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Author

B. Mazur

Bio: B. Mazur is an academic researcher. The author has contributed to research in topics: Viterbi decoder & Quadrature modulation. The author has an hindex of 1, co-authored 1 publications receiving 41 citations.

Papers
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Journal ArticleDOI
TL;DR: This paper examines the demodulation of the multi- h signals, and in particular examines the behavior of a decision-directed carrier loop which utilizes the Viterbi algorithm decoder in the calculation of the loop error signal.
Abstract: Multi- h phase coding is a bandwidth-efficient modulation which offers substantial performance improvement over conventional digital modulations with little or no bandwidth expansion. This paper examines the demodulation of the multi- h signals, and in particular examines the behavior of a decision-directed carrier loop which utilizes the Viterbi algorithm decoder in the calculation of the loop error signal. Both analytic and simulation results are presented and the agreement between the two is shown to be very close.

41 citations


Cited by
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Journal ArticleDOI
C.-E. Sundberg1
TL;DR: A number of methods for constructing constant amplitude signals which significantly outperform MSK are considered, and at what level of complexity these improvements are obtained and realized.
Abstract: M inimum Shift Keying (MSK) [ 11 or Fast Frequency Shift Keying (FFSK) is a digital modulation technique with constant amplitude which has been studied extensively during recent years. The properties of MSK are now understood [2-51. In this article, we report on methods to improve on MSK while maintaining a constant amplitude. By improvement we mean a narrower power spectrum, lower spectral sidelobes, better error probability, or all of the above. The cost of signal processing and the speed and complexity with which it can be performed has steadily been improved over recent years. Further improvements are to be expected. Therefore, it is reasonable to study what can be accomplished with methods that might be too complex for cost effective realization today, but perhaps may be easily achievable tomorrow. In this paper, we consider a number of methods for constructing constant amplitude signals which significantly outperform MSK [5-1031. We also discuss at what level of complexity these improvements are obtained and realized.

340 citations

Journal ArticleDOI
TL;DR: An overview of recent advances in constant envelope combined coding and modulation is given, and concatenations of phase codes and convolutional codes are examined.
Abstract: An overview is given of recent advances in constant envelope combined coding and modulation. Modulation codes and trellises are discussed, and major classes of trellis modulation codes are described. Continuous phase modulation is defined, and concatenations of phase codes and convolutional codes are examined. The ultimate capability of phase modulation coding and the size of CPM trellis codes are addressed. Implementation issues are considered. >

84 citations

Journal ArticleDOI
TL;DR: The nature and role of various constraints on code words and word sequences, including those commonly used on metallic lines, optical fibres, carrier channels and radio links are discussed, and some examples from each of these applications are given.
Abstract: The role of line coding is to convert source data to a digital form resistant to noise in combination with such other impairments as a specific medium may suffer (notably intersymbol interference, digit timing jitter and carrier phase error), while being reasonably economical in the use of bandwidth. This paper discusses the nature and role of various constraints on code words and word sequences, including those commonly used on metallic lines, optical fibres, carrier channels and radio links ; and gives some examples from each of these applications. It should serve both as a general review of the subject and as an introduction to the companion papers on specific topics.

75 citations

Journal ArticleDOI
TL;DR: Symbol timing in continuous phase modulated signals is investigated making use of maximum likelihood estimation methods and it turns out that full response schemes are comparatively easier to synchronize.
Abstract: Symbol timing in continuous phase modulated signals is investigated making use of maximum likelihood estimation methods. Nondata-aided algorithms are proposed with a feedforward structure. They are suitable for digital implementation and can be employed with either full or partial response signaling. Multilevel symbol alphabets are allowed and the modulation index may be arbitrary. The performance is assessed by analysis and simulation. It turns out that full response schemes are comparatively easier to synchronize. Difficulties arise with partial response signaling especially with long frequency pulses.

64 citations

Journal ArticleDOI
I. Sasase1, S. Mori1
TL;DR: An overview of some recent results for multi-h phase-coded modulation (MHPM) schemes is provided, and MHPM combined with convolutional codes, asymmetric modulation indices, or nonuniform mapping are investigated.
Abstract: An overview of some recent results for multi-h phase-coded modulation (MHPM) schemes is provided. These schemes offer power and bandwidth efficiency where time-varying modulation indices are used. Following a brief description of the structure of MHPM, its fundamental properties (e.g., minimum Euclidean distance and power spectra) are described. Decoding and demodulation of MHPM also are discussed. and some results on synchronization are summarized. MHPM combined with convolutional codes, asymmetric modulation indices, or nonuniform mapping are investigated. >

57 citations