International Journal of Ultra Wideband Communications and Systems
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International Journal of Ultra Wideband Communications and Systems (5 papers in press)
Preconditioning Conjugate-Gradient Based LAS Detection for Massive MIMO Systems by Mitesh Solanki, Shilpi Gupta Abstract: In massive multiple-input multiple-output (MIMO) wireless systems, the computational load of data detection increases along with the increasing number of antennas. The neighbourhood search algorithms achieve near-optimal performance and these are derived from an inversion of large-dimensional matrices. Recently, linear iterative solvers, such as Conjugate-Gradient (CG) have been introduced to address this issue. It motivates the design of a less complex data detection algorithm that is proficient in achieving near-optimal performance in an unconstrained ML space. Preconditioned Conjugate-Gradient is an approach towards further enhancement of the performance. This article proposes the computationally efficient preconditioned Conjugate-Gradient based Likelihood Ascent Search (PCGLAS) detector. PCGLAS detection algorithm achieves a fast update vector within unconstrained ML space in conjugate descent direction with few iterations. Simulation results demonstrate that the proposed algorithm can exert more influence rather than other recent state-of-the-art detection algorithms that achieve promising performance with superior running time efficiency. Keywords: Massive MIMO; Preconditioned Conjugate-Gradient; Unconstrained Maximum-Likelihood; Likelihood ascent search.
Reconfigurable Sub-6 GHz 5G User-terminal MIMO antenna integrated with ISM 2.4 GHz band by Varsha Rani Lad, Jayendra Kumar, Kshama V. Kulhalli Abstract: In this paper, a 2-element, the 2-mode reconfigurable multiple-input-multiple-output antenna is reported. The antenna is designed for the 5G 3.5 GHz and ISM 2.45 GHz integrated services. The antenna radiators are meander-line inspired and investigated for different configurations onboard to ensure self-isolation. The switching is realized using a single pin diode based active circuit. The prototype of the antenna exhibits good impedance matching better than -10 dB, a reasonable gain of 1.2 dBi in ISM 2.4 GHz and 1.8 dBi in 3.5 5G bands and co and cross-polarization isolation of above -15 dB. The optimized position and orientation of the two antenna elements exhibit excellent self-isolation of 27.6 dB ensuring better MIMO performance parameters with better coverage. The matching between simulation and measurement results are appreciable. Keywords: 5G; Meander-line; MIMO Antenna; Reconfigurable Antenna; User Terminal Antenna;.
A Comprehensive Review of Ultra-Wideband (UWB) Antennas for 5G Applications by Md. Zulfiker Mahmud, Ashik Jiddiney, Mahbubur Rahman, Md. Samsuzzaman, Ayman A. Althuwayb, Mohammad Tariqul Islam Abstract: Globally, the wireless communication technology is expanding quickly due-to-the increasing number of wireless devices. About 20 billion devices have connected to the internet in the end of 2020. Due to the limitations of current 1G, 2G, 3G and 4G LTE technologies researchers are provoked to some alternative solutions which can connect billions of devices with higher facilities like smart cities, virtual reality, e-healthcare, and different types of real time communications. This paper presents an extensive review on concept and techniques of ultra wideband (UWB) antennas for the fifth generation (5G) communication and its recent uses in wireless communications leading to higher performance. Fifth generation antennas are capable of connecting 1 million devices per-square kilometre, transmitting high speed data up to 2 GBps, and latency less than 10ms. The goal of this article is to provide microwave researchers an in depth information on 5G antenna technologies and its recent developments. Keywords: Fifth generation (5G); UWB; Wireless Communication; High Speed Communication. DOI: 10.1504/IJUWBCS.2021.10046338
Design of Dual Band Pass Filter with Two end-to-ends T shaped Resonator and Open ended stubs for Wireless LAN Applications by Anirban Neogi, Jyoti Ranjan Panda Abstract: A compact dual-band band-pass filter using two-end-to-end T-shaped resonator with two symmetrical vertical open-ended stubs and Defective Ground Surface (DGS) is proposed in this article. The proposed filter resonates at 2.41 and 5.52 GHz, which are suitable for application in Wireless Local Area Network (WLAN). In addition, mathematical analysis for the equivalent circuit analysis is presented. The proposed dual-band band-pass filter provides 3dB Fractional Band Width of 16.97% & 11.16%, Return Loss ('RL') of 20 dB & 24 dB and Insertion Loss ('IL') of 0.82 dB & 0.81 dB respectively at resonance frequencies. The simulation of the proposed filter is done with HFSS13 and to validate the simulation, a prototype is fabricated whose optimized and miniaturized size is found to be (24.7 x 16) mm2. Keywords: Dual Band Pass Filter; T-shaped resonator; Vertical Open ended Stub; Transmission Zero; Equivalent Circuit; Defective ground Surface (DGS).
Special Issue on: Next Generation Solutions for Information Centric Networks
Energy Efficient Deployment of Multiple UAV Mounted Base Stations: A Machine Learning Based Approach by Dilip Mandloi, Rohit Sharma, Rajeev Arya Abstract: This paper presents an energy efficient approach for the deployment of multiple 5G enabled unmanned aerial vehicle-mounted base stations (UmBSs) in the area where existing network infrastructure has got demolished due to a natural disaster. In our proposed approach, Kmeans, a Machine Learning based technique, is used to position UmBSs based upon which their transmit power is optimized by solving a convex optimization problem under the constraints of maximum transmit power of UmBS, maximum height of UmBS, and channel capacity. To ensure the QoS requirements, the association of UEs and UmBS is subjected to the constraint of minimum Signal to Interference plus Noise Ratio (SINR) threshold. The effectiveness of the proposed approach is demonstrated in terms of average SINR, average channel capacity, and the number of users served. The performance of the proposed approach is compared with the two baseline approaches through MATLAB simulations Keywords: 5G enabled UmBS; Machine Learning; transmit power optimization; SINR based user association.