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Explanation about MRC behavior when one branch fails to detect the signal

Started by cogwsn 4 years ago3 replieslatest reply 4 years ago80 views

I am working on hardware implementation of Maximal Ratio Combiner for OFDM based system. 

Consider a two antenna receiver performing MRC over received signals y1 and y2 on antennas 1 and 2 respectively.  Ideally the MRC should combine both the antenna branch signals as follows : 

screenshot from 2018-09-24 18-04-08_957.

where h1 and h2 are the respective channel estimates. 

What should be the behavior of MRC when one of the antenna is not able to detect frame and hence h , i.e., channel estimate for that branch is not available ? 

Regards

Sumit 

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Reply by oliviertSeptember 24, 2018

Hi Sumit,


I think that the MRC is

image_018_3220.jpg

Hence, when one branch is not available, its channel estimate is 0.

Let say h2 is null, the equation reduces to:

image_020_39203.jpg


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Reply by cogwsnSeptember 24, 2018

Ok in other words, the system acts as Selection Combiner. 


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Reply by oliviertSeptember 24, 2018

Yes, because this is the optimal way to behave in that case.