Multiple—input multiple—output(MIMO)wireless technology in combination with orthogonal

frequency division multiplexing(OFDM)is all attractive air—interface solution for next—generation wideband

wireless networks．This paper provides all overview of the basics of MIMO —OFDM technology and focuses on

space—frequency signaling，receiver design，muhiuser systems，and hardware implementation aspects．We also

give the relevant open areas for further research．