General notes:
Copies of the papers presented at, or published for DCC are available in
various ways. A paper printed in the proceedings will be available for
purchase in most cases in hard copy as the DCC proceedings. It will in
most cases also be available as an individual paper in PDF format as a
free download via a link below the abstract (where available) It may
also be available on CD-ROM. A paper printed in the proceedings may not
have been presented at the conference. Also a presentation at DCC may
not be in the printed proceedings. In those cases it may be available
on DVD, CD-ROM or as a MP3 download. Links to what is available will be
on the page specific to the particular year's DCC.
The price for the TAPR and ARRL 31st Digital Communications Conference 2012 Proceedings is:
$ 20 US +applicable shipping/handling.
(Place Web Order)
(This link takes you to lulu.com)
- Location:
- Atlanta, GA
- Coordinators:
- Steve Bible, N7HPR,
Conference
Manager
ABSTRACTS:
31st ARRL and TAPR Digital Communications Conference
September 21-23, 2012
Experimenting with High-Speed Wireless Networking
in the 420 MHz Band
by
David Bern W2LNX
Abstract:
This paper reports on our testing the Doodle Labs DL435-30
and Xagyl Communications XC420M wireless networking
miniPCI cards. They behave like IEEE 802.11 wireless
networking cards but operate in the 420 MHz band. We have
successfully tested these cards over 10 miles at about three
Mbit/s data rate at a 5 MHz bandwidth in the 420 to 426 MHz
ATV sub-band. Our test applications were a Webcam video
streaming program and a file download server program that
ran on inexpensive netbook computers.
Proceedings
Paper
DATVexpress - Project Testing Update
by
Charles Brain G4GUO
and
Ken Konechy W6HHC
Abstract:
The DATV-Express project was formed to create low-cost solution for
Digital-ATV
transmission. The open-source project was first announced and described
at the
TAPR Digital Communications Conference (DCC) in 2011.
This DCC 2012 presentation in the proceedings provides an update on the
project
progress. The project's hardware board design appears to have the
capability to
go well beyond just DVB-S transmission, it should be able to transmit
any waveform
of up to 8 MHz bandwidth using SDR techniques...including DVB-T, DVB-S2
and ATSC
.
Proceedings
Slides
(PDF)
Presentation
Slides
On-line Alternation of Modulation Techniques using
a Dynamic
Switch
by
Shashank Gaur
and
Sankalp Agarwal
and
Ammar Almasri
and
Anas Bennani
Abstract:
In the ongoing era, the need of wireless communication is increasing at
an exponential rate, alongside the development requirement is also
rising in order to provide efficient, uninterruptable and effective
services all around the globe. We propose an intelligent system, which
would be able to switch inbetween, the modulation techniques during
online transmission in order to communicate with the surrounding
environment and to provide efficient SNR and throughput.
Proceedings Paper
aprsc, an open-source high-performance APRS-IS core
server
by
Heikki Hannikainen
OH7LZB
Abstract:
aprsc is a high-performance, open-source APRS-IS server software for
Unix-like systems such as Linux, FreeBSD, Solaris and Mac OS X. This
paper documents its main features, design, some implementation details
and results of performance measurements.
Proceedings Paper
Technical aspects of Lentus (4.21.1) and use
by
Patrick Lindecker
F6CTE
Abstract:
This new mode benefits from the fact that it is nowadays quite easy to
synchronize a computer with reference clocks, through an automatic WEB
communication. A precision of 50 ms is easy to get with WEB time
servers. So if the symbol length is sufficiently large (>2 seconds), the
relative precision is quite good. Consequently, the symbol
synchronization is done directly through programmed times, without need
to extract synchronization from the signal itself, as it is done in the
majority of modes (PSK31 for example). This permits a gain in term of
minimum S/N ratio and to increase the robustness of the transmission.
The goal of this mode is to perform VLF to HF communications at a very
low S/N ratio (-34 dB with anoise bandwidth of 3 KHz).
Proceedings Paper
YAAC: The Development of "Yet Another APRS Client",
an Open-Source Cross-Platform Application
by
Andrew Pavlin KA2DDO
Abstract:
Of the many APRS clients currently available, all of them have some
limitations or constraints. YAAC (Yet Another APRS Client) was designed
and implemented to meet the author's needs and hopefully some
unfulfilled desires of the Amateur Radio community, while also being a
personal research projectin the grand old Amateur Radio tradition of
home-brewing.
Proceedings
Paper
Digital Amateur Radio in Support of Situational
Awareness, Common Operating Picture and Community Resilience for 21st
Century Emergency Communications
by
Aleksandra M. Rohde, W3JAG
Abstract:
The Department of Homeland Security has identified core capabilities
necessary for rapid and effective response to man-made or natural
emergencies. These include: (1) collecting real-time situational
awareness of the emergency; (2) developing a common operating picture;
and (3) building resilient communities capable of effectively adapting
to changing circumstances. Amateur Radio operators -- particularly
those who are digital radio enthusiasts in wireless networking -- are ideally
suited to help develop these core capabilities through current and
future technologies.
Proceedings Paper
Web Servers on the HSMM-Mesh
by
Joesph P. Scanlan N7XSD
Abstract:
Here we demonstrate the practicality of ptoviding web servers on the
HSMM-Mesh. The first example shows a standalone server connected to its
own Mesh node. In the second example, the Mesh node is added to an
existing network that has servers on its private and perimeter
sub-networks,
Proceedings Paper
MDSR TX Compliance and RX Performance Testing
by
Alex Schwarz VE7DXW
and
Adam Farson VA7OJ/AB4OJ
Abstract:
The RX section of the Modulator-Demodulator-Software- Radio (MDSR) has
been published in the last 2 years of the TAPR show and most recently
in the July 2012 issue of the QST magazine. This document describes the
hardware and the software of the TX section of the MDSR development. The
TX section has been tested with the help of Adam Farson (VA7OJ/AB4OJ) in
his RF test lab. The RX section has also been tested and compared with
amateur radio transceivers that Adam had previously tested.
Proceedings Paper
MDSR Additional Feature released with V2.4
Software
by
Alex Schwarz VE7DXW
and
Guy Roels ON6MU
Abstract:
The Arduino Frequency Counter Windows software program has been designed
primarily for use with the Arduino chip and the Arduino C controller
software. In addition to being used with the Arduino chip and the
Arduino C controller software, the Arduino Frequency Counter can also be
used in conjunction with the MDSR software to display the measured
frequency in the MDSR
Proceedings Paper
Is the unlicensed band "good enough" to deploy
a muni-Wi-Fi network without mesh infrastructure?
by
Devabhaktuni
SriKrishna
and
Rajeev
Krishnamoorthy
Abstract:
We explore a municipal mesh networking architecture called SocialMesh
that can be built entire.ly from end-user devices (analogous to amateur
radio,
HAM, and CB-radio). without requiring dedicated infrastructure mesh
nodes,
cell base stations, or spectrum licenses. Compared to using Wi-Fi for
mesh
backhaul, our estimates show it may be possible to achieve up to 10x
more
coverage area and reliability, and operate 10x faster using SocialMesh
to
backhaul Wi-Fi client connections. This implies a minimum end-user
device
density of a few per square mile or less and it can scale up to support
much
higher densities of several thousand per square mite. This is ideat for
increasing the connection probability in challenging RF environments,
and
extending battery life for handheld devices by an estimated factor of
1Ox.
Open design specifications for Social Mesh will be updated at
http://www.sogatmesb.org. Question to members of the amateur radio
community:
"Is there any experience and lessons learned from the operation of
global and
wide-area amateur radio networks that may be applied to the unlicensed
band
infrastructureless network?" Please contact the authors with your advice
and suggestions.
Proceedings
Paper
Design of a Practical Handheld Software Radio
by
Chris Testa KD2BMH
Abstract:
We've stood on the precipice of the software radio revolution for
many
years. However, these devices still only sit in expensive commercial and
military applications. State of the art radios use power-hungry SRAM
based
FPGAs that demand fast interconnects to host processors operating under
heavy loads. These devices lack the capability of low-power operation
which barrs wide scale deployment. A new architecture is presented for
the
software radio, using a Flash based FPGA to enable true low power
operation.
Duty cycling is possible since the FPGA, processor, and radio front ends
can all be shut off. An integrated hard ARM Cortex-M3 on the same die as
the FPGA allows for rapid and efficient communication over an on chip
AHB-Lite interface. Linux runs on top of the ARM, enabling robust
networking
tasks from a battery operated software radio.
Proceedings
Paper
A High-Performance Sound-Card AX.25 Modem
by
Sivan Toledo 4X6IZ
Abstract:
This article describes the problems with current AX.25 software modems,
the design
methodology I followed in implementing the new modem, and of course, the
resulting
software. The methodology is particularly important; it has allowed me
to design and
implement a high-performance modem with little background in digital
processing and
absolutely no background or experience in designing digital decoders.
Proceedings Paper
Programmable PLL (Si570) Local Oscillator for HF
Receivers,
Transmitters and Tranceivers
by
Craig Johnson AA0ZZ
Abstract:
A new product has recently been developed by Silicon Labs, the Si570
DSPLL
programmable frequency synthesizer, and it has great potential for use
in many Amateur
Radio applications. The PLL synthesizer is one good example. In this
paper we will
explore some possible uses.
Presentation
PDF
A Simple Internet VoIP Board
by
Bob Simmons WB6EYV
Abstract:
This article describes a full duplex Internet audio board (a
VoIP board) using a PIC microcomputer and a Lantronix XPORT
Ethernet module. A pair of these boards will provide a full duplex
Internet audio link. This board sends and receives (approximately) 16
user datagram protocol (UDP) packets per second, with 512 payload bytes
per packet. Each payload byte expresses an 8 bit audio sample,
taken 8000 times per second.
Presentation Slides
DVDs of the presentations at the 31st DCC are available:
Videos and DVDs are available at www.ARVN.tv.
