Spread Spectrum - It's not just for breakfast anymore!

More documents

Recommendations

Info

it falls under Part 15 or Part 97 of the FCC Rulesand Regulations and remain within their guidelines.If the Amateur wishes to expand beyond thepresent Part 97 rules in bonafide experimentation,they are encouraged to join in the SpecialTemporary Authority.Spread spectrum systems exhibit uniquequalities that cannot be obtained from conventionalnarrowband systems. There are many researchavenues exploring these unique qualities.Amateurs in their inherent pioneering nature canand will find new and novel applications for spreadspectrum communications that the commercialsector may not even think of. And due to the frugalpropensity of the Radio Amateur, they willcertainly find the least expensive way to implementit, thus driving down the cost.Amateurs should realize that there is plenty ofroom to explore spread spectrum techniques. Allthat remains now is to pick up a few good books onthe subject and warm up the soldering iron. And asyou progress upon this road less traveled, makesure you take notes along the way. Then shareyour discoveries with your fellow Amateur to helpall of us expand the horizon with this excitingmode of communications call spread spectrum. Itis no longer shrouded in secrecy and it’s not justfor breakfast anymore!WEB CrawlingHere are two WEB pages of interest. I'vestarted a general amateur radio SS page,http://www.tapr.org/ss.See also the PANSAT page athttp://www.sp.nps.navy.mil/pansat/pansat.htmlSelected BibliographyBooks -Extensive research oriented analysis -M.K. Simon, J. Omura, R. Scholtz, and K.Levitt, Spread Spectrum Communications Vol. I, II,III. Rockville, MD. Computer Science Press, 1985.Intermediate level -J.K. Holmes, Coherent Spread SpectrumSystems, New York, NY. Wiley Interscience, 1982.D.J. Torrieri, Principles of SecureCommunication Systems. Boston. Artech house,1985.Introductory to intermediate levels -G.R. Cooper and C.D. McGillem, ModernCommunications and Spread Spectrum, New York,McGraw-Hill, 1986.R.E. Ziemer and R.L. Peterson, DigitalCommunications and Spread Spectrum Systems,New York, Macmillan, 1985.R.E. Ziemer and R.L. Peterson,Introduction to Digital Communications, NewYork, Macmillan, 1985.Practical -R.C. Dixon, Spread Spectrum Systems,John-Wiley & Sons, 1984.Journals -There have been several special issues of IEEEpublications that are devoted to spread spectrumsystems. IEEE Transactions on Communications:August 1977 and May 1982. IEEE Journal ofSelected Areas in Communications: May 1990,June 1990, and May 1992.References(1) R.C. Dixon, Spread Spectrum Systems, John-Wiley & Sons, 1984, page 7.(2) K. Gilhousen, Qualcomm Inc., USENETnewsgroup discussion.
Power Spectral Density(PSD)Narrowband WaveformSpread WaveformNoise LevelFrequencyFigure 1. Comparison of a narrowband signal with a Direct Sequence Spread Spectrum signal. Thenarrowband signal is suppressed when transmitting spread spectrum.Power Spectral Density(PSD)Carrier Frequency “hops” from channel to channelFrequencyFigure 2. An example of Frequency Hopping Spread Spectrum signal.Data BurstTime0 Tf 2Tf 3Tf 4TfFigure 3. Time Hopping Spread Spectrum. Each burst consists of k bits of data and the exact time each burstis transmitted is determined by a PN sequence.
Page 7: as possible. This spawns innovative

Spread Spectrum - It's not just for breakfast anymore!

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?