19th Jan, 2020

Universität Regensburg

Question

Asked 16th Oct, 2016

The Definition of RSSI is 'Total received wide-band power by UE'

1. I have confusion in understanding that what is meant by *wide-band* here.

My understanding is as follows

- In case if Carrier Bandwidth of LTE channel is 10 MHz,total bandwidth is 10 MHz and hence RSSI is calculated for all the all the Resource blocks i.e. 50 RB
- Each RB has 12 subcarriers. Hence for 10 MHz channel, 50 RB are dedicated => 12x50 = 60 subchannels
- Finally (
*Assuming same Pt for all subcarrier*) P_{r}= P_{t}*(c/4*pi*d*F*)^{2 . }**What is the F should I put and is this the right way to calculate the Pr? In my opinions F = 15KhZ.**Where Pr is Received Power per subcarrier by UE. (Using **Finally RSSI = Pr*12*50 [ or dBm 10*log10(Pr) + 10*log10(12*50) ]**

2. Or RSSI is calculated in any different way in simulation / How can I make simulation model to calculate RSSI. Do I have to make a model with a complete RB with all Resource Elements (RE). If yes, then do I need to do the scheduling as well?

3. How can I calculate SINR with RSSI?

Thanks

Shan

If you have found your answer by now, please let me know.

I do have the exact same problem regarding the choice of frequency to calculate RSSI.

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@Zoubair Boulahia.

Thank for your code.

However, every comment is in Chinese. Although I have translated it with google Translator. However, it would be quite helpful if you can give a little summary of how it is helpful to me in understanding the RSSI?

'RSSI' is the abbreviation for Received Signal Strength Indicator. It is a DC signal and is generated in the first IF processor IC in the receiver of a super heterodyne radio. It is calibrated and data sheet of the IC gives the linear relationship between SNR value and RSSI voltage.

Now, the RSSI voltage corresponding to the threshold value of SNR is known and so this value can be used for other calculations.

Just as SNR will peak for a particular frequency RSSI will also follow the same pattern. The 3-dB bandwidth for the radio will be about 10 KHz. If the radio is designed for broad band operation, the performance will remain steady within the declared BW (maybe 10 MHz for high band set).

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