Combining beamforming and spatio-temporal coding in macrocell channels with known transmit matrix correlation

This article proposes a novel method to fully exploit the diversity gain of a system with multiple antenna elements at the transmitter and receiver in the downlink of a single user macrocell scenario including important effects of the channel as frequency selectivity and spatial correlation. The scheme obtained is composed of an eigen beam former, a power loading algorithm, an Orthogonal Space-Time Block Code (OSTBC) and a pre-delayer, which combined extract the maximum spatial and multipath diversity of the system. A geometrically based stochastic channel model is used to evaluate the performance of the system. Simulation and analytical results are presented comparing the performance of the proposed system with previous schemes. Finally results regarding the impact of physical parameters of the channel in the system are also included.