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Lecture 7n
- 3. CDMA on signal level I data A key A signal A data key key sequence A Real systems use much longer keys resulting in a larger distance between single code words in code space. 1 0 1 1 0 0 1 0 0 1 0 0 0 1 0 1 1 0 0 1 1 0 1 1 0 1 1 1 0 0 0 1 0 0 0 1 1 0 0 A d A k A s
- 4. CDMA on signal level II signal A data B key B key sequence B signal B A s + B s data key 1 0 0 0 0 0 1 1 0 1 0 1 0 0 0 0 1 0 1 1 1 1 1 1 0 0 1 1 0 1 0 0 0 0 1 0 1 1 1 B d B k B s A s
- 5. CDMA on signal level III A k (A s + B s ) * A k integrator output comparator output A s + B s data A 1 0 1 1 0 1 A d
- 6. CDMA on signal level IV integrator output comparator output B k (A s + B s ) * B k A s + B s data B 1 0 0 1 0 0 B d
- 7. CDMA on signal level V comparator output wrong key K integrator output (A s + B s ) * K A s + B s (0) (0) ?
- 11. Telecommunications Systems year Subscribers [million] 0 200 400 600 800 1000 1200 1400 1600 1996 1997 1998 1999 2000 2001 2002 2003 2004 approx. 1.7 bn GSM total TDMA total CDMA total PDC total Analogue total W-CDMA Total wireless Prediction (1998) Mobile Phone Subscribers world-wide
- 12. Development of mobile telecommunication systems 1G 2G 3G 2.5G IS-95 cdmaOne IS-136 TDMA D-AMPS GSM PDC GPRS IMT-DS UTRA FDD / W-CDMA EDGE IMT-TC UTRA TDD / TD-CDMA cdma2000 1X 1X EV-DV (3X) AMPS NMT IMT-SC IS-136HS UWC-136 IMT-TC TD-SCDMA CT0/1 CT2 IMT-FT DECT CDMA TDMA FDMA IMT-MC cdma2000 1X EV-DO HSDPA
- 25. GSM: overview fixed network BSC BSC MSC MSC GMSC OMC, EIR, AUC VLR HLR NSS with OSS RSS VLR
- 27. GSM: elements and interfaces NSS MS MS BTS BSC GMSC IWF OMC BTS BSC MSC MSC A bis U m EIR HLR VLR VLR A BSS PDN ISDN, PSTN RSS radio cell radio cell MS AUC OSS signaling O
- 28. GSM: system architecture U m A bis A BSS radio subsystem MS MS BTS BSC BTS BTS BSC BTS network and switching subsystem MSC MSC fixed partner networks IWF ISDN PSTN PSPDN CSPDN SS7 EIR HLR VLR ISDN PSTN
- 29. System architecture: radio subsystem U m A bis A BSS radio subsystem network and switching subsystem MS MS BTS BSC MSC BTS BTS BSC BTS MSC