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

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

UMTS, air interface et modulation Presented by Benjamin Randaxhe

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

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

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,…

RANDAXHE Benjamin7 14th June 2006

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

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

RANDAXHE Benjamin10 14th June 2006

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

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

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

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

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

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

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

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

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, )

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

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

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

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

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

RANDAXHE Benjamin25 14th June 2006 QPSKHPSK

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

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

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

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Presentation and memoir

Question

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