Analysis, Optimization, and Implementation of Low-Interference Wireless Multicarrier Systems

Matz, Gerald; Schafhuber, D.; Gröchenig, Karlheinz; Hartmann, M.; Hlawatsch, Franz

doi:10.1109/twc.2007.360393

Cited by 85 publications

(122 citation statements)

References 31 publications

(65 reference statements)

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“…We note that the same statistical structure would be obtained with an orthogonal [15] receive pulse even if it is not well concentrated.…”

Section: Noise Statisticssupporting

confidence: 55%

“…More generally, it is shown in [15] that there exist perfect-reconstruction pulses g and γ that are jointly well time-frequency localized, i.e., A g,g (m, ξ), A γ,γ (m, ξ), and A γ,g (m, ξ) are fast decaying, yielding MC systems with almost vanishing ISI. We note that our analysis remains valid even for strong ICI, i.e., for rapidly time-varying channels.…”

Section: A Statistics Of the System Channelmentioning

confidence: 99%

“…For classical cyclic-prefix OFDM, this means that a precoding can be avoided if pulseshaping MC transmission is used instead. We note that pulseshaping MC systems can be implemented efficiently by means of fast Fourier transform and overlap-add techniques [15].…”

Section: /2mentioning

confidence: 99%

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On the Capacity-Achieving Input Covariance for Multicarrier Communications over Doubly Selective Channels

Taubock¹,

Hlawatsch²

2007

2007 IEEE International Symposium on Information Theory

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Abstract-We consider pulse-shaping multicarrier (MC) communications over a (possibly rapidly varying) doubly selective channel with uncorrelated scattering. Assuming transmission free of intersymbol interference (while intercarrier interference is not constrained), we show that the statistical properties of the MC system are invariant under cyclic shifts of the subcarriers. This invariance is then used to derive structural properties of the capacity-achieving input covariance function. We show that capacity can be achieved by transmit symbols that are uncorrelated over time and cyclically stationary with respect to the frequency (subcarrier) index. We also show that capacityachieving precoding can be equivalently realized by a suitable adaptation of the transmit pulse. For classical OFDM and transmission over a WSSUS channel, precoding can be completely avoided if pulse-shaping MC transmission is used instead.

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“…We note that the same statistical structure would be obtained with an orthogonal [15] receive pulse even if it is not well concentrated.…”

Section: Noise Statisticssupporting

confidence: 55%

Section: A Statistics Of the System Channelmentioning

confidence: 99%

See 1 more Smart Citation

On the Capacity-Achieving Input Covariance for Multicarrier Communications over Doubly Selective Channels

Taubock¹,

Hlawatsch²

2007

2007 IEEE International Symposium on Information Theory

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“…These two approaches can be generalized and represented as the special cases of the so-called GMC signals. In that case neither the density of pulse allocation on the TF plane nor the pulse shape are usually specified [12,13,22,23]. The distance between the pulses on the TF plane and the transmit pulse shape can be theoretically chosen without any constraints.…”

Section: The Concept Of Generalized Multicarrier Signalingmentioning

confidence: 99%

Mercury-Waterfilling for Generalized Multicarrier Signaling

Kliks

2013

Wireless Pers Commun

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Orthogonal Frequency Division Multiplexing is often treated as the promising technique for next wireless or wired communication systems. Beside its great advantages, orthogonal frequency division multiplexing has also some weaknesses, such as high out-ofband emission or high peak-to-average power ratio, which become the basis for investigation on new transmission techniques. In this paper the application of the so-called generalized multicarrier (GMC) signaling is considered as a good solution for application in future systems, especially for cognitive-radio applications. It is characterized by high flexibility and adaptability of its parameters, thus allowing for e.g. low out-of-band emission. In this work the possibilities of application of link adaptation techniques have been analyzed, with the particular attention put on the mercury-waterfilling principle. Two approaches of application of this procedure in GMC systems have been proposed and analyzed by means of computer simulations.

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“…One of the main criteria for pulse shape design is the timefrequency localization (TFL), which has been identified in [14] as an important target to achieve low out-of-band emissions and low interference induced in doubly dispersive channels. Furthermore, [15][16][17] investigated the pulse shape optimization framework considering realistic channel knowledge. However, these resulting pulse shapes usually span over several successive symbols, rendering them not well suited for selected scenarios like short-block low-latency transmission or fast time division duplex (TDD) uplink-downlink switching.…”

Section: Introductionmentioning

confidence: 99%

Pulse shaping design for OFDM systems

Zhao

Schellmann

Gong

et al. 2017

J Wireless Com Network

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Spectrally contained OFDM-based waveforms are considered key enablers for a flexible air interface design to support a broad range of services and frequencies as envisaged for 5G mobile systems. By allowing for the flexible configuration of physical layer parameters in response to diverse requirements, these waveforms enable the in-band coexistence of different services. One candidate from this category of waveforms is pulse-shaped OFDM, which follows the idea of subcarrier filtering while fully maintaining the compatibility with CP-OFDM. In this paper, we provide an overview of pulse shaping methods in OFDM systems and propose a new pulse-shaped design method with arbitrary length constraint and good time-frequency localization property. Based on the pulse design, we discuss different receiver realizations and present a criterion for pulse shape evaluation. In addition, the parameterizations of OFDM system to address diverse requirements of the services envisaged for the 5G systems are described. Link and system performance results for selected scenarios show that a proper design of the OFDM numerologies and pulse shapes could substantially improve the performance under time and frequency distortions. Furthermore, pulse-shaped OFDM is able to support asynchronous transmissions and reduce the signal sensitivity to Doppler distortions, rendering it beneficial for various applications from the context of vehicular communications and the Internet-of-things.

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Analysis, Optimization, and Implementation of Low-Interference Wireless Multicarrier Systems

Cited by 85 publications

References 31 publications

On the Capacity-Achieving Input Covariance for Multicarrier Communications over Doubly Selective Channels

On the Capacity-Achieving Input Covariance for Multicarrier Communications over Doubly Selective Channels

Mercury-Waterfilling for Generalized Multicarrier Signaling

Pulse shaping design for OFDM systems

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