Advanced Techniques and Antenna Design for Pulse Shaping in UWB Cognitive Radio

Safatly, Lise; Al‐Husseini, Mohammed; El‐Hajj, Ali; Kabalan, Karim Y.

doi:10.1155/2012/390280

Cited by 7 publications

(5 citation statements)

References 14 publications

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“…But this mode is only applicable if two conditions are met: (1) if the UWB transmitter ensures that the targeted spectrum is completely free of signals of other systems, or if it shapes its pulse to have nulls in the bands used by these systems, and (2) if the regulations are revised to allow for this mode of operation [44]. Pulse adaptation for overlay UWB CR has been discussed in [45]. UWB can also operate in both underlay and overlay modes simultaneously.…”

Section: Antennas With Reconfigurable Band Rejectionmentioning

confidence: 99%

Cognitive Radio Transceivers: RF, Spectrum Sensing, and Learning Algorithms Review

Safatly

Bkassiny²,

Al‐Husseini³

et al. 2014

International Journal of Antennas and Propagation

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A cognitive transceiver is required to opportunistically use vacant spectrum resources licensed to primary users. Thus, it relies on a complete adaptive behavior composed of: reconfigurable radio frequency (RF) parts, enhanced spectrum sensing algorithms, and sophisticated machine learning techniques. In this paper, we present a review of the recent advances in CR transceivers hardware design and algorithms. For the RF part, three types of antennas are presented: UWB antennas, frequency-reconfigurable/tunable antennas, and UWB antennas with reconfigurable band notches. The main challenges faced by the design of the other RF blocks are also discussed. Sophisticated spectrum sensing algorithms that overcome main sensing challenges such as model uncertainty, hardware impairments, and wideband sensing are highlighted. The cognitive engine features are discussed. Moreover, we study unsupervised classification algorithms and a reinforcement learning (RL) algorithm that has been proposed to perform decision-making in CR networks.

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Section: Antennas With Reconfigurable Band Rejectionmentioning

confidence: 99%

Cognitive Radio Transceivers: RF, Spectrum Sensing, and Learning Algorithms Review

Safatly

Bkassiny²,

Al‐Husseini³

et al. 2014

International Journal of Antennas and Propagation

Self Cite

View full text Add to dashboard Cite

show abstract

“…But this mode is only applicable if two conditions are met: 1) if the UWB transmitter ensures that the targeted spectrum is completely free of signals of other systems, or shapes its pulse to have nulls in the bands used by these systems, and 2) if the regulations are revised to allow this mode of operation [18]. Pulse adaptation for overlay UWB CR has been discussed in [19]. UWB can also operate in both underlay and overlay modes simultaneously.…”

Section: Antennas With Reconfigurable Band Rejectionmentioning

confidence: 99%

Reconfigurable Microstrip Antennas for Cognitive Radio

Al‐Husseini¹,

Kabalan²,

El‐Hajj³

et al. 2013

Advancement in Microstrip Antennas With Recent Applications

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and communicate over a chosen white space (communication). For the latter operation, the antenna must be frequency-reconfigurable. Single-and dual-port antennas for overlay CR can be designed. In the dual-port case, one port has UWB frequency response and is used for channel sensing, and the second port, which is frequency-reconfigurable, is used for communicating. In the more challenging single-port design, the same port can have UWB response for sensing, and can be reconfigured for tunable narrowband operation when required to communicate over a white space.

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“…Walsh and Zinc basis functions have also been used in the UWB pulse design; however, these functions do not have any closed mathematical form for practical realization in hardware system; hence, these can only be generated using software synthesis. Pulse design using Parks‐McClellan algorithm, neural network, and a reconfigurable band stop filter for UWB cognitive radio is discussed in Safatly et al Parks‐McClellan and neural network pulse–shaping techniques are based on synthesis and use high‐order filtering. In Safatly et al, reconfigurable band stop technique needs high‐order band‐stopping filter; hence, pulse shaping methods in Safatly are complex to implement practically.…”

Section: Introductionmentioning

confidence: 99%

“…Pulse design using Parks‐McClellan algorithm, neural network, and a reconfigurable band stop filter for UWB cognitive radio is discussed in Safatly et al Parks‐McClellan and neural network pulse–shaping techniques are based on synthesis and use high‐order filtering. In Safatly et al, reconfigurable band stop technique needs high‐order band‐stopping filter; hence, pulse shaping methods in Safatly are complex to implement practically.…”

Section: Introductionmentioning

confidence: 99%

UWB pulse design using constraint convex sets method

Sharma

Bhatia

2017

Int J Communication

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In this paper, we propose a constrained convex sets-based method for designing ultra-wideband (UWB) pulse. The UWB pulses designed using earlier proposed methods either do not fit well in UWB spectral mask or require extra processing circuitry for pulses to fit in the UWB spectral mask. The proposed constraint sets-based method is flexible and optimum for the UWB mask. The pulse designed by the proposed method is Federal Communication Commission compliant and has an autocorrelation function similar to the Gaussian pulse. The bit error rate performance of time hopping binary phase shift keying using the proposed method and some of the existing methods such as Norman and Lee pulses and sixth derivative Gaussian pulse is analyzed in additive white Gaussian noise and Saleh-Valenzuela channels. Pulse designed using the proposed method outperforms existing pulse design, and the same is verified through simulations. The proposed algorithm is flexible and can also be used to mitigate narrow band interference, multiband UWB pulse generation and any other Federal Communication Commission (or other regulatory body) compliant spectrum mask by modifying the parameter of the proposed constraint set(s). INTRODUCTIONThe impulse radio ultra-wideband (UWB) technology is being adopted in IEEE 802.15.4 task group for unlicensed short-range high-data rate wireless transmission and can be used for other upcoming applications such as millimeter wave communications. 1 This unlicensed communication technology requires low power and low cost and, hence, can be used in low power wireless devices such as sensor networks, high-data rate wireless local area network, personal area network communication, various imaging and radar systems, and internet-of-things. 2-6 However, the UWB communication pulse design is a crucial and challenging task because pulse should be maximally flat in frequency, and narrow in time domain. Therefore, sinusoidal pulses are not suitable for UWB communications. Generally, convex optimization-based techniques have been used for the UWB pulse design. 7,8 Various UWB pulses are proposed in literature such as Gaussian, Hermite, and Prolate Spheroidal and using combination of orthogonal polynomials in. 4,9 Pulses used in UWB communications should satisfy the US Federal Communication Commission (FCC) spectral mask. 4 The UWB pulse should have minimum narrow band interference; therefore, its compatibility with FCC mask is desirable. The FCC mask compatible pulse can be designed with the help of projection onto the convex sets (POCS). The required convex sets are formulated based on a given a priori information about the UWB pulse. The proposed method in this paper for pulse designing is generic and flexible and, hence, can be easily applied FCC and other than FCC UWB standards, and also can be used for both single-and multiple-user environments. A vast literature on using various methods for UWB pulse design is available; hence, in this section, we review some of the commonly used UWB pulse designs. In Parr et al, 10 the U...

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Advanced Techniques and Antenna Design for Pulse Shaping in UWB Cognitive Radio

Cited by 7 publications

References 14 publications

Cognitive Radio Transceivers: RF, Spectrum Sensing, and Learning Algorithms Review

Cognitive Radio Transceivers: RF, Spectrum Sensing, and Learning Algorithms Review

Reconfigurable Microstrip Antennas for Cognitive Radio

UWB pulse design using constraint convex sets method

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