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Field experiments of LTE-Advanced-based 8×8 multiuser MIMO system with vector perturbation

We have developed an LTE-Advanced-based 8 × 8 multiuser MIMO experimental system with vector perturbation to overcome performance degradation of the MIMO technique under spatially correlated channel conditions, such as a line-of-sight (LoS) environment. This paper introduces our experimental system and shows results of outdoor/indoor experiments envisioning small-cell environments. Through experimental evaluation, it is confirmed that the throughput of the downlink transmission with vector perturbation reaches almost double that with MMSE spatial filtering.