scholarly journals Performance analysis of IEEE 802.11ac based WLAN in wireless communication systems

2019 ◽  
Vol 9 (2) ◽  
pp. 1131 ◽  
Author(s):  
A. Z. Yonis
Keyword(s):  
Communication Systems ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Multiple Input Multiple Output ◽  
Local Area ◽  
Area Network ◽  
Data Rates ◽  
Input Multiple Output ◽  
Ieee 802.11Ac ◽  
5 Ghz

<p><span lang="EN-US">IEEE 802.11ac based wireless local area network (WLAN) is emerging WiFi standard at 5 GHz, it is new gigabit-per-second standard providing premium services. IEEE 802.11ac accomplishes its crude speed increment by pushing on three distinct measurements firstly is more channel holding, expanded from a maximum of 80 MHz up to 160 MHz modes. Secondly, the denser modulation, now using 256-QAM, it has the ability to increase the data rates up to 7 Gbps using an 8×8 multiple input multiple output (MIMO). Finally, it provides high resolution for both narrow and medium bandwidth channels. This work presents a study to improve the performance of IEEE 802.11ac based WLAN system.</span></p>

High isolation and compact MIMO antenna system with defected shorting wall

2014 ◽  
Vol 7 (2) ◽  
pp. 167-172 ◽  
Author(s):  
Xi-Wang Dai ◽  
Long Li ◽  
Zhen-Ye Wang ◽  
Chang-Hong Liang
Keyword(s):  
Wireless Local Area Network ◽  
Local Area Network ◽  
Mimo System ◽  
Multiple Input Multiple Output ◽  
Local Area ◽  
Antenna System ◽  
Area Network ◽  
Mimo Antenna ◽  
High Isolation ◽  
Input Multiple Output

In this paper, a compact multiple-input multiple-output (MIMO) antenna system with high isolation is proposed for 2.4 GHz wireless local area network (WLAN) application. The system is composed of two aperture-coupled shorted patch antennas with a spacing of 4 mm (only 0.032λ). The antenna is fed with an H-shaped coupling slot, and the defected shorting wall is used for high isolation. The proposed MIMO system exhibits an isolation of better than −20 dB and a maximum isolation of −43 dB at the central frequency. The envelope correlation coefficient is less than 0.01. The simulated and measured results show that the proposed antenna is a good candidate for MIMO system with higher isolation and better diversity.

scholarly journals ANALISIS TRANSFER RATE WIRELESS LOCAL AREA NETWORK DENGAN STANDAR IEEE 802.11A DAN IEEE 802.11G PADA KANAL LINE OF SIGHT

2016 ◽  
Vol 3 (1) ◽  
pp. 31-39
Author(s):  
F Ammar ◽  
Hanafi Hanafi
Keyword(s):  
Transfer Rate ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Access Point ◽  
Local Area ◽  
Line Of Sight ◽  
Area Network ◽  
Ieee 802.11A ◽  
5 Ghz

WiFi bekerja pada band 2,4 GHz dan 5 GHz. Standar WiFi yang bekerja pada frekuensi ini antara lain IEEE802.11g dan IEEE802.11a. Pada penelitian ini dilakukan pengukuran terhadap transfer rate download dan upload data dengan standar IEEE802.11g dan IEEE802.11a. Pengukuran dilakukan pada kanal Line of Sight (LOS), menggunakan dua buah laptop yang dihubungkan dengan Access Point (AP) standar IEEE802.11g dan IEEE802.11a.  Hasil penelitian diperoleh, pada standar IEEE802.11g, transfer rate download dan upload data tertinggi 2.662,54.KB/s dan 2.549,60 KB/s, dan terendah 484,50.KB/s dan 477,40 KB/s, sedangkan pada standar IEEE802.11a, transfer rate download dan upload data tertinggi 8.104,68 KB/s dan 5.744,24 KB/s, dan terendah 872,24 KB/s dan 465,38.KB/s. Pada standar IEEE802.11g, transfer rate download dan upload data pada sinyal terendah hingga di bawah 35% dan 30%, dari transfer rate download dan upload data tertinggi. Pada standar IEEE802.11a, transfer rate download dan upload data pada kualitas sinyal terendah hingga di bawah 20% dan 30%, dari transfer rate download dan upload data tertinggi. Kemampuan transfer rate download data Standar IEEE802.11a, 2–3 kali lebih baik pada kondisi kualitas sinyal tertinggi, dan tidak lebih dari 2 kali pada kondisi kualitas sinyal terendah, dibandingkan kemampuan transfer rate download data standar IEEE802.11g. Kemampuan transfer rate upload data Standar IEEE802.11a, 1,4–3 kali lebih baik pada kondisi kualitas sinyal tertinggi, dan 1-3 kali lebih baik pada kondisi kualitas sinyal terendah, dibandingkan kemampuan transfer rate upload data standar IEEE802.11g.

Research on Improvement of the Next Generation IEEE802.11ac Channel Model

2013 ◽  
Vol 712-715 ◽  
pp. 1741-1745
Author(s):  
Hao Cai ◽  
Dan Ao Han
Keyword(s):  
Wireless Local Area Network ◽  
Channel Model ◽  
Local Area Network ◽  
Local Area ◽  
Task Group ◽  
Mimo Channel ◽  
Area Network ◽  
Power Delay Profile ◽  
Ieee 802.11Ac ◽  
Set Up

Based on the special correlation of antennas and the power delay profile (PDP) of the cluster model, six models of A-F have been established by the TGn task-group in total. On the basis of the new broadband wireless local area network (WLAN) standard--IEEE 802.11ac with larger bandwidth and multi-user requirements drawn up by the TGac task-group, in this paper, the IEEE 802.11ac channel model is set up by means of improving and simulating the indoor MIMO channel.

scholarly journals Design of A Dual-Wide Band BPF Utilizing Parallel Coupled Microstrip Lines and A Centered Arrow-Shaped Resonator

2020 ◽  
Vol 23 (2) ◽  
pp. 153-158
Author(s):  
Ahmed Lateef Khudaraham ◽  
Dhirgham Kamal Naji
Keyword(s):  
Communication Systems ◽  
Satellite Communication ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Wide Band ◽  
Local Area ◽  
Area Network ◽  
Band Pass Filter ◽  
Pass Filter ◽  
Strip Lines

This paper presents a dual wide-band band pass filter (DWB-BPF) by using two parallel, symmetrical micro-strip lines loaded by a centered resonator, consisting of a T- and a triangle-shaped geometry, attached at the lower and upper ends, respectively. The filter reveals good performance and both the passbands can be independently controlled by adjusting specific parts of the filter. The proposed BPF is simulated by using CST microwave studio package and the simulated result is verified experimentally with good agreement between the two results.  The fabricated prototype BPF demonstrates two passbands located at 2.3 GHz and 6.35 GHz center frequencies with 39% and 23.6% of 3-dB fractional bandwidth (FBW), respectively and a good insertion and return losses. The designed BPF can be targeted for wireless local area network (WLAN), WIFI and satellite communication systems.

scholarly journals Received Signal Strength Indication (RSSI) of 2.4 GHz and 5 GHz Wireless Local Area Network Systems Projected over Land and Sea for Near-Shore Maritime Robot Operations

2019 ◽  
Vol 7 (9) ◽  
pp. 290 ◽  
Author(s):  
Brennan Yamamoto ◽  
Allison Wong ◽  
Peter Joseph Agcanas ◽  
Kai Jones ◽  
Dominic Gaspar ◽  
...  
Keyword(s):  
Wireless Local Area Network ◽  
Local Area Network ◽  
Path Loss ◽  
Local Area ◽  
Area Network ◽  
Network Systems ◽  
Rf Propagation ◽  
Near Shore ◽  
5 Ghz ◽  
Maritime Environment

The effect of the maritime environment on radio frequency (RF) propagation is not well understood. In this work, we study the propagation of ad hoc 2.4 GHz and 5 GHz wireless local area network systems typically used for near-shore operation of unmanned surface vehicles. In previous work, maritime RF propagation performance is evaluated by collecting RSSI data over water and comparing it against existing propagation models. However, the multivariate effect of the maritime environment on RF propagation means that these single-domain studies cannot distinguish between factors unique to the maritime environment and factors that exist in typical terrestrial RF systems. In this work, we isolate the effect of the maritime environment by collecting RSSI data over land and over seawater at two different frequencies and two different ground station antenna heights with the same physical system in essentially the same location. Results show that our 2.4 GHz, 2 m antenna height system received a 2 to 3 dBm path loss when transitioning from over-land to over-seawater (equivalent to a 25 to 40% reduction in range); but increasing the frequency and antenna height to 5 GHz, 5 m respectively resulted in no meaningful path loss under the same conditions; this reduction in path loss by varying frequency and antenna height has not been demonstrated in previous work. In addition, we studied the change in ground reflectivity coefficient, R , when transitioning from over-land to over-seawater. Results show that R remained relatively constant, −0.49 ≤ R ≤ −0.45, for all of the over-land experiments; however, R demonstrated a frequency dependence during the over-seawater experiments, ranging from −0.39 ≤ R ≤ −0.33 at 2.4 GHz, and −0.51 ≤ R ≤ −0.50 at 5 GHz.

A miniaturized high gain dipole array antenna for 2.4/5 GHz wireless local area network applications

2020 ◽  
Vol 63 (2) ◽  
pp. 550-555
Author(s):  
Ying Liu ◽  
Shuang Liu ◽  
Yongtao Jia ◽  
Zhixing Chen ◽  
Yutao Zhang
Keyword(s):  
Wireless Local Area Network ◽  
Local Area Network ◽  
Local Area ◽  
High Gain ◽  
Array Antenna ◽  
Area Network ◽  
Network Applications ◽  
5 Ghz

The Effectiveness of Wi-Fi-Network Technology on Campuses and Residences for an Improved Learning Experience and Engagement

Mousaion ◽  
2021 ◽  
Vol 39 (1) ◽  
Author(s):  
Kenneth Nwanua Ohei ◽  
Roelien Brink
Keyword(s):  
Higher Education ◽  
Communication Systems ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Local Area ◽  
Easy Access ◽  
Area Network ◽  
Effective Learning ◽  
Information And Communication ◽  
Improved Learning

The information and communication technology revolution is broadly recognised for its fundamental role in the effective operation of higher education institutions. There is a need to understand the way in which wireless local area networks at universities are viewed by registered users, the people that develop, implement and maintain these networks, and those planning on adopting these networks. The study’s objective is to unravel the usefulness of these networks in a higher education environment to promote effective learning engagements at campuses of the University of Johannesburg in South Africa. Universities provide Wi-Fi network initiatives on campuses to create an effective learning environment, and wireless local area network connections at universities mean that Wi-Fi-enabled devices can be leveraged for educational purposes. The provision of Wi-Fi-enabled computers, mobile devices and electronic gadgets has revolutionised the realm and methods of communication, which is channelled towards improving and enhancing internet coverage on campuses and at student residences. This study explores the effectiveness of Wi-Fi networks and hotspots on campuses and at student residences to improve students’ learning engagement. The study used mixed-research methods, including a document analysis to gather information from information and communication systems and a survey to gather responses from the respondents. The findings suggest that Wi-Fi availability at universities is perceived as useful and effective since students benefit from a range of improved learning experiences, easy access to educational content, enhanced performance, and quality and education delivery.

Radio-frequency front-end for 5 GHz wireless local area network transceivers

2008 ◽  
Vol 2 (5) ◽  
pp. 439 ◽  
Author(s):  
A. Italia ◽  
F. Carrara ◽  
A. Scuderi ◽  
E. Ragonese ◽  
C.D. Presti ◽  
...  
Keyword(s):  
Radio Frequency ◽  
Wireless Local Area Network ◽  
Local Area Network ◽  
Local Area ◽  
Area Network ◽  
Front End ◽  
5 Ghz

scholarly journals Experimental Results of Network-Assisted Interference Suppression Scheme Using Adaptive Beam-Tilt Switching

2017 ◽  
Vol 2017 ◽  
pp. 1-10
Author(s):  
Tomoki Murakami ◽  
Riichi Kudo ◽  
Koichi Ishihara ◽  
Masato Mizoguchi ◽  
Naoki Honma
Keyword(s):  
Wireless Local Area Network ◽  
Local Area Network ◽  
Interference Suppression ◽  
Multiple Input Multiple Output ◽  
Local Area ◽  
Experimental Results ◽  
System Throughput ◽  
Area Network ◽  
Network Systems ◽  
Transmit Power

This paper introduces a network-assisted interference suppression scheme using beam-tilt switching per frame for wireless local area network systems and its effectiveness in an actual indoor environment. In the proposed scheme, two access points simultaneously transmit to their own desired station by adjusting angle of beam-tilt including transmit power assisted from network server for the improvement of system throughput. In the conventional researches, it is widely known that beam-tilt is effective for ICI suppression in the outdoor scenario. However, the indoor effectiveness of beam-tilt for ICI suppression has not yet been indicated from the experimental evaluation. Thus, this paper indicates the effectiveness of the proposed scheme by analyzing multiple-input multiple-output channel matrices from experimental measurements in an office environment. The experimental results clearly show that the proposed scheme offers higher system throughput than the conventional scheme using just transmit power control.

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