A study on a multi-user single-carrier E-SDM scheme in wideband transmissions

Multi-user multiple-input multiple-output (MU-MIMO) systems in which signals are simultaneously transmitted from a base station to multiple users are well known as a method to improve the throughput performance. In MU-MIMO systems, the block diagonalization scheme is used to eliminate inter-user interference and the eigenbeam-space division multiplexing (E-SDM) technique is used for channel capacity maximization. In this paper, a multi-user single-carrier E-SDM scheme in wideband transmissions is formulated. The transmit and receive weights are obtained in the frequency domain. The receive weights are based on the zero-forcing method, which simultaneously operates on the spatial domain processing and frequency domain equalization. Then, the bit error rate performance is evaluated using computer simulations.