Chikato FUJIWARA


Inferring Network Impact Factors: Applying Mixed Distribution to Measured RTTs
Yasuhiro SATO Shingo ATA Ikuo OKA Chikato FUJIWARA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2009/04/01
Vol. E92-B  No. 4  pp. 1233-1243
Type of Manuscript:  PAPER
Category: Network
Keyword: 
delay characteristicsround trip time (RTT)mixed distributionnetwork behavior
 Summary | Full Text:PDF(1.8MB)

Effective Bit Selection Methods for Improving Performance of Packet Classifications on IP Routers
Gang QIN Shingo ATA Ikuo OKA Chikato FUJIWARA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2007/05/01
Vol. E90-B  No. 5  pp. 1090-1097
Type of Manuscript:  PAPER
Category: Switching for Communications
Keyword: 
patricia triecontent addressable memoryquality of servicebackbone routeredge router
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A Practical Approach for Coded OFDM with Partial Transmit Sequence
Tomoyuki MANDAI Ikuo OKA Marc P.C. FOSSORIER Shingo ATA Chikato FUJIWARA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2004/05/01
Vol. E87-B  No. 5  pp. 1273-1275
Type of Manuscript:  Special Section LETTER (Special Section on Mobile Multimedia Communications)
Category: 
Keyword: 
coded OFDMPTSpeak power reductionside informationrotationally invariant TCM
 Summary | Full Text:PDF(165.4KB)

An Application of Separate Coding to Space-Time Turbo-Coded Modulation
Kohsuke HARADA Shingo ATA Ikuo OKA Chikato FUJIWARA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2003/01/01
Vol. E86-B  No. 1  pp. 380-383
Type of Manuscript:  Special Section LETTER (Special Issue on Multiple Access and Signal Transmission Techniques for Future Mobile Communications)
Category: 
Keyword: 
space-time codingturbo-coded modulationRayleigh fading channel
 Summary | Full Text:PDF(247.6KB)

Exact Analysis of Bit Error Probability for 4-State Soft Decision Viterbi Decoding
Hideki YOSHIKAWA Ikuo OKA Chikato FUJIWARA Yoshimasa DAIDO 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2002/10/01
Vol. E85-A  No. 10  pp. 2263-2266
Type of Manuscript:  Special Section LETTER (Special Section on Information Theory and Its Applications)
Category: Coding Theory
Keyword: 
exact analysisbit error probabilitysoft decision Viterbi decoding
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Code Synchronization Error Control Scheme by Correlation of Received Sequence in Phase Rotating Modulation
Hideki YOSHIKAWA Ikuo OKA Chikato FUJIWARA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2000/08/25
Vol. E83-B  No. 8  pp. 1873-1879
Type of Manuscript:  Special Section PAPER (Special Issue on Personal, Indoor and Mobile Radio Communications)
Category: 
Keyword: 
code synchronization errorsymbol deletion/insertionphase rotating modulationcorrelation
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A Proposal of Simultaneous Spread of PPM in Frequency and Time Axes for Adaptive CDMA
Jinsong DUAN Ikuo OKA Chikato FUJIWARA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1999/12/25
Vol. E82-B  No. 12  pp. 2126-2135
Type of Manuscript:  PAPER
Category: Radio Communication
Keyword: 
spread spectrumspread timePPMCDMAdiscrete Fourier transformcapacity
 Summary | Full Text:PDF(728.9KB)

Symbol Error Probability of Time Spread PPM Signals in the Presence of Co-channel Interference
Jinsong DUAN Ikuo OKA Chikato FUJIWARA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1998/01/25
Vol. E81-B  No. 1  pp. 66-72
Type of Manuscript:  PAPER
Category: Communication Theory
Keyword: 
time spread PPMCDMAmomentsmaximum entropy methodsymbol error probability
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Error Probability of ALOHA Systems with Controlled Output Power
Mitsuyuki KISHIMOTO Ikuo OKA Chikato FUJIWARA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1995/07/25
Vol. E78-A  No. 7  pp. 805-811
Type of Manuscript:  Special Section PAPER (Special Section on Mobile Information Network)
Category: 
Keyword: 
ALOHAcontrolled output powererror probabilityPSKpower level distributionoptimal power level
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Bit Error Probability and Throughput Performance of Time Spread PPM/CDMA Systems
Xuping ZHOU Ikuo OKA Chikato FUJIWARA 
Publication:   IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 1992/12/25
Vol. E75-A  No. 12  pp. 1696-1701
Type of Manuscript:  Special Section PAPER (Special Section on Networks and Mobile Communications)
Category: 
Keyword: 
SS/CDMAtime spread PPMbit error probabilitythroughputtransmission efficiency
 Summary | Full Text:PDF(457.3KB)