Introduction Multiple-Input Multiple-Output (MIMO) techniques have emerged as a key technology for the next wireless communication systems because these techniques enable very high data rate transmission using a limited frequency band. For this reason, implementation studies were conducted in order to build a practical MIMO system  ; however, a mainstay system configuration has not yet been determined. Because MIMO techniques add a new special dimension to the currently used time, frequency, and code multiple transmission technologies, optimization of many system parameters in each environment is very complicated. Therefore, we focused on an indoor asymmetric MIMO-OFDM wireless LAN system with a small mobile terminal (MT) and aim at a practical system construction by mainly applying the proposed experimental equipment. To actualize the system, we have studied the technologies based on Eigenmode-Space Division Multiplexing (E-SDM)  scheme because it provides the theoretical maximum channel capacity and a reduction in the MT calculation load. This paper proposes beamforming and antenna design techniques that improve hardware implementation and describes the experimental equipment that comprises the wideband asymmetric MIMO-OFDM system.