Hi,
I'm currently studying that topic and would like to ask numerous questions please.
Otherwise, I don't understand how they reached the 960K and 15K figures.
Did I get it right?
What is operator, in terms of channel, cell, cluster?
What do they mean by three cell layers?
Thank you.
I'm currently studying that topic and would like to ask numerous questions please.
1. The modulation symbol rates refers to the data signal, before it's being spread?The chip rate of a WCDMA system is 3.84 Mcps.
Spreading factors range from 256 to 4 in the up link.
Thus, the respective modulation symbol rates vary from 960K symbols/s to 15K symbols/k.
Otherwise, I don't understand how they reached the 960K and 15K figures.
2. Each channel takes 38400 chips out of the (2^18 - 1) exist in a Gold code, and each of the 15 slots of this frame takes 38400/15 chips out of these 38400 chips?The frame length is 10ms and each frame is divided into 15 slots (2560 chip/slot at the chip rate 3.84 Mcps).
For separating channels from the same source, orthogonal variable spreading factor (OVSF) channelization codes are used.
In the downlink, Gold codes with a 10-ms period (38400 chips at 3.84 Mcps) are used to separate different cells, with the actual code itself length 2^18 - 1 chips.
Did I get it right?
3. I don't manage to understand that part.The carrier spacing has a raster of 200KHz, and can vary from 4.2 to 5.4 MHz. Figure 6.1 shows an example for the operator bandwidth of 15MHz within three cell layers.
What is operator, in terms of channel, cell, cluster?
What do they mean by three cell layers?
Thank you.
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