Wireless Communication is my favourite topic in Engineering.
If you have heard about wireless communications, but are not certain what it all means, this short article might help clarify some of your questions. It presents an easy-to-understand description of two-way wireless communications between mobile and stationary consumer devices from the hardware perspective.
---
What are Mobile Embedded Devices?
Mobile embedded devices are small consumer products with small dedicated computers inside them. Some examples of mobile embedded devices are hand-held, battery-operated products such as cell phones, two-way pagers, and personal organizers that you can carry with you in a pocket or purse. Most mobile devices communicate with other devices by way of a wireless link. This wireless link may use Infrared (IR) light, or more frequently, radio waves (RF) to enable the two-way communication without a cord.
Mobile embedded devices are small consumer products with small dedicated computers inside them. Some examples of mobile embedded devices are hand-held, battery-operated products such as cell phones, two-way pagers, and personal organizers that you can carry with you in a pocket or purse. Most mobile devices communicate with other devices by way of a wireless link. This wireless link may use Infrared (IR) light, or more frequently, radio waves (RF) to enable the two-way communication without a cord.
---
Establishing Communication
A common example of a wireless mobile device that uses IR to establish a communication link is a television or stereo remote. You may point the remote at the television or stereo from across the room, and click buttons to turn the target device on or off and change channels. This is possible because the remote has an IR transmitter and its target device has an IR receiver that enables the one-way communication of data. On the other hand, cell phones are wireless devices that use radio frequency (RF) to communicate with cellular base stations (cell sites). This is done at UHF and microwave frequencies.
A common example of a wireless mobile device that uses IR to establish a communication link is a television or stereo remote. You may point the remote at the television or stereo from across the room, and click buttons to turn the target device on or off and change channels. This is possible because the remote has an IR transmitter and its target device has an IR receiver that enables the one-way communication of data. On the other hand, cell phones are wireless devices that use radio frequency (RF) to communicate with cellular base stations (cell sites). This is done at UHF and microwave frequencies.
New versions of mobile or portable devices are being designed with an internal wireless link capability to connect to a stationary device such as a personal computer (PC) or office telephone system. This lets the user to move around the office or even around the building and still maintain connection with the stationary system.
Satellites are also wireless systems that use RF to communicate. Satellite communications include such things as the Global Positioning System (GPS) that you can use to easily find your current location within 50 feet.
Satellites are also wireless systems that use RF to communicate. Satellite communications include such things as the Global Positioning System (GPS) that you can use to easily find your current location within 50 feet.
---
Transferring Data
The embedded chip at each end of the wireless communication runs software for interacting with the end user and managing the transmission. For example, a personal organizer could run software that lets the consumer connect through a PC to the Internet and download updates to its scheduling program.
The embedded chip at each end of the wireless communication runs software for interacting with the end user and managing the transmission. For example, a personal organizer could run software that lets the consumer connect through a PC to the Internet and download updates to its scheduling program.
---
Conclusion
Consumers are rapidly embracing wireless devices, and the possibilities are limited only by the imagination. Java-based consumer and embedded technologies make application development fast, efficient, and easy because applications written to a reference implementation run on any device that supports the reference implementation.
Consumers are rapidly embracing wireless devices, and the possibilities are limited only by the imagination. Java-based consumer and embedded technologies make application development fast, efficient, and easy because applications written to a reference implementation run on any device that supports the reference implementation.
---
I got this article interesting for the beginners who wants to know about wireless communication, this is taken from http://developers.sun.com/mobility/getstart/articles/hardware/
___________________________________________________________
No comments:
Post a Comment