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In this paper, the downlink ergodic rate of distributed antenna systems (DASs) is studied with linear beamforming under pilot contamination. Utilizing Jensen's inequality and the properties of Gamma distribution, we derive a closed-form expression of the achievable rate with maximum ratio transmission (MRT) beamforming. Then, based on the approximation for non-isotropic vectors as well as the properties...
A novel dual-polarized omnidirectional ceiling antenna was proposed in this paper, including horizontal and vertical polarization. The vertical polarization adopt asymmetric biconical radiation element with ultra-wideband characteristic, having smart size for landscaping. The horizontal polarization adopt a ring array including five dipoles, produce horizontal omnidirectional radiation equivalent...
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