In a Multi-User Multiple-Input Multiple-Output (MU-MIMO) system, the throughput depends on both the eigenvalues and the eigenspace alignment of the desired and the interference wireless channels. In this paper, a channel measurement campaign under a typical indoor environment is carried out, where five possible scenarios are taken into account. On the basis of measurement, fundamental trends about the ultimate performance of the MU-MIMO system is highlighted. Measurement results indicate that whether the desired transmitter and the interference transmitter are located in same cavity (e.g., room or corridor) impacts on the throughput of MU-MIMO transmission significantly due to common scatterers.