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 :
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 ?
I think that the MRC is
Hence, when one branch is not available, its channel estimate is 0.
Let say h2 is null, the equation reduces to:
Ok in other words, the system acts as Selection Combiner.
Yes, because this is the optimal way to behave in that case.