Tuesday, December 23, 2008
W-CDMA Technical features
* Radio channels are 5MHz wide.
* Chip rate of 3.84 Mcps
* Supports two basic modes of duplex: frequency division and time division. Current systems use frequency division, one frequency for up link and one for down link. For time division, FOMA uses sixteen slots per radio frame, whereas UMTS uses fifteen slots per radio frame.
* Employs coherent detection on both the up link and down link based on the use of pilot symbols and channels.
* Supports inter-cell asynchronous operation.
* Variable mission on a 10 ms frame basis.
* Multi mode transmission.
* Adaptive power control based on SIR (Signal-to-Interference Ratio).
* Multi-user detection and smart antennas can be used to increase capacity and coverage.
* Multiple types of hand off (or handover) between different cells including soft hand off, softer hand off and hard hand off.
* Chip rate of 3.84 Mcps
* Supports two basic modes of duplex: frequency division and time division. Current systems use frequency division, one frequency for up link and one for down link. For time division, FOMA uses sixteen slots per radio frame, whereas UMTS uses fifteen slots per radio frame.
* Employs coherent detection on both the up link and down link based on the use of pilot symbols and channels.
* Supports inter-cell asynchronous operation.
* Variable mission on a 10 ms frame basis.
* Multi mode transmission.
* Adaptive power control based on SIR (Signal-to-Interference Ratio).
* Multi-user detection and smart antennas can be used to increase capacity and coverage.
* Multiple types of hand off (or handover) between different cells including soft hand off, softer hand off and hard hand off.
# posted by margh @ 11:32 AM 
