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

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Presentation on theme: "14th June 2006 RANDAXHE Benjamin 1 Thanks to M CATTRYSSE Eric."— Presentation transcript:

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 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: Mhz WCDMA-FDD Downlink: Mhz  Proximus: 3 carriers out of 12 WCDMA-TDD: Mhz and 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, W)-121 dBm (7, W) NB: Thermal noise ± -108 dBm (1, )

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

31 Question

32 Thank you


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