Adaptive Antenna Grouping Algorithm with Spacemultiplexed STBC in WiBro System

Space-Multiplexed(SM) space-time block code(STBC) can provide a good trade off between the spatial-multiplexing and diversity gains.This paper proposes an antenna grouping scheme for SM-STBC in Wireless Broadband(WiBro) system,which adaptively selects the group of two antennas within one STBC encoder before spatial multiplexing.The optimal grouping can be based not only on maximizing the minimal post signal-to-noise ratio(SNR) per subcarrier but also on maximizing the average mutual information on the whole bandwidth. Simulation results demonstrate that the system performance can be improved by the proposed adaptive antenna grouping schemes in this paper.