Jun 172009
WCDMA has 3.84 Mcps (chip per second).
One 10-ms radio frame is divided into 15 slots.
1000 ms has 3.84 10^6 chips
10 ms has 3.84 10^4 chips
15 slots have 3.84 10^4 chips
1 slot has 38400/15 = 2560 chips
downlink spreading factor from 4 to 256
uplink spreading factor from 4 to 512
With spreading factor 4,
1 slot has 2560/4 = 640 symbols
15 slot has 640 * 15 = 9600 symbols
10 ms has 9600 symbols
1000 ms has 9600 * 100 = 960K symbols
In QPSK, 1 symbol has 2 bits.
Thus, the answer is 1.92Mbps
Note that this is only for one channel (i.e., code)! One user may have several channels simultaneously.
