12.07.2015 Views

MIMO and Smart Antennas for Mobile Broadband ... - 4G Americas

MIMO and Smart Antennas for Mobile Broadband ... - 4G Americas

MIMO and Smart Antennas for Mobile Broadband ... - 4G Americas

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

Note that this is likely a general rule, that when co-located, the lower frequency antennas are tilteddown more than the high frequency antennas because the lower frequency antenna has a largervertical beam width <strong>and</strong> lower propagation loss. To keep intercell interference to the same level, thelower frequency antennas are typically tilted down toward the ground more than the higher frequencyantennas.Figure 23 – Tilt distribution <strong>for</strong> an operator’s deployment in a mixed urban/suburban environment showing a median of 3degrees of downtilt <strong>for</strong> the high frequency b<strong>and</strong> <strong>and</strong> 6 <strong>for</strong> the low frequency b<strong>and</strong>. 20% have no tilt.<strong>4G</strong> <strong>Americas</strong> <strong>MIMO</strong> <strong>and</strong> <strong>Smart</strong> <strong>Antennas</strong> <strong>for</strong> <strong>Mobile</strong> Systems – October 2012 – All Rights Reserved29

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!