H
Hideki Imai
Researcher at Chuo University
Publications - 490
Citations - 9741
Hideki Imai is an academic researcher from Chuo University. The author has contributed to research in topics: Encryption & Public-key cryptography. The author has an hindex of 42, co-authored 490 publications receiving 9258 citations. Previous affiliations of Hideki Imai include University of Tokyo & National Institute of Advanced Industrial Science and Technology.
Papers
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Journal ArticleDOI
Reduced complexity iterative decoding of low-density parity check codes based on belief propagation
TL;DR: Two simplified versions of the belief propagation algorithm for fast iterative decoding of low-density parity check codes on the additive white Gaussian noise channel are proposed, which greatly simplifies the decoding complexity of belief propagation.
Journal ArticleDOI
Performance analysis of deliberately clipped OFDM signals
Hideki Ochiai,Hideki Imai +1 more
TL;DR: The channel capacity of the oversampled and clipped OFDM signals over the additive white Gaussian noise and ideally interleaved Rayleigh fading channels is discussed and it is shown that the SNR penalty due to the clipping can be considerably alleviated by using optimal coding and reducing the information data rate.
Journal ArticleDOI
On the distribution of the peak-to-average power ratio in OFDM signals
Hideki Ochiai,Hideki Imai +1 more
TL;DR: A simple closed-form approximation for the distribution of the peak-to-average power ratio (PAPR) in strictly band-limited orthogonal frequency-division multiplexing (OFDM) signals is developed, based on the level-crossing rate analysis.
Book ChapterDOI
Conjunctive Broadcast and Attribute-Based Encryption
TL;DR: A new cryptosystem called Broadcast ABE is proposed, used to construct ABE systems with direct revocation mechanism, and appears to be the first fully-functional directly revocable schemes for key-policy and ciphertext-policy.
Journal ArticleDOI
How to construct efficient signcryption schemes on elliptic curves
Yuliang Zheng,Hideki Imai +1 more
TL;DR: This analysis shows that when compared with signaturethen-encryption on elliptic curves, signcryption on the curves represents a 58%saving in computational cost and a 40% saving in communication overhead.