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Posted by on Dec 18, 2012 in Technology |

100G: DARPA will develop radio links 100 Gbps

100G: DARPA will develop radio links 100 Gbps

Not long ago dedicate a few minutes to talk about the submarine cables , fiber optic large deployments linking five continents, supporting almost 90% of the network traffic Over the years, fiber optic networks have become the basis on which underpins many communications systems offering great transport capabilities and minimal degradation with the added advantage of covering large distances. However, this infrastructure requires large deployments and is not something you can carry and spread quickly, a handicap that also include military and communications equipment that is not always found in the satellite transmission networks they need. With the idea of improving military communications, DARPA launched the 100G project that aims to solve this problem by designing a new type of radio link to be able to offer 100 Gbps and therefore can compete with fiber optics.

In the same way that the operator networks and some corporate networks rely on a backbone (or core network) consisting of high capacity links (optical fiber using, for example, DWDM ), DARPA wants to develop a technology that allows you to deploy a backbone based on high capacity radio links (100 Gbps) and therefore without the optical fiber without loss in performance and with the added benefit of rapid deployment and the ability to move or expand their network without major civil works.

And what wants to develop a network such as 100G? 100G project requirements (which is as it’s called) are quite interesting because we are talking about large transmission capacity (100 Gbps) with the addition of a powerful, about 200 kilometers terrestrial radio communications and 100 km of range between ground-air communications. On this basis, would provide troops DARPA links low latency and high speed for a number of real-time applications (avoiding delays signal low capacity radio links and satellite communications and improving the currently 200-250Mbps offers its troops).

The most interesting is that DARPA 100G project seeks a solution based on radio links and, therefore, does not look as optical communications could be the laser links that lead the market in a few years since they require line of sight between transmitter and receiver in addition to not be immune to the weather, a crucial factor to meet the requirement of ground-to-air (and one can easily assimilate real time information sent by U.S. military drones).

Offering a capacity equivalent to the fiber optic carriers using radio requires a very efficient use of the available RF spectrum. [...] 100G aims to demonstrate how we can combine a higher order modulation and spatial multiplexing signal that allows us to obtain capacity 100 Gbps transmission equipment size, weight and power requirements that enable portability and deployment. We believe that these goals can be achieved as long as we get the convergence of the equipment manufacturers and communications technology base for defense

Obviously, the development of a transmission-reception equipment that can be deployed in the field is perhaps one of the most difficult points of the program to be put something manageable, both in magnitude and consumption. While laboratory testing has reached 2.5 Tbps links , the transmission conditions were ideal and the vain to cover was quite small (of the order of a few meters), a quite unrealistic scenarios compared with the requirements has DARPA set for the project.

With the idea of presenting the program to OEMs and develop a workable model of this new type of radio link, DARPA has called a conference where they will announce the program, the requirements and guidelines of this research and where also begin Gathering ideas and suggestions from the industry.

100G is a little less than fascinating project that led to civil, could contribute greatly to the development of next generation networks and accelerate infrastructure deployment.

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