Solving the Spectrum Crisis: Intelligent, Reconfigurable Microwave Transmitter Amplifiers for Cognitive Radar

Baylis, Charles; Fellows, Matthew; Cohen, Lawrence S.; Marks, Robert J.

doi:10.1109/mmm.2014.2321253

Cited by 93 publications

(31 citation statements)

References 32 publications

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“…We assume that the radar designers have already developed a transmit beampattern profile that meets the operational radar needs. The original transmit beampattern, B o (u), is described by the beamformer, w o , producing the beampattern 1]. The radar's primary function takes place at the mainlobe of the transmit beampattern,…”

Section: Proposed Robust Radar-embedded Sidelobe Modulation: Methodsmentioning

confidence: 99%

“…Spectrum congestion and interference between systems is a modern problem that tends to get worse because of the growth of new applications and their demand for greater bandwidths . Many alternatives have been proposed to deal with the coexistence of radar and communications, eg, interference mitigation techniques, spectrum sharing of radar and communications, and dual‐functionality platforms, where waveform and sensors are jointly managed for both radar and communication functions …”

Section: Introductionmentioning

confidence: 99%

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Robust sidelobe amplitude and phase modulation for dual‐function radar‐communications

Ferreira

Sampaio‐Neto

Fortes

2018

Trans Emerging Tel Tech

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In this paper, we address the topic of sidelobe modulation in dual‐function radar‐communication platforms, which consists in embedding communication messages into the radar emissions by varying the phase and/or amplitude values of the radar transmit beampattern at a receiver direction within the sidelobe. An advantage of this type of communication link is that it is inherently secure as the communication symbol is transmitted correctly only at a specific direction. However, this advantage may become a major problem, causing an expressive decrease in performance, if the real receiver position does not match exactly the predefined one. This scenario easily arises from the relative movement between the radar and the receiver. We propose 2 original methods for embedding the sidelobe amplitude/phase modulation into the radar transmit beampattern that have simple closed‐form equations and are robust to small angular errors in the receiver's direction. We also propose a noncoherent signaling strategy for sidelobe phase modulation and present its analytical bit error rate expression for the binary case. Simulation results and comparisons illustrate the advantages of the proposed techniques.

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Section: Proposed Robust Radar-embedded Sidelobe Modulation: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Robust sidelobe amplitude and phase modulation for dual‐function radar‐communications

Ferreira

Sampaio‐Neto

Fortes

2018

Trans Emerging Tel Tech

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“…2 The major cases are 0/1 loss function for probabilistic action a t and 0/1 loss for ON/OFF non-stochastic observations, see [19,29,30] for analysis and [29,30,109] for Starkov codes, Hedge algorithm, and game theory approaches for sequential prediction. …”

Section: Endnotesmentioning

confidence: 99%

“…Spectrum scarcity has been a major research topic for the past few decades [1,2]. Fixed spectrum allocation inefficiency has generated a proliferation of dynamic spectrum access solutions to accommodate the growing demand for wireless and mobile applications.…”

Section: Introductionmentioning

confidence: 99%

Statistical spectrum occupancy prediction for dynamic spectrum access: a classification

Eltom

Kandeepan

Evans

et al. 2018

J Wireless Com Network

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Spectrum scarcity due to inefficient utilisation has ignited a plethora of dynamic spectrum access solutions to accommodate the expanding demand for future wireless networks. Dynamic spectrum access systems allow secondary users to utilise spectrum bands owned by primary users if the resulting interference is kept below a pre-designated threshold. Primary and secondary user spectrum occupancy patterns determine if minimum interference and seamless communications can be guaranteed. Thus, spectrum occupancy prediction is a key component of an optimised dynamic spectrum access system. Spectrum occupancy prediction recently received significant attention in the wireless communications literature. Nevertheless, a single consolidated literature source on statistical spectrum occupancy prediction is not yet available in the open literature. Our main contribution in this paper is to provide a statistical prediction classification framework to categorise and assess current spectrum occupancy models. An overview of statistical sequential prediction is presented first. This statistical background is used to analyse current techniques for spectrum occupancy prediction. This review also extends spectrum occupancy prediction to include cooperative prediction. Finally, theoretical and implementation challenges are discussed.

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“…Real-time impedance matching is demonstrated in the literature [5,6], and Qiao demonstrates a tunable amplifier using a genetic algorithm for low-power communication applications [7]. Baylis discusses the criticality of reconfigurable transmitter power amplifiers for "solving the spectrum crisis" [8].…”

Section: Introductionmentioning

confidence: 99%

Circuit optimization algorithms for real-time spectrum sharing between radar and communications

Baylis

Fellows

Barkate

et al. 2016

2016 IEEE Radar Conference (RadarConf)

Self Cite

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The ability of radar and communication applications to share the radio spectrum will require the use of innovative agile circuit techniques for radar and communications. Reconfigurable circuits can provide real-time adjustment of operating frequency and spectral output, while maintaining system performance and maximizing power efficiency. This paper discusses recent developments in circuit optimization techniques for power efficiency and spectral performance. Optimization of a single parameter (load reflection coefficient) for multiple criteria is first addressed, followed by multiple-parameter, multiple-criteria optimizations. The use of the recently innovated Smith Tube to optimize additional parameters, such as input power and bias voltage, simultaneously with the load impedance is discussed. Optimization examples and a forward look to fast, emerging multidimensional circuit optimization techniques are provided.Index Terms -Smith Chart, power amplifiers, optimization, power-added efficiency, adjacent-channel power ratio.

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Solving the Spectrum Crisis: Intelligent, Reconfigurable Microwave Transmitter Amplifiers for Cognitive Radar

Cited by 93 publications

References 32 publications

Robust sidelobe amplitude and phase modulation for dual‐function radar‐communications

Robust sidelobe amplitude and phase modulation for dual‐function radar‐communications

Statistical spectrum occupancy prediction for dynamic spectrum access: a classification

Circuit optimization algorithms for real-time spectrum sharing between radar and communications

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