1 / 11

WIRELESS COMMUNICATIONS

Wireless communications is a type of data communication that is performed and delivered wirelessly. This is a broad term that incorporates all procedures and forms of connecting and communicating between two or more devices using a wireless signal through wireless communication technologies and devices. http://www.c2mtech.com/

Claira_Ross
Download Presentation

WIRELESS COMMUNICATIONS

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. WIRELESS COMMUNICATIONS

  2. Timeline of Major Developments • Mobile Telephone System (MTS) • Introduced in 1946 • Simplex (one-way transmission) and manual operation • Improved Mobile Telephone System (IMTS) • Introduced in 1969 using a 450 MHz band • Advanced Mobile Phone Service (AMPS) • Introduced in 1983 • First system to employ a “cellular” concept

  3. Cellular Topology • Cellular network: • Series of overlapping hexagonal cells in a honeycomb pattern • Cellular network components • Base Station:Transmitter, Receiver, Controller, Antenna • Cell: Base station’s span of coverage • Mobile Switching Center: Contains all of the control and switching elements to connect the caller to the receiver, even as the receiver moves from one cell to another

  4. Digital Access • D-AMPS (Digital-AMPS) • TDMA (Time Division Multiple Access) • CDMA (Code Division Multiple Access) Digital wireless technologies provide greater system capacity.

  5. CDMA • CDMA • Third generation system • Separates users by assigning them digital codes within a broad range of the radio frequency • First technology to use soft-handoff • Employs spread spectrum technique • Advantages • Improved capacity, coverage, voice quality, and immunity from interference

  6. An Overview of Cellular Technologies

  7. Wireless Applications • Cellular Phone • High mobility and narrow bandwidth (20 to 30 kHz) • Cordless Phone • Low mobility and narrow bandwidth (20 to 30 kHz) • Wireless LAN • Low mobility and high bandwidth (typically 10 Mbps) • Wireless Application Protocol (WAP) is a standard for wireless data delivery, loading web pages, and navigation

  8. The Wireless Spectrum

  9. Cellular Communications • Mobile telephone service - a system for providing telephone services to multiple, mobile receivers using two-way radio communication over a limited number of frequencies. • Mobile wireless evolution: • First generation • Second generation • Third generation

  10. Global System for Mobile Communications (GSM) • A version of time division multiple access (TDMA) technology, because it divides frequency bands into channels and assigns signals time slots within each channel. • Makes more efficient use of limited bandwidth than the IS-136 TDMA standard common in the United States. • Makes use of silences in a phone call to increase its signal compression, leaving more open time slots in the channel.

  11. Contact Us at :- • Address -: c2mTech1313 Valwood Suite #320 Carrollton, Texas 75006 • Phone No -: (P) 972-881-2268 Dallas(P) 817-442-2268 Ft. Worth(F) 972-221-9366 • Website -: http://www.c2mtech.com/ • Sales Representative -: sales@c2mtech.com

More Related