1. 14th June 2006 RANDAXHE Benjamin 1 Thanks to M CATTRYSSE Eric

2. 2 Presented by Randaxhe Benjamin In order to receive Electronics Bachelor Diploma (Telecommunication oriented) Academic year : 2005 ~ 2006 Memoir

3. UMTS, air interface et modulation Presented by Benjamin Randaxhe

4. RANDAXHE Benjamin4 14th June 2006 UMTS  Overview Air interface  Generality  Coding  Power Modulation  UMTS modulator  RAKE receiver

5. RANDAXHE Benjamin5 14th June 2006 UMTS  Overview Air interface  Generality  Coding  Power Modulation  UMTS modulator  RAKE receiver

6. RANDAXHE Benjamin6 14th June 2006 Universal Mobile Telecommunications System 3 rd generation mobile Multimedia services High bitrate New services : Video Call, TV, internet browsing, games,…

7. RANDAXHE Benjamin7 14th June 2006

8. RANDAXHE Benjamin8 14th June 2006 UMTS OOverview Air interface GGenerality CCoding PPower Modulation UUMTS modulator RRAKE receiver

9. RANDAXHE Benjamin9 14th June 2006 1 1 1 1 1 1 1 1 1 1 1 1 1 UMTS Frequency is used in every cell Dissociation by code => CDMA Two codes are used  Channelisation  Scrambling => WCDMA

10. RANDAXHE Benjamin10 14th June 2006

11. RANDAXHE Benjamin11 14th June 2006 UMTS 1 Carrier = 5Mhz WCDMA-FDD Uplink: 1920 - 1980 Mhz WCDMA-FDD Downlink: 2110-2170 Mhz  Proximus: 3 carriers out of 12 WCDMA-TDD: 1900-1920 Mhz and 2010 - 2025 Mhz  Proximus: 1 carrier out of 4 Time Frequency Power Uplink SpectrumDownlink Spectrum 1920 MHz1980 MHz2110 MHz2170 MHz Duplex Spacing : 190MHz 5 MHz UMTS USER 1 UMTS USER 2 Full duplex Separate frequencies used for uplink and downlink traffic

12. RANDAXHE Benjamin12 14th June 2006 UMTS OOverview Air interface GGenerality CCoding PPower Modulation UUMTS modulator RRAKE receiver

13. RANDAXHE Benjamin13 14th June 2006 Channelisation  OVSF  Separation of channels Scrambling  Pseudo Noise codes  Separation of transmitters : MS or Node B Modulator ChannelisationScrambling Clock Data + CRC +… bits chips

14. RANDAXHE Benjamin14 14th June 2006  User 3 C chan 3 User 2 C chan 2 User 1 C chan 1 C scr UE1 UE2 UE3

15. RANDAXHE Benjamin15 14th June 2006 User 1 C chan C scr 1 UE1 UE2 UE3 User 2 C chan C scr 2 User 3 C chan C scr 3

16. RANDAXHE Benjamin16 14th June 2006 UMTS OOverview Air interface GGenerality CCoding PPower Modulation UUMTS modulator RRAKE receiver

17. RANDAXHE Benjamin17 14th June 2006 Everyone use the same frequency  Avoid interference between Node B ’s themselves  Avoid « near-far effect » UE 1 UE 2 UE 3 Power sent UE 1 UE 2 UE 3 Power received MAX min UE 1 UE 2 UE 3 Power sent UE 3 UE 2 UE 1 Power received MAX min UE1 UE2 UE3

18. RANDAXHE Benjamin18 14th June 2006 Open loop  Increases power step by step Closed loop  Power is regulated 1500 time per second

19. RANDAXHE Benjamin19 14th June 2006MS Node B Sent 33 dBm (2W) -60 dBm (1 nanoW) 46 dBm (40W) 12 dBm (20mW) Received -117 dBm (1,9.10 -15 W)-121 dBm (7,9.10 -16 W) NB: Thermal noise ± -108 dBm (1,514.10-14)

20. RANDAXHE Benjamin20 14th June 2006 UMTS OOverview Air interface GGenerality CCoding PPower Modulation UUMTS modulator RRAKE receiver

21. RANDAXHE Benjamin21 14th June 2006 C scr  QPSK Modulator DPDCH 1  SCH DPDCH 2 DPDCH x PDSCH PCCPCH SCCPCH PICH AICH CPICH DPCCH

22. RANDAXHE Benjamin22 14th June 2006 Series Parallel C chan  Data Power Control *j Chips jQ I

23. RANDAXHE Benjamin23 14th June 2006 C scr  QPSK Modulator DPDCH 1  SCH DPDCH 2 DPDCH x PDSCH PCCPCH SCCPCH PICH AICH CPICH DPCCH

24. RANDAXHE Benjamin24 14th June 2006 Two speparated signals:  Data  Control HPSK Modulation Channelisation Data Control Scrambling Modulator *j

25. RANDAXHE Benjamin25 14th June 2006 QPSKHPSK

26. RANDAXHE Benjamin26 14th June 2006 UMTS OOverview Air interface GGenerality CCoding PPower Modulation UUMTS modulator RRAKE receiver

27. RANDAXHE Benjamin27 14th June 2006 Problems : Reflected RF Absorbed RF Diffraction

28. RANDAXHE Benjamin28 14th June 2006 With a reference channel, RAKE receiver is able to detect and to correct the corrupted signal Rake #3 Rake #2 Original signal is found Rake #1 Combiner Data corrected Data received Data sent

29. Thank you

30. Presentation and memoir http://users.skynet.be/bk331357/umts/

31. Question http://users.skynet.be/bk331357/umts/

32. Thank you