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Tokyo Institute of Technology
(39 results)-
White Papers
Autonomous Real-Time Navigation for Service Level Agreement in Distributed Information Service System
January 1, 2011, 12:00am PST
In today's aggressive and competitive marketplace, there is substantial need for corporations to incorporate Service Level Agreement (SLA) in their enterprise; and keep user differentiation with...
Provided by Tokyo Institute of Technology
-
White Papers
Characterization of the Relations Between Information-Theoretic Non-Malleability, Secrecy, and Authenticity
February 1, 2011, 12:00am PST
Roughly speaking, an encryption scheme is said to be non-malleable, if no adversary can modify a ciphertext so that the resulting message is meaningfully related to the original message. The...
Provided by Tokyo Institute of Technology
-
White Papers
Security of Encryption Schemes in Weakened Random Oracle Models
March 5, 2010, 12:00am PST
Liskov proposed several weakened versions of the random oracle model, called Weakened Random Oracle Models (WROMs), to capture the vulnerability of ideal compression functions, which are expected...
Provided by Tokyo Institute of Technology
-
White Papers
Statistical Mechanical Analysis of the Linear Vector Channel in Digital Communication
November 6, 2007, 12:00am PST
A statistical mechanical framework to analyze linear vector channel models in digital wireless communication is proposed for a large system. The framework is a generalization of that proposed for...
Provided by Tokyo Institute of Technology
-
White Papers
Strongly Secure Privacy Amplification Cannot Be Obtained by Encoder of Slepian-Wolf Code
March 8, 2011, 12:00am PST
Privacy amplification is a technique to distill a secret key from a random variable by a function so that the distilled key and eavesdropper's random variable are statistically independent. There...
Provided by Tokyo Institute of Technology
-
White Papers
Problems in Application of LDPC Codes to Information Reconciliation in Quantum Key Distribution Protocols
September 13, 2009, 12:00am PDT
The information reconciliation in a quantum key distribution protocol can be studied separately from other steps in the protocol. The problem of information reconciliation can be reduced to that...
Provided by Tokyo Institute of Technology
-
White Papers
Statistical Mechanical Analysis of the Kronecker Channel Model for MIMO Wireless Communication
September 18, 2009, 12:00am PDT
The Kronecker channel model of wireless communication is analyzed using statistical mechanics methods. In the model, spatial proximities among transmission/reception antennas are taken into...
Provided by Tokyo Institute of Technology
-
White Papers
Elastic Stream Computing With Clouds
April 14, 2011, 12:00am PDT
Stream computing, also known as data stream processing, has emerged as a new processing paradigm that processes incoming data streams from tremendous numbers of sensors in a real-time fashion....
Provided by Tokyo Institute of Technology
-
White Papers
Performance Evaluation of Cyclic Detector in Cognitive Radio
November 18, 2007, 12:00am PST
Recently, the Notice of Proposed Rule Making (NPRM) of the Federal Communications Commission (FCC) in United States (US) has released the spectrum allocated to the broadcast TeleVision (TV) for...
Provided by Tokyo Institute of Technology
-
White Papers
Statistical Characterization of 4.5 GHz Narrowband On-Body Propagation Channel
February 5, 2010, 12:00am PST
This paper presents the characterization of on-body propagation channel with specific activity of a body analyzing measurement results of a male subject in a radio anechoic chamber. To capture the...
Provided by Tokyo Institute of Technology
-
White Papers
On the Channel Sounding Technique Using MIMO Software Radio Architecture
February 5, 2010, 12:00am PST
Advantages and issues of the channel sounding technique using MIMO software radio architecture are discussed. By end of February, the first prototype consisting one transmitter unit and one...
Provided by Tokyo Institute of Technology
-
White Papers
Directional Analysis of the Radio Wave Propagation Through Foliage
February 5, 2010, 12:00am PST
This paper is a preliminary report on the study of the foliage influence on the radio wave propagation in cellular scenarios. The purpose is to evaluate the dispersion and attenuation caused by...
Provided by Tokyo Institute of Technology
-
White Papers
Performance Enhancement of Cyclostationarity Detector by Utilizing Multiple Cyclic Frequencies of OFDM Signals
January 30, 2010, 12:00am PST
Spectrum sensing is a key technical challenge for the Cognitive Radio (CR) technology which allows it to access the spectrum of the licensed systems without causing interference to them. It is...
Provided by Tokyo Institute of Technology
-
White Papers
Multipath Cluster Polarization Characteristics of a Small Urban MIMO Macrocell
February 18, 2009, 12:00am PST
This paper presents clusterwise polarization characteristics taken from an estimated MIMO channel of a small urban macrocell at 4.5 GHz. Polarization path gain, cross-polarization ratio, and...
Provided by Tokyo Institute of Technology
-
White Papers
Performance Evaluation of Threshold-Based UWB Ranging Methods - Leading Edge Vs. Search Back-
January 1, 2010, 12:00am PST
Accurate ranging is one of the most promising applications of ultra wideband radio in sensor networks. Amongst variety of ranging methods, threshold-based ranging is a primitive, but robust...
Provided by Tokyo Institute of Technology
-
White Papers
Evaluation of Waveform Distortion Due to Antennas on Free Space Transmission in Ultra Wideband Impulse Radio
January 2, 2010, 12:00am PST
The waveform of an Ultra WideBand Impulse Radio (UWB-IR) system can be extremely distorted through a channel even for free-space transmission because of antenna dispersion. Therefore, the...
Provided by Tokyo Institute of Technology
-
White Papers
Experimental Study of Frequency Characteristics and Spatial Characteristics of Propagation Through Foliage
January 23, 2009, 12:00am PST
Coverage prediction of wireless communication systems requires a precise knowledge of how the environments surrounding the base station and mobile station influences radio propagation. In...
Provided by Tokyo Institute of Technology
-
White Papers
Observation of Physical Mechanism of On-Body Channel Fluctuation
January 2, 2010, 12:00am PST
In this paper, the mechanisms of on-body channel fading are physically observed in two measurement procedures. First is the far-field on-body antenna patterns aimed to investigate the effect of...
Provided by Tokyo Institute of Technology
-
White Papers
MIMO Channel Capacity Measurement in the Presence of Spatial Clusters Using a Fading Emulator
August 3, 2009, 12:00am PDT
This paper presents a Radio Frequency (RF) controlled spatial fading emulator for the evaluation of a handset MIMO antenna. The RF-controlled fading emulator can control RF signals directly in the...
Provided by Tokyo Institute of Technology
-
White Papers
Efficient Multi-Channel Wideband Spectrum Sensing Technique Using Filter Bank
August 4, 2009, 12:00am PDT
As a growing interest in the cognitive radio technology has been taken based on the idea of opportunistic spectrum use, the spectrum sensing technique for dynamic channel environment is more and...
Provided by Tokyo Institute of Technology
-
White Papers
Cluster Polarization Behavior of a MIMO System: Measurement, Modeling and Statistical Validation of the Correlation of Its Channel Parameters
August 14, 2009, 12:00am PDT
This paper presents clusterwise polarization characteristics based on an estimated MIMO channel of a small urban macrocell at 4.5 GHz. Polarization path gain, cross-polarization ratio, and...
Provided by Tokyo Institute of Technology
-
White Papers
Optimum Threshold for Ranging Based on ToA Estimation Error Analysis
August 6, 2009, 12:00am PDT
Several schemes have been reported for Time-of-Arrival (ToA) based ranging. Among these schemes, threshold-based ToA estimators is attractive because complexity and computational constraints are...
Provided by Tokyo Institute of Technology
-
White Papers
Throughput Measurement of MIMO Array on WLAN IEEE 802.11n System Using a RF-Controlled Spatial Fading Emulator
September 30, 2009, 12:00am PDT
This paper presents measured throughput characteristics of a 2-by-2 MIMO radio communication using a RF-controlled spatial fading emulator on a Wireless Local Area Network (WLAN) system based on...
Provided by Tokyo Institute of Technology
-
White Papers
Total Radiated Power Measurement for Antenna Integrated Radios Using a Spheroidal Coupler
September 30, 2009, 12:00am PDT
The authors propose a novel method for measuring the Total Radiated Power (TRP) of small radio terminals, such as mobile phones, active RFID tags, and UWB devices, using a spheroidal cavity...
Provided by Tokyo Institute of Technology
-
White Papers
Conservative Protection Criteria for TV Broadcasting Services From IEEE 802.22 WRAN
January 5, 2009, 12:00am PST
IEEE 802.22 Wireless Regional Area Network (IEEE 802.22 WRAN) is considered for operating in the TeleVision (TV) bands without causing harmful interference to the primary users i.e. TV users. To...
Provided by Tokyo Institute of Technology
-
White Papers
Evaluation of Relay Transmission in Outdoor-to-Indoor Propagation Channels
August 16, 2008, 12:00am PDT
Deployment of future mobile communication systems in higher frequency bands is always important to consider, given the scarcity of available frequency bands at lower frequencies below 5 GHz. It is...
Provided by Tokyo Institute of Technology
-
White Papers
Static Propagation and Channel Models in Body Area
October 8, 2008, 12:00am PDT
Recently, Body Area Networks (BANs) have been considered as a new short range wireless application, especially for the medical and healthcare as well as the entertainment. The body area channel is...
Provided by Tokyo Institute of Technology
-
White Papers
SNR Gain Analysis of Ultra Wideband Template Receiver for Wireless Personal Area Networks
September 28, 2008, 12:00am PDT
In this paper, the authors evaluated the Signal to Noise Ratio (SNR) gain of Ultra WideBand (UWB) receivers performance for wireless personal area network. The optimum and isotropic template...
Provided by Tokyo Institute of Technology
-
White Papers
The Waveform Distortion Due to Antennas on Transmission Loss of Ultra Wideband Impulse Radio
September 28, 2008, 12:00am PDT
In this paper, the authors evaluated the transmission gain of ultra wideband radio by using the Friis' transmission formula. However, it is not directly applicable to Ultra WideBand Impulse Radio...
Provided by Tokyo Institute of Technology
-
White Papers
Measurement Techniques of Transmissions From Ultra Wideband Devices
December 2, 2007, 12:00am PST
This paper reports the measurement techniques of transmissions from Ultra WideBand (UWB) devices summarized in ITU-R Task Group (TG) 1/8 to study the compatibility between Ultra-WideBand (UWB)...
Provided by Tokyo Institute of Technology
-
White Papers
Experimental Study and Analysis of Antenna Effects for UWB Radio Transmission
December 2, 2007, 12:00am PST
This paper present the transmission gain of UWB system based on the extended Friis' transmission formula. The template waveform is considered at the receiver side to maximize the SNR for...
Provided by Tokyo Institute of Technology
-
White Papers
BER Performance of UWB Communications With Matched Filter and Correlation Receivers
December 2, 2007, 12:00am PST
In this paper, the Bit Error Rate (BER) performance of Ultra WideBand (UWB) communications with matched filter and correlation receivers are analyzed. The rectangular passband, modulated...
Provided by Tokyo Institute of Technology
-
White Papers
Modeling of Indoor UWB Channel by Using Finite Difference Time Domain Method
December 2, 2007, 12:00am PST
In this paper, a Two-Dimensional (2-D) Transverse Magnetic (TM) mode Finite Difference Time Domain (FDTD) method is used to simulate the indoor radio wave propagation and model the indoor Ultra...
Provided by Tokyo Institute of Technology
-
White Papers
Power Spectral Density Analysis of Ultra Wideband Signal Using Pulse Shape Modulation
December 2, 2007, 12:00am PST
Almost all communication systems employ the sinusoidal signal as a transmitted waveform. Its information is mapped via the modulation. The result is that the Power Spectral Density (PSD) of this...
Provided by Tokyo Institute of Technology
-
White Papers
Azimuth-Power-Spectrum Prediction by Site-Specific Stochastic Channel Modeling in a Microcell Line-of-Sight Scenario
September 12, 2007, 12:00am PDT
A channel model for Line-of-Sight (LoS) microcell in dense urban areas is proposed. It is a kind of Geometry-based Stochastic Channel Model (GSCM) for which the Scattering-PowerDistribution (SPD)...
Provided by Tokyo Institute of Technology
-
White Papers
Analysis and Modeling of Dsrc Service Over-Reach Inside an Arched Transportation Tunnel
June 27, 2007, 12:00am PDT
The prediction of received power in the adjacent zone of a Dedicated Short Range Communications (DSRC) system operating inside an arched transportation tunnel is discussed. Wideband directional...
Provided by Tokyo Institute of Technology
-
White Papers
Ultra Wideband Impulse Radio Transmission Waveform Analysis With Human Body for Wireless Body Area Networks
July 15, 2008, 12:00am PDT
Ultra WideBand-Impulse Radio (UWB-IR) technology is an ideal candidate for wireless networks that can be utilized for short-range, high-speed, low power, and low cost indoor applications. This...
Provided by Tokyo Institute of Technology
-
White Papers
Channel Capacity of a Handset MIMO Antenna Influenced by the Effects of 3D Angular Spectrum, Polarization, and Operator
January 26, 2009, 12:00am PST
So far, effects of MIMO on the enhancement of channel capacity have been investigated principally in the i.i.d. (independent and identically distributed) channel. However, for a handset MIMO, some...
Provided by Tokyo Institute of Technology
-
White Papers
Real-Time Propagation Measurement System and Scattering Object Identification by 3D Visualization by Using VRML for ETC System
September 27, 2008, 12:00am PDT
In the early deployment of Electric Toll Collecting (ETC) system, multipath interference has caused the malfunction of the system. Therefore, radio absorbers are installed in the toll gate to...
Provided by Tokyo Institute of Technology
-
White Papers
Real-Time Propagation Measurement System and Scattering Object Identification by 3D Visualization by Using VRML for ETC System
September 27, 2008, 12:00am PDT
In the early deployment of Electric Toll Collecting (ETC) system, multipath interference has caused the malfunction of the system. Therefore, radio absorbers are installed in the toll gate to...
Provided by Tokyo Institute of Technology
-
White Papers
Channel Capacity of a Handset MIMO Antenna Influenced by the Effects of 3D Angular Spectrum, Polarization, and Operator
January 26, 2009, 12:00am PST
So far, effects of MIMO on the enhancement of channel capacity have been investigated principally in the i.i.d. (independent and identically distributed) channel. However, for a handset MIMO, some...
Provided by Tokyo Institute of Technology
-
White Papers
Ultra Wideband Impulse Radio Transmission Waveform Analysis With Human Body for Wireless Body Area Networks
July 15, 2008, 12:00am PDT
Ultra WideBand-Impulse Radio (UWB-IR) technology is an ideal candidate for wireless networks that can be utilized for short-range, high-speed, low power, and low cost indoor applications. This...
Provided by Tokyo Institute of Technology
-
White Papers
Analysis and Modeling of Dsrc Service Over-Reach Inside an Arched Transportation Tunnel
June 27, 2007, 12:00am PDT
The prediction of received power in the adjacent zone of a Dedicated Short Range Communications (DSRC) system operating inside an arched transportation tunnel is discussed. Wideband directional...
Provided by Tokyo Institute of Technology
-
White Papers
Azimuth-Power-Spectrum Prediction by Site-Specific Stochastic Channel Modeling in a Microcell Line-of-Sight Scenario
September 12, 2007, 12:00am PDT
A channel model for Line-of-Sight (LoS) microcell in dense urban areas is proposed. It is a kind of Geometry-based Stochastic Channel Model (GSCM) for which the Scattering-PowerDistribution (SPD)...
Provided by Tokyo Institute of Technology
-
White Papers
Power Spectral Density Analysis of Ultra Wideband Signal Using Pulse Shape Modulation
December 2, 2007, 12:00am PST
Almost all communication systems employ the sinusoidal signal as a transmitted waveform. Its information is mapped via the modulation. The result is that the Power Spectral Density (PSD) of this...
Provided by Tokyo Institute of Technology
-
White Papers
Modeling of Indoor UWB Channel by Using Finite Difference Time Domain Method
December 2, 2007, 12:00am PST
In this paper, a Two-Dimensional (2-D) Transverse Magnetic (TM) mode Finite Difference Time Domain (FDTD) method is used to simulate the indoor radio wave propagation and model the indoor Ultra...
Provided by Tokyo Institute of Technology
-
White Papers
BER Performance of UWB Communications With Matched Filter and Correlation Receivers
December 2, 2007, 12:00am PST
In this paper, the Bit Error Rate (BER) performance of Ultra WideBand (UWB) communications with matched filter and correlation receivers are analyzed. The rectangular passband, modulated...
Provided by Tokyo Institute of Technology
-
White Papers
Experimental Study and Analysis of Antenna Effects for UWB Radio Transmission
December 2, 2007, 12:00am PST
This paper present the transmission gain of UWB system based on the extended Friis' transmission formula. The template waveform is considered at the receiver side to maximize the SNR for...
Provided by Tokyo Institute of Technology
-
White Papers
Measurement Techniques of Transmissions From Ultra Wideband Devices
December 2, 2007, 12:00am PST
This paper reports the measurement techniques of transmissions from Ultra WideBand (UWB) devices summarized in ITU-R Task Group (TG) 1/8 to study the compatibility between Ultra-WideBand (UWB)...
Provided by Tokyo Institute of Technology
-
White Papers
The Waveform Distortion Due to Antennas on Transmission Loss of Ultra Wideband Impulse Radio
September 28, 2008, 12:00am PDT
In this paper, the authors evaluated the transmission gain of ultra wideband radio by using the Friis' transmission formula. However, it is not directly applicable to Ultra WideBand Impulse Radio...
Provided by Tokyo Institute of Technology
-
White Papers
SNR Gain Analysis of Ultra Wideband Template Receiver for Wireless Personal Area Networks
September 28, 2008, 12:00am PDT
In this paper, the authors evaluated the Signal to Noise Ratio (SNR) gain of Ultra WideBand (UWB) receivers performance for wireless personal area network. The optimum and isotropic template...
Provided by Tokyo Institute of Technology
-
White Papers
Static Propagation and Channel Models in Body Area
October 8, 2008, 12:00am PDT
Recently, Body Area Networks (BANs) have been considered as a new short range wireless application, especially for the medical and healthcare as well as the entertainment. The body area channel is...
Provided by Tokyo Institute of Technology
-
White Papers
Evaluation of Relay Transmission in Outdoor-to-Indoor Propagation Channels
August 16, 2008, 12:00am PDT
Deployment of future mobile communication systems in higher frequency bands is always important to consider, given the scarcity of available frequency bands at lower frequencies below 5 GHz. It is...
Provided by Tokyo Institute of Technology
-
White Papers
Conservative Protection Criteria for TV Broadcasting Services From IEEE 802.22 WRAN
January 5, 2009, 12:00am PST
IEEE 802.22 Wireless Regional Area Network (IEEE 802.22 WRAN) is considered for operating in the TeleVision (TV) bands without causing harmful interference to the primary users i.e. TV users. To...
Provided by Tokyo Institute of Technology
-
White Papers
Total Radiated Power Measurement for Antenna Integrated Radios Using a Spheroidal Coupler
September 30, 2009, 12:00am PDT
The authors propose a novel method for measuring the Total Radiated Power (TRP) of small radio terminals, such as mobile phones, active RFID tags, and UWB devices, using a spheroidal cavity...
Provided by Tokyo Institute of Technology
-
White Papers
Throughput Measurement of MIMO Array on WLAN IEEE 802.11n System Using a RF-Controlled Spatial Fading Emulator
September 30, 2009, 12:00am PDT
This paper presents measured throughput characteristics of a 2-by-2 MIMO radio communication using a RF-controlled spatial fading emulator on a Wireless Local Area Network (WLAN) system based on...
Provided by Tokyo Institute of Technology
-
White Papers
Optimum Threshold for Ranging Based on ToA Estimation Error Analysis
August 6, 2009, 12:00am PDT
Several schemes have been reported for Time-of-Arrival (ToA) based ranging. Among these schemes, threshold-based ToA estimators is attractive because complexity and computational constraints are...
Provided by Tokyo Institute of Technology
-
White Papers
Cluster Polarization Behavior of a MIMO System: Measurement, Modeling and Statistical Validation of the Correlation of Its Channel Parameters
August 14, 2009, 12:00am PDT
This paper presents clusterwise polarization characteristics based on an estimated MIMO channel of a small urban macrocell at 4.5 GHz. Polarization path gain, cross-polarization ratio, and...
Provided by Tokyo Institute of Technology
-
White Papers
Efficient Multi-Channel Wideband Spectrum Sensing Technique Using Filter Bank
August 4, 2009, 12:00am PDT
As a growing interest in the cognitive radio technology has been taken based on the idea of opportunistic spectrum use, the spectrum sensing technique for dynamic channel environment is more and...
Provided by Tokyo Institute of Technology
-
White Papers
MIMO Channel Capacity Measurement in the Presence of Spatial Clusters Using a Fading Emulator
August 3, 2009, 12:00am PDT
This paper presents a Radio Frequency (RF) controlled spatial fading emulator for the evaluation of a handset MIMO antenna. The RF-controlled fading emulator can control RF signals directly in the...
Provided by Tokyo Institute of Technology
-
White Papers
Observation of Physical Mechanism of On-Body Channel Fluctuation
January 2, 2010, 12:00am PST
In this paper, the mechanisms of on-body channel fading are physically observed in two measurement procedures. First is the far-field on-body antenna patterns aimed to investigate the effect of...
Provided by Tokyo Institute of Technology
-
White Papers
Experimental Study of Frequency Characteristics and Spatial Characteristics of Propagation Through Foliage
January 23, 2009, 12:00am PST
Coverage prediction of wireless communication systems requires a precise knowledge of how the environments surrounding the base station and mobile station influences radio propagation. In...
Provided by Tokyo Institute of Technology
-
White Papers
Evaluation of Waveform Distortion Due to Antennas on Free Space Transmission in Ultra Wideband Impulse Radio
January 2, 2010, 12:00am PST
The waveform of an Ultra WideBand Impulse Radio (UWB-IR) system can be extremely distorted through a channel even for free-space transmission because of antenna dispersion. Therefore, the...
Provided by Tokyo Institute of Technology
-
White Papers
Performance Evaluation of Threshold-Based UWB Ranging Methods - Leading Edge Vs. Search Back-
January 1, 2010, 12:00am PST
Accurate ranging is one of the most promising applications of ultra wideband radio in sensor networks. Amongst variety of ranging methods, threshold-based ranging is a primitive, but robust...
Provided by Tokyo Institute of Technology
-
White Papers
Multipath Cluster Polarization Characteristics of a Small Urban MIMO Macrocell
February 18, 2009, 12:00am PST
This paper presents clusterwise polarization characteristics taken from an estimated MIMO channel of a small urban macrocell at 4.5 GHz. Polarization path gain, cross-polarization ratio, and...
Provided by Tokyo Institute of Technology
-
White Papers
Performance Enhancement of Cyclostationarity Detector by Utilizing Multiple Cyclic Frequencies of OFDM Signals
January 30, 2010, 12:00am PST
Spectrum sensing is a key technical challenge for the Cognitive Radio (CR) technology which allows it to access the spectrum of the licensed systems without causing interference to them. It is...
Provided by Tokyo Institute of Technology
-
White Papers
Directional Analysis of the Radio Wave Propagation Through Foliage
February 5, 2010, 12:00am PST
This paper is a preliminary report on the study of the foliage influence on the radio wave propagation in cellular scenarios. The purpose is to evaluate the dispersion and attenuation caused by...
Provided by Tokyo Institute of Technology
-
White Papers
On the Channel Sounding Technique Using MIMO Software Radio Architecture
February 5, 2010, 12:00am PST
Advantages and issues of the channel sounding technique using MIMO software radio architecture are discussed. By end of February, the first prototype consisting one transmitter unit and one...
Provided by Tokyo Institute of Technology
-
White Papers
Statistical Characterization of 4.5 GHz Narrowband On-Body Propagation Channel
February 5, 2010, 12:00am PST
This paper presents the characterization of on-body propagation channel with specific activity of a body analyzing measurement results of a male subject in a radio anechoic chamber. To capture the...
Provided by Tokyo Institute of Technology
-
White Papers
Performance Evaluation of Cyclic Detector in Cognitive Radio
November 18, 2007, 12:00am PST
Recently, the Notice of Proposed Rule Making (NPRM) of the Federal Communications Commission (FCC) in United States (US) has released the spectrum allocated to the broadcast TeleVision (TV) for...
Provided by Tokyo Institute of Technology
-
White Papers
Elastic Stream Computing With Clouds
April 14, 2011, 12:00am PDT
Stream computing, also known as data stream processing, has emerged as a new processing paradigm that processes incoming data streams from tremendous numbers of sensors in a real-time fashion....
Provided by Tokyo Institute of Technology
-
White Papers
Statistical Mechanical Analysis of the Kronecker Channel Model for MIMO Wireless Communication
September 18, 2009, 12:00am PDT
The Kronecker channel model of wireless communication is analyzed using statistical mechanics methods. In the model, spatial proximities among transmission/reception antennas are taken into...
Provided by Tokyo Institute of Technology
-
White Papers
Problems in Application of LDPC Codes to Information Reconciliation in Quantum Key Distribution Protocols
September 13, 2009, 12:00am PDT
The information reconciliation in a quantum key distribution protocol can be studied separately from other steps in the protocol. The problem of information reconciliation can be reduced to that...
Provided by Tokyo Institute of Technology
-
White Papers
Strongly Secure Privacy Amplification Cannot Be Obtained by Encoder of Slepian-Wolf Code
March 8, 2011, 12:00am PST
Privacy amplification is a technique to distill a secret key from a random variable by a function so that the distilled key and eavesdropper's random variable are statistically independent. There...
Provided by Tokyo Institute of Technology
-
White Papers
Statistical Mechanical Analysis of the Linear Vector Channel in Digital Communication
November 6, 2007, 12:00am PST
A statistical mechanical framework to analyze linear vector channel models in digital wireless communication is proposed for a large system. The framework is a generalization of that proposed for...
Provided by Tokyo Institute of Technology
-
White Papers
Security of Encryption Schemes in Weakened Random Oracle Models
March 5, 2010, 12:00am PST
Liskov proposed several weakened versions of the random oracle model, called Weakened Random Oracle Models (WROMs), to capture the vulnerability of ideal compression functions, which are expected...
Provided by Tokyo Institute of Technology
-
White Papers
Characterization of the Relations Between Information-Theoretic Non-Malleability, Secrecy, and Authenticity
February 1, 2011, 12:00am PST
Roughly speaking, an encryption scheme is said to be non-malleable, if no adversary can modify a ciphertext so that the resulting message is meaningfully related to the original message. The...
Provided by Tokyo Institute of Technology
-
White Papers
Autonomous Real-Time Navigation for Service Level Agreement in Distributed Information Service System
January 1, 2011, 12:00am PST
In today's aggressive and competitive marketplace, there is substantial need for corporations to incorporate Service Level Agreement (SLA) in their enterprise; and keep user differentiation with...
Provided by Tokyo Institute of Technology
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