I have confusion on MRC(Maximal Ratio Combining) method which I would like to clarify. An example is where I have 1 transmit antenna and 4 receive antennas. The concept of MRC is to combine all the signal from 4 receive antennas such that the combined SNR is increased (given the phase is corrected).
Once the MRC process is completed, are we required to equalize the channel effect with some equalizer (for e.g. ZF or MMSE). Most of the online materials refers MRC as a equalizer, which made me confuse.
If we require to use an equalizer after combining, which channel coefficient should we use ? Because once the received symbols are combines, we just have a vector (with increased SNR). But the channel coefficients are different between 1 tx antenna and each 4 rx antenna.