• Title/Summary/Keyword: Random signal

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Sampling Phase Detector for NRZ Random Bit Synchronization (NRZ Random Bit 동기를 위한 표본 위상 검출기)

  • 박세현;박세훈
    • Journal of Korea Multimedia Society
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    • v.3 no.6
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    • pp.652-660
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    • 2000
  • This paper proposes a new type of sampling Phase Detector (SPD) for NRZ random bit synchronization circuit. The proposed SPD calculates the mean value of phase difference between bit interval of input signal and period of local reference. Simulated and experimental results show that the proposed SPD is applicable to the phase detector for NRZ random signal. finally the Random NRZ bit synchronization circuit. is designed and implemented by using SPD.

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Design of a Fuzzy Controller Using the Parallel Architecture of Random Signal-based Learning (병렬형 랜덤 신호 기반 학습을 이용한 퍼지 제어기의 설계)

  • Han, Chang-Wook;Oh, Se-Jin
    • Journal of the Institute of Convergence Signal Processing
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    • v.12 no.1
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    • pp.62-66
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    • 2011
  • This paper proposes a parallel architecture of random signal-based learning (PRSL), merged with simulated annealing (SA), to optimize the fuzzy logic controller (FLC). Random signal-based learning (RSL) finds the local optima very well, whereas it can not finds the global optimum in a very complex search space because of its serial nature. To overcome these difficulties, PRSL, which consists of serial RSL as a population, is considered. Moreover, SA is added to RSL to help the exploration. The validity of the proposed algorithm is conformed by applying it to the optimization of a FLC for the inverted pendulum.

Application of Radiations for Random Noise (형광물질의 방사선을 응용한 Random Nois)

  • J. K. Lee
    • 전기의세계
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    • v.13 no.3
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    • pp.8-12
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    • 1964
  • The study of the research for Random process have been recently increasing rapidly. There are many methods in generating of Random signal, however, mainly these are dependent upon utilizing of hot noise of resistance and noise of discharge tube. Consequently, it is not easy to obtain of Random Noise of stabilized low frequency. Therefore, I like to study over the result of principle and design in the method of obtaining the Random Noise with faint radiations of fluoresence materials.

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Signal Processing(II)-Detection and Estimation of Random Process, Karhunen Lo$\grave{e}$ve Expansion, SVD of an Image) (신호처리(II)-Random Process의 detection 및 estimation Karhunen.Loeve의 전개, 한 서상의 SVD)

  • 안수길
    • Journal of the Korean Institute of Telematics and Electronics
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    • v.17 no.1
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    • pp.1-9
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    • 1980
  • In this paper several basic techniques for signal processing and analysis are surveyed. Firstly by the intervention of the uncertainty principle, an equality sign may have different degree of precision if non commutable operators are applied. Seconds y maximum entropy estimate and randam process based viewpoint must be enhanced to get rid of the well established and reigning deterministic image of science. Thirdly techniques for the analysis of a signal namely detection. ess]motion and modulation are explained as well as the positive definiteness of a covariance function, Karhunen-Loeve expansion and SVD of an image.

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Comparison of Detection Probability for Conventional and Time-Reversal (TR) Radar Systems

  • Yoo, Hyung-Ha;Koh, Il-Suek
    • Journal of electromagnetic engineering and science
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    • v.12 no.1
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    • pp.70-76
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    • 2012
  • We compare the detection probabilities of the time-reversal(TR) detection system and the conventional radar system. The target is assumed to be hidden inside a random medium such as a forest. We propose a TR detection system based on the SAR(Synthetic Aperture Radar) algorithm. Unlike the conventional SAR images, the proposed TR-SAR system has an interesting property. Specifically, the target-related signal components due to the time-reversal refocusing characteristics, as well as some of clutter-related signal components are concentrated at the time-reversal reference point. The remaining clutter-related signal components are scattered around that reference point. In this paper, we model the random media as a collection of point scatterers to avoid unnecessary complexities. We calculate the detection probability of the TR radar system based on the proposed simple random media model.

High Order Template Scheme for Rapid Acquisition in the UWB Communication System (고차 모델을 사용한 광대역 통신 시스템의 새로운 고속 동기화 기법)

  • Baasantseren, Gansuren;Lin, Xiaoju;Lee, Hae-Kee;Kim, Sung-Soo
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.59 no.1
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    • pp.47-52
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    • 2010
  • The low power of ultra-wideband (UWB) signal makes the acquisition of UWB signal be a more challenging task. In this paper, we propose the method of high order template signal technique that reduces the synchronization time. Experimental results are presented to show the improvements of performance in the mean acquisition time (MAT) and the probability of detection. The performance compared with the serial search, the truly random search and the random permutation search. It is shown that over typical UWB multipath channels, a random permutation search scheme may yield lower MAT than serial search.

Design of a Fuzzy Controller Using Genetic Algorithms Employing Random Signal-Based Learning (랜덤 신호 기반 학습의 유전 알고리즘을 이용한 퍼지 제어기의 설계)

  • Han, Chang-Uk;Park, Jeong-Il
    • Journal of Institute of Control, Robotics and Systems
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    • v.7 no.2
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    • pp.131-137
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    • 2001
  • Traditional genetic algorithms, though robust, are generally not the most successful optimization algorithm on only particular domian. Hybridizing a genetic algorithm with other algorithms can produce better performance than both the genetic algorithm and the other algorithms. This paper describes the application of random signal-based learning to a genetic algorithm in order to get well tuned fuzzy rules. The key of tis approach is to adjust both the width and the center of membership functions so that the tuned rule-based fuzzy controller can generate the desired performance. The effectiveness of the proposed algorithm is verified by computer simulation.

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A Nonparametric Method for Random Signal Detection in Signal-Dependent Noise : Two-Sample Case (신호 의존성 잡음에서 확률 신호 검파를 위한 비모수 방법 : 두 표본을 쓰는 경우)

  • Kim, Chang-Bae;Song, Ik-Ho;Bae, Jin-Su
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.28 no.4C
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    • pp.374-378
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    • 2003
  • The asymptotic performance of the two-sample locally optimum rank detector for random signals buried in signal-dependent noise and additive noise is consigered in this paper. It is shown that the locally optimum rank detector, a nonparametric detector, has reasonable asymptotic performance for a class of correlated random signals, compared with the locally optimum detector. It is noteworthy that the the two-sample locally optimum rank detector perform almost the same with the one-sample locally optimum rank detector.

Generalization of the Spreading Function and Weyl Symbol for Time-Frequency Analysis of Linear Time-Varying Systems

  • Iem, Byeong-gwan
    • Journal of the Korean Institute of Intelligent Systems
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    • v.11 no.7
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    • pp.628-632
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    • 2001
  • We propose time-frequency (TF) tools for analyzing linear time-varying (LTV) systems and nonstationary random processes. Obtained warping the narrowband Weyl symbol (WS) and spreading function (SF), the new TF tools are useful for analyzing LTV systems and random processes characterized by generalized frequency shifts, This new Weyl symbol (WS) is useful in wideband signal analysis. We also propose WS an tools for analyzing systems which produce dispersive frequency shifts on the signal. We obtain these generalized, frequency-shift covariant WS by warping conventional, narrowband WS. Using the new, generalized WS, we provide a formulation for the Weyl correspondence for linear systems with instantaneous of linear signal transformation as weighted superpositions of non-linear frequency shifts on the signal. Application examples in signal and detection demonstrate the advantages of our new results.

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A Method for Reduction of Spurious Signal in Digital RF Memory (디지털 고주파 기억 장치에서의 스퓨리어스 신호 저감 방법)

  • Kang, Jong-Jin
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.22 no.7
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    • pp.669-674
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    • 2011
  • In this paper, a method for reduction of spurious signal in Digital RF Memory(DRFM) is proposed. Spurious response is a major performance issue of DRFM. This method is based on mixing a random phase LO signal into input IF signal and sampling it. The random phase LO signal is generated by high speed phase shifting characteristic of Direct Digital Synthesizer(DDS). Through this technique, we achieved an enhancement of 5~10 dB of spurious response.