Abstract
In this paper, we use a series expansion to calculate the sum-capacity
of a massive Multiple-Input MultipleOutput (MIMO) system under
propagation environment described by a dominant line-of-sight. The
sum-capacity is written as Taylor’s series where each term is a function
of the mean trace of k-th power of the channel matrix W. We analytically
derive the mean trace of first, second, third, and fourth moments of W.
Although the series is infinite, our numerical results show that only a
few terms can tightly approximate the exact sum capacity. Numerical
results corroborate our analytical expressions.