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In this paper, we study single cell multi-user downlink distributed antennasystems (DAS) where the antenna ports are geographically separated in a cell.First, we derive an expression of the ergodic sum rate for DAS in the presenceof pathloss. Then, we propose a transmission selection scheme based on thederived expressions to maximize the overall ergodic sum rate. Utilizing theknowledge of distance information from a user to each distributed antenna (DA)port, we consider the pairings of each DA port and its supporting user tooptimize the system performance. Then, we compute the ergodic sum rate forvarious transmission mode candidates and adopt a transmission selection schemewhich chooses the best mode maximizing the ergodic sum rate among the modecandidates. In our proposed scheme, the number of mode candidates are greatlyreduced compared to that of the ideal mode selection. Through Monte Carlosimulations, we will show the accuracy of our derivation for the ergodic sumrate expression. Moreover, simulation results with the pathloss modelingconfirm that the proposed transmission selection scheme produces the averagesum rate identical to the ideal mode selection with significantly reducedselection candidates.

Transmission Selection Schemes using Sum Rate Analysis in Distributed Antenna Systems