The Limitations of the Legacy Distributed Antenna Systems in the 5G Era

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3Q 2020 | IN-5917


The Limitations of the Legacy DAS Systems


In the 5G era, many legacy Distributed Antenna Systems (DAS) are facing several limitations to incorporate 5G and increase the overall capacity of the system. These limitations are mainly associated with two factors: the new frequency bands in which 5G typically operates and the major infrastructure works needed to increase the capacity of the system. Some of these limitations can be described as follows:

  • The frequency range of legacy passive components span from 700 MHz to 3 GHz. Thus, if an upgrade to incorporate 5G in 3.5 GHz is required, all passive components for main and Multiple Input, Multiple Output (MIMO) channels will require replacement to comply with the new frequency range.
  • A redesign and additional installation work will be required in order to provide blanket coverage in the 3.5 GHz band, since propagation conditions are very different compared to lower frequencies.
  • Major upgrade works involve new active equipment, passive components, cabling infrastructure, and antenna swap. In addition, a dedicated link budget analysis will typically need to be carr…

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