The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
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...
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...
Coordinated multipoint transmission (CoMP) and soft frequency reuse (SFR) are two popular techniques used to control the deleterious effects caused by inter-cell interference in current 4G and envisaged 5G cellular networks. The performance of the combination of CoMP and SFR has been shown to be strongly influenced by the specific choice of the parameters governing the action of both mechanisms. Unfortunately,...
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...
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...
This paper considers the use of massive multiple input, multiple output (MIMO) combined with single-carrier with frequency-domain equalization (SC-FDE) modulations using a precoding approach. Although millimeter wave (mm-Wave) communications are expected to be a key part of 5G, these frequencies present considerable challenges due to high propagation free-space path losses and implementation difficulties...
In this paper we extend the analysis of the performance of a non-coherent large-scale single input multiple output (LS-SIMO) uplink system based on M-DPSK to consider Rician-K fading channel conditions. The interference is analyzed for a generalized k—factor and we provide analytical expressions of the signal to interference plus noise ratio (SINR) for a single user. We demonstrate that for Rician...
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...
Noncoherent multi-user detection schemes in combination with subspace projection were shown to be an attractive approach in multi-user massive MIMO systems. Up to now, the subspace projection has been performed via a singular value decomposition (SVD) of the receive matrix and nulling the non-signal dimensions. In this paper, we employ an alternative approach to the subspace estimation step, namely...
Ambient backscatter is a promising solution for future Internet of Things (IoT) composed of massive low-power wireless devices without external power sources. It is challenging to accommodate these devices with high throughput and long range because of the low efficiency inherent in ambient backscatter. To tackle the challenging issue, we propose an optimum modulation and coding scheme (MCS) for ambient...
Polarization division multiple access (PDMA) is a method to simultaneously transmit two independent signals by using vertical and horizontal polarization in the same frequency band. In PDMA systems, the received signal can experience significant interference from cross-polarized signals if the transmit and receive antennas are misaligned in terms of polarization state. In this paper, a precoding technique...
This paper proposes a novel beam aggregation scheme for millimeter wave (mm-Wave) system under hybrid beamforming architecture, assuming one user equipment (UE) equipped with multiple antenna panels receives distinct beams from multiple transmission points (TPs) simultaneously. Further, system framework including channel state information (CSI) feedback scheme and scheduling algorithm is investigated...
In this paper we describe a system for measuring the amplitude and spectrum of reflections from small-size UAVs. Experimental results of amplitude and spectrum electromagnetic wave scattered by small UAV with RCS since 0.01 m2 are presented. Made direct measurements in an anechoic chamber at frequency of 9 GHz. Effectiveness of the parasitic leakage suppression technique at small RCS measurements...
Cellular deployments in the spectrum-rich mm-wave bands are anticipated to provide multi-Gbps connectivity in future 5G networks. Although measurements have demonstrated the feasibility of outdoor mm-wave links, the network-level opportunities and challenges of mm-wave cellular deployments are yet to be fully understood. In this paper we present a study of mm-wave urban network coverage and robustness...
This paper studies the impact of the Doppler effect on the capacity of an uplink communication between one or several user(s) with mobility and a base station. The OFDM and the FBMC/OQAM modulations are investigated. Moreover, massive MIMO techniques are used at the receiver side to increase the SINR and to allow for simultaneous multiuser communications. An analytic study is carried out to highlight...
To overcome the severe path loss and provide higher spectral efficiency for 60 GHz wireless communications, highly directional antennas, which indicate high antenna gains, are widely employed. In this work, we focus on the trade-off between the beamwidth of directional antennas and the interference produced by random concurrent transmissions, in terms of two important statistics, i.e., the expectation...
In ambient backscatter communications (Am-BC), a backscatter device can harvest power from ambient RF signals and modulate its information symbols over the ambient carriers without using complex RF transmitter. Conventional receiver design for AmBC focuses on tackling the direct link interference from the RF source. In this paper, a novel receiver, which is called cooperative receiver, is proposed...
Massive MIMO technology can increase capacity, data rate, and link reliability significantly without additional bandwidth or transmission power. Most of the previous study on Massive MIMO systems are using low frequency (2.6 GHz). This frequency is not suitable for future broadband technology, because IoT devices will use high frequency and possible cell coverage would be smaller. This work proposes...
This paper investigates the feasibility of a radio access system with a self-backhauling access node under full-duplex and half-duplex operation modes. In particular, after making certain simplifying assumptions, closed-form solutions for the feasibility conditions of such a radio access system are derived for both of the considered operation modes. Furthermore, the analysis incorporates given quality...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.