Accession Number : ADA429011


Title :   Digital Communications Over Fading Channels


Descriptive Note : Technical rept. 1 Jan-31 Dec 2004


Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA


Personal Author(s) : Robertson, R. C. ; Beltz, Nathan E.


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=ADA429011


Report Date : 15 NOV 2004


Pagination or Media Count : 104


Abstract : In this report, the probabilities of bit error for the most commonly used digital modulation techniques are analyzed. Analytic solutions are developed for the probability of bit error when the signal is affected by the most commonly encountered impairment to system performance for a wireless channel, the transmission of the signal over a fading channel. In this report, the effect of a slow, flat Ricean fading channel on communications systems performance is examined. Since channel fading significantly degrades the performance of a communication system, the performance of digital communication systems that also use forward error correction channel coding is analyzed for hard decision decoding and, where appropriate, for soft decision decoding. Diversity, another technique to mitigate the effect of fading channels on digital communication systems performance, is also discussed. Also included is a discussion of the effect of narrowband noise interference, both continuous and pulsed, on digital communication systems. We then discuss the analysis of the probability of bit error for the combination of error correction coding and diversity. Following this, we briefly discuss spread spectrum systems. Next, we examine the link budget analysis and various models for channel loss. Finally, we examine in detail the second generation digital wireless standard Global System for Mobile (GSM).


Descriptors :   *ERROR ANALYSIS , *DIGITAL COMMUNICATIONS , *CHANNELS , *FADING(ELECTROMAGNETIC WAVES) , INTERFERENCE , COMMUNICATION AND RADIO SYSTEMS , ERROR CORRECTION CODES , NARROWBAND , SPREAD SPECTRUM , RADIOTELEPHONES.


Subject Categories : RADIOFREQUENCY WAVE PROPAGATION
      RADIO COMMUNICATIONS


Distribution Statement : APPROVED FOR PUBLIC RELEASE