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Sunday, May 01, 2005

Comparing Wireless Network Technology

By: Murali Kiruba
This article discuses the various types of wireless networks and the speed, distance of each type of wireless network.

1.NARROWBAND WIRELESS LANS:

Narrowband Wireless LANS keep the radio signal frequency narrower and have an ability to pass the information along the narrower range. Though the distance through these LANS is reasonable, the speeds available aren't adequate enough for corporate users. The major problem that would occur is interference. But it can be overcome by allowing individual users onto inividual frequencies.

2.PERSONAL COMMUNICATIONS SERVICES: (continued...)

PCS is comprised of an entire range of mobile, portable and auxilary communications services for both business and personal use. There are 2 types of PCS as explained below

a. NARROWBAND PCS: The size of the spectrum is smaller than broadband PCS. Narrowband PCS applications include paging, text messaging, wireless email, wireless telemetry.

b. BROADBAND PCS: This type of PCS has larger spectrum compared to narrowband PCS. Broadband PCS application include all Mobile Telephone services and Mobile Data Services. All these Mobile set of services are available to the users via small. portable, multifunctional devices like digital camera, cellphones etc.

3. SATELLITE: Using satellite networks, the speed would be higher ranging around 1-2 Mbps for upload and download correspondingly. The great advantage of satellite networks is their huge coverage area, The major drawback of these networks is the delay that exists while connecting. So these networks are found to be inadequate when dealing with bursts in traffic.

4. INFRARED WIRELESS LANS: Infrared wireless LANS have a shorter available range, their speed range is increasing from 115Kbps to 4Mbps. In the near future, usage of "Very Fast InfraRed" (VFIR) may increase the speed upto 16Mbps. These type of LANS are used in Laptop to PDA transfers and between laptops.

5. SPREAD SPECTRUM WIRELESS LANS: These LANS are a wideband radio frequency technique using LANS. These LANS are both reliable and secure. The most popular WLAN used is 802.11b that runs upto 11Mbps, but the 802.11g specification can boost it up to around 22Mbps.The 802.11a with 5Ghz range can run a bandwidth around 50Mbps which can increase to 100Mbps in the near future. But the distance is less than what we get with 802.11b & 802.11g 2.4Ghz range, (i.e) around 300 feet or so. Usually considering these factors 802.11a is used in shorter distance outdoor regions while 802.11b/g is used indoors.

About The Author:
K.Murali graduated from St.Peter’s Engineering College, affiliated to Chennai University, India in Electronics and Communication Engineering in 2004. He has started his career as a Software Engineer in Net-O2 Technologies, Chennai, India. He has presented technical papers on Bio-Medical Engineering, Digital Wireless Communication, Tele-Medicine, and Spread Spectrum Techniques. His current research interests are in the areas of Biometrics and Wireless Mobile Internet.