10,585 resources related to Chirp
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2020 IEEE International Symposium on Antennas and Propagation and North American Radio Science Meeting
The joint meeting is intended to provide an international forum for the exchange of information on state of the art research in the area of antennas and propagation, electromagnetic engineering and radio science
Everything to do with radar hardware, techniques, processing and systems.
The IEEE International Microwave Symposium (IMS) is the world s foremost conference covering the UHF, RF, wireless, microwave, millimeter-wave, terahertz, and optical frequencies; encompassing everything from basic technologies to components to systems including the latest RFIC, MIC, MEMS and filter technologies, advances in CAD, modeling, EM simulation and more. The IMS includes technical and interactive sessions, exhibits, student competitions, panels, workshops, tutorials, and networking events.
The ICASSP meeting is the world's largest and most comprehensive technical conference focused on signal processing and its applications. The conference will feature world-class speakers, tutorials, exhibits, and over 50 lecture and poster sessions.
All fields of satellite, airborne and ground remote sensing.
No periodicals are currently tagged "Chirp"
2016 IEEE International Conference on Plasma Science (ICOPS), 2016
Summary form only given. Fine control over ion energy distributions (IEDs) in plasma material processing reactors is critical to producing the features required for next generation microelectronics. One promising way of increasing control is through the use of pulsed power. Methods such as inductively coupled power (ICP) pulsing, radio frequency (RF) biased substrate pulsing, and synchronously pulsed bias and ICP ...
Nonlinear Effects in Optical Fibers, None
1964 IEEE International Solid-State Circuits Conference. Digest of Technical Papers, 1964
2018 IEEE 4th International Conference on Computer and Communications (ICCC), 2018
The rapid development of Internet of Things (IoT) puts forward much requirements for wireless communication technology. Low Power Wide Area Networks (LPWAN) are designed for low bandwidth, low power, long range and large number of connected IoT applications. As one of the LPWAN, Low Power Long Range Transceiver (LoRa) described as a Frequency Shift Chirp Modulation (FSCM), is widely concerned ...
2011 XXXth URSI General Assembly and Scientific Symposium, 2011
Digital signal classification using clustering has many applications in the civilian and military domains. Most of the proposed classifiers can only recognize a few types of digital signals. This paper presents a novel technique that deals with the classification of multi-user chirp modulation signals using clustering techniques. In this technique, a combination of higher order moments and cumulants are proposed ...
A Fully Integrated 75-83GHz FMCW Synthesizer for Automotive Radar Applications with -97dBc/Hz Phase Noise at 1MHz Offset and 100GHz/mSec Maximal Chirp Rate: RFIC Industry Showcase 2017
Summary form only given. Fine control over ion energy distributions (IEDs) in plasma material processing reactors is critical to producing the features required for next generation microelectronics. One promising way of increasing control is through the use of pulsed power. Methods such as inductively coupled power (ICP) pulsing, radio frequency (RF) biased substrate pulsing, and synchronously pulsed bias and ICP power have previously been investigated . Additional control over the IED can be gained by applying a frequency chirped bias power over a pulsed cycle. Chirped power is where the frequency is modulated in a predictable way, such as through a linear or exponential increase in frequency with time. Applied frequency greatly affects the IED, where close bimodal peaks are observed at high frequency and wide asymmetric peaks are observed for lower frequencies . When averaged over the pulsed cycle, varied applied frequency can, therefore, be used to create a customized IED.In addition to increasing IED control, chirped power can be used to enhance power matching with pulsed plasmas. When pulsing an ICP power source, plasma impedance rapidly varies over the pulse cycle due to variations in electron density and impedance of the discharge. Applied chirped power enables the frequency to be pre-emptively adjusted to match these variations and minimize the amount of reflected power. Chirped power can therefore be an effective tool to ensure optimal power transfer for pulsed plasma operation. The behavior of chirped pulsed bias power for an Ar/Cl2 inductively coupled plasma was investigated using the Hybrid Plasma Equipment Model (HPEM) - a 2D fluid hydrodynamics plasma simulation . IEDs will be discussed with the ICP power operating in continuous wave mode with a chirped RF bias. Similarly, the effect of chirped power on power transfer efficiency will be discussed while pulsing the ICP power with the RF bias operating in chirped mode.
The rapid development of Internet of Things (IoT) puts forward much requirements for wireless communication technology. Low Power Wide Area Networks (LPWAN) are designed for low bandwidth, low power, long range and large number of connected IoT applications. As one of the LPWAN, Low Power Long Range Transceiver (LoRa) described as a Frequency Shift Chirp Modulation (FSCM), is widely concerned and studied. This paper analyzes the physical layer of LoRa, presents a basic mathematical signal processing model, and proposes a demodulation algorithm based on Fast Fourier Transform (FFT). The simulation performance of the demodulation algorithm is compared with the theoretical performance one of quadrature modulation incoherent detection. The results show that the performance derived through these two approaches is consistent. In addition, the performance of LoRa system with residual frequency offset under different spread factor (SF) is analyzed, and verified that the performance of the system decreases with the increase of SF. So we have to adopt better algorithm to correct frequency offset, otherwise the coverage will decrease significantly.
Digital signal classification using clustering has many applications in the civilian and military domains. Most of the proposed classifiers can only recognize a few types of digital signals. This paper presents a novel technique that deals with the classification of multi-user chirp modulation signals using clustering techniques. In this technique, a combination of higher order moments and cumulants are proposed as the effective features. Simulation results show that the proposed technique is able to classify the different types of chirp signals in additive white Gaussian noise (AWGN) channels and fuzzy c-means clustering (FCM) outperform fuzzy k-means clustering (FKM).
This paper presents the new radio network technology and applications capability for the “LoRa” systems, which ensure long range data transfer, very high number of local subscribers and low power consume. Although this standard provides low data rates, it is intended to be a solution for sensor networks, that don't need too much information to be transmitted at a specific time. The expectation is that LoRa standard to become, next years, the main data carrier for Smart Cities' infrastructures.
A class of chirp signals for M-ary data transmission, referred to as M-ary chirp modulation (MCM), is considered. The performance analysis of this MCM over frequency-selective and -nonselective fading channels is carried out and closed-form error probability results that are easy for numerical computation are derived. The parameters that affect error performance are identified and illustrated. These analytical results are then compared using extensive Monte Carlo simulations. Specifically, the results are presented over Rayleigh and Nakagami-m flat fading and over Nakagami-m frequency-selective channels. It is shown that analytical results compare well with simulations.
M-ary chirp modulated signals are described and illustrated as a function of modulation parameters-h, the peak-to-peak frequency deviation divided by the symbol rate; and w, the frequency sweep width divided by the symbol rate. The detection of these signals in AWGN channel is addressed and optimum receiver structures for both coherent and non-coherent cases are derived. Closed-form expressions for symbol error probabilities for these receivers have been obtained. Optimum 2-, 4-, and 8-ary coherent chirp systems that minimize symbol error rate have been determined. The performances of both coherent and non-coherent M-ary chirp systems are compared with respective conventional M-ary digital modulations.
We propose a time-frequency representation based on the ridges of the continuous chirplet transform to identify both fast transients and components with well-defined instantaneous frequency in noisy data. At each chirplet modulation rate, every ridge corresponds to a territory in the time-frequency plane such that the territories form a partition of the time-frequency plane. For many signals containing sparse signal components, ridge length and ridge stability are maximized when the analysis kernel is adapted to the signal content. These properties provide opportunities for enhancing signal in noise and for elementary stream segregation by combining information across multiple analysis chirp rates.
Waveform diversity design is a vital issue in multiple-input multiple-output (MIMO) synthetic aperture radar (SAR) systems because the waveforms should have good orthogonality, high coherence, and large time-bandwidth product. However, most of the existing waveforms are not suitable for MIMO SAR and difficult to be implemented in a real-life scene. This letter investigates a scheme for designing chirp modulation diversity waveforms with large time- bandwidth product, constant modulus, implementation simplicity, good Doppler tolerance, and orthogonality. The four waveforms are orthogonal on both transmit and receive. The waveform performances are investigated through the correlation and ambiguity functions. Numerical results validate the superiorities of the designed four waveforms in MIMO SAR high-resolution imaging.
No standards are currently tagged "Chirp"