Yusuf’s blog supplemental

This article has a step-by-step howto for setting up Mac OS X on a PC, will give it a tr when I have some time. Involves some BIOS fiddling so not for the feint hearted I guess.

Attending a lecture titled: ‘Imagineering in Wonderland, a Nuclear world around us, are Electrons really blue?’ by Dr Kelvin Kemm.”

Learned a few things:

• South Africa was one of the 1st Nuclear countries because of our Uranium resources.
• Palindaba is going to deplete it’s uranium from weapons grade to 19.5% fuel grade.
• Global warming is just another one of those “keep control by instilling fear” tactics, i.e. bird flu has had its turn.
• Refreshed my interest in the Quantum nature of electrons and Heisenburgs uncertainty principle. Quantum electron pairs will choose opposite spins instantaneously, even though separated by space.

Questions in my head:

• What happens if an electro-magnetic waves’ frequency is increased to a point that it approaches infinity?
• Can an electro-magnetic wave fold in on itself? Would this result in a particle?

Yep, the voip wave cometh!

The ultimate camo

Not sure if this idea has been investigated by any1 else. Imagine is you could weave a suit out of optical fibers in such a way that the end point of one fiber is always 180 degrees to the other end and both are perpendicular to the surface of your body! the effect would be that light from any direction would be sent “through” you/the fibers and emerge at the opposite side, making you invisible!

Idea is copyright ofcourse, contact me for rights

Although I prefer eating to cooking, I have dabbled. I came accross a cooking site that makes the though a lot more comfortable: Cooking For Engineers. Theres also an interesting article on Saturated Fats, Cholesterol, and Heart Disease. My conclusions, stop the Potato Chips (Hydrogenated Oils), replace marg with good ol’ butter and everything in moderation (I love relativity).

found some designs online

Its amazing how a simple idea like the cantenna has grabbed the attention of the media. So far I’ve been interviewed on SABC Africa and by Engineering News (Tin-can bridge to digital society). One would have thought that the technical, innovative stuff we’re doing with ad-hoc networking in the larger project would have more interest. I suppose that its easier to grasp the imagination with simplicity.

IWS2005 Thursday
Keynote speech
WLAN, Fixed Wireless and Cellular all have adopted space-time transmit diversity
Only WLAN’s really use special MUX
Celullar may never see special MUX

Cognitive radio may present a challenge to spatial MUX in WiMAX
MIMO in networks is different from MIMO in isolation

Networks not prepared to cut down on power(loose channels) to include spatial diversity

UWB panel discussion
CSEM – built small, low complexity UWB solution
Low data rate
Tx 3.5 mW
Rx 7.5 mW
Radiated power 100uW
Uses analogue spread spectrum and multi-path diversity
Use of other MAC layer may reduce power further, WiseMAC, S-MAC

CAPANINA Project
Delivering Broadband from a high altitude, quasi stationary plane/airship
120Mb/s symmetric links
Delivery to rural areas, blocks of flats and moving train, using steerable antennae
Optical links for backhaul 48/47GHz 31/28GHz
University of York UK, NICT Japan
60Km diameter user area coverage, single or multiple cell
Possible backhaul via satellite
802.16, 802.20, 802.11 , ETSI Hiperaccess, hiperMAN, DVB
802.16sc is best overall choice
WiMAX, possible depending on regulators
17 – 22 Km above the ground
Dish sizes less than 30 cm
Issues: HAP station keeping and moving train
Antennae: mechatronic and smart
Use 8X8antenna array to block out interfering signals

Test system in Sweden delivered 4Mb/s throughput 802.11b and 1.25Gb/s freespace optic link
Dr. David Grace dg@ohm.york.ac.uk
www.capanina.org
200-300 000 euros for test tethered platform

This has given me an idea!!! Why not put an AP on an advertisement gas balloon as a hop between Jhb and PTA?

Improved Triangulation Method using a Movement model
Localisation done in Bluetooth
Inquiry procedure provides RSSI
Movement model variables: Speed, direction based on previous measurements
Without prior knowledge: Speed truncated normal distribution with a mean of 1m/s and std dev of 0.5m/s
Direction uniform between -180 and 180
With prior knowledge, previous measurements used to determine speed

Planning of Large-scale WLAN infrastructures, Methodius University, Macedonia
Planning either done using educated guesses or with auto planning
Dominant path approach used for propagation modelling
Propogation Modelling, Coverage optimisation and channel alloc optimisation
Wireless Indoor Design Tool, version 1 (WIDT v1) to be released soon
Possible use in indoor mesh?