GEDOMIS: a broadband wireless MIMO-OFDM testbed, design and implementation

We present an experimental broadband wireless 4times4 multiple-input multiple-output (MIMO) OFDM system operating at two well-known WLAN frequency bands: 2.4 GHz and 5.2 GHz. The demonstrator is described placing special emphasis, both at the RF and DSP levels, on the design of a reconfigurable hardware architecture. In the RF section, a new scheme for the design of custom, area-efficient multi-antenna multiband radios is presented. At the DSP level, we describe the synchronization and channel estimation algorithms that may be used in scenarios with multiple transmit antennas. These algorithms take advantage of the cyclic delay diversity (CDD) mechanisms that are currently being proposed for the new IEEE 802.11n standard