written 2.9 years ago by
teamques10
★ 64k
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modified 2.4 years ago
by
binitamayekar
★ 6.4k
|
|
written 2.9 years ago by
teamques10
★ 64k
|
| Technology | IS-95 | WCDMA | Cdma 2000 |
|---|---|---|---|
| Year of First Use | 1995 | 2001 | 2000 |
| Generation | 2G | 3G | 3G |
| Channel Bandwidth | 1.25 MHz | 5MHz | 1.25MHz |
| Chip rate | 1.228 Mcps (Megachips per second) | 3.84 Mcps | 1x: 1.2288 Mcps, |
3x: 3.6864 Mcps | | Data rate | 14.4 kbps - IS-95A ; 115 kbps - IS-95B | 384 kbps | 144 kbps | | Modulation Schemes | CDMA | QPSK, BPSK | 16 QPSK | | Frame size | 20ms | 10ms | 5ms, 10ms or 20ms | | Multiple Access | CDMA | CDMA | CDMA/TDMA | | Power Control Frequency | 500Hz | 1500 Hz | 800 Hz | | Handoff | Soft | Soft | Soft | | Voice and Data at the same time | No | Yes | Not for EVDO , Yes for EVDV | Cdma2000: The bandwidth supported are 1.25 MHz, 3.75 MHz, 7.5 MHz, 11.25 MHz and 15 MHz. cdma2000 uses a base spreading rate of of 1.2288 MHz. The spreading rates are 1.2288 * N Mcps.
WCDMA: The bandwidth supported by WCDMA are 5, 10 and 20 MHz. W-CDMA uses a base spreading rate of 4.096 MHz.
EVDO is Evolution of Data Only with EVDO=1*RTT (Radio Transmission Technology) and in this only data can be evolved.
While EVDV is Evolution of Data and Voice with EVDV=3*RTT and in this voice and data can be evolved simultaneously.
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