Ultra Wideband Wireless Communication on the Base of Noise Technology

Калинин, В. И.; Panas, A. I.; Колесов, В. В.; Lyubchenko, V. E.

doi:10.1109/mikon.2006.4345254

Cited by 5 publications

(2 citation statements)

References 6 publications

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“…The extension of the signal bandwidth is usually achieved by such carrier wave modulation that forms a modulated signal with a bandwidth wider than the modulating function. An effective way of expanding the signal spectrum is its phase modulation [27].…”

Section: Estimation Of Noise Immunity Of Shrl Under the Effect Of Narmentioning

confidence: 99%

Noise Radar of Millimeter Range

Колесов¹,

Myasin²

2018

RENSIT

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Practically all modern users of radar systems require an increase in the number and quality of information obtained from the observed space. Multifunctionality and efficiency of modern radar systems can be provided by the development and application of effective broadband technologies, unconventional digital algorithms and new adaptive applied solutions for the problem of processing signals and images in order to identify and recognize various classes of low-contrast objects. In the work on the basis of the IMPATT noise generator, a noise radar model working in the 8-mm range and having a frequency spectrum of the noise signal frequency up to 1 GHz was developed and investigated. The layout of the model includes an IMPATT noise generator module based on a one-diode circuit operating in an 8-millimeter wavelength range with an integrated output power of 40 mW and a non-uniform spectral characteristic of about 6 dB. Receiving and transmitting modules include antennas, waveguide elements: matching elements, impedance matcher, directional couplers, detector heads and attenuators. The computerized control unit provided program-algorithmic support of operating modes and double spectral processing of the signal. An experimental study of the noise radar model in the laboratory demonstrated a high resolution over a range of 15 cm (with an effective bandwidth of 800-900 MHz). The noise immunity of a radio engineering channel model based on a spread-spectrum signal was experimentally investigated. The maximum noise immunity for a radio channel with spreading was determined by the signalto-noise ratio at the receiver input, at which signal restoration becomes impossible for a given averaging time. In the noise immunity experiment, two types of interference were used: sinusoidal interference, close in frequency to the transmitted signal, and broadband interference matched to the transmitted signal by the spectrum. The results of experiments showed that for both types of interference, the maximum noise immunity is ~25 dB. Thus, ultra-wideband radar technologies based on noise signals are characterized by good electromagnetic compatibility, can be effectively used in the compilation of a radar portrait of an object, as well as in monitoring, positioning and control systems operating under conditions of intense interference.

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Section: Estimation Of Noise Immunity Of Shrl Under the Effect Of Narmentioning

confidence: 99%

Noise Radar of Millimeter Range

Колесов¹,

Myasin²

2018

RENSIT

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“…And more recently the present author has given [9] tables of sets of possible critical exponents for d=2.5 that satisfy all known scaling and hyperscaling relationships, together with a fuller discussion of the possibility of d=2.5 Hausdorff dimensions. Kalinin has very recently observed fractal dimensions in his direct AFM measurement on nucleation of domains in ferroelectric switching processes [10]. Others have considered [11] that d might be 3/2 in ferroelectrics (Ref.…”

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confidence: 99%

Fractal Dimensions in Switching Kinetics of Ferroelectrics

Scott

2007

Ferroelectrics

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Early work by the author with Prof. Ishibashi [Scott et al., J. Appl. Phys. 64, 787 (1988)] showed that switching kinetics in ferroelectrics satisfy a constraint on current transients compatible with d = 2.5 dimensionality. At that time with no direct observations of the domains, it was not possible to conclude whether this was a true Hausdorff dimension or a numerical artefact caused by an approximation in the theory (which ignored the dependence of domain wall velocity upon domain diameter). Recent data suggest that the switching dimensionality is truly fractal with d = 2.5. The critical exponent β characterizing the order parameter P(T) can be written as a continuous function, which is exact within hyperscaling; here ν and η are the exponents characterizing the pair correlation function G(r,T) and the structure factor S(q,T). For d=2.5 the estimate is that β is approximately ¼. I. IntroductionTwenty years ago the author used current transients i(t) = dD/dt to determine details about switching kinetics in ferroelectric thin films; here t is time and D is the displacement vector, approximately equal to polarization P in a ferroelectric. The initial study [1] used potassium nitrate, KNO 3 , but similar studies of lead zirconate titanate PZT followed shortly thereafter [2]. Later work by Shur [3] extended this particular modelling technique. The theory used for this data-fitting was developed originally by Ishibashi and Takagi [4,5], and is based upon the analogous problem of grain growth in crystallization due to Avrami [6]. The theory is falsifiable in a nice way by the fact that it affords constraints that test the self-consistency of the model; in particular the dimensionless ratio i(p) t(p)/P s = Λ (1.)

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Performance of Non-Polarized Noise Modulated Communications System in the Presence of Interference

Chuang

Narayanan

2011

Wireless Pers Commun

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Ultra Wideband Wireless Communication on the Base of Noise Technology

Cited by 5 publications

References 6 publications

Noise Radar of Millimeter Range

Noise Radar of Millimeter Range

Fractal Dimensions in Switching Kinetics of Ferroelectrics

Performance of Non-Polarized Noise Modulated Communications System in the Presence of Interference

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