Ching-Hsiang Tseng

Taiwan Semiconductor Manufacturing Company (Taiwan)

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

David G. Cory

University of Waterloo

Ronald L. Walsworth

University of Maryland, College Park

G. P. Wong

Harvard University

R. W. Mair

Athinoula A. Martinos Center for Biomedical Imaging

Timothy F. Havel

Massachusetts Institute of Technology

Shyamal Somaroo

Pfizer (United States)

E. R. Oteiza

Coherent (United States)

E.J. Powers

Baylor University Medical Center

F. W. Hersman

Xemed (United States)

V. R. Pomeroy

University of New Hampshire

Cooperative Institutions

Taiwan Semiconductor Manufacturing Company (Taiwan)

National Yang Ming Chiao Tung University

Harvard University

National Taiwan Ocean University

Massachusetts Institute of Technology

National Taiwan University

National Cheng Kung University

United Microelectronics (Taiwan)

Taiwan Semiconductor Manufacturing Company (United States)

IIT@MIT

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

On identifying Volterra transfer functions of cubically nonlinear systems using minimally sampled data

Ching-Hsiang Tseng

A practical method for identifying cubically nonlinear systems is presented in this paper. This method identifies the system by using the higher-order spectra of the system input and output. Compared to the conventional method, which requires the system output to be sampled at six times the bandwidth of the input, the proposed method only requires the system output to be sampled at twice the bandwidth of the system input. This greatly reduces the required computation and processing speed of the circuits. The advantage of the proposed method over the conventional one is demonstrated via computer simulation.

10.1109/host.1997.613504

Cite

Citations (0)

Shock Test for CRTs (情報ディスプレイ--The 6th Asian Symposium on Information Display & Exhibition)

映像情報メディア学会技術報告 (2000)

Ching-Hsiang Tseng Wen‐Chi Chen

CRTS

Source

Cite

Citations (0)

MAXI J1807+132: Lulin observations find substantial optical variability during the X-ray fading phase

ATel (2017)

A. K. H. Kong Ruolan Jin Ching-Hsiang Tseng E. T. Lin

Source

Cite

Citations (1)

Bandpass sampling criteria for nonlinear systems

IEEE Transactions on Signal Processing (2002)

Ching-Hsiang Tseng

Sampling criteria for nonlinear systems with a band-pass input are developed in this paper. It is well known that nonlinear systems may produce an output signal with a larger bandwidth than that of their input signal. According to the Nyquist sampling theorem, the sampling rate needs to be at least twice the maximum frequency of the output signal; otherwise, the sampled output would be aliased. However, if the input is a bandpass signal, the spectrum of the output signal often occupies multiple frequency bands. In this case, it is possible, by using the bandpass sampling concept, to sample the output signal at a rate much lower than the Nyquist sampling frequency. In this paper, all conditions in which bandpass sampling can be achieved are derived for nonlinear systems up to the third order. Furthermore, for nonlinear systems higher than the third order, some conditions in which bandpass sampling can be guaranteed are derived. The result can be used to choose an appropriate sampling frequency for nonlinear systems of an arbitrary order.

Nyquist–Shannon sampling theorem

Nyquist rate

Coherent sampling

Oversampling

SIGNAL (programming language)

Nyquist frequency

10.1109/78.984739

Cite

Citations (21)

Quantum simulation of a three-body-interaction Hamiltonian on an NMR quantum computer

Physical Review A (1999)

Ching-Hsiang Tseng Shyamal Somaroo Yehuda Sharf Emanuel Knill Raymond Laflamme

Extensions of average Hamiltonian theory to quantum computation permit the design of arbitrary Hamiltonians, allowing rotations throughout a large Hilbert space. In this way, the kinematics and dynamics of any quantum system may be simulated by a quantum computer. A basis mapping between the systems dictates the average Hamiltonian in the quantum computer needed to implement the desired Hamiltonian in the simulated system. The flexibility of the procedure is illustrated with NMR on ${}^{13}\mathrm{C}$ labeled alanine by creating the nonphysical Hamiltonian ${\ensuremath{\sigma}}_{z}{\ensuremath{\sigma}}_{z}{\ensuremath{\sigma}}_{z}$ corresponding to a three-body interaction.

Hamiltonian (control theory)

Quantum system

10.1103/physreva.61.012302

Cite

Citations (123)

Nonlinear Channel Estimation for Minimally Sampled Baseband OFDM Systems

IEEE Transactions on Communications (2021)

Ching-Hsiang Tseng Jen-Ho Cheng

The orthogonal frequency-division multiplexing (OFDM) is a widely used modulation scheme in modern digital communication systems. An OFDM signal can be susceptible to channel nonlinearities due to its high peak-to-average power ratio (PAR). This makes estimation and compensation of nonlinear channels particularly vital for OFDM systems. In this paper, we consider identifying cubically nonlinear channels in baseband OFDM systems using minimally sampled input and output signals. Unlike nonlinear channels in bandpass OFDM systems, which can be modeled by a complex baseband equivalent Volterra series with only odd order terms, the nonlinear channel in a baseband OFDM system requires a real Volterra series with both even and odd order terms. The minimally sampled input and output signals of the baseband OFDM system are used to estimate the frequency-domain Volterra kernels of the nonlinear channel. Due to the possible spectral regrowth caused by the channel nonlinearities, the minimally sampled output signal could be aliased. Nevertheless, by conducting higher-order statistical analyses on the OFDM signals, we show that closed form expressions of the Volterra kernels can still be derived. As a result of the closed form expressions, a simple estimate for the Volterra kernels is attained. Furthermore, the derived Volterra kernel estimate is shown to achieve the minimum mean square error (MMSE). Therefore, the proposed approach indeed provides an efficient yet accurate way to estimate nonlinear channels in baseband OFDM systems.

Volterra series

10.1109/tcomm.2021.3104031

Cite

Citations (0)

Direct downconversion of multiband RF signals using bandpass sampling

IEEE Transactions on Wireless Communications (2006)

Ching-Hsiang Tseng Sun-Chung Chou

Abstract-Bandpass sampling can be used by radio receivers to directly digitize the radio frequency (RF) signals. Although the bandpass sampling theory for single-band RF signals is well established, its counterpart for multiband RF signals is relatively immature. In this paper, we propose a novel and efficient method to find the ranges of valid bandpass sampling frequency for direct downconverting multiband RF signals. Simple formulas for the ranges of valid bandpass sampling frequency in terms of the frequency locations of the multiple RF bands are derived. The result can be used to design a multiband receiver for software defined radios.

Radio equipment

10.1109/twc.2006.1576530

Cite

Citations (100)

A stop-and-go dual-mode algorithm for blind equalization

Ching-Hsiang Tseng Cheng-Bin Lin

A dual-mode algorithm which incorporates a stop-and-go technique for blind equalization is investigated. The constant modulus algorithm (CMA) exhibits very slow convergence when applied to QAM signals. To speed up the convergence rate, a dual-mode CMA was developed. We show that the convergence properties of the dual-mode CMA can be significantly improved by simply adding a stop-and-go technique. The operation of the stop-and-go dual mode CMA is independent of the carrier offset and thus can be used even when the carrier offset is unknown.

Dual mode

Blind equalization

Mode (computer interface)

QAM

10.1109/glocom.1996.587681

Cite

Citations (20)

COMMUNICATIONS Gradient-Echo Imaging Considerations for Hyperpolarized 129 Xe MR

Lei Zhao R Obert Mulkern Ching-Hsiang Tseng Dominique A. Williamson Samuel Patz

Echo (communications protocol)

Gradient echo

Source