Received a comment from the reviewer for my research paper.
"Why SINR is used rather than CINR? CINR is good for MIMO."
I used SINR for all my mathematical model. Don't know how to answer him.. please anyone can help
Dear Faisan,
For wireless channels, it is more convenient to use the the carrier power rather than the signal power. The signal power is normally intended for power in the base band signal or the modulating signal. So, carrier power is modulated signal power.
In wireless system it is so that the transmitted symbols will be a piece of waveforms of the carrier having different amplitudes or frequency or phase or combination of them for digital modulation techniques. These modulated carrier systems will be contaminated by electromagnetic interference from the other symbols or from themselves in case of multipath interference in the wireless channels. In addition to that they will be contaminated by the white noise of the receiver. So, in the constellation diagram, we have represent the symbols as vectors super imposed on them the interference and the noise.
The best point for such representation is the input at the wireless receiver where the carrier power will be lowest and the equivalent input noise and interference will be highest.
So, It is a matter of definition. You have to tell how would you calculated the signal power?. The carrier power is equal to the square of its amplitude/2 as the carrier is considered a sinusoidal wave.
And do not forget that your emitted symbols are in form of pieces of sinusoids as i explained before.
In wireless channels the interference is occuring at the carrier frequency and therefore the reviewer stated that it is better to speak about carrier to interference plus noise ration.
Best wishes
For MIMO system, the best bet to use is CINR with different ranges and conditions that describe such scenario(There are lots of literature on this---check MEO ,LEO and satellite and terrestrial papers.However,for SIMO and other systems apart from MIMO,use SINR which relates the channel capacity to bandwidth----shannon theorem.
Hope it helps.
Best regards,
L.
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