Abstract
In this letter, we consider a distributed satellite MIMO scenario that includes two GEO satellites and a uniform linear array (ULA). The effect of geometrical arrangement of ULA on channel capacity is investigated, and it is proved that the optimal capacity can always be obtained as long as its antenna spacing is larger than a threshold. The closed-form expressions of this threshold and its asymptotic form are derived. Considering the threshold may be too large to satisfy when a low frequency is used or two satellites are close, the exact capacity reduction when the threshold cannot be satisfied is also analyzed, which can help to reach a compromise between capacity and antenna spacing.
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