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In this paper, the authors investigate the ergodic capacity for distributed antenna systems over Rayleigh fadings, including a distance-dependent pathloss model. Based on the proof of asymptotic normality, the mean and the variance of the instantaneous capacity were recently presented as a closed form solution, which includes a root of polynomials. However, this solution is too complicated to capture quantitative performance measures such as multiplexing gain and power offset. In this paper, they derive a simple and accurate expression for the ergodic capacity by utilizing the high Signal-to-Noise Ratio (SNR) analysis.
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