Orthogonal space-time discrete multitone and space-time filtered multitone coded architectures

We describe several space-time multitone architectures for transmission with multiple antennas over flat and frequency selective fading channels. The idea behind these schemes is to perform data multiplexing over both the spatial and frequency domains. Two of these architectures are obtained by extending the filtered multitone (FMT) modulation concept to the multiple antenna scenario. Another novel architecture is based on the concept of deploying some form of cyclically prefixed discrete multitone (DMT) modulation. The architectures aim at orthogonalizing the time dispersive channel, and possibly the overlapping spatial channels. The efficient implementation can be performed via fast Fourier transform (FFT), and low rate polyphase filtering. These architectures can be concatenated with outer channel coding or data spreading for space-frequency diversity exploitation.