Now with the advent of LTE at 700MHz DAS will have to support MIMO. This increases not only the link budget,(splitters, combiners, extra coaxial cable) but also additive of twice the coaxial infrastructure and twice the number of antennas. As the move to 4G is here and coming, this it seems is like the correct natural evolution of DAS design for healthcare. Support of the 4G I-Phone will drive this.  Then the question comes how will now a Distributed Antenna System support the LTE requirements for MIMO, but any such capability for 802.11n (where MIMO is also required.)?  Seems to me, that it is best to have the DAS support 4G requirements and provide 802.11n as discrete in the WLAN side of things. Then MIMO for LTE is dedicated to 700MHz and MIMO for 802.11n is dedicated to WLAN. There is certainly increased costs for adding 700MHZ LTE to a DAS to move it from a non-diversity basis to MIMO. Separate designs 4G LTE and 802.11n seem to provide the best price/performance outcome.

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