Space-time coding with increased diversity

This paper presents a method for constructing space-time block codes for multiple-input multiple-output (MIMO) Rayleigh fading channels. It employs orthogonal designs combined with the so-called diversity transform. Orthogonal designs provide the maximum diversity order for a given number of transmit and receive antennas. The diversity transform relies on unitary transforms that increase the channel alphabet; it does not alter the distance between input sequences, nor the bandwidth or information rate. A scheme of high diversity gain is tailored for any antenna array and signal constellation. Simulation results reveal that this scheme attains higher coding gains than other results known in the art.