Friday, February 10, 2012
Wireless & Mobile
Error 404--Not Found |
From RFC 2068 Hypertext Transfer Protocol -- HTTP/1.1:10.4.5 404 Not FoundThe server has not found anything matching the Request-URI. No indication is given of whether the condition is temporary or permanent. If the server does not wish to make this information available to the client, the status code 403 (Forbidden) can be used instead. The 410 (Gone) status code SHOULD be used if the server knows, through some internally configurable mechanism, that an old resource is permanently unavailable and has no forwarding address. |
A MIMO primer
Multiple-input multiple-output (MIMO) wireless uses different waveforms on typically two, but sometimes three or more transmitting antennas inputting to the channel
carrying radio waves from Point A to Point B. Multiple antennas and radios (typically, two or three) also are applied to the
output of the radio channel at the receiver, along with a lot of signal processing, which ideally improves range and throughput
compared with simpler or traditional radio designs operating under similar conditions.
Related links
Wavion to launch MIMO-ready outdoor APs
05/25/06
New MIMO Wi-Fi to outpace Ethernet
09/14/05
MIMO products boost 802.11g nets
03/21/05
M86 Security Labs report provides insight to plan security for 2012
02/10/12
The researchers at M86 Security Labs have just released their semiannual report about security trends and malware, spam and phishing activities they observed in the latter half of 2011. Use the 20/20 hindsight of this report to plan ahead for your security measures in 2012.
Google expands the scope of its vulnerability reward programs to cover Chromium OS
02/10/12
Encouraged by the success of its Web and Chromium vulnerability reward programs, Google has decided to expand their scope in order to cover security issues in Chromium OS as well.
Forget Public Cloud or Private Cloud, It's All About Hyper-Hybrid
02/10/12
Cloud computing has gone from being a promising technology to a reality that brings a unique set of challenges along with benefits. To fully leverage the disruptive potential of cloud without getting trapped in a web of integration complexity, CIOs and their IT organizations need to focus on what it means to rethink their business as a collection of services.
MIMO is sometimes referred to as spatial multiplexing, because it users a third, spatial dimension - beyond frequency and time - as a carrier for information. The multiplicative effect of properly designed MIMO systems can be dramatic: As our tests show, the 100Mbps barrier (application-layer throughput) in wireless LANs has been broken. Indeed, the upcoming 802.11n standard will likely specify raw (physical layer) performance as high as 600Mbps via a 4-by-4 MIMO array.
MIMO is also likely to have an influence on so-called 4G cellular designs, but that's a different story.
Return to MIMO test
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