Faculty Profiles - MIYAMOTO Shinichi

Published Papers - MIYAMOTO Shinichi

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A Proposal of WLAN Systems Using a Virtual Dedicated Channel Scheme to Enhance High-throughput Transmission Opportunities

Shunsuke TSUTSUMI, Yusuke HIRANO, Shinichi MIYAMOTO （Part： Corresponding author )

The transactions of the Institute of Electronics, Information and Communication Engineers. B 108-B ( 3 ) 136 - 146 2025.03 [Refereed]

DOI

A study of secure communication with secret sharing method in MIMO eigen stream parallel channels

Masaaki Yamanaka, Shigenori Kinjo, Shinichi Miyamoto

IEICE Communications Express ( Institute of Electrical and Electronics Engineers (IEEE) ) 13 ( 3 ) 72 - 75 2024.03 [Refereed]

DOI

Distributed Transmission for Secure Wireless Links Based on a Secret-sharing Method

Masaaki Yamanaka, Wei Shencong, Zou Jingbo, Shuichi Ohno, Shinichi Miyamoto, Seiichi Sampei

IEICE Trans. on Commun. E102-B ( 12 ) 2286 - 2296 2019.12 [Refereed]

Dynamically Controlled Transmission Standby in WLAN Systems

Yukio Kojima, Shinichi Miyamoto

IEICE Communications Express 8 ( 6 ) 213 - 218 2019.03 [Refereed]

Transmission Standby based on Channel Conditions for Efficient Use of Radio Resources in WLAN Systems

Yukio Kojima, Shinichi Miyamoto

2018 Asia-Pacific Microwave Conference (APMC 2018) 165 - 167 2018.11 [Refereed]

Study on Secure Distributed Transmission in Two-way Wireless Communication Links

Masaaki Yamanaka, Zou Jingbo, Shuichi Ohno, Shinichi Miyamoto, Seiichi Sampei

5th IEEE GLOBECOM Workshop on Trusted Communications with Physical Layer Security 978 2017.12 [Refereed]

Millimeter-Wave Wireless LAN and Its Extension toward 5G Heterogeneous Networks

Kei Sakaguchi, Ehab Mahmoud Mohamed, Hideyuki Kusano, Makoto Mizukami, Shinichi Miyamoto, Roya E. Rezagah, Koji Takinami, Kazuaki Takahashi, Naganori Shirakata, Hailan Peng, Toshiaki Yamamoto, Shinobu Nanba

IEICE TRANSACTIONS ON COMMUNICATIONS ( IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG ) E98B ( 10 ) 1932 - 1948 2015.10 [Refereed] [Invited]

Millimeter-wave (mmw) frequency bands, especially 60 GHz unlicensed band, are considered as a promising solution for giga-bit short range wireless communication systems. IEEE standard 802.11ad, also known as WiGig, is standardized for the usage of the 60 GHz unlicensed band for wireless local area networks (WLANs). By using this mmw WLAN, multi-Gbps rate can be achieved to support bandwidth-intensive multimedia applications. Exhaustive search along with beamforming (BF) is usually used to overcome 60 GHz channel propagation loss and accomplish data transmissions in such mmw WLANs. Because of its short range transmission with a high susceptibility to path blocking, multiple number of mmw access points (APs) should be used to fully cover a typical target environment for future high capacity multi-Gbps WLANs. Therefore, coordination among mmw APs is highly needed to overcome packet collisions resulting from un-coordinated exhaustive search BF and to increase total capacity of mmw WLANs. In this paper, we firstly give the current status of mmw WLANs with our developed WiGig AP prototype. Then, we highlight the great need for coordinated transmissions among mmw APs as a key enabler for future high capacity mmw WLANs. Two different types of coordinated mmw WLAN architecture are introduced. One is distributed antenna type architecture to realize centralized coordination, while the other is autonomous coordination with the assistance of legacy Wi-Fi signaling. Moreover, two heterogeneous network (HetNet) architectures are also introduced to efficiently extend the coordinated mmw WLANs to be used for future 5th Generation (5G) cellular networks.

DOI

Wide Coverage Area Creation with Radiation-constraint Nodes Based on Distributed Radiation Suppression Using a Secret Sharing Method

Masaaki Yamanaka, Shinichi Miyamoto, Seiichi Sampei

情報処理学会論文誌 ( Information Processing Society of Japan (IPSJ) ) 56 ( 2 ) 460 - 469 2015.02 [Refereed]

The authors will propose a wide coverage area creation method in an indoor wireless communication environment with radiation-constraint wireless nodes within a condition that the transmitted information can only be conveyed in an indoor wireless space. The authors have proposed a radiation suppression technique to create such a highly secured indoor communication environment. However due to the strict limitation of the radiation constraint, the coverage area will be deeply shrunken when decent radio suppression cannot be attained at the node. This paper will propose a distributed radiation suppression technique using a secret sharing method to widen the coverage area of the indoor wireless network by relaxing the radiation constraint imposed on the wireless nodes. Computer simulation confirms that a wide coverage area can be created in an indoor wireless space while suppressing information leakage to the outside of the network.

Multi-Stage DCF-Based Channel Access Scheme for Throughput Enhancement of OFDMA WLAN Systems

Shinichi Miyamoto, Naoya Ikeshita, Seiichi Sampei, Wenjie Jiang

IEICE TRANSACTIONS ON COMMUNICATIONS ( IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG ) E97B ( 10 ) 2230 - 2242 2014.10 [Refereed]

To enhance the throughput of wireless local area networks (WLANs) by efficiently utilizing the radio resource, a distributed coordination function-based (DCF-based) orthogonal frequency division multiple access (OFDMA) WLAN system has been proposed. In the system, since each OFDMA sub-channel is assigned to the associated station with the highest channel gain, the transmission rate of DATA frames can be enhanced thanks to multi-user diversity. However, the optimum allocation of OFDMA sub-channels requires the estimation of channel state information (CSI) of all associated stations, and this incurs excessive signaling overhead. As the number of associated stations increases, the signaling overhead severely degrades the throughput of DCF-based OFDMA WLAN. To reduce the signaling overhead while obtaining a sufficient diversity gain, this paper proposes a channel access scheme that performs multiple DCF-based channel access. The key idea of the proposed scheme is to introduce additional DCF-based prioritized access along with the traditional DCF-based random access. lathe additional DCF-based prioritized access, by dynamically adjusting contention window size according to the CSI of each station, only the stations with better channel state inform their CSI to the access point (AP), and the signaling overhead can be reduced while maintaining high multi-user diversity gain. Numerical results confirm that the proposed channel access scheme enhances the throughput of OFDMA WLAN.

DOI

Group-based Centralized Radio Resource Management Strategies in Wireless Local Area Networks

Shinichi Miyamoto, Seiichi Sampei

2014 XXXITH URSI GENERAL ASSEMBLY AND SCIENTIFIC SYMPOSIUM (URSI GASS) ( IEEE ) 2014 [Refereed] [Invited]

To improve the transmission performance of wireless local area networks (WLANs), this paper proposes a distributed coordination function-based (DCF-based) medium access control (MAC) protocol that enables centralized radio resource management (RRM). In the protocol, AP and associated stations form a cooperative group, and the central controller acts as a master to organize the access of associated stations. Once the cooperative group reserves the radio resource in a traditional DCF-manner, the central controller allocates the reserved radio resources to the stations by an orthogonal frequency division multiple access (OFDMA) scheme. Since the central controller dynamically allocates the fine-grained resource blocks (RBs) to the stations through the opportunistic two-dimensional scheduling based on the channel and traffic conditions of each station, the transmission opportunities can be granted to the appropriate stations. Numerical results confirm that the proposed protocol enhance the throughput while satisfying QoS requirements.

Wide-area Centralized Radio Resource Management for DCF-based Multi-hop Ad hoc Wireless Networks

Shinichi Miyamoto, Naoki Hayata, Seiichi Sampei, Wenjie Jiang

2014 INTERNATIONAL CONFERENCE ON COMPUTING, NETWORKING AND COMMUNICATIONS (ICNC) ( IEEE ) 710 - 715 2014 [Refereed]

This paper proposes a novel medium access control (MAC) protocol that enables a wide area centralized radio resource management (RRM) in a distributed coordination function (DCF)-based multi-hop wireless network. In the proposed protocol, after the acquisition of transmission opportunity in a DCF-manner, a source station (STA) attempts to forward a medium reservation advertisement (MRA) frame to a destination STA. MRA forwarding enables multiple STAs constituting a multi-hop network to reserve the radio resource for their exclusive use throughout multi-hop wide area. MRA forwarding is also utilized to gather channel state information (CSI) and traffic state information (TSI) of STAs at the central controller that is adaptively selected from the STAs. After the MRA forwarding, based on the CSI and TSI of each STA, the central controller dynamically allocates the resource blocks (RBs) to the appropriate STAs through the opportunistic two-dimensional scheduling using OFDMA scheme. Assigned RB information is notified to STAs by relaying transmission schedule advertisement (TSA) frame, and the STAs send DATA frames on the allocated RBs. Numerical simulation confirms that the proposed scheme enhances the end-to-end throughput of multi-hop network.

Realization of Secure Ambient Wireless Network System Based on Spatially Distributed Ciphering Function

Masashi Okada, Masahide Hatanaka, Keiichiro Kagawa, Shinichi Miyamoto

IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES ( IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG ) E96A ( 11 ) 2182 - 2184 2013.11 [Refereed]

This paper proposes a secure wireless network system required for an ambient information society; it forms a privacy zone wherein terminals can securely communicate secret information using an arbitrary general radio channel. For this system, we introduce a scheme using a side-information from a special node. The information is used as an encryption key so that the detectable region of the key defines a privacy zone. We implement the scheme on the basis of IEEE 802.15.4 and realize the world's first ambient network platform with the above functionality. An experiment and demonstration show the effectiveness of the proposed system.

DOI

Station clustering strategy for DCF-based centralized OFDMA WLAN systems

Takuya Endo, Shinichi Miyamoto, Seiichi Sampei, Wenjie Jiang

2013 International Conference on Connected Vehicles and Expo, ICCVE 2013 - Proceedings ( IEEE Computer Society ) 343 - 349 2013 [Refereed]

To enhance the throughput of orthogonal frequency division multiple access (OFDMA) wireless local area network (WLAN) systems, this paper proposes a stations-clustering strategy in which stations in the basic service set (BSS) are grouped into clusters. In the proposed scheme, initially, to obtain statistics required for calculating the expected throughput achieved by OFDMA WLAN when the stations are grouped into a certain clustered-pattern, the access point (AP) and all stations belong to the same cluster and transmit DATA frames for a certain period. After that, the AP calculates the expected throughput for all clustered-patterns and chooses a clustered-pattern that maximizes the expected throughput. Then, the stations are grouped into clusters in accordance with the selected clustered-pattern, and the stations within the same cluster share the radio resource by OFDMA WLAN scheme. Numerical simulation confirms that the proposed scheme can maximize throughput performance by introduction of dynamic station clustering in the single BSS environment and it is also effective in preventing channel state information (CSI) feedback blocking due to station exposition in the overlapping BSS environment. © 2013 IEEE.

DOI

Novel DCF-based Multi-User MAC Protocol and Dynamic Resource Allocation for OFDMA WLAN Systems

Takuya Mishima, Shinichi Miyamoto, Seiichi Sampei, Wenjie Jiang

2013 INTERNATIONAL CONFERENCE ON COMPUTING, NETWORKING AND COMMUNICATIONS (ICNC) ( IEEE ) 616 - 620 2013 [Refereed]

To enhance the throughput of wireless local area networks (WLANs) while satisfying the quality of service (QoS) requirements, this paper proposes a novel DCF-based multi-user MAC protocol employing orthogonal frequency division multiple access (OFDMA) scheme. In the proposed protocol, an access point (AP) acts as a master to organize all the stations within the basic service set (BSS) and reserves the radio resource by the conventional distributed coordination function (DCF). In the resource reservation period, the AP performs a flexible access control utilizing the fine-grained resource block and the opportunistic scheduling based on the QoS requirements and the channel condition of each station. With the objective to increase the spectrum efficiency as well as to satisfy the QoS requirements, this paper also proposes a dynamic resource allocation algorithm. Numerical results confirm that the proposed multi-user MAC protocol ensures the QoS requirement with a high probability and enhances the throughput performance.

Distributed transmission for secure wireless links in non-line-of-sight environment by joint transmitter-receiver beamforming

Masaaki Yamanaka, Shinichi Miyamoto, Seiichi Sampei

IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC 724 - 728 2013 [Refereed]

The authors have proposed a distributed-transmission-based secure wireless link creation scheme by providing multiple transmission routes to a destination. In the proposed scheme, the transmitted information is divided into pieces of "shared information" by a secret-sharing method, and the pieces of information are separately transmitted to the destination through different transmission routes with individually controlled antenna directivities. In this paper, we focus on the performance of the proposed scheme in a non-line-of-sight (NLOS) propagation environment and propose a joint receiver beamforming in accordance with the controlled transmitter antenna directivity. The computer simulations clarify that the degree of spatial distribution of the transmission routes is enhanced by the joint beamforming. Therefore, it can improve the secrecy of the transmitted information by the distributed transmission in the wireless space. © 2013 IEEE.

DOI

Novel DCF-based multi-user MAC protocol for centralized radio resource management in OFDMA WLAN systems

Shinichi Miyamoto, Seiichi Sampei, Wenjie Jiang

IEICE Transactions on Communications ( Institute of Electronics, Information and Communication, Engineers, IEICE ) E96-B ( 9 ) 2301 - 2312 2013 [Refereed]

To enhance the throughput while satisfying the quality of service (QoS) requirements of wireless local area networks (WLANs), this paper proposes a distributed coordination function-based (DCF-based) medium access control (MAC) protocol that realizes centralized radio resource management (RRM) for a basic service set. In the proposed protocol, an access point (AP) acts as a master to organize the associated stations and attempts to reserve the radio resource in a conventional DCF-manner. Once the radio resource is successfully reserved, the AP controls the access of each station by an orthogonal frequency division multiple access (OFDMA) scheme. Because the AP assigns radio resources to the stations through the opportunistic two-dimensional scheduling based on the QoS requirements and the channel condition of each station, the transmission opportunities can be granted to the appropriate stations. In order to reduce the signaling overhead caused by centralized RRM, the proposed protocol introduces a station-grouping scheme which groups the associated stations into clusters. Moreover, this paper proposes a heuristic resource allocation algorithm designed for the DCF-based MAC protocol. Numerical results confirm that the proposed protocol enhances the throughput of WLANs while satisfying the QoS requirements with high probability. Copyright © 2013 The Institute of Electronics, Information and Communication Engineers.

DOI

Two-Stage DCF-based Access Scheme for Throughput Enhancement of OFDMA WLAN Systems

Kodai Shimamoto, Shinichi Miyamoto, Seiichi Sampei, Wenjie Jiang

15th International Conference on Wireless Personal Multimedia Communications (WPMC 2012) 584 - 588 2012.09 [Refereed]

A Novel Secure Wireless Communication Using Side Information from Spatially Distributed Nodes in Private Wireless Network

Kodai Shimamoto, Shinichi Miyamoto, Seiichi Sampei, Wenjie Jiang

15th International Conference on Wireless Personal Multimedia Communications (WPMC 2012) 453 - 457 2012.09 [Refereed]

DCF-based MAC Protocol for Centralized Radio Resource Management in OFDMA WLAN Systems

Takuya Mishima, Shinichi Miyamoto, Seiichi Sampei, Wenjie Jiang

9th IEEE Vehicular Technology Society Asia Pacific Wireless Communications Symposium (APWCS 2012) 2012.09 [Refereed]

A Study on a Transmit Antenna Directivity Control of Adaptive Array for Secure Wireless Transmission Based on the Multi-Path Routing

Masaaki Yamanaka, Norihiko Morinaga, Shinichi Miyamoto, Seiichi Sampei

2012 IEEE 75TH VEHICULAR TECHNOLOGY CONFERENCE (VTC SPRING) ( IEEE ) 1 - 5 2012 [Refereed]

This paper proposes an antenna directivity control method of adaptive array antenna for secure wireless transmission by dividing the transmitted information into pieces of divided-information and sending each pieces of information in a spatially distributed manner along multiple paths in a wireless space. Based on the DCMP weight control algorithm, the authors propose an antenna directivity control method not only to steer its main lobe to one targeted path but also to suppress other side lobes to suppress unnecessary signal radiation. Computer simulation confirms that by suppressing the side lobes of the antenna directivity, the transmitted signal power can be concentrated along the targeted path. It is effective to provide multiple transmission routes for signal delivery in the wireless space. Therefore better performance in regard with the secrecy of the transmitted information can be achieved in the wireless space by sending the transmitted information in a spatially distributed manner along the selected paths between the sender and the destination.

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Published Papers - MIYAMOTO Shinichi