TOHOKU ELECTRIC POWER

Displaying 1-31 of 31 results

  • White Papers // Jan 2014

    On Efficient Traffic Distribution for Disaster Area Communication Using Wireless Mesh Networks

    In recent time, a great deal of research effort has been directed toward promptly facilitating post-disaster communication by using Wireless Mesh Networks (WMNs). WMN technology has been considered to be effectively exploited for this purpose as it provides multi-hop communication through an access network comprising wireless Mesh Routers (MRs), which...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Jan 2014

    Data Hiding Scheme for Amplitude Modulation Radio Broadcasting Systems

    In this paper the authors propose a data hiding scheme for Amplitude-Modulation (AM) radio broadcasting systems. The method of digital audio watermarking based on Cochlear Delay (CD) that the authors previously proposed is employed in this scheme to construct a data-hiding scheme in the AM domain. They investigate the feasibility...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Oct 2012

    On Real-Time Data Gathering in Next Generation Satellite-Routed Sensor System (SRSS)

    Recently, satellite-routed sensor systems are expected to be used as early disaster detection systems. The networks efficiently provide data collected from wide areas with small sensor terminals and satellites. In this system, each sensor terminal collects and sends data to monitoring stations on the ground via satellites. Although the future...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Oct 2012

    A Novel P2P VoD Streaming Technique Integrating Localization and Congestion Awareness Strategies

    The concept of the "Future Internet" has evolved amongst researchers recently to relieve the tremendous pressure on the current Internet infrastructure to support the heterogeneous networking technologies, mobile devices, increased population of users, and also the high user requirements for real-time services and applications. Peer-to-Peer (P2P) Video on Demand (VoD)...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Sep 2012

    Never Die Network Based on Cognitive Wireless Network and Satellite System for Large Scale Disaster

    The Great East Japan Earthquake caused many casualties and radiation contamination from the Fukushima nuclear power plant, and many problems still remain in the disaster area. The communication network was severely affected by the earthquake. The network disconnection greatly delayed the rescue work and isolated many residential areas. This lack...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Sep 2012

    Recursive QR Packet Combining for Uplink Single-Carrier Multi-User MIMO HARQ Using Near ML Detection

    QR decomposition based near Maximum Likelihood (ML) block detection significantly improves the transmission performance of uplink Single-Carrier (SC) Multi-User Multiple-Input Multiple-Output (MU-MIMO). Hybrid Automatic Repeat reQuest (HARQ) is an indispensable error control technique for high quality packet data transmission. The achievable diversity gain of HARQ depends on the packet combining...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Sep 2012

    Performance Analysis on FDE Receiver for Single Carrier Transmission

    In this paper, Single Carrier (SC) transmission is considered. The authors focus on SC Frequency Domain Equalization (FDE) receiver and analyze the Signal to Noise Ratio (SNR) of the time domain output signal estimate and then, derive the achievable Bit Error Rate (BER). For the purpose of comparison, they consider...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Sep 2012

    Nash Bargaining Solution Based Subcarrier Allocation for Uplink SC-FDMA Distributed Antenna Network

    The system capacity of Single-Carrier Frequency Division Multiple Access (SC-FDMA) can be increased by allocating subcarriers to users who are in a good channel condition. However, there is a tradeoff between system capacity and fairness among users. Nash Bargaining Solution (NBS) in cooperative game theory can be used to solve...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Sep 2012

    A FAHP Weighting Scheme for System Attributes in Heterogeneous Wireless Networks

    In a heterogeneous wireless network, different wireless access technologies with different operating parameters coexists in an overlay fashion. These wireless networks are deployed in order to provide different type of services to Mobile Stations (MSs) equipped with multiple interfaces, based on the principle of Always Best Connected (ABC) network. In...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Sep 2012

    Joint Overlap FDE & Spectrum Combining for Single-Carrier Transmission Without Cyclic Prefix Insertion

    In the square-root Nyquist transmit-filtered Single-Carrier (SC) transmission, increasing the roll-off factor can reduce the Peak-to-Average Power Ratio (PAPR) of the transmit signal. Furthermore, since the signal bandwidth becomes wider, larger frequency diversity gain can be achieved. In the authors' previous work, they proposed joint Minimum Mean Square Error Frequency-Domain...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Sep 2012

    Uplink Throughput Performance of Single-Carrier MIMO Spatial Multiplexing in Distributed Antenna Network

    Multiple-Input Multiple-Output (MIMO) spatial multiplexing achieves very high spectrum efficient signal transmissions in a Cellular Network (CN). However, this is only possible when the received Signal-to-Interference plus Noise power Ratio (SINR) is high enough. In a conventional CN, multiple antennas are co-located at each Based Station (BS) and hence, the...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Sep 2012

    MIMO-OFDM Transmission Using Complexity Reduced Near ML Detection

    QR decomposition and M-algorithm based near Maximum Likelihood Detection (QRM-MLD) is a promising detection scheme for Multiple-Input Multiple-Output (MIMO) - Orthogonal Frequency Division Multiplexing (OFDM). However, QRM-MLD requires still high computational complexity. Recently, the authors proposed a complexity reduced 2-step QRM-MLD for Single-Carrier (SC) block transmissions. The complexity reduction is...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Sep 2012

    Uplink Capacity of Cellular System Using Frequency Domain Adaptive Antenna Array

    Space Division Multiple Access (SDMA) using Adaptive Antenna Array (AAA) allows multiple users to simultaneously access using the same bandwidth and hence is spectrum efficient. Single-Carrier (SC) transmission has been widely adopted by uplink communication due to its lower Peak-to-Average-Power-Ratio (PAPR) than Multi-Carrier (MC) transmission. However, broadband SC channel is...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Sep 2012

    Joint Transmit/Receive MMSE Filtering for Single-Carrier MIMO Spatial Multiplexing

    Multiple-Input Multiple-Output (MIMO) spatial multiplexing is a powerful technique to increase the transmission data rate. However, if MIMO spatial multiplexing is applied to Single-Carrier (SC) block transmissions, it suffers from the Inter-Symbol Interference (ISI) as well as the Inter-Antenna Interference (IAI). In this paper, the authors propose a joint transmit/receive...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Sep 2012

    Impact of Channel Estimation Error on IBI Cancellation and Circular Property Restoration for Broadband DS-CDMA Combining FDE Without CP Insertion

    In broadband DS-CDMA using Frequency-Domain Equalization (FDE) without Cyclic Prefix (CP) insertion, the transmission performance degrades due to Inter Block Interference (IBI) and circular property loss. In the authors' previous study, they introduced the perfect IBI cancellation and circular property restoration to mitigate the problems arising from IBI and circular...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Jul 2012

    Designing P2P Networks Tolerant to Attacks and Faults Based on Bimodal Degree Distribution

    Recently, in contrast with the centralized networks (e.g., traditional client/server systems), the distributed networks such as Peer-to-Peer (P2P) networks and grid networks have attracted much attention due to their scalability. While the distributed networks have the advantage of allowing the node(s) to join or leave the network easily, the issue...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Jul 2012

    Channel Assignment on Wireless Mesh Network Backbone with Potential Game Approach

    The Wireless Mesh Network (WMN) has already been recognized as a promising technology as broadband access network from both academic and industry points of view. In order to improve its performance, research has been carried on how to increase the number of simultaneous transmissions in the network while avoiding signal...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // May 2012

    Delivery Ratio in Two-Hop Relay MANETs With Limited Message Lifetime and Redundancy

    A lot of work has been done to model and analyze the performances of two-hop relay algorithm and its variants. However, the delivery ratio, especially under limited message lifetime, has been largely neglected in literature, which is not only of significant importance for delay sensitive applications (where a message beyond...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // May 2012

    Assessing Packet Delivery Delay in Multi-Layered Satellite Networks

    Non-Geostationary satellite networks have many advantages to enable ubiquitous wireless environments such as, extensive coverage, disaster-resistance, and efficient power consumption. Furthermore, to use these networks more efficiently, multi-layered satellite networks are a promising approach, due to their ability to achieve increases in network capacity and to detour traffic efficiently, while...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // May 2012

    Capacity Vs. Delivery Delay in MANETs With Power Control and F-Cast Relay

    A lot of works have been dedicated towards understanding the relationship between throughput capacity and packet delay in Mobile Ad hoc NETworks (MANETs). However, nearly all these works either assume a localized transmission range, or report the relationship between throughput capacity and packet delay only in terms of the number...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // May 2012

    Dynamic Topology Update Mechanism in Local Tree-Based Reliable Topology (LTRT) Based MANETs

    Topology control is a powerful solution to reduce power consumption and the number of collisions by minimizing the transmission range of each node by maintaining a certain level of network connectivity. Although many topology control algorithms have been developed for static networks, e.g., sensor and ad hoc networks with less...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Mar 2012

    End-to-End Delay in Mobile Ad Hoc Networks With Generalized Transmission Range and Limited Packet Redundancy

    One of the challenging roadblocks stunting the development and commercialization of Mobile Ad hoc NETworks (MANETs), is the lack of a thorough understanding of the fundamental performance limits in MANETs. Distinguished from available works which mainly focused on deriving order sense scaling laws of the delay performance in MANETs and...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Feb 2012

    Secure Multiplex Coding with Dependent and Non-Uniform Multiple Messages

    The Secure Multiplex Coding (SMC) is a technique to remove rate loss in the coding for wiretap channels and broadcast channels with confidential messages caused by the inclusion of random bits into transmitted signals. SMC replaces the random bits by other meaningful secret messages, and a collection of secret messages...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Feb 2012

    Performance Modeling for Relay Cooperation in Delay Tolerant Networks

    Delay Tolerant Networks (DTNs) rely on the mobility of nodes and sequences of their contacts to compensate for lack of continuous connectivity and thus enable messages to be delivered from end to end in a "Store-carry-forward" way, where multiple relay nodes are usually employed in the message delivery process. In...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Sep 2011

    Throughput Performance of SC-MIMO HARQ Using Training Sequence Aided Near ML Block Detection

    Very high-speed and high-quality packet transmissions in a limited bandwidth can be achieved by the joint use of Multi-Input Multi-Output (MIMO) multiplexing and Hybrid Automatic Repeat reQuest (HARQ). However, if Single-Carrier (SC) transmission is used, the transmission performance significantly degrades due not only to an Inter-Antenna Interference (IAI) but also...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Sep 2011

    Joint MMSE-FDE & Spectrum Combining for Single-Carrier Transmission With Antenna Diversity in the Presence of Timing Offset

    Frequency-Domain Equalization (FDE) based on Minimum Mean Square Error (MMSE) criterion is a powerful equalization technique for the broadband Single-Carrier (SC) transmission. However, the presence of timing offset produces the Inter-Symbol Interference (ISI) and degrades the Bit Error Rate (BER) performance. As the roll-off factor of the transmit filter increases,...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Jun 2011

    Direct/Cooperative AF Relay Switching Using Spectrum Division/Adaptive Subcarrier Allocation for SC-FDMA Uplink

    In this paper, the authors propose a Direct/cooperative Amplify-and-forward Relay (D/AR) switching using a Spectrum Division/Adaptive Subcarrier Allocation (SDASA) for increasing the uplink capacity of Single Carrier-Frequency Division Multiple Access (SC-FDMA). In the D/AR switching, switching between direct communication and cooperative AF relay is done so that the channel capacity...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // May 2011

    Secure Multiplex Coding with a Common Message

    The authors determine the capacity region of the secure multiplex coding with a common message, and evaluate the mutual information and the equivocation rate of a collection of secret messages to the second receiver (eavesdropper), which were not evaluated by Yamamoto et al. The information theoretic security attracts much attention...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Sep 2010

    Single-Carrier Frequency Domain Adaptive Antenna Array for Cellular Systems

    In this paper, a single-carrier Frequency Domain Adaptive Antenna Array (FDAAA) is proposed for the uplink transmission in cellular systems. The FDAAA algorithm will deal with co-channel interference and exploit the frequency selectivity of the channel fading jointly by using adaptive antenna array in the frequency domain. The receiver of...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Sep 2010

    Lattice Reduction-Aided Uplink Multi-User MIMO in OFDM Cellular Systems

    In cellular systems, multi-user Multi-Input Multi-Output (MIMO) multiplexing can increase the number of simultaneous users per cell; however Co-Channel Interference (CCI) from other cells limits the number of users/cell (defined as the cellular capacity). The well-known Zero-Forcing Detection (ZFD) and Minimum Mean Square Error Detection (MMSED) are computationally efficient detection...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // May 2008

    High-Performance Concurrent Error Detection Scheme for AES Hardware

    In this paper, the authors propose an efficient concurrent error detection scheme for hardware implementation of the block cipher AES. The proposed scheme does not require an additional arithmetic unit, but simply divides the round function block into two sub-blocks and uses the sub-blocks alternately for encryption (or decryption) and...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Sep 2010

    Single-Carrier Frequency Domain Adaptive Antenna Array for Cellular Systems

    In this paper, a single-carrier Frequency Domain Adaptive Antenna Array (FDAAA) is proposed for the uplink transmission in cellular systems. The FDAAA algorithm will deal with co-channel interference and exploit the frequency selectivity of the channel fading jointly by using adaptive antenna array in the frequency domain. The receiver of...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Sep 2010

    Lattice Reduction-Aided Uplink Multi-User MIMO in OFDM Cellular Systems

    In cellular systems, multi-user Multi-Input Multi-Output (MIMO) multiplexing can increase the number of simultaneous users per cell; however Co-Channel Interference (CCI) from other cells limits the number of users/cell (defined as the cellular capacity). The well-known Zero-Forcing Detection (ZFD) and Minimum Mean Square Error Detection (MMSED) are computationally efficient detection...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Sep 2012

    Performance Analysis on FDE Receiver for Single Carrier Transmission

    In this paper, Single Carrier (SC) transmission is considered. The authors focus on SC Frequency Domain Equalization (FDE) receiver and analyze the Signal to Noise Ratio (SNR) of the time domain output signal estimate and then, derive the achievable Bit Error Rate (BER). For the purpose of comparison, they consider...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Sep 2012

    Nash Bargaining Solution Based Subcarrier Allocation for Uplink SC-FDMA Distributed Antenna Network

    The system capacity of Single-Carrier Frequency Division Multiple Access (SC-FDMA) can be increased by allocating subcarriers to users who are in a good channel condition. However, there is a tradeoff between system capacity and fairness among users. Nash Bargaining Solution (NBS) in cooperative game theory can be used to solve...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Jun 2011

    Direct/Cooperative AF Relay Switching Using Spectrum Division/Adaptive Subcarrier Allocation for SC-FDMA Uplink

    In this paper, the authors propose a Direct/cooperative Amplify-and-forward Relay (D/AR) switching using a Spectrum Division/Adaptive Subcarrier Allocation (SDASA) for increasing the uplink capacity of Single Carrier-Frequency Division Multiple Access (SC-FDMA). In the D/AR switching, switching between direct communication and cooperative AF relay is done so that the channel capacity...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Sep 2011

    Throughput Performance of SC-MIMO HARQ Using Training Sequence Aided Near ML Block Detection

    Very high-speed and high-quality packet transmissions in a limited bandwidth can be achieved by the joint use of Multi-Input Multi-Output (MIMO) multiplexing and Hybrid Automatic Repeat reQuest (HARQ). However, if Single-Carrier (SC) transmission is used, the transmission performance significantly degrades due not only to an Inter-Antenna Interference (IAI) but also...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Sep 2011

    Joint MMSE-FDE & Spectrum Combining for Single-Carrier Transmission With Antenna Diversity in the Presence of Timing Offset

    Frequency-Domain Equalization (FDE) based on Minimum Mean Square Error (MMSE) criterion is a powerful equalization technique for the broadband Single-Carrier (SC) transmission. However, the presence of timing offset produces the Inter-Symbol Interference (ISI) and degrades the Bit Error Rate (BER) performance. As the roll-off factor of the transmit filter increases,...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Sep 2012

    A FAHP Weighting Scheme for System Attributes in Heterogeneous Wireless Networks

    In a heterogeneous wireless network, different wireless access technologies with different operating parameters coexists in an overlay fashion. These wireless networks are deployed in order to provide different type of services to Mobile Stations (MSs) equipped with multiple interfaces, based on the principle of Always Best Connected (ABC) network. In...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Sep 2012

    Joint Overlap FDE & Spectrum Combining for Single-Carrier Transmission Without Cyclic Prefix Insertion

    In the square-root Nyquist transmit-filtered Single-Carrier (SC) transmission, increasing the roll-off factor can reduce the Peak-to-Average Power Ratio (PAPR) of the transmit signal. Furthermore, since the signal bandwidth becomes wider, larger frequency diversity gain can be achieved. In the authors' previous work, they proposed joint Minimum Mean Square Error Frequency-Domain...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Sep 2012

    Uplink Throughput Performance of Single-Carrier MIMO Spatial Multiplexing in Distributed Antenna Network

    Multiple-Input Multiple-Output (MIMO) spatial multiplexing achieves very high spectrum efficient signal transmissions in a Cellular Network (CN). However, this is only possible when the received Signal-to-Interference plus Noise power Ratio (SINR) is high enough. In a conventional CN, multiple antennas are co-located at each Based Station (BS) and hence, the...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Sep 2012

    MIMO-OFDM Transmission Using Complexity Reduced Near ML Detection

    QR decomposition and M-algorithm based near Maximum Likelihood Detection (QRM-MLD) is a promising detection scheme for Multiple-Input Multiple-Output (MIMO) - Orthogonal Frequency Division Multiplexing (OFDM). However, QRM-MLD requires still high computational complexity. Recently, the authors proposed a complexity reduced 2-step QRM-MLD for Single-Carrier (SC) block transmissions. The complexity reduction is...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Sep 2012

    Uplink Capacity of Cellular System Using Frequency Domain Adaptive Antenna Array

    Space Division Multiple Access (SDMA) using Adaptive Antenna Array (AAA) allows multiple users to simultaneously access using the same bandwidth and hence is spectrum efficient. Single-Carrier (SC) transmission has been widely adopted by uplink communication due to its lower Peak-to-Average-Power-Ratio (PAPR) than Multi-Carrier (MC) transmission. However, broadband SC channel is...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Sep 2012

    Joint Transmit/Receive MMSE Filtering for Single-Carrier MIMO Spatial Multiplexing

    Multiple-Input Multiple-Output (MIMO) spatial multiplexing is a powerful technique to increase the transmission data rate. However, if MIMO spatial multiplexing is applied to Single-Carrier (SC) block transmissions, it suffers from the Inter-Symbol Interference (ISI) as well as the Inter-Antenna Interference (IAI). In this paper, the authors propose a joint transmit/receive...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Sep 2012

    Impact of Channel Estimation Error on IBI Cancellation and Circular Property Restoration for Broadband DS-CDMA Combining FDE Without CP Insertion

    In broadband DS-CDMA using Frequency-Domain Equalization (FDE) without Cyclic Prefix (CP) insertion, the transmission performance degrades due to Inter Block Interference (IBI) and circular property loss. In the authors' previous study, they introduced the perfect IBI cancellation and circular property restoration to mitigate the problems arising from IBI and circular...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Sep 2012

    Recursive QR Packet Combining for Uplink Single-Carrier Multi-User MIMO HARQ Using Near ML Detection

    QR decomposition based near Maximum Likelihood (ML) block detection significantly improves the transmission performance of uplink Single-Carrier (SC) Multi-User Multiple-Input Multiple-Output (MU-MIMO). Hybrid Automatic Repeat reQuest (HARQ) is an indispensable error control technique for high quality packet data transmission. The achievable diversity gain of HARQ depends on the packet combining...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // May 2012

    Capacity Vs. Delivery Delay in MANETs With Power Control and F-Cast Relay

    A lot of works have been dedicated towards understanding the relationship between throughput capacity and packet delay in Mobile Ad hoc NETworks (MANETs). However, nearly all these works either assume a localized transmission range, or report the relationship between throughput capacity and packet delay only in terms of the number...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // May 2012

    Dynamic Topology Update Mechanism in Local Tree-Based Reliable Topology (LTRT) Based MANETs

    Topology control is a powerful solution to reduce power consumption and the number of collisions by minimizing the transmission range of each node by maintaining a certain level of network connectivity. Although many topology control algorithms have been developed for static networks, e.g., sensor and ad hoc networks with less...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Sep 2012

    Never Die Network Based on Cognitive Wireless Network and Satellite System for Large Scale Disaster

    The Great East Japan Earthquake caused many casualties and radiation contamination from the Fukushima nuclear power plant, and many problems still remain in the disaster area. The communication network was severely affected by the earthquake. The network disconnection greatly delayed the rescue work and isolated many residential areas. This lack...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Jul 2012

    Channel Assignment on Wireless Mesh Network Backbone with Potential Game Approach

    The Wireless Mesh Network (WMN) has already been recognized as a promising technology as broadband access network from both academic and industry points of view. In order to improve its performance, research has been carried on how to increase the number of simultaneous transmissions in the network while avoiding signal...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // May 2012

    Delivery Ratio in Two-Hop Relay MANETs With Limited Message Lifetime and Redundancy

    A lot of work has been done to model and analyze the performances of two-hop relay algorithm and its variants. However, the delivery ratio, especially under limited message lifetime, has been largely neglected in literature, which is not only of significant importance for delay sensitive applications (where a message beyond...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // May 2011

    Secure Multiplex Coding with a Common Message

    The authors determine the capacity region of the secure multiplex coding with a common message, and evaluate the mutual information and the equivocation rate of a collection of secret messages to the second receiver (eavesdropper), which were not evaluated by Yamamoto et al. The information theoretic security attracts much attention...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Mar 2012

    End-to-End Delay in Mobile Ad Hoc Networks With Generalized Transmission Range and Limited Packet Redundancy

    One of the challenging roadblocks stunting the development and commercialization of Mobile Ad hoc NETworks (MANETs), is the lack of a thorough understanding of the fundamental performance limits in MANETs. Distinguished from available works which mainly focused on deriving order sense scaling laws of the delay performance in MANETs and...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Feb 2012

    Secure Multiplex Coding with Dependent and Non-Uniform Multiple Messages

    The Secure Multiplex Coding (SMC) is a technique to remove rate loss in the coding for wiretap channels and broadcast channels with confidential messages caused by the inclusion of random bits into transmitted signals. SMC replaces the random bits by other meaningful secret messages, and a collection of secret messages...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // May 2012

    Assessing Packet Delivery Delay in Multi-Layered Satellite Networks

    Non-Geostationary satellite networks have many advantages to enable ubiquitous wireless environments such as, extensive coverage, disaster-resistance, and efficient power consumption. Furthermore, to use these networks more efficiently, multi-layered satellite networks are a promising approach, due to their ability to achieve increases in network capacity and to detour traffic efficiently, while...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Oct 2012

    On Real-Time Data Gathering in Next Generation Satellite-Routed Sensor System (SRSS)

    Recently, satellite-routed sensor systems are expected to be used as early disaster detection systems. The networks efficiently provide data collected from wide areas with small sensor terminals and satellites. In this system, each sensor terminal collects and sends data to monitoring stations on the ground via satellites. Although the future...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Feb 2012

    Performance Modeling for Relay Cooperation in Delay Tolerant Networks

    Delay Tolerant Networks (DTNs) rely on the mobility of nodes and sequences of their contacts to compensate for lack of continuous connectivity and thus enable messages to be delivered from end to end in a "Store-carry-forward" way, where multiple relay nodes are usually employed in the message delivery process. In...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Oct 2012

    A Novel P2P VoD Streaming Technique Integrating Localization and Congestion Awareness Strategies

    The concept of the "Future Internet" has evolved amongst researchers recently to relieve the tremendous pressure on the current Internet infrastructure to support the heterogeneous networking technologies, mobile devices, increased population of users, and also the high user requirements for real-time services and applications. Peer-to-Peer (P2P) Video on Demand (VoD)...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Jul 2012

    Designing P2P Networks Tolerant to Attacks and Faults Based on Bimodal Degree Distribution

    Recently, in contrast with the centralized networks (e.g., traditional client/server systems), the distributed networks such as Peer-to-Peer (P2P) networks and grid networks have attracted much attention due to their scalability. While the distributed networks have the advantage of allowing the node(s) to join or leave the network easily, the issue...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Jan 2014

    On Efficient Traffic Distribution for Disaster Area Communication Using Wireless Mesh Networks

    In recent time, a great deal of research effort has been directed toward promptly facilitating post-disaster communication by using Wireless Mesh Networks (WMNs). WMN technology has been considered to be effectively exploited for this purpose as it provides multi-hop communication through an access network comprising wireless Mesh Routers (MRs), which...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // May 2008

    High-Performance Concurrent Error Detection Scheme for AES Hardware

    In this paper, the authors propose an efficient concurrent error detection scheme for hardware implementation of the block cipher AES. The proposed scheme does not require an additional arithmetic unit, but simply divides the round function block into two sub-blocks and uses the sub-blocks alternately for encryption (or decryption) and...

    Provided By TOHOKU ELECTRIC POWER

  • White Papers // Jan 2014

    Data Hiding Scheme for Amplitude Modulation Radio Broadcasting Systems

    In this paper the authors propose a data hiding scheme for Amplitude-Modulation (AM) radio broadcasting systems. The method of digital audio watermarking based on Cochlear Delay (CD) that the authors previously proposed is employed in this scheme to construct a data-hiding scheme in the AM domain. They investigate the feasibility...

    Provided By TOHOKU ELECTRIC POWER