[Yvan]

Hi all,

I am using “LTE-A-DL-System-Level-Simulator-Rel-v1-9-Q2-2016”, and have checked the code about calculation of SINR in UE.m (line 491): “SINR_linear = RX_power ./ Interference_plus_noise_power;”. I have a question about the calculation of SINR.

In my opinion, SINR=S/(I+N). And S, I, N are all affected by the receiver antenna gain. But in the code, only S and I have considered receiver antenna gain; the noise N is calculated only by thermal noise density, bandwidth, and noise figure.

In addition, in the Dissertation http://publik.tuwien.ac.at/files/PubDat_226618.pdf Eq. (3.11), it seems that only S considers the effect of antenna gain; both I and N does not.

In general, my question is: Should we consider the effect of antenna gain for I (interference) and N (noise), when calculating SINR? I know this question maybe silly, but I am real confused about it. Hope you could help me. Thanks.

Best regards,
Yvan

[Martin Müller]

Dear Yvan,

in general, since this is a downlink simulator, we assume a UE at the receiver side that is assumed to have an omnidirectional antenna. Also in the disseration that you reference, only an antenna gain on the transmit-side is considered (for signal as well as interference). In general for the noise power, it is modelled independently from the antenna gain (which is a fair assumption in a cellular wireless comm. context).

Best regards,
Martin

[Yvan]

Dear Martin,

Thanks for your kind reply. Sorry for the typing error, the equation making me confused is Eq. (3.16) actually. In this equation, it seems that only S considers the effect of antenna gain; both I and N does not.

Best regards,
Yvan

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