Practical diversity combining at receivers (Maximal Ratio Combining & Equal Gain Combining)
Since, in theory, it is assumed that long term average SNR and noise remain same across all branches, first, I configured my USRPs to have same noise levels and then placed them in a way that average SNR across both branches also remain the same.
Finally, simply combining them or first multiplying instantaneous SNR factor with each branch leads to EGC and MRC, respectively.