KB6NU's Ham Radio Blog

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Items from my inbox: SDR, coax connectors, deployable networks

Posted: 16 May 2016 11:49 AM PDT
http://feedproxy.google.com/~r/kb6nu...m_medium=email

I get a lot of e-mail newsletterstoo many really. I get newsletters from a
number of trade magazines, professional societies, LinkedIn, and other
sources. A lot of these have items of interest to amateur radio operators.
Here are a couple of those itemsDan

Researchers advance software-defined radio technologyÂ*

University of Electro-Communications (Japan), 12/29/15

Japanese researchers from the University of Electro-Communications have
developed the Appliance Defined Ubiquitous Network (ADUN) to deliver
unlimited broadband radio-wave information to clients via a distribution
server. The researchers built the networks by implementing virtualized
wireless transceivers using cloud computing and the broadband Internet.
During testing, the researchers found ADUN worked effectively as a
scale-out solution to deliver radio space information, but large numbers of
clients receiving information at any one time was limited by the number of
physical central processing units (CPUs) in the distribution server. The
researchers learned a CPU is needed for each client, and adding logical
CPUs made little difference to performance. The researchers note this field
of software-defined radio (SDR) technology has potential in future
cognitive radio systems, as SDRs can comply with various wireless protocols
without hardware modification. In addition, it may be possible to both
virtualize the wireless transceiver and compensate for the instability of
the wireless protocol on the receiving end, as well as to automatically
launch the wireless transceiver corresponding to the signal. The
researchers findings have implications for the development of global
networks of distribution servers that can deliver unlimited radio data to
multiple clients at the same time, because limitations lie within the
hardware instead of software.Â*View Full Article
What are the differences between coaxial connectors?

Microwaves and RF,Â*5/2/16

Although often taken for granted, coaxial connectors are a key aspect of
any RF/microwave application. While they may receive less attention than
other components, connectors nonetheless must provide adequate performance
to avoid any system degradations. Therefore, anyone tasked with selecting
coaxial connectors for any given application should clearly understand the
parameters that define connector performance.

Bringing movable and deployable networks to disaster areas: development and
field test of MDRU.Â*

IEEE Networks, Volume 30, Issue 1, January 25, 2016

Communication demand is paramount for disaster-affected people to confirm
safety, seek help, and gather evacuation information. However, the
communication infrastructure is likely to be crippled due to a natural
disaster, which makes disaster response excruciatingly difficult. Although
traditional approaches can partially fulfill the most important
requirements from the user perspective, including prompt deployment, high
capacity, large coverage, useful disaster-time application, and
carrier-free usability, a complete solution that provides all those
features is still required. Our collaborative research and development
group has developed the Movable and Deployable Resource Unit, which is
referred to as the MDRU and has been proven to have all those required
features. Via extensive field tests using a compact version of an MDRU
(i.e., the van-type MDRU), we verify the effectiveness of the MDRU-based
disaster recovery network. Moreover, we demonstrate the further improvement
of the MDRUs performance when it is complemented by other technologies such
as relay-by-smartphone or satellites.

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