-input multiple-output (MIMO) systems from a cross layer perspective, is investigated. Conventional energy efficient antenna selection optimizes an energy efficiency (EE) metric defined in terms of the system capacity and energy consumption, making it a physical layer criterion. In this work, we propose...
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