Exact symbol error probability of orthogonal space-time block codes

Space-time block coding is a modulation scheme for the use of multiple transmit antennas providing a simple transmit diversity scheme with the same diversity order as maximal-ratio receiver combining. Using the equivalent single-input single-out (SISO) model, we present a closed-form expression for the exact symbol error rate (SER) of orthogonal space-time block codes (STBC) over flat Rayleigh fading channels.