Beijing University of Posts and Telecommunications

Displaying 1-40 of 81 results

  • White Papers // Dec 2013

    Cloud Service-Aware Location Update in Mobile Cloud Computing

    Mobile devices are becoming the primary platforms for many users who always roam around when accessing the cloud computing services. From this, the cloud computing is integrated into the mobile environment by introducing a new paradigm, mobile cloud computing. In the context of mobile computing, the battery life of mobile...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Jul 2013

    A Novel Dynamic Identity based Authentication Scheme for Multi-Server Environment using Smart Cards

    Remote user authentication scheme with key agreement is a very practical mechanism to verify a remote user and then provide secure communication. Furthermore, many network environments have been becoming multi-server based due to the rapid growth of computer networks. Therefore, more and more researches have been focused on proposing smart...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // May 2013

    An Efficient Dynamic ID Based Remote User Authentication Scheme Using Self-Certified Public Keys for Multi-Server Environment

    Recently, Li et al. analyzed Lee et al.'s multi-server authentication scheme and proposed a novel smart card and dynamic ID based remote user authentication scheme for multi-server environments. They claimed that their scheme can resist several kinds of attacks. However, through careful analysis, the authors find that Li et al.'s...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Apr 2013

    An Anonymous User Authentication with Key Agreement Scheme Without Pairings for Multiserver Architecture Using SCPKs

    With advancement of computer community and widespread dissemination of network applications, users generally need multiple servers to provide different services. Accordingly, the multi-server architecture has been prevalent, and designing a secure and efficient remote user authentication under multi-server architecture becomes a nontrivial challenge. In last decade, various remote user authentication...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Apr 2013

    A Truthful and Low-Overhead Routing Protocol for Ad Hoc Networks

    Nodes in wireless ad hoc networks depend on others for forwarding packets hop by hop. However, nodes may behave selfishly and do not forward packets for saving their limited resources. Approaches based on Vickrey, Clarke and Groves (VCG) pay to the intermediate nodes a premium over their actual costs to...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Nov 2012

    A Novel Multi-Objective Relay-Jammer Pair Selection Scheme in Wireless Cooperative Networks

    To further enhance the Quality of Service (QoS), this paper proposes a novel multi-objective relay-jammer pair selection scheme in wireless cooperative networks where the wireless channels are modeled as first-order Finite-State Markov Channels (FSMCs). The FSMC model is used to approximate the time variations of the average received Signal-to-Noise Ratio...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Nov 2012

    Random Circulant Orthogonal Matrix Based Analog Compressed Sensing

    Analog Compressed Sensing (CS) has attracted considerable research interest in sampling area. One of the promising analog CS technique is the recently proposed Modulated Wideband Converter (MWC). However, MWC has a very high hardware complexity due to its parallel structure. To reduce the hardware complexity of MWC, this paper proposes...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Nov 2012

    Minimizing Electricity Cost in Geographical Virtual Network Embedding

    In light of rapid increase of electricity cost, many business organizations have to find new ways to cut the electricity bill. This paper studies how to reduce the electricity cost in geographical inter-domain virtual network embedding, which embeds virtual networks requested by users to multiple geographically distributed substrate networks run...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Nov 2012

    Topology-Aware Virtual Network Embedding Through Bayesian Network Analysis

    Multiple heterogeneous virtual networks are given the ability to run on a shared infrastructure simultaneously as independent slices in the network virtualization environment. However, a major challenge is how to map multiple virtual networks, with specific node and link constraints, onto the shared substrate network, known as virtual network embedding...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // May 2012

    Zero-Forcing Based MIMO Two-Way Relay With Relay Antenna Selection: Transmission Scheme and Diversity Analysis

    The combination of Physical-layer Network Coding (PNC) and Multiple-Input Multiple-Output (MIMO) is expected to improve the throughput of two-way relay network. In this paper, the authors propose a zero-forcing based MIMO two-way relay scheme in conjunction with a simple Max-Min relay antenna selection. This scheme solves the unpractical constraint encountered...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // May 2012

    Optimal Power Allocation and Relay Selection in Dual-Hop and Multi-Hop Cognitive Networks

    In this paper, the authors consider a cognitive relay network which contains a source node, a destination node and a group of network clusters each consisting of several cognitive relay nodes. They choose one relay node with the optimal power value in each cluster to aid the data transmission from...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // May 2012

    Spectrum Sharing and Resource Allocation for Energy-Efficient Heterogeneous Cognitive Radio Networks With Femtocells

    In heterogeneous wireless networks with femtocells, the issue of interference between femtocells and macrocells should be carefully considered. Using cognitive radio for interference management is a promising technique in heterogeneous wireless networks with femtocells. In this paper, the authors study the energy efficiency aspect of spectrum sharing and resource allocation...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // May 2012

    An Indirect Reciprocity Game Theoretic Framework for Dynamic Spectrum Access

    In this paper, the authors propose a spectrum access framework to address the efficient allocation of channels of a Base Station (BS) by stimulating cooperation between Primary Users (PUs) and Secondary Users (SUs). They model the cooperation stimulation problem as an indirect reciprocity game, where SUs help PUs relay information...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // May 2012

    Interference-Aware Resource Allocation in Co-Channel Deployment of OFDMA Femtocells

    Macrocells may suffer serious uplink interference introduced by the deployment of co-channel femtocells. In this paper, an interference-aware pricing-based resource allocation algorithm for co-channel femtocells is proposed to alleviate their interference to macrocells without degrading the femtocell's capacity. The subchannel and power allocation problem is modeled as a non-cooperative game....

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // May 2012

    Joint Time-Varying Channel Estimation With Dual-ICI Cancellation in OFDM Systems

    Channel estimation plays a vital role in coherent detection and demodulation in Orthogonal Frequency Division Multiplexing (OFDM) systems. However, the channel time-variation leads to tremendous unknown parameters to estimate and detrimental Inter-Carrier Interference (ICI) for pilot-aided channel estimation, degrading the system performance significantly. This paper proposes a joint estimation of...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // May 2012

    Hybrid Virtual Network Embedding With K-Core Decomposition and Time-Oriented Priority

    Network virtualization provides a powerful tool to allow multiple networks, each customized to a specific purpose, to run on a shared substrate. However, a big challenge is how to map multiple virtual networks onto specific nodes and links in the shared substrate network, known as virtual network embedding problem. Previous...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // May 2012

    Radio Admission Control Scheme for High-Speed Railway Communication With MIMO Antennas

    Along with the wide deployment of high-speed railway at more than 300 km/h, providing various services effectively for users in the train becomes both practical demand and interesting challenge for wireless communication. Due to the specific environment for high-speed railway, existing Radio Admission Control (RAC) algorithms could not suit the...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // May 2012

    TCP Performance Improvement in Wireless Networks With Cooperative Communications and Network Coding

    Cooperative communications and network coding are considered as effective technologies to provide robust and efficient communications. Most existing studies focus on lower layer performance, such as bandwidth efficiency, and little attention has been paid to the performance in the upper layers, such as Transmission Control Protocol (TCP) throughput. In this...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // May 2012

    A Novel Time Domain Approach for the Downlink Pilot Design of Multiantenna OFDM Systems

    A novel time domain approach is introduced for the downlink pilot design of multi-antenna OFDM systems. Zero correlation zone sequence sets are used to construct the pilot sequences so that the intra- and inter-cell interferences between pilots are cancelled. The pilot sequences are superimposed on the time domain data signals...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // May 2012

    A Novel Frame Structure for Centralized Cooperative Cognitive Networks to Achieve Overhead-Throughput Tradeoff

    With the rapid development of wireless communication networks, more and more spectrum resources are required and the scarcity in spectrum has become a serious concern. Cognitive Radio (CR) technology, which enables Secondary User (SU) to access the idle frequency bands known as the spectrum hole, has been proposed to improve...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Mar 2012

    On the Performance of Opportunistic Amplify-and-Forward Relaying in Two-Wave With Diffuse Power Fading Channels

    This paper considers cooperative networks in independent and non-identical Two-Wave with Diffuse Power (TWDP) fading channels using opportunistic Amplify-and-Forward (AF) relaying. The authors derive new closed-form expressions for the outage probability and Symbol Error Rate (SER) in the high Signal-to-Noise Ratio (SNR) regime. Such expressions can be applied to opportunistic...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Mar 2012

    System-Level Analysis and Evaluation of SF-DC Transmit Mode in HSPA+ System

    Cooperated multi-point technique in HSPA+ system has not been paid attention until the Single Frequency Dual Cell (SF-DC) mode, where one User Equipment (UE) may be served by dual Node-Bs simultaneously in the single carrier frequency network, is proposed recently. In the previous research, the system-level performance with SF-DC operation...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Mar 2012

    Mobile Sensor Scheduling for Timely Sweep Coverage

    Mobile sensors are a viable choice for providing monitoring service on a set of Points of Interest (PoIs) in a large sensing field. In some applications, each PoI should be covered periodically (sweep coverage), and the collected data should be delivered to the sink node timely (timely transmission), namely both...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Mar 2012

    Through-Wall Tracking With Radio Tomography Networks Using Foreground Detection

    This paper presents a novel method for tracking a moving person or object through walls using wireless networks. The method takes advantage of the motion-induced variation of Received Signal Strength (RSS) measurements in a radio tomography network. Based on real measurements of a deployed network, the authors show that the...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Mar 2012

    Novel Recursive Approach for OFDM Channel Estimation Under Highly Mobile Conditions

    This paper proposes a novel recursive approach for Orthogonal Frequency Division Multiplexing (OFDM) channel estimation over highly mobile channels without any priori channel statistics. The key idea is to decompose each objective channel into the known component and the rest for estimation. The known component is the output of the...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Mar 2012

    A Separate-SMDP Approximation Technique for RRM in Heterogeneous Wireless Networks

    This paper proposes the separate-SMDP approximation technique to solve the dimensionality problem of the Semi-Markov Decision Process (SMDP) model for Radio Resource Management (RRM). The proposed separate-SMDP model approximates the original complex SMDP Linear Programming (LP) problem by building a series of simple SMDP LP problems. The estimated policy results...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Mar 2012

    A Physarum-Inspired Algorithm for Minimal Exposure Problem in Wireless Sensor Networks

    Exposure problem, which corresponds to the quality of coverage, is a fundamental problem in wireless sensor networks. In this paper, the authors exploit a cellular computing model in the physarum for solving the minimal exposure problem. They first use the road-network among all Points of Interesting (PoIs) in the monitoring...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Mar 2012

    Collaborative Spectrum Sensing in Multi-Channel Cognitive Networks: A Coalition Game Approach

    Collaborative spectrum sensing among Secondary Users (SUs) in Cognitive Radio (CR) networks is shown to yield a significant performance improvement. However, much previous work in CR networks focus on single channel sensing performed by SU cooperatively while spectrum sensing on multiple channels is largely ignored. In order to overcome the...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Mar 2012

    Distributed Cooperative Spectrum Sensing for Cognitive Radio Networks

    Spectrum sensing is an essential functionality of cognitive radio networks. In this paper, a non-cooperative game framework is proposed for studying the interactions between multiple secondary strategic users in spectrum sensing. The licensed spectrum of single primary user is divided into K sub-bands, each secondary user operates exclusively in one...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Mar 2012

    A Distributed Algorithm Combining Power Control and Scheduling for Femtocell Networks

    In this paper, the authors present a distributed algorithm combining power control and scheduling for densely deployed femtocells networks. The strong interference in the downlink from the femtocells should be well mitigated to satisfy the Quality of Service (QoS) requirement of femtocell users. The considered optimization problem is formulated as...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Mar 2012

    An Optimization Method for P2P Resource Scheduling

    Because the information exchange between peers of P2P application system is limited by the real network topology, effective resource scheduling technology becoming an important issue. Without change to peers' reciprocity and self-organization, an optimization method based on ant colony algorithm for P2P resource scheduling is proposed. The task of system...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Mar 2012

    Forwarders Selection Mechanism Based on Packets Transmission Rate for Opportunistic Routing in Wireless Mesh Network

    In this paper, a novel routing metric TRE (Transmission Rate based on EEPEST (End-to-End Probability of Effective Successful Transmission)) is proposed to choose the forwarder list, which is based on total effective successful transmission rate. It considers multi-links contribution, instead of one "Best" link information used in ETX. The extensive...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Feb 2012

    Energy-Aware Combinatorial Scheduling in Cloud Datacenter

    Cloud Computing is evolving as a key computing platform for sharing resources that include infrastructures, software, applications, and business processes. As the scale of cloud datacenter becomes larger and larger, how to reduce energy consumption in large-scale datacenters become a big problem to resolve as soon as possible. How to...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Feb 2012

    Unified Authentication Scheme Based on IBE in Trusted Network

    The existing unified authentication schemes are based on Public Key Infrastructure (PKI)/Privilege Management Infrastructure (PMI), WS-Security, Kerberos etc. But they can't support the developing Trusted Network Connect (TNC) environment. To solve the problem, a unified authentication scheme supporting multi-authentication modes based on Identity-Based Encryption (IBE) in trusted network named IEUAS...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Feb 2012

    A Novel Analytical Model for IEEE802.11e WLANs With 3-D Markov Chain

    IEEE 802.11e is specified to provide prioritized Quality of Service (QoS) guarantee in Wireless Local Area Networks (WLANs). A comprehensive investigation of the performance of Enhanced Distributed Channel Access (EDCA) for WLANs is reported in this paper. Most of the previous related paper is based on saturation condition which is...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Jan 2012

    Energy-Efficient Spectrum Sharing and Power Allocation in Cognitive Radio Femto-cell Networks

    Both cognitive radio and femtocell have been considered as promising techniques in wireless networks. However, most of previous works are focused on spectrum sharing and interference avoidance, and the energy efficiency aspect is largely ignored. In this paper, the authors study the energy efficiency aspect of spectrum sharing and power...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Jan 2012

    New Cloud Computing Network Architecture Directed At Multimedia

    Multimedia computing has caused increasing resource consumption and computational overhead. This paper pays its considerable attention to cloud computing in handling multimedia applications and services effectively and efficiently. The authors present a solution to reconstruct the network architecture of multimedia field based on cloud computing to integrate multi-service platforms for...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Jan 2012

    Energy-Aware and Revenue-Enhancing Combinatorial Scheduling in Virtualized of Cloud Datacenter

    As the scale of cloud datacenter becomes larger and larger, the energy consumption and revenue enhancing of the cloud datacenter will grow rapidly. How to improve high-throughput computing resource allocation strategy was taken into account. High-throughput computing resource consolidation is an effective method to increase resource utilization and in turn...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Dec 2011

    Analysis and Improvement of a Strongly Secure Certificateless Key Exchange Protocol Without Pairing

    Recently, Yang and Tan proposed a certificate less key exchange protocol without pairing, and claimed their scheme satisfies forward secrecy, which means no adversary could derive an already-established session key unless the full user secret keys (including a private key and an ephemeral secret key) of both communication parties are...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Dec 2011

    A Novel Iterative Algorithm for Time-Varying Channel Estimation in OFDM Systems

    A novel iterative channel estimation algorithm for Orthogonal Frequency-Division Multiplexing (OFDM) systems in fast time-varying environment is proposed. Instead of directly estimate the original channel taps, the proposed estimation focus on the rest channel part from the original channel taps subtracted by the prior estimation results in the absence of...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // May 2012

    Zero-Forcing Based MIMO Two-Way Relay With Relay Antenna Selection: Transmission Scheme and Diversity Analysis

    The combination of Physical-layer Network Coding (PNC) and Multiple-Input Multiple-Output (MIMO) is expected to improve the throughput of two-way relay network. In this paper, the authors propose a zero-forcing based MIMO two-way relay scheme in conjunction with a simple Max-Min relay antenna selection. This scheme solves the unpractical constraint encountered...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // May 2012

    Optimal Power Allocation and Relay Selection in Dual-Hop and Multi-Hop Cognitive Networks

    In this paper, the authors consider a cognitive relay network which contains a source node, a destination node and a group of network clusters each consisting of several cognitive relay nodes. They choose one relay node with the optimal power value in each cluster to aid the data transmission from...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // May 2012

    Spectrum Sharing and Resource Allocation for Energy-Efficient Heterogeneous Cognitive Radio Networks With Femtocells

    In heterogeneous wireless networks with femtocells, the issue of interference between femtocells and macrocells should be carefully considered. Using cognitive radio for interference management is a promising technique in heterogeneous wireless networks with femtocells. In this paper, the authors study the energy efficiency aspect of spectrum sharing and resource allocation...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // May 2012

    An Indirect Reciprocity Game Theoretic Framework for Dynamic Spectrum Access

    In this paper, the authors propose a spectrum access framework to address the efficient allocation of channels of a Base Station (BS) by stimulating cooperation between Primary Users (PUs) and Secondary Users (SUs). They model the cooperation stimulation problem as an indirect reciprocity game, where SUs help PUs relay information...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // May 2012

    Interference-Aware Resource Allocation in Co-Channel Deployment of OFDMA Femtocells

    Macrocells may suffer serious uplink interference introduced by the deployment of co-channel femtocells. In this paper, an interference-aware pricing-based resource allocation algorithm for co-channel femtocells is proposed to alleviate their interference to macrocells without degrading the femtocell's capacity. The subchannel and power allocation problem is modeled as a non-cooperative game....

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // May 2012

    Joint Time-Varying Channel Estimation With Dual-ICI Cancellation in OFDM Systems

    Channel estimation plays a vital role in coherent detection and demodulation in Orthogonal Frequency Division Multiplexing (OFDM) systems. However, the channel time-variation leads to tremendous unknown parameters to estimate and detrimental Inter-Carrier Interference (ICI) for pilot-aided channel estimation, degrading the system performance significantly. This paper proposes a joint estimation of...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // May 2012

    Hybrid Virtual Network Embedding With K-Core Decomposition and Time-Oriented Priority

    Network virtualization provides a powerful tool to allow multiple networks, each customized to a specific purpose, to run on a shared substrate. However, a big challenge is how to map multiple virtual networks onto specific nodes and links in the shared substrate network, known as virtual network embedding problem. Previous...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // May 2012

    Radio Admission Control Scheme for High-Speed Railway Communication With MIMO Antennas

    Along with the wide deployment of high-speed railway at more than 300 km/h, providing various services effectively for users in the train becomes both practical demand and interesting challenge for wireless communication. Due to the specific environment for high-speed railway, existing Radio Admission Control (RAC) algorithms could not suit the...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // May 2012

    TCP Performance Improvement in Wireless Networks With Cooperative Communications and Network Coding

    Cooperative communications and network coding are considered as effective technologies to provide robust and efficient communications. Most existing studies focus on lower layer performance, such as bandwidth efficiency, and little attention has been paid to the performance in the upper layers, such as Transmission Control Protocol (TCP) throughput. In this...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // May 2012

    A Novel Time Domain Approach for the Downlink Pilot Design of Multiantenna OFDM Systems

    A novel time domain approach is introduced for the downlink pilot design of multi-antenna OFDM systems. Zero correlation zone sequence sets are used to construct the pilot sequences so that the intra- and inter-cell interferences between pilots are cancelled. The pilot sequences are superimposed on the time domain data signals...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // May 2012

    A Novel Frame Structure for Centralized Cooperative Cognitive Networks to Achieve Overhead-Throughput Tradeoff

    With the rapid development of wireless communication networks, more and more spectrum resources are required and the scarcity in spectrum has become a serious concern. Cognitive Radio (CR) technology, which enables Secondary User (SU) to access the idle frequency bands known as the spectrum hole, has been proposed to improve...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Mar 2012

    On the Performance of Opportunistic Amplify-and-Forward Relaying in Two-Wave With Diffuse Power Fading Channels

    This paper considers cooperative networks in independent and non-identical Two-Wave with Diffuse Power (TWDP) fading channels using opportunistic Amplify-and-Forward (AF) relaying. The authors derive new closed-form expressions for the outage probability and Symbol Error Rate (SER) in the high Signal-to-Noise Ratio (SNR) regime. Such expressions can be applied to opportunistic...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Mar 2012

    System-Level Analysis and Evaluation of SF-DC Transmit Mode in HSPA+ System

    Cooperated multi-point technique in HSPA+ system has not been paid attention until the Single Frequency Dual Cell (SF-DC) mode, where one User Equipment (UE) may be served by dual Node-Bs simultaneously in the single carrier frequency network, is proposed recently. In the previous research, the system-level performance with SF-DC operation...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Mar 2012

    Mobile Sensor Scheduling for Timely Sweep Coverage

    Mobile sensors are a viable choice for providing monitoring service on a set of Points of Interest (PoIs) in a large sensing field. In some applications, each PoI should be covered periodically (sweep coverage), and the collected data should be delivered to the sink node timely (timely transmission), namely both...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Mar 2012

    Through-Wall Tracking With Radio Tomography Networks Using Foreground Detection

    This paper presents a novel method for tracking a moving person or object through walls using wireless networks. The method takes advantage of the motion-induced variation of Received Signal Strength (RSS) measurements in a radio tomography network. Based on real measurements of a deployed network, the authors show that the...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Mar 2012

    Novel Recursive Approach for OFDM Channel Estimation Under Highly Mobile Conditions

    This paper proposes a novel recursive approach for Orthogonal Frequency Division Multiplexing (OFDM) channel estimation over highly mobile channels without any priori channel statistics. The key idea is to decompose each objective channel into the known component and the rest for estimation. The known component is the output of the...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Mar 2012

    A Separate-SMDP Approximation Technique for RRM in Heterogeneous Wireless Networks

    This paper proposes the separate-SMDP approximation technique to solve the dimensionality problem of the Semi-Markov Decision Process (SMDP) model for Radio Resource Management (RRM). The proposed separate-SMDP model approximates the original complex SMDP Linear Programming (LP) problem by building a series of simple SMDP LP problems. The estimated policy results...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Mar 2012

    A Physarum-Inspired Algorithm for Minimal Exposure Problem in Wireless Sensor Networks

    Exposure problem, which corresponds to the quality of coverage, is a fundamental problem in wireless sensor networks. In this paper, the authors exploit a cellular computing model in the physarum for solving the minimal exposure problem. They first use the road-network among all Points of Interesting (PoIs) in the monitoring...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Mar 2012

    Collaborative Spectrum Sensing in Multi-Channel Cognitive Networks: A Coalition Game Approach

    Collaborative spectrum sensing among Secondary Users (SUs) in Cognitive Radio (CR) networks is shown to yield a significant performance improvement. However, much previous work in CR networks focus on single channel sensing performed by SU cooperatively while spectrum sensing on multiple channels is largely ignored. In order to overcome the...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Mar 2012

    Distributed Cooperative Spectrum Sensing for Cognitive Radio Networks

    Spectrum sensing is an essential functionality of cognitive radio networks. In this paper, a non-cooperative game framework is proposed for studying the interactions between multiple secondary strategic users in spectrum sensing. The licensed spectrum of single primary user is divided into K sub-bands, each secondary user operates exclusively in one...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Mar 2012

    A Distributed Algorithm Combining Power Control and Scheduling for Femtocell Networks

    In this paper, the authors present a distributed algorithm combining power control and scheduling for densely deployed femtocells networks. The strong interference in the downlink from the femtocells should be well mitigated to satisfy the Quality of Service (QoS) requirement of femtocell users. The considered optimization problem is formulated as...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Dec 2011

    Analysis and Improvement of a Strongly Secure Certificateless Key Exchange Protocol Without Pairing

    Recently, Yang and Tan proposed a certificate less key exchange protocol without pairing, and claimed their scheme satisfies forward secrecy, which means no adversary could derive an already-established session key unless the full user secret keys (including a private key and an ephemeral secret key) of both communication parties are...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Oct 2009

    Group CRM: A New Telecom CRM Framework From Social Network Perspective

    The structure of customer communication network provides a natural way to understand customers' relationships. Traditional customer relationship management (CRM) methods focus on various customer profitability models, and they are short of ways to understand the social interactions. Graph mining and social network analysis provide ways to understand the relationships between...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Feb 2010

    Efficient Access Control of Sensitive Data Service in Outsourcing Scenarios

    With the rapid application of service-oriented technologies, service and data outsourcing has become a practical and useful computing paradigm. Combined use of access control and cryptography was proposed by many researchers to protect information in this outsourcing scenario. However, existing approaches often limit dynamical update of access control policy, or...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Nov 2010

    A Selection Region Based Routing Protocol for Random Mobile Ad Hoc Networks With Directional

    In this paper, the authors propose a selection region based multihop routing protocol with directional antennas for wireless mobile ad hoc networks, where the selection region is defined by two parameters: a reference distance and the beamwidth of the directional antenna. At each hop, they choose the nearest node to...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Sep 2010

    Joint Uplink and Downlink Relay Selection in Cooperative Cellular Networks

    The authors consider relay selection technique in a cooperative cellular network where user terminals act as mobile relays to help the communications between Base Station (BS) and mobile station (MS). A novel relay selection scheme, called Joint Uplink and Downlink Relay Selection (JUDRS), is proposed in this paper. Specifically, they...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Apr 2010

    Energy-Efficient Relay Selection and Optimal Relay Location in Cooperative Cellular Networks With Asymmetric Traffic

    Energy-efficient communication is an important requirement for mobile relay networks due to the limited battery power of user terminals. This paper considers energy-efficient relaying schemes through selection of mobile relays in cooperative cellular systems with asymmetric traffic. The total energy consumption per information bit of the battery-powered terminals, i.e., the...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Nov 2008

    Joint Transmitter-Receiver Design for the Downlink Multiuser Spatial Multiplexing MIMO System

    In the multiuser spatial multiplexing Multiple-Input Multiple-Output (MIMO) system, the joint Transmitter-Receiver (Tx-Rx) design is investigated to minimize the weighted sum power under the post-processing Signal-to-Interference-and-Noise Ratio (post-SINR) constraints for all subchannels. Firstly, the authors show that the uplink-downlink duality is equivalent to the Lagrangian duality in the optimization problems....

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Jan 2010

    Enhanced MILSA Architecture for Naming, Addressing, Routing and Security Issues in the Next Generation Internet

    MILSA (Mobility and Multihoming supporting Identifier Locator Split Architecture) has been proposed to address the naming and addressing challenges for NGI (Next Generation Internet). The authors present several design enhancements for MILSA which include a hybrid architectural design that combines "Core-edge separation approach" and "Split approach", a security-enabled and logically...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Aug 2010

    Design and Analysis of a Hash Ring-Iterative Structure

    The authors propose a new type of hash iterative structure - the ring-iterative structure with feedback which is subdivided into the Single Feedback Ring Iteration and the Multiple Feedback Ring Iteration, namely SFRI and MFRI. Prove that SFRI is at least equivalent to the MD structure in security, and MFRI...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Jun 2009

    A General Stochastic Spatial MIMO Channel Model for Evaluating Various MIMO Techniques

    A general stochastic spatial MIMO channel model is proposed for evaluating various MIMO techniques in this paper. It can generate MIMO channels complying with various MIMO configurations such as smart antenna, spatial diversity and spatial multiplexing. The modeling method produces the stochastic fading involving delay spread, Doppler spread, DOA (Direction...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Sep 2010

    A Priority and SDB Based Admission Control in IEEE 802.16 Systems

    In IEEE 802.16 systems, the algorithm of Admission Control (AC) is very important in guaranteeing the Quality of Service (QoS) and managing service flows. However, the IEEE 802.16 standards do not specify any related strategies or algorithms on AC. In order to improve the system performance and satisfy the QoS...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Mar 2011

    A New Secure Strategy in Small-Scale IEEE 802.11 Wireless Local Area Networks With Web Authentication and Virtual Local Area Network

    As the main secret-key encryption techniques of the Wireless Local Area Network (WLAN) have been proven to be unsafe, wireless network security is faced with serious challenges. It is unpractical for home users and small companies to purchase expensive network equipments to improve the network security. Therefore, the secure strategy...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Jun 2011

    Self-Aware Services of NGSDP:Using Bayesian Networks for Measuring Quality of Convergent Services

    The authors propose a general architecture and implementation for the autonomous assessment of quality of arbitrary service elements in the convergent service environments. They describe a quality engine, which is the central component of the proposed architecture of self-aware convergent services of NGSDP. The quality engine combines domain independent statistical...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Feb 2011

    A Novel Virtual Network Mapping Algorithm for Cost Minimizing

    Resources assigned to virtual network are not optimal resources, which are caused by some scarce resources. To solve this problem, this paper proposes a novel virtual network mapping algorithm that can realize mapping cost minimizing, called CMVNMA, based on two characteristics of network virtualization environment that is virtual network has...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Feb 2011

    Improved Performance of the Basic Array of a Microstrip Adaptive Antenna Using a Tree Structure of Patch Fed by Electromagnetic Coupling

    The aim of this paper is to improve the performance of a basic microstrip antenna array using a tree structure patch supplied by electromagnetic coupling. The developed network which contains two subnets, a distribution subnet and a scanning subnet, is considered as a first step to design an adaptive microstrip...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Jul 2010

    Enhanced IMS Handoff Mechanism for QoS Support Over Heterogeneous Network

    IP Multimedia Subsystem (IMS) is over IP network architecture, but mobile IP cannot directly support session mobility controlled by session initiation protocol-based signaling. The long signaling delay for session reestablishment in application layer always results in session interruptions during the handoff. Therefore, handoff poses a challenge for Quality of Service...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Sep 2010

    Downlink Scheduling and Radio Resource Allocation in Adaptive OFDMA Wireless Communication Systems for User-Individual QoS

    In this paper, the authors address the problem of adaptive Radio Resource Allocation (RRA) and packet scheduling in the downlink of a cellular OFDMA system, and propose a downlink Multi-carrier Proportional Fair (MPF) scheduler and its joint with adaptive RRA algorithm to distribute radio resources among multiple users according to...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Aug 2010

    An Energy-Efficient Virtual MIMO Transmission Scheme for Cluster-Based Wireless Sensor Networks

    In this paper, a cluster-based virtual Multiple-Input Multiple-Output (MIMO) transmission scheme is proposed for energy-constrained wireless sensor networks. Compared with previous work, there are two new aspects in this scheme. Firstly, the proposed scheme makes use of multiple cluster heads cooperative transmission instead of one. Secondly, the Space-Time Block Coding...

    Provided By Beijing University of Posts and Telecommunications

  • White Papers // Feb 2010

    Investigation of Cooperation Technologies in Heterogeneous Wireless Networks

    Heterogeneous wireless networks based on varieties of Radio Access Technologies (RATs) and standards will coexist in the future. In order to exploit this potential multiaccess gain, it is required that different RATs are managed in a cooperative fashion. This paper proposes two advanced functional architecture supporting the functionalities of interworking...

    Provided By Beijing University of Posts and Telecommunications