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In this paper, the uplink of a multi-user Distributed Antenna System (DAS) with antenna elements deployed on a circle is investigated. The authors address the problem of calculating the sum-rate capacity with per-user power constraints. Based on system scale-up, they derive a good approximation of the sum-rate capacity by adopting random matrix theory. They also propose an iterative method to calculate the unknown parameters in the approximation. The approximation is illustrated to be quite accurate and the iterative method is verified to be quite efficient by Monte Carlo simulations.
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