lecture23

lecture23 - Lecture Outline (Week 13, lecture 1) Wireless...

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Lecture Outline (Week 13, lecture 1) Wireless Communications – 2 nd Generation (TDMA, GSM) Reading: Focus on these notes. Supplementary: text2 10.4.1 1. First Generation Wireless Communications First Generation (AMPS) based on analog speech. Two 20 MHz bands granted 1980. (824-844 MHz reverse, 869-889 MHz forward). Each 20 MHz divided into 667 frequency channels of 30 Khertz. Channels access is called FDMA Each geographical area has two service providers (duopoly) to enhance competition. Cells are organized into clusters of N cells each labeled from 1 to N , 2 2 j ij i N + + = Co-channel interference γ ) 3 ( N SIR where 4 2 . By 1989, FCC granted another 5 MHz each way to alleviate congestion. Need for new technology that is more bandwidth, power, and cost efficient. 2. Second Generation Wireless in US – TDMA and PCS Second Generation based on digital technology for speech and some low speed data. Same channel (AMPS 30 KHz) divided into 3 time division channels (TDMA).
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lecture23 - Lecture Outline (Week 13, lecture 1) Wireless...

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