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Wireless Communications

Wireless Communications. H. H. Agenda. Authoring Division Name File Name Security Notice (if required). Wireless Communications Overview Important Technical specifications.

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Wireless Communications

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  1. Wireless Communications H

  2. H Agenda Authoring Division Name File Name Security Notice (if required) Wireless Communications Overview Important Technical specifications

  3. Yesterday Today Tomorrow technology focus service focus Digital Analog Cellular Cellular AMPS,TACS, JTACS,NMT NADC-TDMA, GSM, PDC, DCS1800, PCS1900, CDMA Two-Way Radio Two-Way Radio Intelligent Networks & Functional Databases Conventional PMRS Trunked SMR ESMR PCS Paging Paging Tone, Display, Voice ERMES, POCSAG, GSC, FLEX Tone Only Next Generation Cordless Cordless CT2/CT2+, DECT, PHS, WACS/PACS CT0, CT1 Satellite Iridium, Odyssey, Globalstar, INMARSAT-P Wireless Data CDPD H 1800MHz 1500MHz 900MHz 1200MHz Wireless Communications Overview Authoring Division Name File Name Security Notice (if required) 30MHz 300MHz 600MHz 2000 MHz Two-Way Cellular Paging Satellite Cordless

  4. H PCS: A Telecommunications Revolution Authoring Division Name File Name Security Notice (if required) • PCS is a vision, not a technology • It is a family of services interconnecting people, not locations • It will make possible the vision of communications anytime, anywhere, to anyone...

  5. H The Information Highway - Services Fixed Mobile Authoring Division Name File Name Security Notice (if required) Application: TV Programs Movies - VOD, PPV, etc. Voice Communication Electronic Bulletin Board, Info Services Hardcopy TV Set, Set-Top Box Printer Computer/Modem Telephone Mobile Telephony "Walkaround" Voice Communication Mobile Data - e-mail, Info Services Mobile Phone Handheld Phone Laptop/Palmtop w/Wireless Modem Device:

  6. H What is Wireless? Technology Authoring Division Name File Name Security Notice (if required) Industry/Application CDMA TDMA MIRS FLEX CT2 AMPS GSM DECT PHS etc. Mobile Phone Service (Cellular 1) Mobile Phone Mfgr., Base Station Mfgr. (Ericsson, Motorola) Paging Service (Skytel) High-End Mobile Phone, Messaging Service (Nextel) Wireless LAN Equipment (Proxim) Wireless Component Supplier (Spectrian)

  7. Russia Europe China Taiwan Singapore Australia H Cellular & Cordless Communication System Service Areas Authoring Division Name File Name Security Notice (if required) Nordic Countries Canada UK Japan United States S Korea Mexico India Hong Kong Africa Central America Columbia (parts of Africa only) Sri Lanka Philippines South America New Zealand Digital Cordless Analog Cordless Analog Cellular Digital Cellular NMT JCT DCS 1800 CT2 CT2+ NADC (TDMA) CT1 CT1+ AMPS TACS GSM PDC DECT CT0 PHS CDMA

  8. Channel f1 Channel f1 Channel f2 H Two-Way Radio Architecture Conventional Radio Authoring Division Name File Name Security Notice (if required) dispatcher Trunked Radio dispatcher

  9. H Cordless Architecture Authoring Division Name File Name Security Notice (if required) Base/ Switch Base/ Switch Base/ Switch Base/ Switch Base/ Switch Fixed Network (PSTN) Base/ Switch Base/ Switch Base/ Switch

  10. Cordless H Next Generation Cordless: PCS? Authoring Division Name File Name Security Notice (if required) FAX • Higher user densities are possible • Ready for data and ISDN • Future capabilities can be added Next Generation Cordless Cellular • Micro/picocellular vs Macrocellular • No infrastructure issues • Lower cost of equipment

  11. H Paging Network Architecture Tx Site Controller Authoring Division Name File Name Security Notice (if required) Billing and Management System Paging Transmitters Public Switched Network Paging Terminal Network Controller Tx Site Controller

  12. BS Switch (MSC) Fixed Network (PSTN) BS BS BS BS BS BS MS BS Switch (MSC) H Cellular Architecture Authoring Division Name File Name Security Notice (if required)

  13. H PCS "Mixed Cell" Architecture Macrocell base station Indoor Picocell Authoring Division Name File Name Security Notice (if required) Indoor Picocell Microcell base stations Microcell network Macrocell network

  14. H Satellite Architecture Authoring Division Name File Name Security Notice (if required)

  15. H Iridium System Overview Ka-Band Authoring Division Name File Name Security Notice (if required) Ka-Band L-Band PUBLIC SWITCHED TELEPHONE NETWORK Ka-Band L-Band Ka-Band L-Band GATEWAY OFFICE PHONE BOOTH IRIDIUM SYSTEM CONTROL PAGER HOME TERRESTRIAL CELLULAR IRIDIUM DUAL MODE SUBSCRIBER UNIT (ISU) ISU

  16. H Microwave Wireless Communications Authoring Division Name File Name Security Notice (if required) Satellite Microwave Radio

  17. H Transmitter - Basic Functions Encoded data Analog voice signal Authoring Division Name File Name Security Notice (if required) Modulator Voice Coder MA Amp MUX Amplified signal Data bits RF signal for transmission

  18. H Receiver - Basic Functions Authoring Division Name File Name Security Notice (if required) Analog voice signal Voice Decoder Demod Speaker MA Amp De- MUX Amplified signal Demodulated data bits

  19. Quantization #2 (Formatting Analog Information) 111 110 101 #3 100 Encoding 011 010 001 000 time #1 Sampling 111 110 101 100 011 010 011100100010001001001011101111111110 001 000 H How Do We Go from a Voice Signal to Bits? Authoring Division Name File Name Security Notice (if required)

  20. H Voice CODEC (COder/DECoder) Authoring Division Name File Name Security Notice (if required) • Convert Voice Between Analog and Digital • Reduce the Bit Rate for Transmission • Provide Voice Quality Comparable to Analog

  21. H Why Modulate? Authoring Division Name File Name Security Notice (if required) • To transform signals into waveforms that are compatible with the characteristics of the channel • To allow simultaneous transmission of two or more baseband signals by translating them to different frequencies

  22. H Trends in the Industry Authoring Division Name File Name Security Notice (if required) TDMA,CDMA Signals Time-Variant Signal Complexity QAM, FSK, QPSK Vector Signals AM, FM Scalar Signals Required Measurement Capability

  23. H Modulation Formats Analog Digital Authoring Division Name File Name Security Notice (if required) AM ASK FM FSK M PSK

  24. /4 Shifted DQPSK Binary Phase Shift Keying (BPSK) Q Q 1 0 0 1 0 1 1 0 1 0 3 I 1 0 I 1 5 I Q 4 2 6 Quadrature Phase Shift Keying QPSK Q 1 0 0 1 1 1 0 0 1 0  Symbol 01 1 0 0 1 0 1 1 0 1 0 00         I I Q 10 11 H Common Digital Modulation Formats Authoring Division Name File Name Security Notice (if required) I Q

  25. H Modulation Formats in Wireless Communications Authoring Division Name File Name Security Notice (if required) Analog Digital AMPS TACS JTACS NMT SMR CT0 CT1 NADC PDC PHS GSM CDPD DCS1800 CDMA CT2 DECT /4 DQPSK FM GMSK QPSK/OQPSK GFSK

  26. H How Does Communication Take Place? Authoring Division Name File Name Security Notice (if required) 3 Common Data Structures: Power Time Time Power FDMA Frequency Power Time CDMA Frequency FDMA/TDMA Frequency

  27. H Duplex Methods Frequency Division Duplex (FDD) Authoring Division Name File Name Security Notice (if required) Amplitude Time Tx Rx Time Division Duplex (TDD) F1 F2 Frequency Amplitude Time Rx Tx Rx Tx Frequency F1

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