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WCDMA TDD Physical layer vs WCDMA FDD Physical layer


This tutorial section on WCDMA (UMTS) basics covers following sub topics:
UMTS Tutorial  UMTS channels  measurements  PHY layer  TDD vs FDD PHY  RRC States  Security  Cell search  Bands  UARFCN  Frame 


The page covers difference between WCDMA TDD physical layer vs WCDMA FDD physical layer as per UTRA physical layer specifications.

Technical Specifications WCDMA TDD physical layer WCDMA FDD physical layer
Multiple Access type TDMA,CDMA(inherent FDMA) CDMA(inherent FDMA)
Duplex scheme TDD FDD
Channel spacing 5MHz and 1.66 MHz supported 5 MHz
Chip rate 3.84Mcps and 1.28Mcps 3.84Mcps
slot structure 15/14 slots per frame 15 slots per frame
Frame length 10ms
multi rate multi-code,multi-slot and OVSF(Orthogonal Variable Spreading Factor) multi-code and OVSF
FEC codes Convolutional coding R=1/2 or 1/3 constraint length K=9, turbo coding( 8 state PCCC R=1/3) , service based coding
Interleaving Inter-frame interleaving(10/20/40/80ms)
Modulation QPSK/8PSK QPSK
Detection Coherent type and based on midamble Coherent type and based on pilots
Burst types three types supported traffic,random access and synchronization NA
Dedicated channel power control Uplink: open loop, 100/200 Hz
Downlink: closed loop,rate<=800Hz
Fast closed loop, rate=1500 Hz
Intra frequency handover Hard handover soft handover,softer handover
Inter frequency handover hard handover
Intra cell interference cancellation Joint detection Advanced receivers at the base station
Channel allocation(UTRA R4) DCA supported No DCA needed
Spreading factors supported(UTRA R4) 1 to 16 4 to 512

WCDMA UMTS RELATED LINKS

What is WCDMA
FDMA vs TDMA vs CDMA
WCDMA MO CS call
WCDMA PS Call
CDMA vs GSM
WCDMA Compressed mode
Cell re-selection in GSM/WCDMA
IRAT handover GSM/WCDMA
Difference between TD-SCDMA,WCDMA,CDMA2000

What is Difference between

HSDPA vs HSUPA
TD-SCDMA Vs. WCDMA Vs. CDMA2000
FDMA Vs. TDMA Vs. CDMA
spreading vs scrambling

RF and Wireless Terminologies


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