Performance Analysis of Reconfigurable Antenna Arrays

Senanayake, Rajitha; Smith, Peter J.; Martin, Philippa A.; Evans, Jamie

doi:10.1109/tcomm.2017.2682081

Cited by 9 publications

(8 citation statements)

References 38 publications

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“…Selecting the best beam for data communication has been considered before in [23]- [26] using general/traditional directional antennas (with multi-RF chain) and in [17]- [19], [27], [28] using RAs for underlay CR systems. For instance, the authors in [17] considered space-shift keying (SSK) signaling and investigated the best beam selection method that improves SSK performance (in terms of throughput, system complexity, error probability), via minimizing the Rician K-factor and the correlation coefficient between the antenna beams.…”

Section: Beam Selection For Data Communication In Underlay Cr Systmentioning

confidence: 99%

“…in which f εm (x|g, φ PU ) and F εm (x|g, φ PU ) are the conditional pdf and CDF of ε m given in (19). Without loss of generality, suppose i = 1.…”

Section: A Energy-based Binary Detector For Channel Sensing Using Esmentioning

confidence: 99%

“…ESPAR antennas have been used in [16], to provide an end-to-end solution for practically implementable cloud radio access networks. RAs can enhance performance of multiple-input multiple-output (MIMO) systems, via enabling joint beam and antenna selection optimization [17]- [19].…”

Section: Introduction a Overview And Backgroundmentioning

confidence: 99%

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Beam Selection and Discrete Power Allocation in Opportunistic Cognitive Radio Systems With Limited Feedback Using ESPAR Antennas

Yazdani

Vosoughi

Gong

2020

IEEE Trans. Cogn. Commun. Netw.

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We consider an opportunistic cognitive radio (CR) system consisting of a primary user (PU), secondary transmitter (SUtx), and secondary receiver (SUrx), where SUtx is equipped with an electrically steerable parasitic array radiator (ESPAR) antenna with beam steering capability for sensing and communication, and there is a limited feedback channel from SUrx to SUtx. Taking a holistic approach, we develop a framework for integrated sector-based spectrum sensing and sector-based data communication. Upon sensing the channel busy, SUtx determines the beam corresponding to PU's orientation. Upon sensing the channel idle, SUtx transmits data to SUrx, using the selected beam corresponding to the strongest channel between SUtx and SUrx. We formulate a constrained optimization problem, where SUtx-SUrx link ergodic capacity is maximized, subject to average transmit power and interference constraints, and the optimization variables are sensing duration, thresholds of channel quantizer at SUrx, and transmit power levels at SUtx. Since this problem is non-convex we develop a suboptimal computationally efficient iterative algorithm to find the solution. Our numerical results quantify the capacity improvement provided by the ESPAR antenna and demonstrate that our CR system yields lower outage and symbol error probabilities, compared with a CR system that its SUtx has an omni-directional antenna.Index Terms-Beam selection, cognitive radio, constrained ergodic capacity maximization, discrete power allocation, ESPAR antenna, imperfect channel sensing, error-free bandwidth limited feedback channel, reconfigurable antennas.

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Section: Beam Selection For Data Communication In Underlay Cr Systmentioning

confidence: 99%

“…in which f εm (x|g, φ PU ) and F εm (x|g, φ PU ) are the conditional pdf and CDF of ε m given in (19). Without loss of generality, suppose i = 1.…”

Section: A Energy-based Binary Detector For Channel Sensing Using Esmentioning

confidence: 99%

See 1 more Smart Citation

Beam Selection and Discrete Power Allocation in Opportunistic Cognitive Radio Systems With Limited Feedback Using ESPAR Antennas

Yazdani

Vosoughi

Gong

2020

IEEE Trans. Cogn. Commun. Netw.

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“…The frequency reconfigurable antenna has similar performance of multiple antennas, which can largely extend the range of the working band and improve the working efficiency. [4][5][6][7][8] Several approaches of designing frequency reconfigurable antennas have been reported. The radio frequency (RF) MEMS 9 and PIN diodes, varactor diodes, 10 lumped elements and electronic RF switching devices 11 are commonly utilized to design electrical frequency reconfigurable antennas, 12 while these methods still suffer from unexcepted low/uneven gain response.…”

Section: Introductionmentioning

confidence: 99%

Metamaterial‐based frequency reconfigurable microstrip antenna for wideband and improved gain performance

Zhou

Wang

Deng

et al. 2021

Int J RF Mic Comp-Aid Eng

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A metamaterial-based frequency reconfigurable microstrip antenna is proposed with wideband tuning range and enhanced gain. By co-designing the main reconfigurable microstrip patch unit and the upper-layer located reconfigurable negative-permeability-metamaterial resonant loop, the gain of the resultant proposed antenna is readily improved. The wideband reconfigurability of the microstrip antenna and the metamaterial unit is realized by tuning the capacitance values of the varactor diodes through altering their bias voltages. Furthermore, the effect of different number of reconfigurable metamaterial units on the gain of the proposed antenna is extensively explored, which shows the radiation pattern is largely improved since the electromagnetic energy is more concentrated and directed. Finally, the proposed antenna is fabricated and measured. The experimental results demonstrate that the operating range of the proposed antenna is within 8.6-10.3 GHz, and the reflection coefficient is less than À10 dB, and the gain is above 6 dBi. The radiation efficiency of the antenna is above 85%. The electrical size of the antenna is 0.58λ 0 Â 0.58λ 0 . As expected, the proposed antenna has the main advantage of enhanced gain performance, while performing comparable frequency tuning range.

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“…Therefore, instead of using several antennas, it is more compact and efficient to use one multi-band antenna that accommodates multiple modes. A reconfigurable antenna [7][8][9][10][11][12][13][14] is an antenna capable of dynamically modifying its frequency and radiation properties in a controlled and reversible manner in order to provide a dynamical response. By using different patch reconfigurations we obtain different results of gain, bandwidth, and efficiency.…”

Section: Introductionmentioning

confidence: 99%

Variode Enabled Frequency-Reconfigurable Microstrip Patch Antenna With Operation Band Covering S and C Bands

Guo¹,

Deng²,

Dong³

et al. 2020

PIER M

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A frequency continuous reconfigurable microstrip patch antenna with operation band covering S-band and C-band is introduced. The antenna consists of a central rectangular patch and four parasitic patches with a symmetrical structure, connected by four varactor diodes in the middle position of the edge of each patch. With help of HFSS microwave studio simulation, results have shown that, by altering the bias voltage on varactor diodes, the operated frequencies vary continuously within a wide range from 3.29 to 4.01 GHz and 5.35 to 7.00 GHz, which cover S-band and C-band. Further measurement, which verifies the simulation by reasonable agreement, has been carried out. Besides, this frequency reconfigurable antenna maintains broadside radiation and stable radiation pattern. Specifically, the gain is basically maintained at around 4.5 dBi with the working frequency increasing from 3.60 to 7.00 GHz. Compared with other frequency-reconfigurable antennas available in previous literature, the proposed antenna has advantages of a wide frequency tuning range, high frequency selectivity, simple and stable structure, low cost, and miniaturization, which make it a promising candidate as cognitive radio and future wireless communication systems.

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Performance Analysis of Reconfigurable Antenna Arrays

Cited by 9 publications

References 38 publications

Beam Selection and Discrete Power Allocation in Opportunistic Cognitive Radio Systems With Limited Feedback Using ESPAR Antennas

Beam Selection and Discrete Power Allocation in Opportunistic Cognitive Radio Systems With Limited Feedback Using ESPAR Antennas

Metamaterial‐based frequency reconfigurable microstrip antenna for wideband and improved gain performance

Variode Enabled Frequency-Reconfigurable Microstrip Patch Antenna With Operation Band Covering S and C Bands

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