Advanced intermediate frequency zero-crossing detection of bandpass filtered MSK signals

Scholand, Tobias; Jung, Peter

doi:10.1049/el:20030424

Cited by 6 publications

(13 citation statements)

References 4 publications

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“…The explicit expressions for f 2þ1 ðtÞ, 2 N, can be found in Reference [38] and partly in Reference [21] and shall hence not be repeated here. Obviously, Equation (8) motivates the approximation which was already invoked by the authors in Reference [15]. With the filtered phase impulse…”

Section: Continuous-time Representationmentioning

confidence: 67%

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Intermediate frequency zero‐crossing detection of filtered MSK based on irregular sampling

Scholand

Jung

2007

Trans Emerging Tel Tech

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SUMMARYShort range communication systems such as Bluetooth and DECT (Digital Enhanced Cordless Telecommunications) deploy Gaussian frequency shift keying (GFSK), which is a continuous phase modulation (CPM) scheme derived from minimum shift keying (MSK). Since these short range communication systems require low-cost transceiver structures, the development of appropriate receiver techniques has been a major research topic. Particularly, analogue limiter-discriminator-integrator (LDI) dump filtering techniques have received considerable attention. With the availability of digital signal processing (DSP), the digital implementation of LDI techniques has become increasingly attractive. In order to make LDI receivers more accessible, zero-crossing detection was proposed. First, the authors shall focus on the establishment of an appropriate mathematical discrete-time system model, taking bandlimiting receiver filters into account explicitly. This system model serves as the basis for the development of a multitude of digital zero-crossing detection techniques. Starting from this mathematical discrete-time system model, the authors shall focus on a novel, yet promising, approach to digital zero-crossing detection in the intermediate frequency domain, using irregular sampling instead of the commonly employed regular sampling. The novel detectors shall be termed zero-crossing decorrelation detectors (ZXDDs), because a decorrelating approach will be used. The authors shall present three different variants of the ZXDD. The performance of these ZXDD schemes has been analysed in simulations by the authors and obtained results shall be presented and compared to the performance of known LDI and zero-crossing detection based techniques.

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Section: Continuous-time Representationmentioning

confidence: 67%

“…also [15,16]. Since the modified system matrixG, introduced in Equation (35), is quadratic, the LS and the GLS estimator approaches lead to the same result.…”

Section: Algorithmmentioning

confidence: 99%

Intermediate frequency zero‐crossing detection of filtered MSK based on irregular sampling

Scholand

Jung

2007

Trans Emerging Tel Tech

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“…In this case, the radio channel can be regarded as a single path channel (cf., e.g. [35][36][37][38]. Furthermore, the time variation of the radio channel is very small and will hence be neglected in what follows [9,40].…”

Section: R E C E I V E D S I Gnalsmentioning

confidence: 99%

“…which was already invoked by the authors in [36]. According to (9), r TP,u,approx (t) is the corresponding low-pass equivalent complex envelope of the approximation and α approx (t) being the approximated phase.…”

Section: R E C E I V E D S I Gnalsmentioning

confidence: 99%

“…This system model extends the presentations of [35][36][37][38]. First, we shall give a representation of binary FM in Section 2 and reflect possible detectors in Sections 3 and Section 4 will consider higher order differential phase shift keying schemes, the corresponding detectors will be given in Sections 5 and Section 6 will conclude the manuscript.…”

Section: Introductionmentioning

confidence: 99%

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A Real-Time Zero-Crossing Demodulation Concept

Scholand

Spiegel

Waadt

et al. 2006

Wireless Pers Commun

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Short range communication systems such as Bluetooth and Digital Enhanced Cordless Telecommunications require low-cost transceiver structures. Hence, the development of appropriate receiver techniques has been a major research topic. Particularly, analog limiter-discriminator with integrate and dump filtering (LDI) techniques have received considerable attention. With the availability of digital signal processing, the digital implementation of LDI techniques has become increasingly attractive. In order to make LDI receivers more accessible, zero-crossing detection was proposed. In this communication, the authors shall focus on a novel, yet promising, approach to digital zero-crossing detection in the intermediate frequency domain. Zero-crossing demodulation is an irregular sampling technique, which replaces the commonly employed regular, i.e. temporally equidistant sampling technique in the mentioned low-cost receivers. In this manuscript, a real-time capable receiver concept deploying zero-crossing demodulation shall be presented. First, the authors shall present the theoretical aspects of zero-crossing demodulation with special focus on both Bluetooth Basic Rate and Bluetooth Enhanced Data Rate. Next, the obtained performance results in terms of the bit error ratio shall be given.Keywords: π /4-Shifted differential quadrature phase shift keying, bluetooth, bluetooth basic rate, Bluetooth enhanced data rate, continuous phase modulation, differential phase shift keying, digital enhanced cordless telecommunications, frequency modulation, Gaussian frequency shift keying, minimum shift keying, octal differential phase shift keying, real-time implementation, zero-crossing demodulation.

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Bluetooth receiver with zero-crossing zero-forcing demodulation

Scholand

Jung

2003

Electron. Lett.

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Advanced intermediate frequency zero-crossing detection of bandpass filtered MSK signals

Cited by 6 publications

References 4 publications

Intermediate frequency zero‐crossing detection of filtered MSK based on irregular sampling

Intermediate frequency zero‐crossing detection of filtered MSK based on irregular sampling

A Real-Time Zero-Crossing Demodulation Concept

Bluetooth receiver with zero-crossing zero-forcing demodulation

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