A very good article about OFDM and OFDMA :

3G and 4G Wireless Blog: OFDM and OFDMA: The Difference.

Related posts:

1. ScribeFire – a Semi Desktop blog client

Related posts brought to you by Yet Another Related Posts Plugin.

Years ago we could listen to part of the concert from its poster in Sci-Fi Movies, and now it is really possible. Smart posters are equipped with a tag to provide a wide range of information such as audio, video, phone number, contact information, map or simply text.

Suppose you find a smart poster advertising a new mall somewhere, you can either find the address in bottom of the map or just close your phone to read the address, a small map and a picture of the building even a contact phone. Cool! now we know all we need to get to the mall.
To surprise the seller can offer a discount coupon to those who has read the tag.

To get the idea watch the video showing the function (not by me):

Related posts:

1. Near Field Communication, What is NFC?

Related posts brought to you by Yet Another Related Posts Plugin.

I found out that there is something called Z-Wave from Zensys, which claims is much better than ZigBee due to its operating frequencies which are at 900 and 800 bands, hence it is isolated from WiFi band (no more potential disturbance.)

According to Zensys:

Z-Wave technology dramatically extends the possibilities of today’s home security systems.  Z-Wave lets cameras, sensors and other security components work in concert as a unified system, communicating with each other and with the user whether locally or remotely. A Z-Wave home alert system can also communicate with an outside monitoring agency.

–source Simulation of IEEE 802.15.4/ZigBee with Network Simulator-2 (ns-2) – ZigBee Tutorial.

Related posts:

1. NS2 ,ZigBee and WPAN « Udin Harun

Related posts brought to you by Yet Another Related Posts Plugin.

After lots of googling I got this useful blog with lots of must-to-have links for NS2, ZigBee and most of the tools to do the simulation.

We are going to have a course project for network simulation on WPAN and ZigBee and these rare resources are very handy to start with.

NS2 for IEEE 802.15.4/ZigBee LR-WPANs :

1. Simulation of IEEE 802.15./ZigBee With NS-2
2. IEEE 802.15.4 Mac Implementation in NS-2
3. Low Rate Wireless Personal Area Networks (LR-WPANs) NS-2 Platform
4. Simulative Investigation of ZigBee/802.15.4Zigbee/IEEE 802.15.4
   
5. Module for NS2 simulator : http://www.cs.uwm.edu/~mukul/wpan.html

NS « Udin Harun

Related posts:

1. Z-Wave and Zensys

Related posts brought to you by Yet Another Related Posts Plugin.

E-payment or e-wallet which is actually implemented as m-wallet is the biggest shot of NFC. Use of m-wallet in e-ticketing is replacing the current payment method such as mobile (SMS, web based) payment or using traditional plastic card. New generations of contactless Mastercard (paypass) or Visa (paywave) cards are available in market for customers. Currently operators are offering mobile payment with NFC-enabled mobile phones. According to reports by 2010 NFC phones are able to replace all kind of payment card or mobile based payment systems.

[NFC Congress, NFC Mobile Payments. [PDF Document] Hagenberg, Austria : TELEFÓNICA CZECH REPUBLIC a.s., 2009]

Related posts:

1. Near Field Communication, What is NFC?
2. Nearfield.org : A research project on NFC

Related posts brought to you by Yet Another Related Posts Plugin.

Nearness from timo on Vimeo.

Related posts:

1. NFC Field : how it looks like in real world

Related posts brought to you by Yet Another Related Posts Plugin.

Near field communication is a short range (<20cm) wireless communication system designed for mobile phones or other mobile devices supporting up to 424kbps of data rate.

It uses the same proximity technology of RFID working in 13.5MHz. Although standardization of NFC is still in progress, many applications are proposed to use it, mostly focused on e-payment, and e-wallet. Wide range of applications are being tested in the pilot projects all around the world, such as medical services, e-ticket in public transport system, e-payments, patient information card, e-wallet and public collectable information (such as posters or bus stop information). Despite the variety of applications the security and authentication problems are not easy to solve, so many researches are being done to find new solutions. In this paper we discuss NFC technology, applications and some issue regarding the implementation of the NFC enabled systems.

http://pointers.audiovideoweb.com/stcasx/il83win10145/inside_contactless_256k.wmv/play.asx

A video done by Nokia to show different applications of NFC.

Related posts:

1. Nearfield.org : A research project on NFC
2. E-payment and m-Wallet
3. NFC Field : how it looks like in real world

Related posts brought to you by Yet Another Related Posts Plugin.

About

Touch is a research project that investigates Near Field Communication (NFC), a technology that enables connections between mobile phones and physical things. We are developing applications and services that enable people to interact with everyday objects and situations through their mobile devices. More…

Related posts:

1. Near Field Communication, What is NFC?
2. E-payment and m-Wallet
3. NFC Field : how it looks like in real world

Related posts brought to you by Yet Another Related Posts Plugin.

This video is about exploring the spatial qualities of RFID, visualised through an RFID probe, long exposure photography and animation. It features Timo Arnall of the Touch project and Jack Schulze of BERG.I

–Immaterials: the ghost in the field

Immaterials: the ghost in the field from timo on Vimeo.

Related posts:

1. NFC domino?
2. Near Field Communication, What is NFC?
3. Nearfield.org : A research project on NFC

Related posts brought to you by Yet Another Related Posts Plugin.

“CSMA/CA attempts to avoid collisions by using explicit packet acknowledgment (ACK), which means an ACK packet is sent by the receiving station to confirm that the data packet arrived intact.”

- Wireless communication and and network by Vijay Garg

Related posts:

1. (Ke Liu’s) NS2 Wireless trace meaning and explanation

Related posts brought to you by Yet Another Related Posts Plugin.