Simple models for multiplexing throughputs in open- and closed-loop MIMO systems with fixed modulation and coding for OTA applications

In this paper, we study the multiplexing throughputs of open- and closed-loop multiple-input multiple-output (MIMO) systems with fixed modulation and coding (i.e., fixed maximum data rate). For the open-loop case, we assume the simplest linear decoder, i.e., zero forcing (ZF). For the closed-loop case, we assume singular value decomposition (SVD). Using the threshold receiver model (accounting for the advanced coding), the throughput for either case can be readily obtained via simulations. MIMO antenna degradations such as correlation and imbalanced antenna efficiencies can be readily included in the developed throughput model. In addition to the usual presentation of the average throughput in a fading channel, we introduce the user-distributed detection probability of the (data) streams.