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Keiichi Kambara

dblp:50/3812 · DBLP profile ↗
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3ranked-venue papers
3as first author
0since 2021 · last 2008
—ORCID · none

Domains — the database's venue-derived domains; a paper can count in several

Computer networks · 1 · 1 first-author

Expertise — from the expertise taxonomy: the topics of the expert's papers under the CCF categories. A weight counts papers with recency: 1 for a paper about the topic, 0.3 when the topic is its context, halved every five years.

Computer networks
1 paper
Physical-layer communications · 100%

Topics — the 4 heaviest of 4, each with the papers that count most for it

TopicWeightPapersLastEvidence papers
Physical-layer communications
equalization		 0.112008
Subblock processing in MMSE-FDE under fast fading environments · IEEE J. Sel. Areas Commun. 2008
Physical-layer communications › equalization
frequency-domain equalization		 0.112008
Subblock processing in MMSE-FDE under fast fading environments · IEEE J. Sel. Areas Commun. 2008
Physical-layer communications
fading channels		 0.012008
Subblock processing in MMSE-FDE under fast fading environments · IEEE J. Sel. Areas Commun. 2008
Physical-layer communications › fading channels › time-varying fading channel
fast fading		 0.012008
Subblock processing in MMSE-FDE under fast fading environments · IEEE J. Sel. Areas Commun. 2008

Methods — techniques the papers use, named apart from their topics

subblock processing · 0.1pseudo cyclic prefix · 0.1
YearPublicationVenuePosition
2008 Subblock Processing for Frequency-Domain Turbo Equalization Under Fast Fading Environments
abstract
Frequency-domain equalization (FDE) has been studied for suppressing inter-symbol interference (ISI) due to frequency selective fading in single carrier systems. When a high- mobility terminal is assumed in the system, channel transition within an FFT block cannot be ignored. Then, the ISI reduction performance of FDE degrades since cyclicity of the channel matrix is lost. To solve this problem, a method of dividing the received data block into multiple subblocks has been proposed. In the paper, the subblock processing is applied to frequency-domain turbo equalization (FDTE). The results of numerical analysis show a remarkable improvement by the proposed method. Specifically, the FDTE with two-subblock processing can decrease the block error rate floor to less than 0.001 when the maximum Doppler frequency normalized by the block length is 0.4.
Keiichi Kambara, Hiroshi Nishimoto, Toshihiko Nishimura, Takeo Ohgane, Yasutaka Ogawa
 VTC Fall1
2008 Subblock processing in MMSE-FDE under fast fading environments
abstract
Frequency domain equalization (FDE) has been studied for reducing inter-symbol interference (ISI) caused by frequency selective fading in single carrier systems. When a high-mobility terminal exists in the system, the channel state may change within a DFT block. Then, the ISI reduction performance of FDE degrades since cyclicity of the channel matrix is lost. We propose to divide a received data block into multiple subblocks to decrease the channel transition within the DFT block in fast fading environments. Also, to satisfy periodicity of the received signal in each subblock, we introduce a pseudo cyclic prefix technique. The results of numerical analysis show that the proposed method can effectively decrease the error floor in fast fading environments.
Keiichi Kambara, Hiroshi Nishimoto, Toshihiko Nishimura, Takeo Ohgane, Yasutaka Ogawa
 IEEE J. Sel. Areas Commun.1
2007 Subblock Processing for MMSE-FDE Under Fast Fading Environments
abstract
Frequency domain equalization (FDE) has been studied for suppressing inter-symbol interference (ISI) caused by frequency selective fading in single carrier systems. When a high-mobility terminal exists in the system, channel state changes within a DFT block. Then, the ISI reduction performance of FDE degrades since cyclicity of the channel matrix is lost. Here, we propose to divide received data block into multiple subblocks to decrease the channel transition within the DFT block in fast fading environments. Also, to satisfy periodicity of the received signal in each subblock, we introduce a pseudo cyclic prefix technique. The results of numerical analysis show that the proposed method provides 1.3-fold increase in tolerable Doppler frequency for FER of 0.01.
Keiichi Kambara, Hiroshi Nishimoto, Toshihiko Nishimura, Yasutaka Ogawa, Takeo Ohgane
 VTC Spring1