Space-Time-Frequency Coded MIMO-OFDM System: Achieving Full-Diversity Invariant to Channel Variations

Most of the existing MIMO and MIMO-OFDM code designs are able to achieve full diversity over a special channel scenario (quasi-static/fast fading in time or frequency), but need to be re-designed over any other. In this paper, full rate and full diversity space-time-frequency (STF) codes with linear decoding complexity are proposed. Besides, the proposed codes can also exploit the maximum achievable diversity when wireless channels become frequency and/or time non-selective fading because of the changing of the surrounding scatterers distribution and/or the stationarity of the mobile, without altering the code structures. Simulation results for two transmit antennas over the COST-207 6-ray Typical Urban (TU) channel model are presented to support the code designs