1. Polytechnic University  M. Veeraraghavan 1 State-of-the-art in commercial wireless communications Prof. Malathi Veeraraghavan Elec. & Comp. Engg. Dept/CATT Polytechnic University mv@poly.edu EL604: Wireless & Mobile Networking

2. Polytechnic University  M. Veeraraghavan 2 Types of wireless networks Cellular telephony (high-tier) Cordless telephony (low-tier) Wireless data Paging Specialized Mobile Radio (SMR) Mobile satellite 3G wireless

3. Polytechnic University  M. Veeraraghavan 3 Types of cellular telephony networks Cellular telephony –Analog: Advanced Mobile Phone Service (AMPS): FDMA –Digital: Global System for Mobile (GSM) communications –TDMA based system used in Europe and many parts of the world North American TDMA (NA-TDMA): IS-136 –also referred to as Digital AMPS, American Digital Cellular (ADC) Code Division Multiple Access (CDMA): IS-95

4. Polytechnic University  M. Veeraraghavan 4 Types of cordless systems CT2: Cordless Telephone, Second generation –European cordless sytem (since 1989) DECT: Digital European Cordless System –Wireless PBX system PHS: Personal Handyphone System –Popular system in Japan

5. Polytechnic University  M. Veeraraghavan 5 Types of wireless data systems Wireless LAN –IEEE 802.11 –ETSI HiperLAN –Unlicensed band called Industrial, Scientific and Medical (ISM) band US FCC: 902-928Mhz, 2400 to 2483.5 Mhz, and 5725 to 5850 Mhz Proprietary systems: –RAM Mobile Data –Advanced Radio Data Information Systems (ARDIS) Cellular systems based wireless data access –CDPD (Cellular Digital Packet Data) –GPRS (GSM Packet Radio Service) –GSM and IS-136 circuit-switched data services –EDGE: Enhanced Data Rate for GSM Evolution