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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