yusuke1997/dblp-id-title huggingface dataset:
Reconfigurable Intelligent Surface for 5G NR Uplink Coverage Enhancement
Rate-Maximizing OFDM Pilot Patterns for UAV Communications in Nonstationary A2G Channels
Evaluating the Energy Balance of Solar-Powered Coordinated Wireless Backhaul Networks
Cooperative Positioning for the Converged Networks
Comparison of Lane Changing Algorithms between NGSIM and CORSIM
Proxy Individual Positioning via IEEE 802.11 Monitor Mode and Fine-Tuned Analytics
Lowering Area Power Consumption via Coded Cooperation Assisted by Layered Relays
A New Dedicated Pilot Allocation Scheme in Multiuser MIMO OFDM with Vector Perturbation
CDMA receiver performance for multiple-input multiple-output antenna systems
Measurements Based mmW Channel Modelling in Railway Environments
Field Experiment of Multi-BS Cooperative Transmission Control over X2 Interface for LTE/LTE-Advanced
A novel code assignment scheme for W-CDMA systems
Statistical Precoder Design for Spatial Multiplexing Systems in Correlated MIMO Fading Channels
Turbo-AI, Part I: Iterative Machine Learning Based Channel Estimation for 2D Massive Arrays
Predicut - A Machine Learning Model For Online Prediction of Cut-In Manoeuvre For Autonomous Vehicles
Multimodal Model Based NLOS Identification for Ultra-Wideband Ranging
Empirical Study on Ultra-Wideband Vehicle Radar
Outage Probability Analysis of Multi-Relay Delay-Limited Hybrid-ARQ Channels
Energy Efficient Device to Device Communication by Resource Efficiency Optimization
Reinforcement Learning based Multi-Attribute Slice Admission Control for Next-Generation Networks in a Dynamic Pricing Environment
A Dynamic PF Scheduler to Improve the Cell Edge Performance
Synchronization of multiple access points in the IEEE 802.11 point coordination function
Half-Duplex ALOHA Systems for Low Power Wide Area Networks
Supporting Sporadic DENM Traffic over 5G-V2X Sidelink in the Autonomous Mode
Multiple Carrier Frequency Offset and Channel State Estimation in the Fading Channel
A Novel Beam Domain Channel Model for Orbital Angular Momentum Communication Systems with Massive Uniform Circular Array
Cost Based Local Forwarding Transmission Schemes for Two-Hop Cellular Networks
A Standardized Path Loss Model for the GSM-Railway Based High-Speed Railway Communication Systems
Comparison of methods of computing correlated lognormal sum distributions and outages for digital wireless applications
Low-complexity Delay-Doppler Symbol DNN for OTFS Signal Detection
Optimization of Directivity, Realized Gain and Efficiency for Multi-dimensional Antenna Array
Performance Analysis of Intelligent Reflecting Surface-aided NR-V2X Sidelink Communications
On the Performance of Network Coding for Multicast Data Delivery in Large Scale Mobile Ad Hoc Networks
On the Cooperative and Non-Cooperative Relaying in WiMAX Communication Systems
Voice over IP Realized for the 3GPP Long Term Evolution
Joint Dynamic Spectrum Access and Multi-Relay Selection: A Matching-Theory-Based Approach
Car-to-Cloud Communication Traffic Analysis Based on the Common Vehicle Information Model
Quickest Detection Framework for Signal Integrity Monitoring in Low-Cost GNSS Receivers
Enhancing Improved Heuristic Drift Elimination for Wrist-Worn PDR Systems in Buildings
Interference and Background Noise Effects in Wireless Networks with Poisson Fields of Transmitters
A 2-Dimensional Transmit Beamforming Method: Performance Results for Slow Fading Channels
Optimal Multi-Level Amplitude-Shift Keying for Partially-coherent SIMO Wireless Communication System in Rician Fading Environment
Influence of Degree Distribution of Irregular LDPC Codes on HARQ Performance
UAV Trajectory Optimization for Sensing Exploiting Target Location Distribution Map
Measurement-Based Latency Evaluation and the Theoretical Analysis for Massive IoT Applications Using Bluetooth Low Energy
Degradation in Convolutionally Coded V-BLAST System and A Performance Improvement Method
Weighted Fair Precoding Based on Traffic Demands for Multibeam Satellite Systems
Modeling and Optimization of Renewable-Energy Sharing among Base Stations as a Minimum-Cost-Maximum-Flow Problem
Optimized Power Allocation Scheme for Land Mobile Satellite Cooperative Diversity Communications
A Synergistic Framework for High-Volume Image Acquisition and Transmission Through Semantic-Optical Communication in UIoT Networks
Increasing Robustness of Network Coding Using Non-Orthogonal Decode-and-Forward Protocol
Low-Complexity Spectral Precoding for Rectangularly Pulsed OFDM
UAV-Assisted Data Rate Maximization Under 3-D Channel Model
Joint Association, Transmission Power Allocation and Positioning of Flying Base Stations Considering Limited Backhaul
A Frame-Level HEVC Rate Control Algorithm for Videos with Complex Scene over Wireless Network
MMSE Criterion Fast Decision Feedback Equalization Algorithm for Spatial Multiplexing Systems
ROLIG3A: Protecting Group Secret Key Generation Procedures against Malicious Attackers
Comparison of frequency offset estimation techniques for burst OFDM
Layered Random Beamforming OFDMA with Fair Scheduling Algorithms
Delay-throughput performance of packet service in UMTS
Multi-User Detections for Sparse Code Multiple Access System
A Robust Timing and Frequency Synchronization Scheme for DVB-T2 System
Receiver structures for MIMO-SC/FDE Systems
Adaptable Link Quality Estimation for Multi Data Rate Communication Networks
87th IEEE Vehicular Technology Conference, VTC Spring 2018, Porto, Portugal, June 3-6, 2018
Evaluation of GNSS-based Time Synchronisation for ToF Localisation with Software-Defined Radio
Performance Evaluation for Energy-Harvesting Machine-Type Communication in LTE-A System
On the Efficient Implementation of the Multiband Joint Detection Framework for Wideband Spectrum Sensing in Cognitive Radio Networks
Performance Analysis of Physical Layer Security over Rician/Nakagami-m Fading Channels
Sensing-aided Multi-modal Channel Prediction in 6G mmWave Massive MIMO Systems
Novel Approaches for Performance Enhancement of High Rate-Spatial Modulation System
Constellation Design for Quadrature Spatial Modulation
Primary User Activity Based Channel Allocation in Cognitive Radio Networks
V2X Protocols for Low-Penetration-Rate and Cooperative Traffic Estimations
Cooperative Sensing for STAR-RIS Aided Integrated Sensing and Communication Network
Distribution of Microcells for Cellular Mobile Networks
A new channel assignment by controlling the transmitted power level based on the distance between the cell site and the mobile unit
Automated Data Format Identification and Processing for Security Analysis
An Efficient User Selection Technique for Full-Duplex MU-MISO Systems
SemBAT: Physical Layer Black-box Adversarial Attacks for Deep Learning-based Semantic Communication Systems
Joint Cell-Site Selection and Power Control for Cognitive Radios with Outage Probability Requirement
A Novel Retransmission Scheme for Hierarchical Modulation Based MBMS
Multi-Cell Interference Cancellation for TD-SCDMA Compatible Mobile Satellite System
Multiobjective QoS-Oriented Planning for Indoor Wireless LANs
Reinforcement Learning as a Pre-Diagnostic Tool for TCP/IP Protocols on In-Car Networks
Proactive Delay-Minimizing Scheduling for 5G Ultra Dense Deployments
Similitude: Interfacing a Traffic Simulator and Network Simulator with Emulated Android Clients
Performance of multirate techniques in W-CDMA
Priority-Based Congestion Control Algorithm for Cross-Traffic Assistance on LTE Networks
2 X 2 MIMO Measurements of the Wideband Car-to-Car Channel at 5.7 GHz on Urban Street Intersections
Downlink NOMA in Multi-UAV Networks over Bivariate Rician Shadowed Fading Channels
Circle Track Antenna-Assisted Beamforming for Multiuser MIMO Communication Systems
PC-Signal-Based PAPR Reduction Using Null Space in MIMO Channel for MIMO-OFDM Signals in Frequency-Selective Fading Channel
Serial concatenated trellis coded modulation with inner rate-1 accumulate code
Edge Computing QoE Maximization in EV Parking Scenario
An Efficient Oblique Projection Algorithm for V-BLAST Detection with Novel Ordering
Multiple Access Offloading Design for Optimizing Weighted PAoI-Energy in Mobile Edge Computing Systems
Artificial-Noise-Resistant Eavesdropping in MISO Wiretap Channels: Receiver Construction and Performance Analysis
On PAPR Reduction and Transmit Distortion Compensation in Massive MIMO OFDM Systems
Energy Analysis of Device Discovery for Bluetooth Low Energy
Search-Tree Based Uplink Channel Aware Packet Scheduling for UTRAN LTE
High-Efficient InterActive Pair Scheduling (IAPS) Scheme for IEEE 802.11 Infrastructure WLAN
Effect of Bandwidth and Antenna Directivity on the Range Estimation Accuracy in a Multipath Environment
Real-Time Multicasting Protocol in Wireless Sensor Networks
An mmWave Wireless Communication and Radar Detection Integrated Network for Railways
Radio-Based Traffic Flow Detection and Vehicle Classification for Future Smart Cities
Performance Analysis of Fiber-Optic Inband Relaying against Both Self- and Inter-Cell Interference
LSHA: A Lightweight and Secure Handover Authentication Scheme Based on Wireless Key for 5G-V2X
System Design for Multiple Users Cooperative Communication in LTE
Energy-efficient Obstacle-avoidance Multiple MCVs-facilitated Directional Wireless Charging for IoT
The Impact of Loopback Channel Estimation Error on Performance of Full-Duplex Two-Way AF Relaying Communication Systems
D2D Neighbor Discovery and Resource Scheduling through Demodulation Reference Signal
Cross Correlation Characteristics of Large Scale Parameters in Urban Macro Cell
Capacity of the Distributed Antenna Systems over Shadowed Fading Channels
Multiple Access Technique for IoT Networks Serving Prioritized Emergency Applications
Fairness-Aware Game Theoretic Approach for Service Management in Vehicular Clouds
C/U Split Multi-Connectivity in the Next Generation New Radio System
Vehicle Trajectory Estimation based on Dynamic Bayesian Networks
Differential Power Attack Analysis on Novel ZUC-PRN Using VAMAN-BB4 Board
Improved MMSE Vector Precoding Based on the MBER Criterion
Precoder Design for DSTM based on Statistical Information the Fading Cannels
A Proximity Sensor Based No-Touch Mechanism for Mobile Applications on Smart Phones
Cooperative Relay Transmission with Relay's Private Information
Network Selection in Heterogeneous Vehicular Network: A One-to-Many Matching Approach
99th IEEE Vehicular Technology Conference, VTC Spring 2024, Singapore, June 24-27, 2024
Single-Snapshot SLAM in Wireless Communication with Single-Antenna Transceivers
FH-GSM frequency hopping GSM
Space-Time Trellis Coding Exploiting Superimposed Transmissions in Half-Duplex Relay Networks
A Vehicle-Infrastructure Cooperative LiDAR Object Detection Model Aided by Semantic Communication
Detection Schemes for Integrated SWIPT Receivers with Non-Linear Energy Harvesting
Linear Regression-Based Channel Estimation for Non-Gaussian Noise
Hybrid ARQ protocols using space-time codes
UAV Trajectory Design for Obstacle Avoidance Based on Cell-Varying JPS in Smart Cities
MAP-PSP for Space-Time Trellis Codes Over Unknown Doppler Channels
Definition and drivation of level crossing rate and average fade duration in an interference-limited environment
Intelligent Reflecting Surface Aided Mobile Edge Computing with Rate-Splitting Multiple Access
On the Application of Machine Learning for Cut-in Maneuver Recognition in Platooning Scenarios
A High-Resolution Range Profile Estimation Method Based on Ofdm Communication Signals
A Collision Avoidance Mechanism for Emergency Message Broadcast in Urban VANET
Flow-Level Capacity and Performance in HetNets
Design of Quality-of-Experience Criteria for Resource Allocation Toward 6G Wireless Networks: A Review and New Directions
Highly Efficient Simulation Approach for the Network Planning of HSUPA in UMTS
Secrecy Performance of RIS Aided NOMA Networks
Relayed Collective Perception Service With Redundancy Mitigation and Time Synchronization for V2X Communications Networks
Iterative Dual Diagonal LMMSE Channel Estimation in OFDM Systems
Active Power Splitter Gain and Bandwidth Optimization for a 60 GHz Hybrid MIMO System
Metamorphic Testing for Edge Real-Time Face Recognition and Intrusion Detection Solution
Energy-aware Age of Information (AoI) Minimization for Internet of Things in NOMA-based LEO Satellite Networks
Reliable Multicast Mechanism in WLAN with Extended Implicit MAC Acknowledgment
A Handoff Decision Algorithm in Heterogeneous Wireless Networks with Parallel Transmission Capability
Investigation of Non-Orthogonal Multiple Access Techniques for Future Cellular Networks
Spectrum Allocation in Two-Tier Heterogeneous Network: A Bilateral Negotiation Framework
Distributed Power Control for Cognitive Radios with Primary Protection via Spectrum Sensing
Multi-Resolution Beamforming and User Clustering in Downlink Massive MIMO Non-Orthogonal Multiple Access System
Over-the-Air Verification of Angle-of-Arrival Estimation in Millimeter-Wave Channel Sounders
Independent-tree ad hoc multicast routing (ITAMAR)
Robust Beamforming Design for MISO Secrecy Multicasting Systems with Energy Harvesting
Access control of data in integrated voice/data/video CDMA systems
Coverage Performance of Aerial-Terrestrial HetNets
A Study of Long Distance Traffic Using the AODV Protocol in a Vehicular Ad Hoc Network
Measurement-Based Characterizations of On-Body Channel in the Human Walking Scenario
A Simplified LLR-Based Detector for Signals in Class-A Noise
Uplink Performance of Dynamic Interference Coordination under Fractional Power Control for LTE-Advanced Femtocells
Dynamic Channel Access and Power Control via Deep Reinforcement Learning
Secure Communication Based on Reconfigurable Intelligent Surface in Satellite Communications with Similar Channels
Ranging Implementation Using Finite-Resolution Digital Receiver for IEEE 802.15.4a Systems
MOT: A Compatible Transport Mechanism of Mobile Edge Computing and Conventional Traffic
A Relay Selection Scheme to Prolong Connection Time for Public Safety Communications
Affine Precoding Based A-Optimal Pilot Design for Channel Estimation in Single/Multicarrier (SC/MC) Block Transmission Systems
Improved Deep Learning in OFDM Systems With Imperfect Timing Synchronization
Influence of the receiver near range in urban and forested areas in land mobile radio systems
LRRA: Location-Related Rate Adaptation Algorithm in IEEE 802.11p for DSRC Technology in VANET
On Coding of Scheduling Information in OFDM
Providing wireless Internet access in a TDMA/TDD wireless LAN through a new wireless packet fair queueing scheme
Analysis of Multiband Sensing-Time Joint Detection Framework for Cognitive Radio Systems
Towards scalable zero-shot modulation recognition
On the Stationarity of Sum-of-Cisoids-Based Mobile Fading Channel Simulators
Forecasting Wireless Demand with Extreme Values using Feature Embedding in Gaussian Processes
Analysis and Design of Ultra-Reliable Short Blocklength Analog Fountain Codes
SOSAP: A Pareto-Efficient Spectrum Access Protocol for Cognitive Radio Networks
A Robust Frequency MMSE Estimator Based on the Weighted Average of Multipath Signal for OTFS Systems
MS-Assisted Receiver-Receiver Time Synchronization Strategy for Femtocells
How to Select the OOK Detection Threshold in Wireless Ad Hoc and Sensor Networks
Distributed Joint Transmitter-Receiver Beamforming and Power Allocation in MIMO Interference Channel with Interference Alignment
Energy Efficiency Maximization in Green Energy Aided Heterogeneous Cloud Radio Access Networks
A Stochastic Stackelberg Game Framework for Demand-side Participation in the Reserve Market
About SVD Based MIMO, Imperfect Channel Estimates, and Cross-Talk Interference
Local Connectivity Solution over Bluetooth and Wi-Fi
Fast Link Configuration for mmWave Multiuser MIMO Downlink Using Spatial AoD Angular Supports
Randomized Robot-Assisted Relocation of Sensors for Coverage Repair in Wireless Sensor Networks
Joint AP On/Off and User-Centric Clustering for Energy-Efficient Cell-Free Massive MIMO Systems
A Reputation-Based Cooperative Spectrum Sensing in the Presence of Malicious Byzantine Users
AllTheDocks Road Safety Dataset: A Cyclist's Perspective and Experience
Passive Beamforming Design for Reconfigurable Intelligent Surface-aided OFDM: A Fractional Programming Based Approach
On the Energy Efficiency-Spectral Efficiency Trade-Off of the 2BS-DMIMO System
IEEE 80th Vehicular Technology Conference, VTC Fall 2014, Vancouver, BC, Canada, September 14-17, 2014
Performance Analysis of Beam Sweeping in Millimeter Wave Assuming Noise and Imperfect Antenna Patterns
Age of Information in an URLLC-enabled Decode-and-Forward Wireless Communication System
Full Duplex Media Access Control for Wireless Multi-Hop Networks
A Collaborative Intrusion Detection Framework using Federated Learning and Random Neural Network
Message Passing-Initialized Approximated-Variance Expectation Propagation (MPI-AVEP) Detector for AFDM Waveform
Real-Time Collaborative Edge Ai Inference: Joint Dnn Splitting and Batch Optimization
TCP Performance Evaluation over GEO and LEO Satellite Links between Performance Enhancement Proxies
Spatial Uplink Power Control for Massive MIMO
Load Estimation in a Two-Priority mMTC Random Access Channel
A Novel Sparse Channel Estimation Method for Multipath MIMO-OFDM Systems
Towards Seamless Producer Mobility in Information Centric Vehicular Networks
On Optimal Packet Routing in Deterministic DTNs
Performance analysis of multi-branch switched diversity systems
The Role of Inter-Frequency Measurement in Offloading Traffic to Small Cells
MIMO radio channel measurements: performance comparison of antenna configurations
Mobile Energy Resource Allocation for Distribution System Resilience Against Earthquakes
Subspace-Based Semi-Blind Channel Estimation for User-Centric Cell-Free Massive MIMO Systems
Estimation of Base Stations Exclusion Zones
Practical Adaptive Transmission with Respect to Rational Decision Theory
Efficient packet transmission scheme using minipackets in wireless networks
A Novel Energy-Efficient Resource Allocation Approach in Limited Fronthaul Virtualized C-RANs
An Effective Algorithm for Interest Aware Opportunistic Advertising by Mining Social and Consuming Information
Induced Cooperative Multi-user Diversity Relaying for Multi-hop Cellular Networks
Throughput of CDMA Data Networks With Reduced-Rank MMSE Receivers and Automatic Retransmission Request
A New Genetics-Aided Message Passing Decoding Algorithm for LDPC Codes
A Novel Vehicle Detection Method Based on Geomagnetism and UWB Ranging
A Novel Geometric Solution for Moving Target Localization Through Multistatic Sensing in the ISAC System
Energy-Efficient Relay Selection with Blockage for LOS Transmissions in Wireless Sensor Networks
Multiuser Scheduling over MIMO Nakagami-m Fading Channels: Capacity and BER Performance
Mitigating Location Error Using Residual Method for Hyperbolic Positioning Technique Based on Stationary Signal-Strength-Difference Measurements
Influence of 3-D Spatial Correlation on the Capacity of MIMO Mobile-to-Mobile Channels
Incremental Over-the-Air Update for Software-Defined Vehicles with C-V2X
Bounding the Mobility/Capacity Conversion Efficiency in Multi-Service Wireless Communications Networks
A novel concatenated block coded modulation scheme in Rayleigh fading channel
On Sequence Design for Relay Networks with Multipath
Adaptive Multiuser Turbo Asynchronous Receiver for Oversaturated MIMO Communication System
The performance improvement principles of TCP protocol stack on packet switching high speed wireless DS-CDMA links
Location-Assisted Intercell Interference Management Scheme in Next Generation Wireless Networks Using Opportunistic Beamforming
Coverage Hole Elimination System in Industrial Environment
Wireless Sensor Nodes Dimensioning under Network Lifetime Constraint
MMSE-Based Precoder Design in Nonregenerative Relay Systems with Direct Link
Design of a Lane Marker Lighting System Based on Piezoelectric Power Generation
Downlink Performance Analysis of LTE and WiFi Coexistence in Unlicensed Bands with a Simple Listen-Before-Talk Scheme
Performance Analysis of Contention Based Services with Bulk Transmission in IEEE 802.16 OFDMA Networks
UAV-Assisted 5G Networks: Mobility-Aware 3D Trajectory Optimization and Resource Allocation for Dynamic Environments
Coverage and Rate Performance for Distributed Multi-RIS-Assisted mmWave Communications
AirFogSim: A High-Fidelity Simulation Platform for AI Benchmarking in Low-Altitude Scenarios
Predicting Parking Lot Occupancy in Vehicular Ad Hoc Networks
Outage Capacity of a Hybrid MIMO Algorithm That Employs Multiple QR Decompositions
Customer Satisfaction based Resource Allocation for OFDM System with Multimedia Traffic
An Efficient Message Passing Algorithm for Active User Detection and Channel Estimation in NOMA
UHF and SHF Fading Analysis Using Wavelets in Tunnel Environments
Resource Allocation for Decode-and-Forward Relay Assisted Networks with Service Differentiation
Efficiency of Distributed Compression and Its Dependence on Sensor Node Deployments
Performance Evaluation of Coordination Function Selection in Multi-AP Coordination for Next-Generation Wireless LANs
Two Novel Handover Algorithms with Load Balancing for Heterogeneous Network
DHT-Based Channel Estimation for MIMO-OFDM Systems
Improving the Capacity of an Existing Cellular Network Using Distributed Antenna Systems and Right-of-Way Cell Sites
A novel method for initial radius selection of sphere decoding
Optimum Design of the Electric Vehicle Traction Motor Using the Hairpin Winding
Incentivizing Private Data Sharing in Vehicular Networks: A Game-Theoretic Approach
Energy-Efficient Relay Deployment in Cellular Systems Using Fractional Frequency Reuse Scheme
Tradeoff of Capacity and Handover Performance in High Speed Railway Wireless Communications
Novel Load Balancing Algorithms Ensuring Uniform Packet Loss Probabilities for WSN
Information Reconciliation Based on Systematic Secure Polar Code for Secret Key Generation
Code phase assignment-a technique for high-capacity indoor mobile DS-CDMA communications
Optimum power allocation and control for OFDM in multiple access channels
Joint Client Association and UAV Scheduling in Cache-Enabled UAV-Assisted Vehicular Networks
Secrecy Outage Probability of Minimum Relay Selection in Multiple Eavesdroppers DF Cognitive Radio Networks
TOA Estimation Enhancement based on Blind Calibration of Synthetic Arrays
Multi-Service Signal Multiplexing and Isolation for Physical-Layer Network Slicing (PNS)
Automatic Incident Detection In VANETs: A Bayesian Approach
Expectation Propagation Based Iterative Multi-User Detection for MIMO-IDMA Systems
Self-Successive Interference Canceller for Uplink OFDMA with Carrier Frequency Offsets
A Collision Resolution Technique for Robust Coexistence of Multiple Bluetooth Piconets
A Call Server Integrated Approach for QoS Provisioning of SIP Multimedia Services in 802.11 Wireless Networks
Adaptive Peak-to-Average Power Reduction Architecture for Multicarrier Signals with Mixed Modulations
Robust Codebook Design Based on Unitary Rotation of Grassmannian Codebook
Port Isolation Method for MIMO Antenna in Small Terminals for Next Generation Mobile Networks
Performance of Network-Centric Clustering for Coordinated Joint Transmission with Irregular Cluster Topology
LTE Fingerprinting Localization with Altitude
Volterra-Based Machine Learning Compensation of Non-Linear Distortions in an Optoelectronic Terahertz Communication System
Downlink Outage Analysis of Integrated Satellite-Terrestrial Relay Network with Relay Selection and Outdated CSI
A Heuristic Scheduling Scheme in Multiuser OFDMA Networks
Moderate Complexity Turbo Decoder for Near-Optimum Decoding of Product Codes
Communications Based Positive Train Control Systems Architecture in the USA
Social-Aware Energy-Efficient Data Dissemination with D2D Communications
Half-Duplex Relay-Help Transmission with Dirty Paper Coding
C2S: An Transformer-Based Framework to Extrapolate Sensing Channel From Communication Channel
Complexity Reduction for Cooperative Positioning in Vehicular Networks
Millimeter-Wave Path Loss at 73 GHz in Indoor and Outdoor Airport Environments
Inter-Cell Interference Coordination for a Downlink OFDMA Relay Network with Multicells