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Impact of antenna spacing at terminals on spatial variation of performances in distributed antenna systems

This paper investigates the impact of antenna spacing at terminals on the performance of the distributed antenna system (DAS) in outdoor environments in higher frequency bands (above 6 GHz), where the line-of-sight propagation plays the most important role. We choose the channel matrix condition number as the evaluation criterion of performances and focus on it in simulations and practical tests. The simulation reveals the relationship between the scale of antenna spacing and spatial variation of the channel condition number. The larger the scale is, the more quickly the channel condition number varies with terminals moving. And it is also found that a small channel condition number can be obtained even when multiple antennas of a terminal are located very close to each other. In addition, outdoor experimental results are provided to support our analysis. These contribute to the design of terminals’ multiantenna.