Do LTE physical layer need to use a SVD decomposition in case 4×4 antena structure.

Question

Since eNodeB can have information about channel quality with finer granularity through selected
subband CQI, wouldn’t it make sense to have MCSs defined on a per‐RB (or a group of RB) basis rather
than a single MCS per UE across all allocated RBs for a codeword?

Answer 1

Singular Value Decomposition (SVD) is one of the possible approaches for MIMO decoding (aka deprecoding).

Deprecoding takes place in the receiver chain which is not standardized and it’s up to vendor implementation. SVD may be used in LTE, but it’s neither not mandatory nor pointed in the specifications as an option.