Signal Processing in Spatial Multiplexing MIMO Communications

An apparatus comprising:

• at least one processor, and
• at least one non-transitory memory comprising a computer program code, wherein the at least one processor, the at least one memory, and the computer program code are configured to cause the apparatus to:
• arrange information to be transmitted to a receiver, to a plurality of spatial layers where each spatial layer is associated with a unique precoding configuration amongst the plurality of spatial layers, wherein the information comprises at least one signal that is identical in a plurality of the plurality of spatial layers;
• perform a decorrelation operation across the plurality of spatial layers such that the at least one signal in one of the plurality of spatial layers becomes decorrelated with the at least one signal in another one of the plurality of spatial layers;
• and
• cause transmission of a transmission signal comprising the information in the plurality of spatial layers to the receiver.

A non-transitory program storage device readable by an apparatus, tangibly embodying a program of instructions executable by the apparatus for performing operations, the operations comprising:

• arranging, in the apparatus, information to be transmitted to a receiver, to a plurality of spatial layers where each spatial layer is associated with a unique precoding configuration amongst the plurality of spatial layers wherein the information comprises at least one signal that is identical in a plurality of the plurality of spatial layers;
• performing, in the apparatus, a decorrelation operation across the plurality of spatial layers such that the at least one signal in one of the plurality of spatial layers becomes decorrelated with the at least one signal in another one of the plurality of spatial layers;
• and
• causing, in the apparatus, transmission of a transmission signal comprising the information in the plurality of spatial layers to the receiver.