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Spread Spectrum & CDMA Resources

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.

Visitors: Check out our line of PN Sequence Generators.



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SS Resources Directory

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Spread Spectrum & CDMA Primers

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Spread Spectrum & CDMA History

The Birth of Spread Spectrum    

Top

Anna Couey
for Sirius Communications
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!


The Fascinating Story of the Lamarr/Antheil
Spread-Spectrum Patent
   

Top

Chris Beaumont
WebWeavers
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.


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Spread Spectrum & CDMA Tutorials

The ABCs of Spread Spectrum   (Reprint)

Top

Randy Roberts
Spread Spectrum Scene Online
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.


Spread Spectrum & CDMA Tutorial   (Reprint)

Top

Unknown Author
Unknown Organization
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.


Spread Spectrum (SS) - Introduction (PDF)   (Reprint)

Top

ir. J. Meel
De Nayer Instituut
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 World of CDMA - An Overview of IS-95    

Top

Dr. Arthur Ross
CDMA Development Group
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.


An Overview of IS-95 and cdma2000    

Top

Unknown Author
Unknown Organization
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.


Spread Spectrum Communications   (Reprint)

Top

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).


The Principles of Spread Spectrum Communication    

Top

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.


Direct Sequence vs. Frequency Hopping (PDF)    

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Wave Wireless Networking, Inc.
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.


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Spread Spectrum & CDMA Glossaries

New Wave's Own Spread Spectrum Glossary   (Reprint)

Top

Engineering Staff
New Wave Instruments
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:

Chip Rate -- Code Division Multiple Access (CDMA) -- CDMA 2000 -- Direct Sequence Spread Spectrum (DSSS) -- Frequency Hopping Spread Spectrum (FHSS) -- GMSK Modulation -- Gold Codes -- Linear Feedback Shift Registers (LFSR) -- Linear Recursive Sequences (LRS) -- M-Sequences -- MSK Modulation -- Multipath Fading -- OQPSK Modulation -- PN Code -- PN Sequences -- PN Synchronization -- Pseudo-Random Bit Sequences (PRBS) -- QPSK Modulation -- Signal-to-Noise Ratio (SNR) -- Spread Spectrum Technique -- Spread Spectrum Generator -- Wideband CDMA (WCDMA or W-CDMA) -- Wireless LAN (WLAN or W-LAN)


Agilent's Online Wireless Dictionary    

Top

Agilent
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.


TIA B2B's Digital Communications Glossary    

Top

TIA B2B
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.)


Mobile World's Wireless & PCS Glossary    

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Mobile World
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.


New Wave's RF & Wireless Directory    

Top

Engineering Staff
New Wave Instruments
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.


New Wave's Wireless Acronym Guide   (Reprint)

Top

Engineering Staff
New Wave Instruments
With over 300 wireless terms, this is one of the most comprehensive list of acronyms available in the field of digital communications.


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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!





















Other Spread Spectrum Resources - Non-Indexed

Organizations
Amateur Radio Spread Spectrum Communications Page




















Relevant Search Terms

For the benefit of those searching the Web, following are search terms relevant to this page:

Spread Spectrum Topics:

Amateur Radio Spread Spectrum, CDMA 2000 Tutorial, CDMA2000 Tutorial, CDMA2000 Tutorials, CDMA Technology, CDMA Theory, CDMA Tutorial, Correlator, Spread Spectrum System, Spread Spectrum Systems, Spread Spectrum Technique, Spread Spectrum Techniques, Spread Spectrum Theory, Spread Spectrum Tutorial, Spread Spectrum Tutorials, WCDMA Tutorial, W-CDMA Tutorial

RF & Microwave Topics:

Autocorrelation, Channel, Cross-Correlation, Demodulation, Demodulator, Demodulators, IC, Integrated Circuit, Integrated Circuits, Modulation. Modulator, Modulators

Resources:

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

British Equivalents:

(none)







   
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  2005 New Wave Instruments   Page revised on 12/18/02.