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dc.contributor.advisorHa, Tri T.
dc.contributor.advisorRobertson, R. Clark
dc.contributor.authorChua, Anthony Y. P.
dc.dateMarch, 1994
dc.date.accessioned2013-04-26T18:59:36Z
dc.date.available2013-04-26T18:59:36Z
dc.date.issued1994-03
dc.identifier.urihttp://hdl.handle.net/10945/30884
dc.description.abstractAn error probability analysis of a communications link employing convolutional coding with soft decision Viterbi decoding implemented on a fast frequency-hopped, binary frequency-shift keying (FFH/BFSK) spread spectrum system is performed. The signal is transmitted through a frequency nonselective, slowly fading channel with partial-band jamming. Noise normalization combining is employed at the receiver to alleviate the effects of partial-band jamming. The received signal amplitude of each hop is modeled as a Rician process, and each hop is assumed to fade independently. It is found that with the implementation of soft decision Viterbi decoding that the performance of the receiver is improved dramatically when the coded bit energy to partial-band noise power spectral density ratio (Eb/N1) is greater than 10dB. At higher Eb/ N1, the asymptotic error improves dramatically and varies from 10 to the -6 power to 10 to the -12 power depending on the constraint length (v), number of hops/bit (L), and the strength of the direct signal (alpha2/2alpha2). In addition, nearly worst case jamming occurs when the jammer uses a full band jamming strategy, even when L=l and there is a very strong direct signal (alpha2/2alpha 2= 100). Due to noncoherent combining losses, when the hopper bit ratio is increased, there is some degradation at moderate Eb/N1. Furthermore, when a stronger code is used (i.e., the constraint length is longer), performance improves, especially for high Eb/N1 where the asymptotic error is reduced. Finally, soft decision decoding improves performance over hard decision decoding from 4 to 8dB At moderate Eb/N1 depending on the code rate and with a much lower asymptotic error at high Eb/N1.en_US
dc.description.urihttp://archive.org/details/errorprobabiliti1094530884
dc.format.extent66 p.;28 cm.en_US
dc.language.isoen_US
dc.publisherMonterey, California. Naval Postgraduate Schoolen_US
dc.rightsThis publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. As such, it is in the public domain, and under the provisions of Title 17, United States Code, Section 105, may not be copyrighted.en_US
dc.titleError probabilities of FFH/BFSK with noise normalization and soft decision Viterbi decoding in a fading channel with partial-band jammingen_US
dc.typeThesisen_US
dc.contributor.secondreaderNA
dc.contributor.corporateNA
dc.contributor.departmentElectrical Engineering
dc.subject.authorNAen_US
dc.description.funderNAen_US
dc.description.recognitionNAen_US
dc.description.serviceSingapore Ministry of Defense author (civilian).en_US
etd.thesisdegree.nameM.S. in Electrical Engineeringen_US
etd.thesisdegree.levelMastersen_US
etd.thesisdegree.disciplineElectrical Engineeringen_US
etd.thesisdegree.grantorNaval Postgraduate Schoolen_US


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