Ultrawideband (UWB) antenna design for cognitive radio

Nayak, Peshal; Verma, Sunil; Kumar, Preetam

doi:10.1109/codec.2012.6509199

Cited by 7 publications

(4 citation statements)

References 11 publications

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“…The dual band radio card has 4 external antennas providing antenna gains of 2.52 dBi in the 2.4 GHz band and 3.81 dBi in the 5 GHz band. Antennas with such gains are typically needed for WLAN operations [10][11][12][13][14]. The AP is IEEE 802.11ac compliant and supports up to 3 simultaneous spatial streams and up to 160 MHz bandwidth.…”

Section: Testbed Characterizationmentioning

confidence: 99%

uScope

Nayak

Knightly

2021

Proceedings of the Twenty-Second International Symposium on Theory, Algorithmic Foundations, and Protocol Design for Mobile Net

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This paper presents uScope, an AP-side framework for validation of delay-based SLAs. Specically, uScope enables in the estimation of WLAN uplink latency for any of the associated STAs and decomposition into its constituent components. uScope does not require any form of active probing, no special purpose software installations on the STAs, nor any additional infrastructure to collect more information, and makes estimations solely based on passive AP-side observations. We implement uScope on a commodity hardware platform and conduct extensive eld trials on a university campus and in a residential apartment complex. In over 1 million tests, uScope demonstrates a high estimation accuracy with mean estimation errors under 10% for all the estimated parameters.

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Section: Testbed Characterizationmentioning

confidence: 99%

uScope

Nayak

Knightly

2021

Proceedings of the Twenty-Second International Symposium on Theory, Algorithmic Foundations, and Protocol Design for Mobile Net

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“…• Hardware design studies Works such as [16][17][18][19][20][21][22][23][24][25][26][27][28][29] have studied the impact of enhancing hardware design via smart and compact antenna designs. While an efficient antenna design is crucial to achieve a good system performance, the issues we highlight in this report need to be addressed via improvements to protocol design.…”

Section: Related Workmentioning

confidence: 99%

Performance Evaluation of MU-MIMO Under the Impact of Open Loop Traffic Dynamics

Nayak

2021

Preprint

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Multi-user MIMO enhances throughput by simultaneously transmitting/receiving parallel data streams to/from a group of users. However, the throughput analysis does not account for variable data traffic. The research objective of this project is to analyze the effect of variable traffic as it will change the system behaviour. The two characteristic features of variable traffic viz. packet size variation and traffic burstiness have been considered for the analysis in this project. Their effects have been studied individually to provide an insight into the problem. Through simulations, we show that in certain scenarios the system performance of MU-MIMO deteriorates significantly due to both packet size variations and traffic burstiness individually even under ideal conditions with respect to channel variations, channel correlation, mobility, etc. Furthermore, we show that under bursty traffic with higher offered load the aggregate throughput first remains steady until a certain peak to average rate ratio and then deteriorates linearly instead of exponentially. Also, under high amount of traffic burstiness, the throughputs are independent of the aggregation rates. A thorough analysis is provided to explain these two phenomena. This is the first research work that considers the impact of variable traffic on the performance of MU-MIMO. Therefore, the implications for MAC protocol design are significant.

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“…Sensing and communicating antennas are the basic RF structure of a CR system, where the sensing antenna always a UWB antenna used for wireless channel continuous monitoring of unutilized frequency bands, while the communicating antenna performs the communication through those channels [6]. There a re four techniques applied to produce frequency reconfigurable antennas, they are electrical, optical, physical, and smart materials reconfigurations.…”

Section: Introductionmentioning

confidence: 99%

Compact tri-band T-shaped frequency reconfigurable antenna for cognitive radio applications

Jabber

Thaher

2020

Bulletin EEI

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This paper presents, new compact tri-band and broadband frequency reconfigurable antenna for cognitive radio applications. The proposed antenna consists of an Ultrawideband sensing antenna and reconfigurable communicating antenna at the same substrate. The sensing antenna is a UWB printed elliptical monopole antenna operates at frequency band from 2.72 to 23.8 GHz which can cover the entire UWB frequency band from 3.1 to 10.6 GHz and cover the broadband up to 20 GHz. The communicating antenna is a T-shaped frequency reconfigurable antenna operates on three bands of 7.925 GHz, 13.16 GHz, and 14.48 GHz under (S11≤-10 dB) with a fractional bandwidth of 14.55%, 6.2%, and 3.3% respectively. The proposed antenna used to operate in two modes one for cognitive radio applications to cover WiMAX, land, Fixed and Mobile satellite, Radar, and broadband applications. The frequency reconfigurability is obtained by using only one RF switch (PIN diode) for changing the operating frequency. The antenna overall dimensions are 42x30x1.6 mm3 printed on an FR-4 epoxy substrate with relative dielectric constant εr=4.3, loss tangent tan (δ)=0.002 and 50Ω microstrip line feed. The maximum obtained simulated gain is 8.5 dB at 13.16 GHz. The S11 is under -20 dB and coupling between the two antennas is less than -15 dB at the resonant frequencies.

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Ultrawideband (UWB) antenna design for cognitive radio

Cited by 7 publications

References 11 publications

uScope

uScope

Performance Evaluation of MU-MIMO Under the Impact of Open Loop Traffic Dynamics

Compact tri-band T-shaped frequency reconfigurable antenna for cognitive radio applications

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