Research Article
A Novel 5G Multi-mode Resonator and Filter with Symmetric Transmission Zeros
Bing Luo*
,
Qian-Qian Li
Issue:
Volume 11, Issue 2, December 2024
Pages:
19-30
Received:
30 July 2024
Accepted:
21 August 2024
Published:
6 September 2024
Abstract: 5G construction is becoming increasingly important. This paper introduces the theoretical basis of multi-mode filter, and on the basis of theoretical calculation and analysis, a novel 5G cavity multi-mode resonator and filter is designed by using ads/HFSS simulation software. The electric field characteristic of resonator is analyzed, and the mutual coupling between modes is realized by the way of screw perturbation. The electric field distributions of the mode is changed by adding tuning screws, two coupled degenerate modes act as two coupled resonators, so that the numbers of resonator can be reduced while keeping the resonance loop unchanged. For example, the characteristics of 3N section filter can be realized in the physical space of a traditional n-section filter by using three modes of a resonator, thus greatly reducing the volume of the filter. The results show that in the pass-band (3.5 GHz ~ 3.6 GHz): return loss > 17.9 dB, standing wave ratio < 1.29, insertion loss < 0.31 dB, a transmission zero point is introduced at 4 GHz on the right side of the pass-band, which makes the right side out of band attenuation rapidly. The filter has the advantages of small insertion loss, small size and good rejection of out of band, which can be applied to 5G band wireless communication system for better reliability.
Abstract: 5G construction is becoming increasingly important. This paper introduces the theoretical basis of multi-mode filter, and on the basis of theoretical calculation and analysis, a novel 5G cavity multi-mode resonator and filter is designed by using ads/HFSS simulation software. The electric field characteristic of resonator is analyzed, and the mutua...
Show More
Review Article
Review of Channel Measurements and Modeling for Successful 5G System Deployments
Issue:
Volume 11, Issue 2, December 2024
Pages:
31-38
Received:
5 August 2024
Accepted:
27 August 2024
Published:
20 September 2024
Abstract: The deployment of 5G wireless networks has enabled the investigation of numerous potential applications across a variety of sectors. To enhance the efficiency of 5G systems, it is imperative to have a thorough understanding of millimeter-wave wireless channels, different multi-access techniques, massive MIMO technologies, beamforming, modulation, and coding. Adjusting the channel modeling approach to accommodate specific characteristics of the deployment site, such as geographical obstructions like hills, tunnels, road infrastructure, and mountains, may prove to be crucial. This review paper delves into the challenges associated with channel modeling, underscoring the importance of multipath components and the diverse measurement techniques required for enhancing 5G communication. Additionally, it delves into the complexities of accurately depicting the behavior of wireless channels in various scenarios and assesses the key factors that could significantly affect the functionality of 5G networks across different environments. For instance, it becomes clear that indoor channels provide a greater impediment than outdoor channels because barriers such as walls, furniture, and human activities can impede signal transmission and interrupt communication. Indoor channels display complex characteristics that include fluctuations in the angles at which signals arrive, transmission of numerous signals over different paths, and a wide range of scattering qualities that are specific to indoor environments. Hence, it is crucial to modify the measurement procedures to correspond to the unique characteristics of indoor channels. Indoor wireless communication relies on channels available both within and outside the structure. Evaluation aspects such as, macroscopic fading, microscopic fading, and shadow fading are critical because these elements have a significant impact on the channel capacity.
Abstract: The deployment of 5G wireless networks has enabled the investigation of numerous potential applications across a variety of sectors. To enhance the efficiency of 5G systems, it is imperative to have a thorough understanding of millimeter-wave wireless channels, different multi-access techniques, massive MIMO technologies, beamforming, modulation, a...
Show More
Research Article
Load-Aware and Priority Adaptive Traffic Congestion Control Method in Vehicular Ad Hoc Network
Ermias Melku Tadesse*,
Samuel Asferaw Demliw,
Ayene Zinabie,
Alemu Desu Geto,
Nuru Endris
Issue:
Volume 11, Issue 2, December 2024
Pages:
39-51
Received:
8 September 2024
Accepted:
6 October 2024
Published:
7 December 2024
Abstract: Vehicular ad hoc networks (VANET) are a subset of mobile ad hoc networks communicating between vehicles and infrastructure. During vehicular congestion communication, nodes compete to acquire channels, causing the channels to become congested. The congestion on the vehicle network results in increased delay and packet loss, resulting in reduced VANET performance. To address this problem, we developed a load-aware and priority adaptive traffic congestion control method in vehicular ad hoc networks (VANETs). The proposed scheme identifies less-congested road segments based on the network's load and reduces traffic congestion by suggesting other routes between nearby roadside units (RSUs). This research aims to improve the efficiency of the vehicular environment by utilizing the movement of vehicles with (RSUs) and sharing the traffic load between them. Simulation results demonstrate the effectiveness of the proposed protocol in reducing congestion and enhancing the overall performance of VANETs. To validate the proposed algorithm, we have implemented and tested the proposed algorithm using Network Simulator 3 (NS3) for Vehicle-to-Vehicle (V2V) and Vehicle-to-Infrastructure (V2I) communication scenarios and computed the performance of the algorithm on different parameters of the network. The simulation result of the proposed load aware and priority adaptive traffic congestion control method in VANET improved the packet delivery ratio, packet lost ratio, and end-to-end delay by 96%, 4.1%, and 1102 milliseconds, when compared to TDCCA value of 92%, 5.7%, and 1154 milliseconds, respectively.
Abstract: Vehicular ad hoc networks (VANET) are a subset of mobile ad hoc networks communicating between vehicles and infrastructure. During vehicular congestion communication, nodes compete to acquire channels, causing the channels to become congested. The congestion on the vehicle network results in increased delay and packet loss, resulting in reduced VAN...
Show More
