Takafumi HAYASHI


A Novel Construction of Tree-Structured Zero-Correlation Zone Sequence Sets
Takafumi HAYASHI Yodai WATANABE Takao MAEDA Shinya MATSUFUJI 
Publication:   
Publication Date: 2017/10/01
Vol. E100-A  No. 10  pp. 2187-2194
Type of Manuscript:  LETTER
Category: Coding Theory
Keyword: 
zero-correlation zoneternary sequencebinary treeinter-subset zero-correlation zone
 Summary | Full Text:PDF(437KB)

A Novel Class of Quadriphase Zero-Correlation Zone Sequence Sets
Takafumi HAYASHI Yodai WATANABE Toshiaki MIYAZAKI Anh PHAM Takao MAEDA Shinya MATSUFUJI 
Publication:   
Publication Date: 2017/04/01
Vol. E100-A  No. 4  pp. 953-960
Type of Manuscript:  Special Section LETTER (Special Section on Signal Design and Its Applications in Communications)
Category: Sequences
Keyword: 
optimal zero-correlation zonequadriphaseQS-CDMAAS-CDMA
 Summary | Full Text:PDF(182.1KB)

Parameterization of High-Dimensional Perfect Sequences over a Composition Algebra over R
Takao MAEDA Yodai WATANABE Takafumi HAYASHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2015/12/01
Vol. E98-A  No. 12  pp. 2439-2445
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Sequence
Keyword: 
correlation functionperfect sequencehigh-dimensional sequenceparameterizationFourier transformconvolution
 Summary | Full Text:PDF(537.1KB)

A Novel Class of Zero-Correlation Zone Sequence Set Having a Low Peak-Factor and a Flat Power Spectrum
Takafumi HAYASHI Yodai WATANABE Anh T. PHAM Toshiaki MIYAZAKI Shinya MATSUFUJI Takao MAEDA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2015/12/01
Vol. E98-A  No. 12  pp. 2429-2438
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Sequence
Keyword: 
optimal zero-correlation zonelow peak-factorpseudo-white noiseperfect sequence
 Summary | Full Text:PDF(1.6MB)

Low-Peak-Factor Pseudo-White-Noise Sequence Set with Optimal Zero-Correlation Zone
Takafumi HAYASHI Takao MAEDA Shigeru KANEMOTO Shinya MATSUFUJI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2014/12/01
Vol. E97-A  No. 12  pp. 2343-2351
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Communication Theory and Signals
Keyword: 
optimal zero-correlation zonelow peak factorpseudo white noiseperfect sequence
 Summary | Full Text:PDF(1.1MB)

Fourier Analysis of Sequences over a Composition Algebra of the Real Number Field
Takao MAEDA Takafumi HAYASHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2013/12/01
Vol. E96-A  No. 12  pp. 2452-2456
Type of Manuscript:  Special Section LETTER (Special Section on Information Theory and Its Applications)
Category: Sequence
Keyword: 
Fourier analysisconvolutioncomposition algebracorrelation functionperfect sequence
 Summary | Full Text:PDF(101.4KB)

Parameterization of Perfect Sequences over a Composition Algebra
Takao MAEDA Takafumi HAYASHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2012/12/01
Vol. E95-A  No. 12  pp. 2139-2147
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Sequence
Keyword: 
parameterizationperfect sequenceautocorrelationcomposition algebraquaternionoctonion
 Summary | Full Text:PDF(617.7KB)

A Generalized Construction Scheme of a Zero-Correlation Zone Sequence Set with a Wide Inter-Subset Zero-Correlation Zone
Takafumi HAYASHI Takao MAEDA Shinya MATSUFUJI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2012/11/01
Vol. E95-A  No. 11  pp. 1931-1936
Type of Manuscript:  Special Section LETTER (Special Section on Signal Design and Its Applications in Communications)
Category: Sequences
Keyword: 
sequence designspreading sequenceCDMA communicationZCZsynthetic aperture focusinginter-subset ZCZ
 Summary | Full Text:PDF(106.2KB)

A Ternary Zero-Correlation Zone Sequence Set Having Wide Inter-Subset Zero-Correlation Zone
Takafumi HAYASHI Takao MAEDA Shinya MATSUFUJI Satoshi OKAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2011/11/01
Vol. E94-A  No. 11  pp. 2230-2235
Type of Manuscript:  Special Section LETTER (Special Section on Information Theory and Its Applications)
Category: Sequence
Keyword: 
ternary sequencezero-correlation zoneHadamard matrixinter-subset correlationinter-cellmutually orthogonal complementary sets
 Summary | Full Text:PDF(103KB)

Parameterization of Perfect Arrays of Real Numbers
Takao MAEDA Takafumi HAYASHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2011/11/01
Vol. E94-A  No. 11  pp. 2178-2187
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Digital Signal Processing
Keyword: 
parameterizationperfect arrayperfect sequenceautocorrelation
 Summary | Full Text:PDF(291KB)

A Generalized Construction of Zero-Correlation Zone Sequence Set with Sequence Subsets
Takafumi HAYASHI Takao MAEDA Satoshi OKAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2011/07/01
Vol. E94-A  No. 7  pp. 1597-1602
Type of Manuscript:  LETTER
Category: Spread Spectrum Technologies and Applications
Keyword: 
finite-length sequencesequence subsetsinter-subset zero-correlationzero-correlation zoneaperiodic correlation functionperiodic correlation function
 Summary | Full Text:PDF(100.1KB)

Parameterization of Perfect Sequences of Real Numbers
Takao MAEDA Takafumi HAYASHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2011/06/01
Vol. E94-A  No. 6  pp. 1401-1407
Type of Manuscript:  PAPER
Category: Digital Signal Processing
Keyword: 
perfect sequenceparameterizationzero-correlation zone
 Summary | Full Text:PDF(328.7KB)

On a ZCZ Code Including a Sequence Used for a Synchronization Symbol
Shinya MATSUFUJI Takahiro MATSUMOTO Tomohiro HAYASHIDA Takafumi HAYASHI Noriyoshi KUROYANAGI Pingzhi FAN 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2010/11/01
Vol. E93-A  No. 11  pp. 2286-2290
Type of Manuscript:  Special Section PAPER (Special Section on Signal Design and its Application in Communications)
Category: Sequences
Keyword: 
ZCZ codematched filtercorrelationCDMAshort-range communications
 Summary | Full Text:PDF(834.5KB)

A Generalized Construction of Optimal Zero-Correlation Zone Sequence Set from a Perfect Sequence Pair
Takafumi HAYASHI Shinya MATSUFUJI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2010/11/01
Vol. E93-A  No. 11  pp. 2337-2344
Type of Manuscript:  Special Section LETTER (Special Section on Signal Design and its Application in Communications)
Category: Sequences
Keyword: 
sequence designspreading sequenceCDMA communicationZCZsynthetic aperture focusing
 Summary | Full Text:PDF(130.9KB)

Zero-Correlation Zone Sequence Set Constructed from a Perfect Sequence and a Complementary Sequence Pair
Takafumi HAYASHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2008/07/01
Vol. E91-A  No. 7  pp. 1676-1681
Type of Manuscript:  Special Section LETTER (Special Section on Multi-dimensional Mobile Information Networks)
Category: 
Keyword: 
sequence designspreading sequenceCDMA communicationzero-correlation zoneperfect sequenceGolay complementary sequence pair
 Summary | Full Text:PDF(99.7KB)

A Novel Class of Zero-Correlation Zone Sequence Sets Constructed from a Perfect Sequence
Takafumi HAYASHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2008/04/01
Vol. E91-A  No. 4  pp. 1233-1237
Type of Manuscript:  LETTER
Category: Coding Theory
Keyword: 
sequence designspreading sequenceCDMA communicationzero-correlation zoneperfect sequencesynthetic aperture imaging
 Summary | Full Text:PDF(82.4KB)

An Integrated Sequence Construction of Binary Zero-Correlation Zone Sequences
Takafumi HAYASHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2007/10/01
Vol. E90-A  No. 10  pp. 2329-2335
Type of Manuscript:  LETTER
Category: Coding Theory
Keyword: 
binary sequencezero-correlation zoneHadamard matrixsequence designmutually orthogonal complementary sets
 Summary | Full Text:PDF(103.5KB)

Zero-Correlation Zone Sequence Set Construction Using an Even-Perfect Sequence and an Odd-Perfect Sequence
Takafumi HAYASHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2007/09/01
Vol. E90-A  No. 9  pp. 1871-1875
Type of Manuscript:  Special Section LETTER (Special Section on Information Theory and Its Applications)
Category: 
Keyword: 
ternary sequencezero-correlation zoneperfect sequenceodd-perfect sequence
 Summary | Full Text:PDF(78.7KB)

Zero-Correlation Zone Sequence Set Constructed from a Perfect Sequence
Takafumi HAYASHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2007/05/01
Vol. E90-A  No. 5  pp. 1107-1111
Type of Manuscript:  LETTER
Category: Coding Theory
Keyword: 
sequence designspreading sequenceCDMA communicationzero-correlation zoneperfect sequence
 Summary | Full Text:PDF(78.8KB)

Binary Zero-Correlation Zone Sequence Set Construction Using a Cyclic Hadamard Sequence
Takafumi HAYASHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2006/10/01
Vol. E89-A  No. 10  pp. 2649-2655
Type of Manuscript:  Special Section PAPER (Special Section on Information Theory and Its Applications)
Category: Sequences
Keyword: 
binary sequencezero-correlation zonecyclic difference setcyclic Hadamard sequencemutually orthogonal complementary sets
 Summary | Full Text:PDF(151.2KB)

On Optimal Construction of Two Classes of ZCZ Codes
Takafumi HAYASHI Shinya MATSUFUJI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2006/09/01
Vol. E89-A  No. 9  pp. 2345-2350
Type of Manuscript:  Special Section LETTER (Special Section on Sequence Design and its Application in Communications)
Category: 
Keyword: 
sequence designspreading sequenceCDMA communicationzero correlation zone
 Summary | Full Text:PDF(104.6KB)

Ternary Sequence Set Having Periodic and Aperiodic Zero-Correlation Zone
Takafumi HAYASHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2006/06/01
Vol. E89-A  No. 6  pp. 1825-1831
Type of Manuscript:  PAPER
Category: Coding Theory
Keyword: 
ternary sequencefinite-length sequencezero-correlation zoneaperiodic correlation functionperiodic correlation function
 Summary | Full Text:PDF(142KB)

A Class of Two-Dimensional Signal Having a Flat Power Spectrum and a Low Peak Factor
Takafumi HAYASHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2006/02/01
Vol. E89-A  No. 2  pp. 494-502
Type of Manuscript:  PAPER
Category: Digital Signal Processing
Keyword: 
pseudo-white noisepeak factorcrest factorperfect array
 Summary | Full Text:PDF(238.1KB)

Binary Zero-Correlation Zone Sequence Set Constructed from an M-Sequence
Takafumi HAYASHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2006/02/01
Vol. E89-A  No. 2  pp. 633-638
Type of Manuscript:  LETTER
Category: Coding Theory
Keyword: 
binary sequencezero-correlation zoneM-sequenceshift-register sequence
 Summary | Full Text:PDF(94.7KB)

Binary Zero-Correlation Zone Sequence Set Construction Using a Primitive Linear Recursion
Takafumi HAYASHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2005/07/01
Vol. E88-A  No. 7  pp. 2034-2038
Type of Manuscript:  LETTER
Category: Coding Theory
Keyword: 
binary sequencezero-correlation zoneM-sequenceshift-register sequence
 Summary | Full Text:PDF(88.8KB)

Upper Bounds of the Correlation Functions of a Class of Binary Zero-Correlation-Zone Sequences
Takafumi HAYASHI Takao MAEDA Satoshi OKAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2005/03/01
Vol. E88-A  No. 3  pp. 791-794
Type of Manuscript:  LETTER
Category: Coding Theory
Keyword: 
zero-correlationbinary sequenceupper bounds
 Summary | Full Text:PDF(78.3KB)

A Construction of Low-Peak-Factor Pseudo White Noise
Takafumi HAYASHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2004/12/01
Vol. E87-A  No. 12  pp. 3429-3432
Type of Manuscript:  LETTER
Category: Digital Signal Processing
Keyword: 
pseudo white noisepeak factorcrest factor
 Summary | Full Text:PDF(85.2KB)

A Class of Low-Peak-Factor Pseudo White Noise Sequence
Takafumi HAYASHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2004/08/01
Vol. E87-A  No. 8  pp. 1850-1854
Type of Manuscript:  Special Section PAPER (Special Section on Digital Signal Processing)
Category: Theory of Signals
Keyword: 
pseudo white noisepeak factorcrest factor
 Summary | Full Text:PDF(108.2KB)

A Class of Ternary Sequence Sets with a Zero-Correlation Zone
Takafumi HAYASHI Satoshi OKAWA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2004/06/01
Vol. E87-A  No. 6  pp. 1591-1598
Type of Manuscript:  PAPER
Category: Coding Theory
Keyword: 
ternary sequencefinite-length sequencezero-correlation zoneeven correlation functionodd correlation function
 Summary | Full Text:PDF(290.2KB)

A Generalization of Binary Zero-Correlation Zone Sequence Sets Constructed from Hadamard Matrices
Takafumi HAYASHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2004/01/01
Vol. E87-A  No. 1  pp. 286-291
Type of Manuscript:  LETTER
Category: Coding Theory
Keyword: 
binary sequencezero-correlation zoneHadamard matricessequence design
 Summary | Full Text:PDF(581.6KB)

Ternary Array Set Having a Zero-Correlation Zone
Takafumi HAYASHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2003/08/01
Vol. E86-A  No. 8  pp. 2163-2167
Type of Manuscript:  LETTER
Category: Coding Theory
Keyword: 
ternary arrayzero-correlation zoneaperiodic correlation functionperiodic correlation function
 Summary | Full Text:PDF(146.7KB)

A Class of Ternary Sequence Sets with a Zero-Correlation Zone for Periodic, Aperiodic, and Odd Correlation Functions
Takafumi HAYASHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2003/07/01
Vol. E86-A  No. 7  pp. 1850-1857
Type of Manuscript:  PAPER
Category: Spread Spectrum Technologies and Applications
Keyword: 
ternary sequencefinite-length sequencezero-correlation zoneaperiodic correlation functionodd correlation function
 Summary | Full Text:PDF(215.9KB)

Binary Sequences with Orthogonal Subsequences and a Zero-Correlation Zone: Pair-Preserving Shuffled Sequences
Takafumi HAYASHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2002/06/01
Vol. E85-A  No. 6  pp. 1420-1425
Type of Manuscript:  LETTER
Category: Coding Theory
Keyword: 
zero-correlationbinary sequencespread spectrum communicationpseudo-noisesequence design
 Summary | Full Text:PDF(160KB)

The Synthesis of Low-Peak Orthogonal-Base-Set Sequences Using Trigonometric Function Aliasing
Takafumi HAYASHI William L. MARTENS 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2000/08/25
Vol. E83-A  No. 8  pp. 1513-1522
Type of Manuscript:  Special Section PAPER (Special Section on Digital Signal Processing)
Category: Theory of Signals
Keyword: 
low peak factorpseudo-white-noiseorthogonal basespread spectrum communicationaudio signal processing
 Summary | Full Text:PDF(595.7KB)

The Synthesis of Low-Peak Cross-Correlation Sequences Using Trigonometric Function Aliasing
Takafumi HAYASHI William L. MARTENS 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1999/08/25
Vol. E82-A  No. 8  pp. 1402-1411
Type of Manuscript:  Special Section PAPER (Special Section on Digital Signal Processing)
Category: 
Keyword: 
low peak factorpseudo white noisecross-correlationconvolution Reed-Solomon codespread spectrum communication
 Summary | Full Text:PDF(522.7KB)

Synthesis of Low Peak-to-Peak Waveforms with Flat Spectra
Takafumi HAYASHI 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1998/09/25
Vol. E81-A  No. 9  pp. 1902-1908
Type of Manuscript:  PAPER
Category: Circuit Theory
Keyword: 
low peak-to-peak factor waveformDFTwhite noisemulti-frequencyacoustical measurement
 Summary | Full Text:PDF(449.9KB)