The noise figure is measured by integrating noise power across the full-received signal bandwidth of 3.84 MHz using a matched filter.
3.84MHz is the channel Bandwidth and 5MHz is the channel spacing.
Receiver sensitivity according to 3GPP spec is measured in dBm/3.84MHz.
In GSM the channel Bandwidth is 180kHz and channel spacing is 200kHz.
The noise figure is measured by integrating noise power across the full-received signal bandwidth of 3.84 MHz using a matched filter.
3.84MHz is the channel Bandwidth and 5MHz is the channel spacing.
Receiver sensitivity according to 3GPP spec is measured in dBm/3.84MHz.
In GSM the channel Bandwidth is 180kHz and channel spacing is 200kHz.
There are 0.5dB difference in Noise Floor between 180kHz and 200KHz BW.
For a Sensitivity measurement would be no big difference between these two BW because anyway you need another ~10dB margin to reduce the Noise Floor significantly below the required sensitivity level.
so you mean in GSM and DECT we can use the channel spacing as the bandwidth to calculate the noise figure approximately and in WCDMA we have to use the chip rate instead of the channel spacing as the bandwidth to calculate the noise figure. am i right?
in fact, i also have the data rate for WCDMA (+chip rate), GSM and DECT, what is this? why we cannot use the data rate as the bandwidth?
For GSM/DECT you can use approximately the channel spacing for NF measurement, but I don’t understand why you don’t use the channel bandwidth, now when you know what is about.
In WCDMA (because is spread spectrum) the chip rate dictate the channel BW, and not the data rate.
For GSM/DECT you can use approximately the channel spacing for NF measurement, but I don’t understand why you don’t use the channel bandwidth, now when you know what is about.
In WCDMA (because is spread spectrum) the chip rate dictate the channel BW, and not the data rate.
to answer your question, it is simply because the channel bandwith is not given in the question/spec... only channle spacing and data rate are given for each case, in WCDMA chip rate is also given. so i was confused which to use
i think we can close this topic, thank you very much again