lecture23 - EE455/591 2nd Ge ration C llular Ne ne e tworks...

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EE455/591 EE455/591 2 2 nd nd Generation Cellular Networks Generation Cellular Networks TDMA and GSM TDMA and GSM Reading: Focus on thesenotes. Text 10.4.1 Reading: Focus on thesenotes. Text 10.4.1 Review: TheCellular Concept Review: TheCellular Concept Topics: 1. 1. 2G Wireless in US – TDMA and PCS 2G Wireless in US – TDMA and PCS 2. 2. 2G Wireless for Europe- GSM 2G Wireless for Europe- GSM 3. 3. GSM Channel Architecture GSM Channel Architecture 4. 4. GSM Modulation and Coding GSM Modulation and Coding
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Review: TheCellular Concept 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 30KHz frequency channels Channels access is called FDMA 2 service providers (duopoly) Cells in a cluster labeled 1 to N FCC allocated extra 5GHz in 1989 Second Generation needed: Use less bandwidth Use less power But higher data rates Smaller and cheaper handset N=7. (i, j)=(1,2) i 2 +ij+j 2 = 1+2+4=7=N
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Review: Signal to Interference Ratio SIR The shortest distance between two co-channel cell is D N Co-channel interference (Signal to Interference Ratio) is approximately: SIR ~ 1/(R/D N ) γ (n is the fadeexponent, usually 2 < γ < 4) Using the relationship between R and D N : 1G (AMPS): N=12,13 2G (D-AMPS): N=7 2G (GSM): N=3,4
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