An Iterative Receiver with Channel Estimation for MIMO-OFDM Over a Time and Frequency Dispersive Fading Channel

A joint iterative channel estimation and data detection receiver is proposed in this paper for multiple-input- multiple-output orthogonal frequency deivision multiplexing (MIMO-OFDM) system, which employs two mandatory MIMO profiles as in IEEE 802.16e MIMO mobile WiMAX system, namely Alamouti space time coding (STC) and spatial multiplexing (SM), over time and frequency dispersive fading channel. A novel channel estimator with time-domain and frequency-domain combining of channel estimates from preamble/pilot/soft decoded data information is proposed and integrated with maximum ratio combining (MRC) data detector and co-antenna interference canceler (IC) for STC system and SM system respectively. Numerical results show that the proposed receiver has 2dB gain compared to conventional non-iterative receivers in pedestrian low mobility condition and more than 6dB gain in vehicular high Doppler environment.