A collection of
exceptional resources that will prove useful in
your spread spectrum and other wireless projects,
ranging from spread spectrum & CDMA
tutorials, theory, and circuit diagrams, to
development tools, OEM products, and consultants.
Note that we welcome new resource
submissions.
How
"The Bad Boy Of Music" And
"The Most Beautiful Girl In The
World" Catalyzed A Wireless
Revolution--In 1941
Would
you believe that spread-spectrum radio
technology was co-invented and patented
by a glamorous Hollywood starlet during
World War II? Read the complete
fascinating story here!
This
take on the Lamarr/Antheil story includes
biographies and a generous number of
photos of the inventors of spread
spectrum. And, as a bonus, photos of the
complete patent are presented.
Make a
name for yourself (or a colleague) in the
Spread Spectrum & CDMA industry! Be
the next to have your online article
memorialized in this section. Submit today!
This
well written, easy-to-understand tutorial
is geared more toward for the curious and
hobbyist than the seasoned engineer. It
provides a good understanding of the
benefits of digital spread spectrum, and
the magic behind it, without getting
bogged down in theory and math. As a
bonus, it includes a couple actual
photographs of SS frequency spectra,
something not offered by other tutorials.
While
the focus of this tutorial is on CDMA
technology, it covers a broad range of
general spread spectrum topics in order
to form a solid foundation of
understanding. The site uses frames,
which allows for fast and easy navigation
through a well organized table of
contents. While rich in useful tables and
illustrations, note that you must click
on icons in order to actually load
graphics for viewing. (Note also that the
reprint has been cleaned up a bit and may
be easier to use than the original.)
This
tutorial also covers the more eclectic
subjects of complex modulation, the
near/far problem, rake filtering, and
pilot codes.
This is
a fantastic summary that covers most
aspects of spread spectrum, and includes
plenty of graphs and block diagrams to
help in learning the technology. It come
complete with a table of contents, so
it's easy to find precisely what you're
looking for. But really, it pretty easy
reading for most engineers, so you might
choose to read the whole document (30
pages). The one thing this paper covers
that most others miss is a detailed
explanation of the generation of PN
sequences and the properties of these
sequences.
The
best CDMA One (IS-95) tutorial we've
encountered, this white paper offers a
complete technical overview of the IS-95
standard, including considerations of
capacity and coverage so important to
CDMA, the near-far problem,
multipath fading, and much more. The
article is appropriate for those with a
technical background but unfamiliar with
spread spectrum in general or CDMA in
particular. Lots of graphics, just a
little math.
Note:
This document is currently unavailable at
its original URL. It has reportedly been
included in a new book on CDMA. You might
consider doing a search for the title at
Google.com to see if it has re-posted
somewhere on the Web.
This is
is one of the best CDMA One (IS-95) and
cdma2000 tutorials we have encountered,
in terms of offering not only a general
outline and history of the systems, but
also detailed block diagrams and
explanations of how the two systems work.
The article is so easy to read, yet so
comprehensive, that we have included it
in both the Primers and Advance Topics
sections of our Spread Spectrum Resources
directory. However, it is best suited for
those who already have a basic
understanding of spread spectrum and CDMA
principles.
Jay
Fitzsummons, Troy Morris, Tony
Parezanovic
The University of Newcastle, Australia
Department of Electrical and Computer
Engineering
This
comprehensive, well written, and highly
illustrated tutorial touches lightly on
just about every aspect of spread
spectrum communications, ranging from
direct sequence and frequency hopping, to
time hopping, chirping, and hybrid
techniques. It covers PN coding theory
and generation, spectrum spreading, error
detection, modulation, synchronization,
as well as applications of spread
spectrum in space systems, personal
communication services (PCS), and
wireless local area networks (WLAN).
Jack
Glas
Agere Systems, Circuits and Systems
Research Lab
An
excellent one-page summary of spread
spectrum technology. This tutorial
provides a general overview of spread
spectrum's advantages over conventional
wireless systems, and gives some theory
as to how spread spectrum achieves these
advantages. The article also covers
pseudonoise (PN) codes and theory,
including Walsh sequences and Kasami
codes, and compares DSSS vs. FHSS.
This
two page paper briefly describes direct
sequence and frequency hopping, and then
compares their relative advantages and
disadvantages. It ends with a table
summarizing FHSS vs. DSSS. Note that the
comparison is based a bit less on theory
than upon limitations imposed by the IEEE
802.11 specification used in wireless LAN
and other applications.
Make a
name for yourself (or a colleague) in the
Spread Spectrum & CDMA industry! Be
the next to have your online article
memorialized in this section. Submit today!
Not
only have we compiled a glossary of just
about every SS-centric word and phrase we
could possibly think of, but present here
a list of QuickLinks for your clicking
convenience:
Though
not restricted to spread spectrum, this
is the most complete wireless dictionary
we've seen on the Web. Highly
Recommended! Don't expect a majority
of general spread spectrum terms, though.
Available in both an HTML and a PDF
version.
While
this doesn't have the depth of Agilent's
Dictionary, is certainly covers a lot
more ground -- nearly 6000 terms at last
count! And it's fully browsable and
searchable. What more could you ask for?
(If the link doesn't work, try www.getcommstuff.com.)
This
glossary isn't strictly spread spectrum
by any means. But its loaded with a lot
of wireless-related terms that may not be
covered in the other glossaries. There's
also Mobile World's New
Wireless Glossary, called CommsGlossary, which
looks similar, but may have even more
definitions.
A
comprehensive collection of RF,
microwave, and wireless communication
resources for radio design engineers.
Includes tutorials, theory, design aids,
circuit diagrams, OEM products, and more.
Make a
name for yourself (or a colleague) in the
Spread Spectrum & CDMA industry! Be
the next to have your online article
memorialized in this section. Submit today!
Basic,
Basics, Block Diagram, Circuit
Diagram, Circuits, Design,
Designs, Fundamentals of, How to,
Introduction to, OEM Product, OEM
Products, Schematic, Schematics,
System, Systems, What is, White
Paper, White Papers
