Super-orthogonal and super-quasi-orthogonal space-time trellis coding is seamlessly combined with orthogonal frequency division multiplexing (OFDM) to improve the performance of broadband wireless mobile communication systems. Quadrature amplitude modulation (QAM) is used on all OFDM subchannels. The transmitter is equipped with two antennas when using super-orthogonal space-time trellis codes (SOSTTCs). When the transmitter is equipped with four antennas, super-quasiorthogonal space-time trellis codes (SQOSTTCs) are used. The receiver first acquires the channel state information (CSI) and then decodes each OFDM frame using the Viterbi algorithm. We perform system simulations using a multiple-input multipleoutput (MIMO) Rayleigh fading channel model.

Keywords: MIMO wireless systems, Orthogonal frequency-division multiplexing, Super-orthogonal and super-quasi-orthogonal space-time trellis codes