Decoupling matrix with rate one Quasi-Orthogonal STBC for eight transmit antennas

In this paper, we propose a numerical formulation of decoupling matrix with rate one Quasi-Orthogonal Space-Time Block Code (QOSTBC) for eight transmit antennas. Tirkkonen et al. provided zero-forcing decoupling matrix for eliminating Inter-Symbol Interference (ISI) in QOSTBC with 4 transmit antennas. We expand zero-forcing decoupling matrix with 8 transmit antennas, and also MMSE decoupling matrix with 4, 8 transmit antennas. Simulation results were provided to demonstrate that some SNR gains can be achieved by using decoupling matrix.