Spectrally agile multicarrier waveforms for opportunistic wireless access

Bogucka, Hanna; Wyglinski, Alexander M.; Pagadarai, Srikanth; Kliks, Adrian

doi:10.1109/mcom.2011.5783994

Cited by 31 publications

(32 citation statements)

References 11 publications

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“…The equations are applied to check the expressions of the PAPR distribution, which have been http://asp.eurasipjournals.com/content/2014/1/121 derived by other authors for the conventional OFDM and FBMC. In addition, the PAPR distribution, which is based on the general expression, is validated by means of a simulation for the non-orthogonal FDM (NOFDM) [16,17] and for the Walsh-Hadamard multi-carrier (WH-MC) [18]. This work also shows how the PAPR reduction problem can be formulated as a constrained optimization problem, which opens new research perspectives for the scientific community.…”

Section: Introductionmentioning

confidence: 91%

Closed-form approximations of the peak-to-average power ratio distribution for multi-carrier modulation and their applications

Chafii

Palicot

Gribonval

2014

EURASIP J. Adv. Signal Process.

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The theoretical analysis of the peak-to-average power ratio (PAPR) distribution for an orthogonal frequency division multiplexing (OFDM) system, depends on the particular waveform considered in the modulation system. In this paper, we generalize this analysis by considering the generalized waveforms for multi-carrier (GWMC) modulation system based on any family of modulation functions, and we derive a general approximate expression for the cumulative distribution function (CDF) of its PAPR, for both finite and infinite integration time. These equations allow us to directly find the expressions of the PAPR distribution for any particular functions and characterize the behaviour of the PAPR distribution associated with different transmission and observation scenarios. In addition to that, a new approach to formulating the PAPR reduction problem as an optimization problem, is presented in this study.

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Section: Introductionmentioning

confidence: 91%

Closed-form approximations of the peak-to-average power ratio distribution for multi-carrier modulation and their applications

Chafii

Palicot

Gribonval

2014

EURASIP J. Adv. Signal Process.

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“…Hopefully, GMC transceivers can be realized by the (I)FFT block followed by the bank of special polyphase filters [13,24]. Such an approach has been proposed already in the Filter-Bank based MultiCarrier systems and it has been shown that the increase of number of required operation per one transmit signal is relatively slight [15].…”

Section: Practical Realizationmentioning

confidence: 99%

“…OFDM) and non-orthogonal systems (e.g. NOFDM) or multicarrier systems realized by means of filterbanks (FBMC) can be generalized and included in the broader concept of the Generalized MultiCarrier (GMC) transmission [15,16]. In such an approach, the shapes of the transmit and receive pulses are not pre-defined and can be theoretically modified in order to fulfill some specific requirements.…”

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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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“…Overall, non-contiguous MCM techniques have been recognized as a suitable candidate for OSA due to their potential for achieving spectrally efficient communications by exploiting fragmented unoccupied spectrum while simultaneously achieving high data rates [8,9]. In fact, this form of data transmission approach is well-suited for future wireless communication systems, including CR systems [10].…”

Section: Spectrally Agile Multicarrier Waveform Frameworkmentioning

confidence: 99%

Protection of primary users in dynamically varying radio environment: practical solutions and challenges

Kryszkiewicz

Bogucka

Wyglinski

2012

J Wireless Com Network

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One of the primary objectives of deploying cognitive radio (CR) within a dynamic spectrum access (DSA) network is to ensure that the legacy rights of incumbent licensed (primary) transmissions are protected with respect to interference mitigation when unlicensed (secondary) communications are simultaneously operating within the same spectral vicinity. In this article, we present non-contiguous orthogonal frequency division multiplexing (NC-OFDM) as a promising and practical approach for achieving spectrally agile wireless data transmission that is suitable for secondary users (SUs) to access fragmented spectral opportunities more efficiently. Furthermore, a review of the current state-of-the-art is conducted with respect to methods specifically designed to protect the transmissions of the primary users (PUs) from possible interference caused by nearby SU transceivers employing NC-OFDM. These methods focus on the suppression of out-of-band (OOB) emissions resulting from the use of NC-OFDM transmission. To achieve the required OOB suppression, we present two practical approaches that can be employed in NC-OFDM, namely, the insertion of cancellation carriers and windowing. In addition to the theoretical development and proposed improvements of these approaches the computer simulation results of their performance are presented. Several real-world scenarios regarding the coexistence of both PU and SU signals are also studied using actual wireless experiments based on software-defined radio. These simulation and experimental results indicate that OOB suppression can be achieved under real-world conditions, making NC-OFDM transmission a viable option for CR usage in DSA networks.

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Spectrally agile multicarrier waveforms for opportunistic wireless access

Cited by 31 publications

References 11 publications

Closed-form approximations of the peak-to-average power ratio distribution for multi-carrier modulation and their applications

Closed-form approximations of the peak-to-average power ratio distribution for multi-carrier modulation and their applications

Mercury-Waterfilling for Generalized Multicarrier Signaling

Protection of primary users in dynamically varying radio environment: practical solutions and challenges

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