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<span style="font-size: 20px; font-weight: bold;
color: rgb(0, 0, 0); font-family: arial;
line-height: 110%;">OPLIN 4Cast #306: Another
wireless advance</span><br>
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<span style="font-size: 11px; font-weight: normal;
color: rgb(102, 102, 102); font-style: italic;
font-family: arial;">October 31st, 2012</span></p>
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<p style="text-align: justify;font-size: 16px;
font-family: arial; line-height: 110%;"><img
class="alignleft wp-image-3196" title="wireless
advance"
src="cid:part4.02090805.03090405@oplin.org"
alt="" height="124" width="120">We try to mix it
up when we choose subjects for the <em>4cast</em>,
but here we are talking again about a topic we
featured just <a
href="http://www.oplin.org/4cast/index.php/?p=3145">2
weeks ago</a>. At that time, we thought the
promises of "5G" wireless were pretty significant,
but since then some major universities have
released news that could really boost wireless
networks, although details are currently sparse
due to nondisclosure agreements. Researchers from
these American and European universities claim
that they can increase wireless bandwidth
tremendously with no need to replace equipment;
they do it by handling the problem of dropped data
packets in a new way.
</p>
<div> </div>
<ul style="text-align: left;">
<li style="text-align: justify; font-size: 16px;
font-family: arial; line-height: 110%;"><a
href="http://www.i-programmer.info/news/181-algorithms/4992-network-coding-speeds-up-wireless-by-1000.html">Network
coding speeds up wireless by 1000%</a>
(i-programmer/Mike James) "TCP [Transmission
Control Protocol] isn't a good protocol for an
unreliable channel. It sends packets one at a
time and relies on the receiver to acknowledge
them. If any packets go missing then the
receiver signals this and the transmitter sends
the packet again. Over wired connections this
works reasonably well because few packets are
lost and the problem is usually network
congestion for which slowing things down tends
to help. However, over wireless networks,
especially phone networks, packet loss is
common. What happens in this case is that the
network capacity is wasted in resending packets
and in the handshaking needed to request a
resend."</li>
<li style="text-align: justify; font-size: 16px;
font-family: arial; line-height: 110%;"><a
href="http://www.extremetech.com/computing/138424-increasing-wireless-network-speed-by-1000-by-replacing-packets-with-algebra">Increasing
wireless network speed by 1000%, by replacing
packets with algebra</a>
(ExtremeTech/Sebastian Anthony) "With coded TCP,
blocks of packets are clumped together and then
transformed into algebraic equations that
describe the packets. If part of the message is
lost, the receiver can solve the equation to
derive the missing data. The process of solving
the equations is 'simple and linear,' meaning it
doesn't require much processing on behalf of the
router/smartphone/laptop."</li>
<li style="text-align: justify; font-size: 16px;
font-family: arial; line-height: 110%;"><a
href="http://www.technologyreview.com/news/429722/a-bandwidth-breakthrough/">A
bandwidth breakthrough</a> (MIT Technology
Review/David Talbot) "Testing the system on
Wi-Fi networks at MIT, where 2 percent of
packets are typically lost, Medard's group found
that a normal bandwidth of one megabit per
second was boosted to 16 megabits per second. In
a circumstance where losses were 5
percent-common on a fast-moving train-the method
boosted bandwidth from 0.5 megabits per second
to 13.5 megabits per second."</li>
<li style="text-align: justify; font-size: 16px;
font-family: arial; line-height: 110%;"><a
href="http://www.geekosystem.com/algebra-wi-fi-faster/">A
bit of algebra makes Wi-Fi go much faster</a>
(Geekosystem/James Plafke) "There's no timetable
for this technology to be gifted to the Wi-Fi
world, but an estimate of two or three years was
bandied about. At the rate Internet speeds are
climbing nowadays, though, who knows where our
standard speed will be by then, and who knows
how much this technology will be able to boost
that."</li>
</ul>
<div style="text-align: left;"> </div>
<p style="text-align: left; font-size: 20px;
font-family: arial; line-height: 110%;"><small><strong><em>Packet
fact:</em></strong></small><br>
</p>
<div style="text-align: justify; font-size: 16px;
font-family: arial; line-height: 110%;">TCP
packets vary in size depending on the type of data
they are transmitting, but the most common sizes
for Internet TCP packets range from about 400 to
600 bytes. So it would take about 100 average-size
packets to transmit the typical <em>oplin.org/4cast</em>
web page (around 57,000 bytes).
</div>
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