Patent ID: 8873585
Filing Date: 2014-10-28
Classification: H04B

Abstract:
1. A distributed antenna system comprising: a radio interface unit adapted to receive a plurality of downlink MIMO spatial streams from at least one base station for providing a multi-input, multi-output (MIMO) system, the radio interface unit including at least one mixer adapted for converting at least one of the plurality of downlink MIMO spatial streams from a native frequency band to a different, non-overlapping frequency band and a downlink duplexer adapted for combining each of the plurality of downlink MIMO spatial streams to form a combined downlink signal on to a common transmission medium; a base unit adapted to receive the combined downlink signal over the common transmission medium, and for transmitting the combined downlink signal to a plurality of remote units over a separate communication medium connecting the base unit to each remote unit; each remote unit among the plurality of remote units including a multiplexer adapted for connecting the remote unit with a plurality of antenna units and for transmitting the combined downlink signal to each of the antenna units over an a separate antenna unit communication medium connecting the remote unit to each antenna unit; each antenna unit including a de-duplexer adapted for separating the combined downlink signal into each of the plurality of downlink MIMO spatial streams and at least one downlink mixer adapted for converting each of the plurality of downlink MIMO spatial streams to the native frequency band; and a plurality of MIMO antennae coupled to each antenna unit, one for transmitting each of the plurality of downlink MIMO spatial streams.