High-Speed Light Sources in High-Speed Optical Passive Local Area Communication Networks

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
IS Amiri ◽  
Ahmed Nabih Zaki Rashed ◽  
P Yupapin
Keyword(s):  
Communication Networks ◽  
High Speed ◽  
Network Performance ◽  
Optical Filters ◽  
Local Area ◽  
Optical Amplifier ◽  
Error Rates ◽  
Measured Signal ◽  
Light Sources ◽  
Data Rates

AbstractThis study outlines the high-speed light sources in high-speed passive optical local area communication networks. Directly modulated laser measured is selected as a light source for data rate transfer of 40 Gb/s for propagation range up to 20 km. Optical output power after fiber-optic cable is measured. Signal power amplitude, Q-factor, and data error rates after the receive side are also measured. Hybrid optical amplifier, optical filters, and electrical filters are used for upgrading the network performance operation efficiency. The study assured that the optical communication network can be extended to 20 km distance with data rates of 40 Gb/s with achieving maximum Q-factor of 14.98 and minimum data rates of 3.55 ×10–51.

An Ultrawideband Microfabricated Gold-Based Antenna Array for Terahertz Communications

2020 ◽  
Author(s):  
Abdoalbaset Abohmra ◽  
Hasan Abbas ◽  
Jalil Kazim ◽  
Muhammad Rabbani ◽  
Chong Li ◽  
...  
Keyword(s):  
Communication Networks ◽  
Energy Efficient ◽  
High Speed ◽  
Coplanar Waveguide ◽  
Microwave Frequency ◽  
Future Generation ◽  
Data Rates ◽  
Terahertz Communications ◽  
High Bandwidth ◽  
The Cost

Abstract The microwave frequency band typically used for wireless communications will soon become saturated and will no longer be able to fulfil the high bandwidth demands of modern communication networks. Terahertz (THz) communication has appeared as a highly attractive, future-generation wireless technology that offers higher spectral bandwidth and, therefore, higher data rates. However, the full exploitation of THz technologies is contingent upon the availability of energy-efficient sources and devices. In this article, we presented a fabrication and measurement of microscale planar inverted cone antenna (PICA) array made of gold. Using an ungrounded coplanar waveguide feed, the microfabricated structure provides a bandwidth of 37.9 % with the resonant frequency of 0.925 THz. Given the cost of microfabrication is reducing substantially with rapid technological advancements, the results of this paper suggest that high-speed THz communications can be realised for widescale applications.

MIPS and BIPS are Megaflops: Limits of Unidimensional Assessments

1989 ◽  
Vol 33 (10) ◽  
pp. 597-601
Author(s):  
William W. Banks ◽  
Michael Pihlman
Keyword(s):  
Network Performance ◽  
Local Area Network ◽  
Local Area ◽  
Performance Measure ◽  
Error Rates ◽  
Small Sample ◽  
Area Network ◽  
Sample Sizes ◽  
Network Systems ◽  
Two Systems

We believe that a failure to incorporate human performance measures into system test protocols will result in imprecise and incomplete data when attempting to estimate field test performance from a total systems perspective. Traditional methods of evaluating local area network performance generally refer to the network's throughput, time delays, data rate (BIPS), or media access protocol efficiency. These measures are quite acceptable when determining point-to-point benchmark network performance but do not take into account the more global man-machine performance issues associated with people using network systems to perform tasks and execute functions concurrently within a “total systems” context. This paper experimentally compares differences in human productivity/efficiency while using: 1) an existing data gathering system consisting of several geographically distributed, unconnected, and disparate mainframes; and 2) a prototype Intelligent Gateway (Local Area Network) connecting mainframes and offering the user less complexify in procedure execution and an easy to use interface. Tests were conducted with volunteer users in a repeated measures experimental design. Each test subject was randomly assigned to each of two conditions and required to execute routine tasks with each of two systems. ANOVA results revealed significant differences in task completion times and human error rates between the two systems. An increase in human productivity/efficiency was observed using the gateway LAN. We propose to extend the traditional computer performance measurement (monitoring) boundaries, which now encompass only the network hardware, to include an overall “input-to-output” local area network performance measure, combining both measures of user productivity and network performance. A discussion of trade-offs between unidimensional assessment methods using large sample sizes and multiple methods with small sample sizes is also presented. We further believe that without the addition of specific behavioral measures, MIPS and BIPS are truly Megaflops.

An Effective Adaptive Autocorrelation-Based Neighboring Matching Location-Aware Computing in WLANs

2011 ◽  
Vol 204-210 ◽  
pp. 2011-2014
Author(s):  
Yu Bin Xu ◽  
Mu Zhou ◽  
Lin Ma
Keyword(s):  
High Speed ◽  
Wireless Local Area Network ◽  
Nearest Neighbor ◽  
Local Area Network ◽  
Local Area ◽  
Measured Signal ◽  
Area Network ◽  
K Nearest Neighbor ◽  
Context Aware Computing ◽  
High Efficient

The recent advances of ubiquitous wireless infrastructures and requirements for high speed context-aware computing have created the opportunities to supply the high efficient location based service (LBS) in indoor wireless local area network (WLAN) environment. Because of the serious multi-path effect, unpredictable co-channel interference and inherent equipment noise, the measured signal strengths vary a lot in the real-world indoor environment. And this strength variation will also result in the performance deterioration of radio map-based neighboring matching algorithm. In response to this compelling problem, we propose the adoption of adaptive autocorrelation-based signal preprocessing method as a specific solution by effectively eliminating the singular strength from the original fingerprint set. Finally, the feasibility and effectiveness of autocorrelation-based preprocessing are also verified by decreasing about 33.4% and 32.9% of errors in k nearest neighbor (KNN) and weighted KNN (WKNN).

scholarly journals Performance evaluation of wireless local area network with congested fading channels

2022 ◽  
Vol 12 (1) ◽  
pp. 411
Author(s):  
Chanintorn Jittawiriyanukoon ◽  
Vilasinee Srisarkun
Keyword(s):  
Wireless Communication ◽  
Fading Channels ◽  
Communication Networks ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Multipath Fading ◽  
Local Area ◽  
Propagation Delay ◽  
Error Rates ◽  
Area Network

The IEEE 802.11ay wireless communication standard consents gadgets to link in the spectrum of millimeter wave (mm-Wave) 60 Giga Hertz band through 100 Gbps bandwidth. The development of promising high bandwidth in communication networks is a must as QoS, throughput and error rates of bandwidth-intensive applications like merged reality (MR), artificial intelligence (AI) related apps or wireless communication boggling exceed the extent of the chronic 802.11 standard established in 2012. Thus, the IEEE 802.11ay task group committee has newly amended recent physical (PHY) and medium access control (MAC) blueprints to guarantee a technical achievement especially in link delay on multipath fading channels (MPFC). However, due to the congestion of super bandwidth intensive apps such as IoT and big data, we propose to diversify a propagation delay to practical extension. This article then focuses on a real-world situation and how the IEEE 802.11ay design is affected by the performance of mm-Wave propagation. In specific, we randomize the unstable MPFC link capacity by taking the divergence of congested network parameters into account. The efficiency of congested MPFC-based wireless network is simulated and confirmed by advancements described in the standard.

Design of high-speed 10-Gb/s wired/FSO systems for local area communication networks for maximum reach

2019 ◽  
Vol 38 (2) ◽  
pp. 206-218
Author(s):  
A. R. Palanisamy ◽  
G. M. Tamilselvan ◽  
A. Pushparaghavan
Keyword(s):  
Communication Networks ◽  
High Speed ◽  
Local Area

scholarly journals 300 GHz Optoelectronic Transmitter Combining Integrated Photonics and Electronic Multipliers for Wireless Communication

Photonics ◽  
2019 ◽  
Vol 6 (2) ◽  
pp. 35 ◽  
Author(s):  
Muhsin Ali ◽  
Jose Manuel Pérez-Escudero ◽  
Robinson-Cruzoe Guzmán-Martínez ◽  
Mu-Chieh Lo ◽  
Iñigo Ederra ◽  
...  
Keyword(s):  
Communication Networks ◽  
High Speed ◽  
Local Oscillator ◽  
Frequency Multiplier ◽  
Laser Source ◽  
Wireless Data ◽  
Data Rates ◽  
Power Handling Capability ◽  
Electronic Frequency ◽  
Thz Power

THz communications systems at carrier frequencies above 200 GHz are the key to enable next-generation mobile communication networks with 100 Gbit/s wireless data rates. One of the key questions is, which carrier frequency generation technique will be the most suitable. This is currently addressed by two separate approaches, electronics-based and photonics-based. We present in this paper a truly microwave photonic approach that benefits from the main key features of each, bandwidth, tunability, stability and fiber compatibility from photonics and power handling capability from the electronics. It is based on a Photonic Local Oscillator (PLO), generating a 100 GHz frequency, fed into an electronic frequency multiplier. A high speed uni-travelling carrier photodiode (UTC-PD) provides the 100 GHz PLO for Schottky tripler diodes, generating 300 GHz signal. To feed the UTC-PD, we present a photonic integrated mode locked laser source. According to the simulations and measurements, the developed transmitter can produce a maximum of 12 μW of THz power at 280 GHz.

scholarly journals Measuring and Assessing Performance of Mobile Broadband Networks and Future 5G Trends

2022 ◽  
Vol 14 (2) ◽  
pp. 829
Author(s):  
Ayman A. El-Saleh ◽  
Abdulraqeb Alhammadi ◽  
Ibraheem Shayea ◽  
Nizar Alsharif ◽  
Nouf M. Alzahrani ◽  
...  
Keyword(s):  
User Satisfaction ◽  
High Speed ◽  
Network Performance ◽  
Performance Metrics ◽  
Mobile Network ◽  
Fourth Generation ◽  
Mobile Broadband ◽  
Fifth Generation ◽  
Data Rates ◽  
Suburban Cities

Mobile broadband (MBB) is one of the critical goals in fifth-generation (5G) networks due to rising data demand. MBB provides very high-speed internet access with seamless connections. Existing MBB, including third-generation (3G) and fourth-generation (4G) networks, also requires monitoring to ensure good network performance. Thus, performing analysis of existing MBB assists mobile network operators (MNOs) in further improving their MBB networks’ capabilities to meet user satisfaction. In this paper, we analyzed and evaluated the multidimensional performance of existing MBB in Oman. Drive test measurements were carried out in four urban and suburban cities: Muscat, Ibra, Sur and Bahla. This study aimed to analyze and understand the MBB performance, but it did not benchmark the performance of MNOs. The data measurements were collected through drive tests from two MNOs supporting 3G and 4G technologies: Omantel and Ooredoo. Several performance metrics were measured during the drive tests, such as signal quality, throughput (downlink and unlink), ping and handover. The measurement results demonstrate that 4G technologies were the dominant networks in most of the tested cities during the drive test. The average downlink and uplink data rates were 18 Mbps and 13 Mbps, respectively, whereas the average ping and pong loss were 53 ms and 0.9, respectively, for all MNOs.

scholarly journals On the evaluation of the IEEE 802.11ac WLAN performance with QoS deployment

2021 ◽  
Vol 24 (3) ◽  
pp. 1618
Author(s):  
Ziyad Khalaf Farej ◽  
Omer Mohammed Ali
Keyword(s):  
System Performance ◽  
High Speed ◽  
Network Performance ◽  
Local Area ◽  
Data Rate ◽  
Medium Access ◽  
Node Number ◽  
High Speed Data ◽  
Ieee 802.11Ac ◽  
The Impact

The increase in the number of users on wireless local area networks (WLAN) and the development of large size applications have increased the demand for high-speed data rate and low latency. The IEEE 802.11ac was developed to provide very high throughput WLANs. Many enhancements are added to the medium access control (MAC) and physical (PHY) layers to increase data rate and improve network performance, these features enable the IEEE 802.11ac standard to provide quality of service (QoS) for multimedia applications. This paper concentrates on the impact of QoS on the system performance in term of delay and throughput. Four scenarios are proposed to investigate the network performance with different (from 1 up to 8) spatial stream (SS). The objective modular network testbed in C++ (OMNet++ modeler v5.5.1) is used to simulate and model these scenarios. For 8×8 SS, the results of simulation show the best throughput (maximum) and delay (minimum) values of (622, 484, 399.3, 382.96 Mbps) and (0.0211, 0.0589, 0.1037, 0.1202 sec) for 5, 15, 30 and 45 node number scenarios respectively. Although the number of nodes increases, the system performance decreases, however when QoS is deployed the performance is enhanced and its best improvement is obtained at the highest (45) node number scenario with values of 94.4% and 56.1% for throughput and delay respectively.

Gigabit Ethernet Implementation

2008 ◽  
pp. 2308-2324
Author(s):  
Nurul I. Sarkar ◽  
Catherine Byrne ◽  
Nabeel A.Y. Al-Qirim
Keyword(s):  
High Speed ◽  
Network Performance ◽  
Web Applications ◽  
Performance Testing ◽  
Local Area ◽  
Gigabit Ethernet ◽  
High Bandwidth ◽  
Ethernet Networks ◽  
Ethernet Technology

Although Ethernet technology is still the most popular LAN technology in use today at the desktop, the throughput offered by the 10 and 100 Mbps Ethernet is inadequate for high bandwidth networking applications such as real-time visualisation, high-resolution graphics, multimedia and Web applications. Gigabit Ethernet (GigE) technology provides 1,000 megabits per second (i.e., one gigabit per second) at more reasonable cost than the other technologies of comparable speed and therefore it is a natural upgrade strategy for many legacy Ethernet networks. This paper reports on a case study of a large New Zealand organization focusing on the level of GigE deployment, design, planning and implementation, network performance testing, problems encountered and future plans. Our findings show the feasibility and practicability of deploying GigE technology in high-speed networking applications such as campus- and corporate-wide local area networks.

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