Hiperlan/2 and IEEE 802.11a—Two novel standards for high speed wireless multimedia networking in the 5 GHz band

2001 ◽  
Vol 118 (5) ◽  
pp. 246-252 ◽  
Author(s):  
M. Huemer
Keyword(s):  
High Speed ◽  
Wireless Multimedia ◽  
Ieee 802.11A ◽  
Multimedia Networking ◽  
5 Ghz

scholarly journals Passive Switched Capacitor RF Front Ends for Spectrum Sensing in Cognitive Radios

2014 ◽  
Vol 2014 ◽  
pp. 1-20
Author(s):  
Bodhisatwa Sadhu ◽  
Martin Sturm ◽  
Brian M. Sadler ◽  
Ramesh Harjani
Keyword(s):  
Spectrum Sensing ◽  
Circuit Design ◽  
Software Defined Radio ◽  
High Speed ◽  
Cognitive Radios ◽  
Optimization Techniques ◽  
Switched Capacitor ◽  
Rf Receiver ◽  
Front End ◽  
5 Ghz

This paper explores passive switched capacitor based RF receiver front ends for spectrum sensing. Wideband spectrum sensors remain the most challenging block in the software defined radio hardware design. The use of passive switched capacitors provides a very low power signal conditioning front end that enables parallel digitization and software control and cognitive capabilities in the digital domain. In this paper, existing architectures are reviewed followed by a discussion of high speed passive switched capacitor designs. A passive analog FFT front end design is presented as an example analog conditioning circuit. Design methodology, modeling, and optimization techniques are outlined. Measurements are presented demonstrating a 5 GHz broadband front end that consumes only 4 mW power.

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.

A 5-GHz CMOS transceiver for IEEE 802.11a wireless LAN systems

2002 ◽  
Vol 37 (12) ◽  
pp. 1688-1694 ◽  
Author(s):  
M. Zargari ◽  
D.K. Su ◽  
C.P. Yue ◽  
S. Rabii ◽  
D. Weber ◽  
...  
Keyword(s):  
Wireless Lan ◽  
Ieee 802.11A ◽  
5 Ghz

scholarly journals Low-Complexity Hardware Interleaver/Deinterleaver for IEEE 802.11a/g/n WLAN

VLSI Design ◽  
2012 ◽  
Vol 2012 ◽  
pp. 1-7
Author(s):  
Zhen-dong Zhang ◽  
Bin Wu ◽  
Yu-mei Zhou ◽  
Xin Zhang
Keyword(s):  
High Speed ◽  
Critical Path ◽  
Low Complexity ◽  
Cmos Technology ◽  
Path Delay ◽  
Hardware Complexity ◽  
Ieee 802.11A ◽  
Comparison Results ◽  
Mathematical Formulas ◽  
High Flexibility

A high-speed low-complexity hardware interleaver/deinterleaver is presented. It supports all 77 802.11n high-throughput (HT) modulation and coding schemes (MCSs) with short and long guard intervals and the 8 non-HT MCSs defined in 802.11a/g. The paper proposes a design methodology that distributes the three permutations of an interleaver to both write address and read address. The methodology not only reduces the critical path delay but also facilitates the address generation. In addition, the complex mathematical formulas are replaced with optimized hardware structures in which hardware intensive dividers and multipliers are avoided. Using 0.13 um CMOS technology, the cell area of the proposed interleaver/deinterleaver is 0.07 mm2, and the synthesized maximal working frequency is 400 MHz. Comparison results show that it outperforms the three other similar works with respect to hardware complexity and max frequency while maintaining high flexibility.

scholarly journals Enhanced ablation efficiency for silicon by femtosecond laser microprocessing with GHz bursts in MHz bursts (BiBurst)

2021 ◽  
Author(s):  
Francesc Caballero-Lucas ◽  
Kotaro Obata ◽  
Koji Sugioka
Keyword(s):  
Laser Ablation ◽  
Repetition Rate ◽  
High Speed ◽  
Single Pulse ◽  
Pulse Mode ◽  
Heat Diffusion ◽  
Ablation Efficiency ◽  
Mode Laser ◽  
Multiple Pulses ◽  
5 Ghz

Abstract Ultrashort laser pulses confine material processing to the laser-irradiated area by suppressing heat diffusion, resulting in precise ablation in diverse materials. However, challenges occur when high speed material removal and higher ablation efficiencies are required. Ultrafast burst mode laser ablation has been proposed as a successful method to overcome these limitations. Following this approach, we studied the influence of combining GHz bursts in MHz bursts, known as BiBurst mode, on ablation efficiency of silicon. BiBurst mode used in this study consists of multiple bursts happening at a repetition rate of 64 MHz, each of which contains multiple pulses with a repetition rate of 5 GHz. The obtained results show differences between BiBurst mode and conventional single pulse mode laser ablation, with a remarkable increase in ablation efficiency for the BiBurst mode, which under optimal conditions can ablate a volume 4.5 times larger than the single pulse mode ablation when delivering the same total energy in the process.

Sign in / Sign up

Export Citation Format

Share Document