Terminology section- Difference between TD-SCDMA, WCDMA and CDMA2000

TD-SCDMA vs WCDMA vs CDMA2000

This page covers difference between TD-SCDMA, WCDMA and CDMA2000 technologies and provide link to resources on GSM,WCDMA and more.



Specifications TD-SCDMA WCDMA CDMA2000
Full Form Time Division-Synchronous Code Division Multiple Access, Utilizes concept of TDMA,FDMA,CDMA and SDMA Wideband Code Division Multiple Access Also known as IMT-2000, as the specifications introduced in service in the years 2000-2002. Supports 1x EV-DO (Evolution Data Only) and 1x EV-DV (Evolution Data and Voice)
RF Carrier Frequency It is utilized in China, uses frequencies between 1785-2220 MHz For 2100 MHz Band: 1920-1980 Uplink, 2110-2170 downlink, For 1900 MHz band: 1850-1910 Uplink, 1930-1990 Downlink, 806-960 MHz, 1710-2025 MHz, 2110-2200 MHz 2500-2690 MHz
Channel Bandwidth Uplink and downlink share 1.6 MHz band(for 1.28 Mcps) with 7 timeslots per frame, 16 codes per timeslot. 5MHz band is also specified for 3.84Mcps TDD case. 5 MHz 1.25 MHz
Frame Structure Super frame=720ms, radio frame=10 ms, sub frame=5ms 10 ms 20 ms
Duplex technique TDD FDD FDD
Spectrum Allocation Need unpaired spectrum for both Downlink(DL) and Uplink(UL) Need paired spectrum one for UL and the other for DL >Need paired spectrum one for UL and the other for DL
Spectrum Efficiency For asymmetric traffic,the slots are allocated according to uasage and hence single spectrum is efficiently used for both DL and UL(TDD case). For asymmetric traffic, as the bands are allocated dedicately for DL and UL, the spectrum gets wasted when there is no data to be send/receive. For asymmetric traffic, as the bands are allocated dedicately for DL and UL, the spectrum gets wasted when there is no data to be send/receive.
Chip rate per carrier 1.28 Mchips/sec 3.84 Mchips/sec 1.2288 Mchips/sec
Modulation supported QPSK,8PSK,16QAM QPSK, 16QAM QPSK,8PSK,16QAM
Spreading Factor 1/2/4/8/16 4 to 256 -
Forum website link www.tdscdma-forum.org/en/ www.umts-forum.org/ www.umts-forum.org/

Useful Links

TD-SCDMA tutorial   TD-SCDMA Chip vendors   TD-SCDMA physical layer   GSM Tutorial   CDMA Tutorial   Multicarrier CDMA  

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