Wi-Fi 802.11n @ 540Mbps - o futuro do wireless?

Chip

Zwame Advisor
Interessante :)

http://www.theregister.co.uk/2004/08/12/802-11n_proposal/

Wi-Fi chip designers Texas Instruments, Broadcom, Conexant, STMicro, Airgo and Bermai have formally told the IEEE what technology they think it should include in the 802.11n standard.

The group has come up with what it believes is a working technology foundation for the putative standard that also manages to fit within the world's numerous local spectrum regulations. They call the proposal 'WWiSE', for WorldWide Spectrum Efficiency.

To that end, the proposal mandates the use of Wi-Fi's 20MHz channel width, which also ensures backwards compatibility with existing Wi-Fi equipment. WWiSE itself uses the Multiple Input, Multiple Output (MIMO) many-antennae technique and Orthogonal Frequency Division Multiplexing (OFDM) to boost data throughput rates to a maximum of 540Mbps.

Such rates can be achieved with a 4 x 4 aerial array and a 40MHz channel width. In countries where spectrum regulations forbid such a channel width, kit based on WWiSE will fall back to a 2 x 2 array and the 20MHz channel width.

The proposal also includes optional advanced forward error-correction coding techniques to boost coverage and range.

The firms behind WWiSE to offer their intellectual property under "reasonable and non-discriminatory terms" - which they have to if the IEEE is to accept its incorporation into a standard - and to do so without charging a royalty fee.

That may not be enough to placate Canadian technology licensing company Wi-LAN, which claims ownership of key OFDM patents and thus a central portion of the 802.11a, 802.11g and WiMAX standards. Wi-LAN's intellectual property has similar implications for WWiSE.

Wi-LAN is aggressively pursuing wireless equipment makers for the royalty payments it believes it's owed. It's attempt to get Cisco to cough up came to nought, and the company has now initiated legal proceedings against the networking giant. Every other Wi-Fi player is eagerly awaiting the outcome of the case, which is likely to focus on the validity of Wi-LAN's patent claim. ®
 
Ainda mais sobre o mesmo assunto :)

http://www.overclockersclub.com/?read=9224228 & http://wireless.com.pt/forum/viewtopic.php?t=5619

Wi-Fi Gets Speed Boost with Pre-802.11n Products
Posted: Wed, 11 Aug 2004 11:38:03 GMT
Author: Matt Cameron


Belkin said on Monday that they'll be releasing a wireless network card and router that uses pre-802.11n multiple-input, multiple-output (MIMO) antenna technology created by Airgo Networks. Belkin said the new pre-n products will provide four times faster speed and coverage area than 802.11b and g products. The new products will also be compatible with older products and in fact will increase performance on those older products.

“Our research shows that, with current wireless technology, people are experiencing poor coverage and performance at farther distances in their homes due to interference from other wireless networks, cordless phones, and other appliances,” explains Eric Tong, VP Marketing and Product Development. “Our Pre-N products with True MIMO will empower users by providing a wireless network that makes poor coverage issues a thing of the past.”






Belkin utilizes True MIMO (Multiple Input Multiple Output) from Airgo Networks in its Pre-N products. True MIMO is the first technology to address the issues of coverage, speed, and interference in larger homes and offices.

True MIMO is a smart-antenna technique that uses multiple antennas to transmit and receive wireless signals. It reaches a step further than other smart-antenna technologies by transmitting multiple signals on each antenna. As a result, Belkin's Pre-N products with True MIMO technology create a robust wireless connection while providing a larger coverage area with the bandwidth and quality of service needed to run advanced applications, such as streaming video or Voice over IP (VoIP).

True MIMO is one of the underlying technologies being considered for 802.11n, a standard in the works for the next generation of Wi-Fi technology.

“True MIMO is a breakthrough technology that fundamentally changes the way radio waves are sent and received. More importantly, True MIMO changes the way consumers are able to use wireless products,” says Greg Raleigh, Chief Executive and President of Airgo Networks. “The immediate performance benefits realized with True MIMO, especially over expanded coverage areas, are why this technology has been chosen to power the upcoming 802.11n high-performance wireless standard. Reliability rivaling that of wired connections and effortless connectivity at real-world distances is why Belkin's True MIMO products have ushered in a new era in wireless.”
 
540 teóricos correcto???

kero ver isso na realidade..no entanto..n deixa de ser uma grande evolução mm comparando ao Turbo G (ou lá como se xama) de 108 Megs (penso eu)
 
Flyer disse:
540 teóricos correcto???

kero ver isso na realidade..no entanto..n deixa de ser uma grande evolução mm comparando ao Turbo G (ou lá como se xama) de 108 Megs (penso eu)

O standard chama-se 802.11g e dá 54mbps.
 
Flyer disse:
Exacto Wi Fi G mas há maneira de por a 108 em vez de 54 :D Turbo G, n é standard mas existe :D

Existe e várias marcas têm isso. Limitam-se a juntar 2 canais. Tem o grande defeito que só funciona entre aparelhos da mesma marca.

E dizem as más línguas que rebentam o resto do espectro em interferências.
 
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