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RF/Microwave??

Multicore boosts microwave transmission range

Posted: 14 Jun 2013 ?? ?Print Version ?Bookmark and Share

Keywords:Fibre-optic? microwave? multi-core radios? transmission links? network?

Halving the antenna size: The system-gain boost enabled by the multi-core radio can be leveraged to scale down the antenna size. A radio rule of thumb dictates that every doubling of antenna size on one side of the link translates into 6dB more link budget. The 19dB boost to system gain, as described in the example above, can be exploited to halve the antenna size (using 12dB of the 19dB gain) on each side of the link, still leaving 7dB which can be used to further reduce antenna size on either side. Smaller antennas cost less and require less space, so the network operator enjoys CAPEX savings from the multi-core deployment and OPEX savings due to lower tower-leasing fees.

Upgrading equipment in field
Single-core vs. multi-core: Multicore's advantages are exceptional when it comes to those inevitable future upgrades. Consider a very practical scenario: an operative 1+0 link in the field that must be upgraded to 2+0 in order to accommodate growing demand for capacity. Here is a comparison between upgrades in the case of single-core equipment vs. multi-core equipment.

Single-core equipment: The upgrade process of single-core equipment is complicated, time consuming and expensive. It involves:
???Purchasing a new radio
???Sending an installation team to the site
???Dismantling the existing radio
???Replacing the single-mount radio-antenna interface to accommodate two carriers (either a coupler in case of single polarisation, or an OMT if using XPIC)
???Re-installing the old radio together with the new one
???Connecting both radios to a switch to provide L2 LAG in order to obtain a 2+0 multi-carrier link

Multicore equipment: To ensure future upgradeability, network operators can initially install a multi-core system in single-core mode, providing enough capacity for today while ensuring the ability to expand capacity on the fly in the future. The multi-core system is initially installed as 1+0, the same as the single-core radio, but is always ready for 2+0. When the upgrade to 2+0 becomes necessary, the operator merely needs to:
???Remotely upload the license and activate the second core via the network management system

No site visits are required and there is virtually no downtime; subscribers enjoy continuous, uninterrupted service. No additional switch is needed since the system can perform N+0 Multi-Carrier Adaptive Bandwidth Control internally between its multiple cores, Ceragon's method for utilising the multi-channel capacity in a much more efficient manner than L2 LAG. The network operator enjoys much lower power consumption than 2+0 systems which are constructed from single-core radios, and site leasing fees do not increase since no additional hardware is installed.

Better, faster, stronger
Multicore radio technology delivers a new level in microwave capacityGb/s per second of radio throughput over a single frequency channel. Far less costly to deploy than fibre, multi-core microwave solutions solve today's network hauling challenges in the most cost-efficient manner. Inherently versatile, multi-core radios are suitable for a wide range of deployment scenarios and can be upgraded, by remote software definition, to deliver more capacity and longer link distance as dynamic deployment scenarios dictate. Multicore technology enables operators to enjoy significant capital and operational savings while future-proofing their networks for escalating capacity demands.

About the author
Ron Nadivis vice president of R&D at Ceragon Networks. He has over 20 years of experience in the telecommunication industry and has led a series of innovative designs in radio RF, modem, and Ethernet networking technologies. In the eight years prior to joining Ceragon, he worked for the Israeli Ministry of Defence in the Electronics Research Department as a research engineer and project manager, specialising in wireless communication systems. Ron holds a Bachelor's of Science degree in Electrical Engineering from the Tel-Aviv University (cum laude) and a Master's degree in Management Science (MBA) from Tel-Aviv University.

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