Cosine series function design of offset quadrature binary modulation systems

Vigil, A.J.; Belkerdid, M.A.; Malocha, D.C.

doi:10.1109/milcom.1991.258316

Cited by 7 publications

(2 citation statements)

References 19 publications

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“…which can ensure all coefficient terms in Equation (12) associated with !T equal to zero in order to guarantee the fastest PSD sidelobe roll-off rate in Equation (11). The solution to Equation (13) yields…”

Section: Steepest Sidelobe Roll-off (Ssr) Methodsmentioning

confidence: 99%

“…Pulse shaping waveform design for bandwidth efficient digital modulations is a very traditional research topic and various PSW's were proposed in the literature [1][2][3][4][5][6][7][8][9][10][11][12] for their various applications in digital communication systems to enhance spectral efficiency or other performance parameters in different operational environments, such as band-limited nonlinear channels and so on. In general, the methods used to generate all those PSW's for bandwidth efficient digital modems can be classified into two major categories: intuitive methods and piece-wise fitting methods.…”

Section: Introductionmentioning

confidence: 99%

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Synthesisation of pulse shaping waveforms for spectral efficient digital modulations: some practical approaches

Chen

Cai

Chao

et al. 2005

Trans Emerging Tel Tech

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SUMMARYBandwidth efficiency of all digital modulations is associated closely with baseband pulse shaping waveforms (PSW's) before carrier modulation. Traditional PSW designing approaches usually work in a way such that the design of PSW's in the time domain hardly reveals a direct connection with their spectral characteristics. In other words, designing process of the PSW's offers too little degree-of-freedom to control spectral properties of the resultant signals. This paper will present a methodology, based on which several new PSW synthesising approaches, including time-domain convolution (TDC), steepest sidelobe roll-off (SSR) and zero-point insertion (ZPI) methods, will be proposed to design different PSW's with controllable spectral characteristics, such as sidelobe roll-off rate, main lobe width and null positions in their power spectral density functions. In particular, the SSR and ZPI methods are based on a truncated cosine function series, which can be further generalised to use other seed functions. The results show that the approaches can help us to generate a PSW database containing a wide collection of promising PSW's to suit for diverse wireless applications, such as traditional digital modems as well as emerging ultra-wideband systems.

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Section: Steepest Sidelobe Roll-off (Ssr) Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesisation of pulse shaping waveforms for spectral efficient digital modulations: some practical approaches

Chen

Cai

Chao

et al. 2005

Trans Emerging Tel Tech

View full text Add to dashboard Cite

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SAW quadrature binary modulation system applications

Vigil

Belkerdid²,

Malocha³

1993

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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A surface acoustic wave (SAW) modulation system has been built, using a combination of a digital message sequence, an impulse driver, and different SAW modulator filters, for experimental testing of a wide variety of quadrature binary modulation schemes. The RF testbed is described and characterized for system distortion, dynamic range, and spurious responses, and system optimization is discussed. Nine different SAW modulator filters having different time- and frequency-domain responses were designed and fabricated for use in the system. Several of the designs are representative of new modulation schemes which offer better spectral confinement; and time-domain envelope uniformity than MSK. The results obtained with the designed SAW quadrature binary modulation system are presented. Excellent agreement between time- and frequency-domain measurements and theoretical predictions using the SAW modulation system are shown.

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Design of SAW FIR filters for quadrature binary modulation systems

Vigil

Malocha²,

Belkerdid³

1993

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Approaches for designing surface acoustic wave (SAW) filters used in pulsed quadrature binary modulation (QBM) systems are presented. Several previously defined pulse shapes were implemented by a SAW filter and showed good QBM system performance with respect to modulation envelope nonuniformity (AM) and intersymbol interference (ISI). A new approach to QBM pulse shape definition using both frequency- and time-domain design criteria is described. This approach allows families of new pulse shapes having various levels of AM and spectral confinement to be designed. The approaches to the design equations are presented, and examples of specific pulse shapes and their implementation using SAW filters are given. Time- and frequency-domain results of iteratively designed pulse shapes for application to QBM systems are also presented, showing good performance.

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Cosine series function design of offset quadrature binary modulation systems

Cited by 7 publications

References 19 publications

Synthesisation of pulse shaping waveforms for spectral efficient digital modulations: some practical approaches

Synthesisation of pulse shaping waveforms for spectral efficient digital modulations: some practical approaches

SAW quadrature binary modulation system applications

Design of SAW FIR filters for quadrature binary modulation systems

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