A power and time efficient radio architecture for LDACS1 air-to-ground communication

Shreejith, Shanker; Ambede, Abhishek; Vinod, A. P.; Fahmy, Suhaib A.

doi:10.1109/dasc.2016.7778043

Cited by 8 publications

(28 citation statements)

References 17 publications

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“…Software APIs can enable detailed reconfiguration of the hardware (the entire baseband or parts of it) from within the cognitive layer [27]. Such architectures have been demonstrated for LDACS [6]. We integrate the proposed correlator into this platform and evaluate the performance in actual hardware in addition to software simulations.…”

Section: Fpgas As Radio Platformsmentioning

confidence: 99%

“…The simplified diagram in Fig. 6 shows the architecture of our radio platform for LDACS [6] on a Xilinx Zynq device. The Zynq architecture integrates a dual core ARM processor and a programmable fabric on the same chip, enabling tight coupling between software and hardware processing blocks.…”

Section: Integration Into Ldacs Radio Platformmentioning

confidence: 99%

“…The platform offers high speed dynamic adaptability through parametric reconfiguration (for tuning parameters) and highspeed partial reconfiguration, which can be initiated through simple software APIs. An Analog Devices AD-FMCOMMS4-EBZ board (based on the AD9364) connects to the antenna interface to complete the RF front-end (see [6] for more details on our LDACS radio platform).…”

Section: Integration Into Ldacs Radio Platformmentioning

confidence: 99%

“…6, the correlator module (marked as Mlesscorr) interfaces with the output of the partially reconfigurable region (PRR) that holds either the channelizer or the channel filter (depending on the operating mode). We have replaced the filter-bank based spectrum sensing scheme in [6] with an optimal channelizer for LDACS and the channel filter with the work proposed in [29] to reduce multiplication complexity. During a sensing operation, the channelizer output is also read by the correlator module which then determines if there is an LDACS air-to-ground frame transmitted in the channel.…”

Section: Integration Into Ldacs Radio Platformmentioning

confidence: 99%

“…The introduction of digital processing blocks can also enable intelligent and on-demand spectrum allocation in LDACS, further enhancing its appeal in aeronautical systems [3]. Use of cognitive radio (CR) based dynamic spectrum access has been proposed for LDACS, which would enable opportunistic and on-demand access to the L-band channel(s) while meeting the reliability and safety requirements imposed by the standard [4]- [6]. This allows an aircraft to identify vacant spectral bands in the air-to-ground spectrum and choose a suitable channel to initiate an LDACS air-to-ground transmission.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Efficient Spectrum Sensing for Aeronautical LDACS Using Low-Power Correlators

Shreejith

Mathew

Prasad

et al. 2018

IEEE Trans. VLSI Syst.

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Section: Fpgas As Radio Platformsmentioning

confidence: 99%

Section: Integration Into Ldacs Radio Platformmentioning

confidence: 99%

Section: Integration Into Ldacs Radio Platformmentioning

confidence: 99%

Section: Integration Into Ldacs Radio Platformmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Efficient Spectrum Sensing for Aeronautical LDACS Using Low-Power Correlators

Shreejith

Mathew

Prasad

et al. 2018

IEEE Trans. VLSI Syst.

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An Adaptive Energy Detection Scheme with Real-Time Noise Variance Estimation

Mathew

Shreejith

Vinod

et al. 2019

Circuits Syst Signal Process

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Energy detection-based spectrum sensing techniques are ideally suited for power-constrained cognitive radio applications because of their lower computational complexity compared to feature detection techniques. However, their detection performance is dependent on multiple factors like accuracy of noise-variance estimation and signal to noise ratio (SNR). Many variations of energy detection techniques have been proposed to address these challenges; however they achieve the desired detection accuracy at the cost of increased computational complexity. This restricts the use of enhanced energy detection schemes in power-constrained applications such as aeronautical communication. In this paper, an adaptive lowcomplexity energy detection scheme is proposed for spectrum sensing in an L-band Digital Aeronautical Communication System (LDACS) at lower SNR levels. Our scheme uses a real time noise variance estimation technique using autocorrelation which is induced by the cyclic prefix property in LDACS signals. The proposed technique does not incur dedicated hardware blocks for noise variance estimation, leading to an efficient hardware implementation of the scheme without significant resource overheads. The simulation studies of the proposed scheme shows that the desired accuracy (90% detection accuracy with only 10% of false alarms) can be achieved even at -16.5 dB SNR, significantly lowering the SNR wall over existing energy detection schemes.

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New Spectrum Efficient Reconfigurable Filtered-OFDM Based L-Band Digital Aeronautical Communication System

Agrawal

Darak

Bader

2019

IEEE Trans. Aerosp. Electron. Syst.

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To meet an ever-increasing demand of the spectrum for aeronautical communication, we propose new L-band digital aeronautical communication system (LDACS) using reconfigurable filtered OFDM (Ref-OFDM). The proposed protocol enables transceivers to dynamically adapt the transmission bandwidth over a wide range to meet the desired quality of service, and high out-of-band attenuation leads to significant improvement in the vacant spectrum utilization. We support our claims via simulation and complexity comparison results for various realistic channel conditions.

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A power and time efficient radio architecture for LDACS1 air-to-ground communication

Cited by 8 publications

References 17 publications

Efficient Spectrum Sensing for Aeronautical LDACS Using Low-Power Correlators

Efficient Spectrum Sensing for Aeronautical LDACS Using Low-Power Correlators

An Adaptive Energy Detection Scheme with Real-Time Noise Variance Estimation

New Spectrum Efficient Reconfigurable Filtered-OFDM Based L-Band Digital Aeronautical Communication System

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