Search query: system power noise analysis using modulated

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abstract: As the semiconductor industry advances to ever smaller technology nodes, the power distribution network (PDN) is becoming an essential design factor to ensure system performance and reliability. The time domain simulations typically utilize the chip power model (CPM) generated by Ansys RedHawk, as the current load. The typical CPM only includes current consumption in a few clock cycles, which includes the high frequencies components (several hundreds of MHz) but losing mid to low frequencies. This paper describes a modulated CPM (MCPM) design and signoff process for PDN. The first step is frequency domain analysis of PDN to identify the die package resonance frequency. Then the chip gate level simulation is performed over an extended period of time to generate the VPD (Value Change Dump plus) file, with realistic low to mid frequency current components. This information is then used to modulate the CPM as the current load for the system level time domain noise simulations. This PI analysis flow was validated using a set of three test cases, with reasonable simulation measurement correlation achieved. This analysis flow enables more effective power/ground plane layout optimization and capacitor optimization in a timely manner.
author_names: Di Hu

Yongxue Yu

Antonio Ferrario

Olivier Bayet

Lin Shen

Ravi Nimmagadda

F Bonardi

Francis Matus
title: System power noise analysis using modulated CPM
venue: 2015 IEEE Symposium on Electromagnetic Compatibility and Signal Integrity
year: 2015

abstract: Abstract The proposed system of a 450 nm blue GaN (Gallium Nitride) laser diode directly modulated by pre leveled 16 Quadrature Amplitude Modulation(QAM) Orthogonal Frequency Divisional Multiplexing (OFDM)data is implemented to achieve high transmission capacity upto 10.02 Gbits/sec. The simulation analysis will be done under sea water and tap water to enable underwater wireless optical communication(UOWC) over a distance of upto 12 m. The UWOC tap water provide an allowable bit rate decrease from 16.57 to 14.67 Gbps with the transmission distance significantly increased from 2 m to 6 m, exhibit bit/distance decay ratio of 0.236 Gbps/m. By performing Underwater Optical Wireless Communication (UOWC) in sea water, the impurities in sea water scattered the light causing attenuation of the blue laser power. This reduces the transmission capacity with a slightly higher decay ratio 0.410 Gbps/m. There are other noise sources in the sea produced by creatures or by natural and man made activities. All these noise are also taken into consideration so that the ambient noise are eliminated with the help of digital signal processing.
author_names: Kalimuthu Krishnan

Sabitha Gauni

C T Manimegalai

V Malsawmdawngliana
title: Ambient noise analysis in underwater wireless communication using laser diode
venue: Optics Laser Technology
year: 2019

abstract: The compact intensity modulated frequency modulated continuous wave (FMCW) laser range sensor has a low signal tonoise ratio(SNR) because the transmitting power is limited by heat dissipation conditions, and the detection performance is reduced in degraded visual environments. To increase the transmitting power and keep the heat low, the SNR enhancement technique using synchronized dual laser sources is proposed. This paper established a mathematical model of the echo signal of the dual laser sources, made a comparative analysis of the single and dual channel laser beat signal. Aimed at the problem of unsynchronization of the two modulated signals caused by the drive circuit, a phase synchronization algorithm based on sampling feedback was proposed and verified by simulation. Finally, a synchronized dual channel laser ranging system was built in the laboratory for experiments. Compared with a single channel laser, the synchronized dual channel laser transmitting power is doubled, and the echo signal SNR can be increased by 2.2dB. The experimental results indicate that the proposed SNR enhancement technique can effectively solve the problem of low SNR in compact intensity modulated FMCW laser range sensor.
author_names: Zhi Yong Tao

Zhonghua Huang

Zhongming Xiu
title: Signal to noise ratio enhancement in compact intensity modulated FMCW laser range sensor using synchronized dual laser sources
venue: International Conference on Digital Image Processing
year: 2021

abstract: In the proposed system, a 450nm blue laser diode is directly modulated by 16 Quadrature Amplitude Modulation (QAM) data which are orthogonal. The simulation is done by assuming underwater with ambient noise present in the underwater covering a distance of 20 meters. Due to the presence of noise and attenuation of the wireless medium, the optical power is decreased to a great extent. The photodetector converts the weak optical signal to electrical signal. The phase and amplitude of the signal is change caused by noise present in it. A Butterworth filter is implemented to obtain the original signal at the receiver side. It is shown that the output binary data has change due phase due to the corruption of the noise.
author_names: K Kalimuthu

Sabitha Gauni
title: Underwater optical wireless communication analysis using blue laser diode
year: 2018

abstract: In recent times there has been a wide interest in micro grids. One area of concern in micro grids is the generation of harmonics by active devices such as converters and FACTS devices used for reactive power compensation. The currently available literature focuses on the number of operations and fundamental cycles for estimating harmonics. This usually results in a trade off between accuracy of estimation and the choice of digital filter parameters. In this work a novel orthogonal frequency division multiplexing (OFDM) principle modified as per the power system scenario has been proposed. Odd harmonics up to 31st order are measured by demodulation as if the power signal is OFDM modulated. All these harmonics are measured using only one cycle of voltage signal. Instantaneous detection of harmonics is made possible using the Discrete Wavelet Transform (DWT) instead of the fast Fourier transforms used in conventional OFDM. DWT is also used for noise elimination before the harmonics are analyzed and the performance of proposed method is analyzed using PSNR under different noise conditions.
author_names: Srihari Mandava

Ramesh Varadarajan
title: Analysis of Power System Harmonics Using PSNR Metric
year: 2018

abstract: The system carries out the Measurement of reactor kinetic parameters and absolute power of zero Power Reactor in the delayed critical state,using reactor noise analysis technology.Two g compensation ionization chambers are placed symmetrically close to the core.After being detected in the chambers,the reactor neutron noise signal shall be modulated and collected by measurement system.Then the noise signal shall be analysed by the software based on Labview to get cross power spectral densities.The kinetic parameters are obtained from Nonlinear least squares fitting of cross power spectral densities.Absolute power of zero power reactor shall be obtained by algorithm.After field measurement,kinetic parameters and absolute power are identical with reactor operation parameters.
author_names: Liu Cai-xue
title: The Design of Absolute Power Measurement System of Zero Power Reactor Based on Reactor Noise Analysis Technology
year: 2009

abstract: Heart rhythm is modulated by the autonomic nervous system in order to adapt to changing cardiovascular loads. The resulting heart rate variability (HRV) is considered as one of the most promising non invasive markers of the activity of the autonomic nervous system. In this work, the possibility to analyze HRV with wavelet transform was investigated. Specifically, three methods of wavelet transform (CWT, CWTFT and DWT) were compared. DWT showed to be the best one because of the simplicity of decomposition, and quality of reconstruction, high time resolution as well as the shortest computation time and lowest CPU power consumption. DWT showed to have high noise robustness, excellent temporal and good frequency resolution and small influence of the mother wavelet type. ULF, HF and LF components of HRV were assessed using DWT transform. LF/HF ratio was extracted from HRV signal during voluntary breathing apneas and compared to the respiration signal. An increase in LF/HF ratio corresponding to the times of breathing apnea could be observed, indicating that the proposed method could reveal specific changes in the HRV and that LF/HF ratio could serve as a good indicator of breathing apnea.
author_names: Una Pale

Florian Thurk

Eugenijus Kaniusas
title: Heart rate variability analysis using different wavelet transformations
venue: 2016 39th International Convention on Information and Communication Technology, Electronics and Microelectronics (MIPRO)
year: 2016

abstract: A new approach to estimate the direction of arrival (DOA) in a Time Modulated Array (TMA) system with a bipolar squared periodic time modulating sequence is proposed in this letter. Using such a sequence can increase the power of harmonic components of the received signal. Based on this fact, we formulated a new parameter pertaining to the ratio of the upper and lower sideband first harmonic components of the received signal, to improve the accuracy of the DOA estimation in a low signal to noise ratio (SNR) environment. A numerical analysis was performed to verify the effectiveness of the proposed DOA estimation method.
author_names: Young-Woo Youn

Jeongphill Kim

Sangyeol Oh
title: Time Modulated Array System Controlled With Bipolar Squared Periodic Sequence for Direction of Arrival Estimation
venue: IEEE Wireless Communications Letters
year: 2021

abstract: Critical to real time oscillations monitoring is early detection when otherwise dormant natural modes become a serious threat to grid stability. The next urgent issue is to determine the frequency and damping of the problematic modes when the signal is embedded in noise and the system contains closely spaced natural modes. The present paper addresses the detection issue using the Teager Kaiser energy operator (TKEO) which has shown to be a fast predictor of the instability onset time when applied to the output signals of an orthogonal filter bank. In the system stability context, linear filter decomposition (LFD) is preferred rather than empirical mode decomposition (EMD) well known for its tendency to generate artificial modes with no physical meaning. A narrowband LFD with a less than 0.2 Hz bandwidth is achieved in the range 0.05 to 3 Hz through a cosine modulated filter bank design. The effectiveness of the scheme in accurately detecting and tracking the frequency and damping of oscillatory modes is demonstrated using Monte Carlo simulations of three closely spaced modes and a detailed analysis of an actual event recorded by Hydro Quebec's WAMS in 2006.
author_names: I Kamwa

Ashok Kumar Pradhan

Geza Joos
title: Robust Detection and Analysis of Power System Oscillations Using the Teager Kaiser Energy Operator
venue: IEEE Transactions on Power Systems
year: 2011

abstract: In this paper, MIMO is paired up with OFDM improve the performance of wireless transmission systems. Multiple antennas are employed both at the transmitting as well as receiving ends. The performance of an OFDM system is measured, considering multipath delay spread, channel noise, Rayleigh fading channel and distortion. In this paper, bits are generated and then mapped with modulation schemes such as QPSK, 8PSK, and QAM. Then, the mapped data is divided into blocks of 120 modulated data where a training sequence of the data is inserted both at the beginning and ending parts of the block. The equalization is used to determine the variation to the rest of data. The singular value decomposition (SVD) and water filling algorithm have been employed to measure the performance of the MIMO OFDM integrated systems. Therefore, the capacity is increased by transmitting different streams of data through different antennas at a same carrier frequency. Any inter symbol interference (ISI) produced after the transmission is recovered by using spatial sampling integrated with the signal processing algorithm. Furthermore, the performance remains the same with different combinations of transmitting and receiving antennas.
author_names: K Pavan Kumar Reddy

K Ramanjaneyulu

DR K Veeraswamy

Dr Ch Srinivasa Rao
title: POWER ALLOCATION ANALYSIS OF MIMO OFDM SYSTEM USING SVD AND WATER FILLING ALGORITHM
year: 2013