yusuke1997/dblp-id-title huggingface dataset:
An Index ICS-LoRa Modulation for IoT Communications to Increase Data Rates
Max-Min Beamforming Design for Heterogeneous Networks With Hardware Impairments
Summarizing Data Center Network Traffic by Partitioned Conservative Update
Cooperative Cache in Cognitive Radio Networks: A Heterogeneous Multi-Agent Learning Approach
Energy Efficient Subchannel and Power Allocation in Cooperative VLC Systems
Hybrid splitting algorithm for wireless MAC
High Bit Rate Pulse Position Modulation Signal Generation Based on Rare-Earth-Doped Crystals
Low-Complexity CS-Aided MPA Detector for SCMA Systems
Joint Optimization of Analog Beam and User Scheduling for Millimeter Wave Communications
Modeling 802.11 mesh networks
Movable Antenna Enhanced NOMA Short-Packet Transmission
Energy-Efficient UAV Relaying Communications to Serve Ground Nodes
A Non-Data-Aided Feedforward Timing Estimator Based on Multiple Cyclic Correlations for Short-Term Burst Signals
Cross-Band Optical/RF Networks With Zero-Energy Devices
Resource Allocation in Cognitive Underlay System With Uncertain Interference Channel's Statistics
A Satellite Handover Strategy Based on MIMO Technology in LEO Satellite Networks
A Novel NTRU-Based Handover Authentication Scheme for Wireless Networks
Enhanced Collision Avoidance for Distributed LTE Vehicle to Vehicle Broadcast Communications
Residual Doppler Effect Analysis of the FBMC/OQAM Communication System in Underwater Acoustic Channel
Blind Modulation Classification Under Uncertain Noise Conditions: A Multitask Learning Approach
Network-Coded Cooperation With Outdated CSI
Intra-superframe power management for IEEE 802.15.3 WPAN
Efficient Broadcast for Timely Updates in Mobile Networks
Unsupervised Learning for Cellular Power Control
Design of N-Continuous OFDM With Conventional Reception
Symbol Error Probability of Hexagonal QAM
Delta compression with fixed-length substring coding for fast content download
DS-NLCsiNet: Exploiting Non-Local Neural Networks for Massive MIMO CSI Feedback
A subspace detection method of analog space-time codes for multiantenna ultra-wideband transmissions
Cognitive Radio Spectrum Sensing on the Edge: A Quantization-Aware Deep Learning Approach
UAV Trajectory Optimization for Spectrum Cartography: A PPO Approach
Reduction of PAPR without Side Information for Frequency Switched Transmit Diversity-Based MIMO-OFDM Systems
DFrFT-Based Near-Field Channel Estimation for Extremely Large-Scale MIMO Systems
Projection-Based List Detection in Generalized Spatial Modulation MIMO Systems
Comparison of two SNR-based feedback schemes in multiuser dual-hop amplify-and-forward relaying networks
An Online Algorithm for Computation Offloading in Non-Stationary Environments
Energy Efficient Coverage Extension Relay Node Placement in LTE-A Networks
Analog Full-Duplex Amplify-and-Forward Relay for Power Line Communication Networks
Effective Self Adaptive Multiple Source Localization Technique by Primal Dual Interior Point Method in Binary Sensor Networks
A Novel Reconfigurable Mapping of Physical-Layer Network Coding With M-QAM
On SOVA for nonbinary codes
Multi-Agent Deep Reinforcement Learning Based Handover Strategy for LEO Satellite Networks
SybilVote: Formulas to Quantify the Success Probability of Sybil Attack in Online Social Network Voting
MIMO Decode-and-Forward Relay Systems With an Energy-Constrained Antenna-Switching Relay
Optimal Locally Repairable Codes With Multiple Erasure Tolerance
The structural property of network bottlenecks in maxmin fair flow control
Principal ratio combining for fixed wireless applications when transmitter diversity is employed
Full label space reduction in MPLS networks: asymmetric merged tunneling
Far- and Near-Field Channel Measurements and Characterization in the Terahertz Band Using a Virtual Antenna Array
A Collaborative RC QC-LDPC Code Construction Scheme Using Both Extension and Splitting
General Sub-Packetized Access-Optimal Regenerating Codes
Secure Beamforming in Wireless-Powered Cooperative Cognitive Radio Networks
Named Content Searching in Opportunistic Mobile Networks
Optimal and Efficient Algorithms for Projection-Based Compressive Data Gathering
Estimation of typical sum of lognormal random variables using log shifted gamma approximation
Bayesian Matching Pursuit-Based Channel Estimation for Millimeter Wave Communication
Source Number Estimation via Machine Learning Based on Eigenvalue Preprocessing
Analysis of Optimal Range Sensor Placement for Tracking a Moving Target
Performance Evaluation of HARQ-Assisted Hybrid Satellite-Terrestrial Relay Networks
A Precoding-Based Compute-and-Forward
On the Global and Local Decoding of q-Ary SC-LDPC Codes With Moderate Coupling Length
Fuzzy Hypothesis Testing for Cooperative Sequential Spectrum Sensing Under Noise Uncertainty
On syndrome decoding for Slepian-Wolf coding based on convolutional and turbo codes
Hybrid Precoding for mmWave Massive MIMO With One-Bit DAC
Half-Marker Codes for Deletion Channels With Applications in DNA Storage
Uplink Load Based Scheduling for CDMA Systems
Buffer Sizing for TCP Flows in 802.11e WLANs
Streaming video packet scheduling by Geo Y /G/∞ input process modeling
On the Complexity of System Throughput Derivation for Static 802.11 Networks
A Distributed Device Selection Method to Minimize AoI in RF-Charging Networks
Distributed Joint Source and Channel Coding with Low-Density Parity-Check Codes
AAIC: Adaptive-Sliding-Connection-Window Solution to TCP Incast from Application Layer
Ergodic Rate Analysis of STAR-RIS Aided NOMA Systems
An analytical model for performance evaluation of parallel interference cancellers in CDMA systems
Chaos theory based detection against network mimicking DDoS attacks
Latency-Bounded Reliability-Oriented Degree Distribution of Rateless Codes: A Knowledge-Assisted Reinforcement Learning Method
Joint pilot tone and channel estimator design for OFDM systems
Novel Distributed Space-Time Trellis Codes for Relay Systems over Cascaded Rayleigh Fading
Low-Complexity Robust Beamforming Design for IRS-Aided MISO Systems With Imperfect Channels
Necessary Condition-Based Detector for Generalized Space Shift Keying MIMO Systems
Low-Delay Joint Source-Channel Mappings for the Gaussian MAC
Access Delay Optimization of Double-Contention Random Access Scheme in Machine-to-Machine Communications
Aerial Reconfigurable Intelligent Surface-Assisted Secrecy: A Learning Approach
Communications Channel Characteristics Due to Aircraft Body Blockage in Urban Air Mobility
Modeling TCP Veno Throughput over Wired/Wireless Networks
A decoding method for multilayer codes
Packet Error Probability in Multi-Path Diversity Scheme with Majority Combining
Extensive Cooperative Caching in D2D Integrated Cellular Networks
A Semi-Analytical Method for Periodic Earth Coverage Satellites Optimization
Space-Time Uplink Transmission in Non-Coherent Systems With Receiver Having Massive Antennas
Blind Equalization for Chaotic Signals Based on Echo State Network and Kalman Filter Under Nonlinear Channels
Learning-Aided UAV-Cooperation Reduces the Age-of-Information in Wireless Networks
Spatial-Temporal Network Coding Based on BATS Code
Linear prediction receiver for differential space-time block codes with spatial correlation
Frequency-offset synchronization and channel estimation for OFDM-based transmission
On the Optimal Tone Spacing for Interference Mitigation in OFDM-IM Systems
Energy Efficiency-Delay Tradeoff in Energy-Harvesting-Based D2D Communication: An Experimental Learning Approach
Downlink SINR Distribution of Linearly Precoded Multiuser MIMO Systems
User-Centric Precoding Designs for the Non-Regenerative MIMO Two-Way Relay Systems
Early Warning of mmWave Signal Blockage and AoA Transition Using sub-6 GHz Observations
On optimum transmission power strategy in MIMO systems with covariance feedback
On Design and Implementation of Reinforcement Learning Based Cognitive Routing for Autonomous Networks
Enhanced Message-Passing Decoding of Degenerate Quantum Codes Utilizing Trapping Set Dynamics
Maximin SNR Beamforming Strategies for Two-Way Relay Channels
A Tight Bound on BER of MCIK-OFDM With Greedy Detection and Imperfect CSI
PAPR Reduction in SC-FDMA by Pulse Shaping Using Parametric Linear Combination Pulses
Improved Tensor-MODE Based Direction-of-Arrival Estimation for Massive MIMO Systems
Design and Implementation of an Ethernet-VLC Interface for Broadcast Transmissions
On Progressive Edge-Growth Interleavers for Turbo Codes
On the impact of antenna correlation in multi-user MIMO systems with rate constraints
Exploiting the Fast Spectral Roll-Off of CPM Sidelobes to Improve Bandwidth Efficiency in Satellite Communications
Range-Angle Decoupling and Estimation for FDA Radar With Non-Uniform Frequency Offset
Parity bit selected spreading sequences: a block coding approach to spread spectrum
Modified SC Decoding for BDPSK Modulated Polar Codes
Binary LCD Codes and Self-Orthogonal Codes via Simplicial Complexes
On the energy impact of four information delivery methods in wireless sensor networks
Channel Estimation for STAR-RIS-Aided Wireless Communication
A Non-Data-Aided Rapid Synchronization Method for UWB Impulse Radio
Transient Analysis of the Set-Membership LMS Algorithm
Low Complexity Optimal Soft-Input Soft-Output Demodulation of MSK Based on Factor Graph
Energy-Efficient THz NOMA for SWIPT-Aided Miniature UAV Networks
Auction-Based Design and Analysis of Wireless Power Transfer Network With Critical Users
A Simple Priority Mechanism for Shared-Protection Schemes
Energy-Efficient RSSI-Based Localization for Wireless Sensor Networks
Design of I-Polar Codes
Performance of PPM on terrestrial FSO links with turbulence and pointing errors
Wireless Energy Harvesting in Two-Way Network Coded Cooperative Communications: A Stochastic Approach for Large Scale Networks
Sidelobe suppression in NC-OFDM systems using constellation adjustment
Estimating MIMO system performance using the correlation matrix approach
Future Internet of Things Architecture: Like Mankind Neural System or Social Organization Framework?
Joint Relay Assignment and Power Allocation for Multicast Cooperative Networks
A Near-Optimal Detection Scheme Based on Joint Steepest Descent and Jacobi Method for Uplink Massive MIMO Systems
Parallel decoding of turbo codes using soft output T-algorithms
On the Outage Performance of JT-CoMP-CNOMA Networks With SWIPT
Performance of wideband CDMA systems supporting multimedia traffic
An Efficient Method for Evaluating Information Outage Probability and Ergodic Capacity of OSTBC System
Performance Analysis of Hybrid Carrier System with MMSE Equalization over Doubly-Dispersive Channels
Upper Bound Analysis of the Handover Performance in HetNets
ARNC Multicasting of HDCP Data for Cooperative Mobile Devices With Dual Interfaces
On the Asymptotic Bit Error Probability of M-QAM for MIMO Y Channels
On the Use of Photon Arrival-Times for Non-Line-of-Sight Solar-Blind UV Channels
Rate-Compatible Short-Length Protograph LDPC Codes
Weighted Sum Power Minimization for Cooperative Spectrum Sharing in Cognitive Radio Networks
Lowest Density MDS Array Codes of Distance 3
BER Analysis of Three-Phase XOR-and-Forward Relaying Using Alamouti STBC
Taming the Tail of Maximal Information Age in Wireless Industrial Networks
Adaptive Group Shuffled Decoding for LDPC Codes
Neighbor caching in multi-hop wireless ad hoc networks
Single ODSB Radio-Over-Fiber Signal Supports STBC at Each RAP
Processing Delays Do Not Degrade Network Error-Correction Capacity in Directed Networks
Closed-form BER analysis for antenna selection using orthogonal space-time block codes
Adaptive beamforming algorithm based on eigen-space method for smart antennas
Two-Stage Based Partial Online Optimization Channel Prediction for Massive MIMO in High-Mobility
Analysis and Optimization of Age of Information for Area Sensing
FOTG: fault-oriented stress testing of IP multicast
Improving Multicast Networks Throughput via Joint Multicast Beamforming and Rate Aware Instantly Decodable Network Coding
Low PAPR OFDM-Based DCSK Design With Carrier Interferometry Spreading Codes
Improving Routing Table Lookup in Software Routers
A 1-D Search Approach for Single Sensor Passive Localization Based on Signal Periodicity
Semantic-Aware Transmission Scheduling: A Monotonicity-Driven Deep Reinforcement Learning Approach
Joint Subcarrier and Power Allocation for Integrated OFDM Waveform in RadCom Systems
Comments on "Comments on the peak factor of sampled and continuous signals"
Adaptive Minimum Entropy Equalization Algorithm
Candidate Paths for Impairment-Aware PCE in 10-100 Gb/s Optical Networks
An OTFS-DFRC Waveform Design Method Based on Phase Perturbation
Secure Network Coding in DTNs
Probability of Error for Optimal Codes in a Reconfigurable Intelligent Surface Aided URLLC System
Joint Power-Domain and SCMA-Based NOMA System for Downlink in 5G and Beyond
Adaptive processing gain CDMA networks over Poisson traffic channel
Feature Contrastive Transfer Learning for Few-Shot Long-Tail Sonar Image Classification
Link Adaptation for Energy-Efficient Transmission with Receiver CSI
Distributed Arithmetic Coding
On the Impacts of Composite Fading on Large-Scale Multi-User MIMO Systems
Predictive Prefetching Based on User Interaction for Web Applications
Adaptive transmission mode selection scheme for distributed wireless communication systems
Distributed Uplink Rate-Splitting Multiple Access for Multi-Access Edge Computing
Orthogonal Multiplexing in a Subspace of Frequency Well-Localized Signals
Group Based Interference Alignment
Non-linear optimization for multi-path source routing in obs networks
Secret-Key Agreement With Public Discussion Subject to an Amplitude Constraint
Expanding-Window BATS Code With Intermediate Feedback
Security analysis and improvement of a gateway-oriented password-based authenticated key exchange protocol
ZCLoRa: A Lightweight Deep Learning Based Receiver for Enhanced LoRa Decoding
Variable Length Differential Encoding for Real-Time Status Updates
Inter-Frame Polar Coding With Dynamic Frozen Bits
Turbo codes for nonuniform memoryless sources over noisy channels
A simplified computational kernel for trellis-based decoding
On the Diversity-Multiplexing Tradeoff of an Improved Amplify-and-Forward Relaying Strategy
Glucose Regulation Through Cooperative Molecular Communication
Optimized distributed MIMO for cooperative relay networks
Physical-Layer Security of a Buffer-Aided Full-Duplex Relaying System
An Infrastructure-less Framework for Preventing Rear-End Collisions by Vehicular Sensor Networks
Superposition-based adaptive modulated space time block coding for MIMO-OFDM systems
Cooperative Resource Allocation for Guaranteeing Intercell Fairness in Femtocell Networks
A Node-Selection-Based Sub-Task Assignment Method for Coded Edge Computing
An Iterative Dictionary Learning-Based Algorithm for DOA Estimation
Virtual Array Response Vector for Angle Estimation of MIMO Radar With a Wide-Band Interleaved OFDM Signal
Subchip multipath delay estimation for downlink WCDMA system based on Teager-Kaiser operator
Pinching-Antenna Systems (PASS) Aided Over-the-Air Computation
EM/SAGE Based ML Channel Estimation for Uplink DS-CDMA Systems over Time-Varying Fading Channels
Modeling conditional FER for hybrid ARQ
Subcarrier Ordering for OFDM Packet Radio Systems
An Online Learning Method to Maximize Energy Efficiency of Cognitive Sensor Networks
A sybil-proof referral system based on multiplicative reputation chains
Subset-Optimized Polarization-Multiplexed PSK for Fiber-Optic Communications
On Capacity and Fairness of Quality-Based Channel-State Reporting with Different Thresholds in Non-Identical Rayleigh Fading Channels
Simple maximum-likelihood decoding of generalized first-order Reed-Muller codes
Double Threshold Authentication Using Body Area Radio Channel Characteristics
Switch-Centric Byzantine Fault Tolerance Mechanism in Distributed Software Defined Networks
Secrecy-Aware Altitude Optimization for Quasi-Static UAV Base Station Without Eavesdropper Location Information
Packet Error Probability in a Three-Branch Diversity System with Majority Combining
Network Optimization Problems Subject to Max-Min Fair Flow Allocation
Deep Learning-Based Sparse Recovery and Dictionary Matching for Multipath Time Delay Estimation
Hybrid Near-Field and Far-Field XL-MIMO: How Many Users Can Be Supported?
Data Dissemination in Wireless Networks with Network Coding
UVoD: An unified architecture for video-on-demand services
Artificial Noise Assisted Secure Massive MIMO Transmission Exploiting Statistical CSI
Relay Placement for Physical Layer Security: A Secure Connection Perspective
Beyond Traditional Beamforming: Singular Vector Projection for MU-MIMO
Wireless Scheduling for Heterogeneous Services With Mixed Numerology in 5G Wireless Networks
Successive Relaying for Two-Hop Two-Destination Multicarrier Relay Channels
Trusted Reconfigurable Intelligent Surface for Multi-User Quantum Key Distribution
A Closed-Form Minimum BER Precoder for Orthogonal Time Frequency Space Systems
On the Inherent Security of Linear Network Coding
Visible Light Communications for Unmanned Aerial Vehicle: Channel Modeling and Experimental Validation
Secure OTFS Transmission: A Theoretical Framework Based on Discriminatory Channel Estimation
On throughput stabilization of network transport
Opportunistic MIMO Two-Way Relaying: Diversity-Multiplexing Tradeoff Analysis
Performance of a Non-Orthogonal Multiple Access System With Full-Duplex Relaying
Genetic Algorithm Aided OFDM With All Index Modulation
VoxelRF: Voxelized Radiance Field for Fast Wireless Channel Modeling
Reverse acknowledgment (ra) scheme: fast detection of retransmission failures for SR-ARQ
Time-Spectrum Consecutiveness Based Scheduling With Advance Reservation in Elastic Optical Networks
Near/Far-Field State Detection for 6G Terahertz Communications Systems
Serial Multicode Direct Sequence Spread Spectrum With Applications to Satellite Navigation Pilot Channels
Multi-Strata Space-Time Coded Spatial Modulation
A novel performance analysis model for an IEEE 802.11 wireless LAN
A Novel Block Sparse Reconstruction Method for DOA Estimation With Unknown Mutual Coupling
Energy Efficiency of Hybrid Cellular With Heterogeneous QoS Provisions
A Power Amplifier Energy Efficient Polarization Modulation Scheme Based on the Optimal Pre-Compensation
Energy Efficient OFDM With Intelligent PAPR-Aware Adaptive Modulation
Strategic Backoff of Slotted ALOHA for Minimal Age of Information
Lattice-Reduction-Aided Breadth-First Tree Searching Algorithm for MIMO Detection
On Probabilistic Weight Distribution of Polar Codes
Energy-Efficiency Gains of Caching for Interference Channels
Active Interference Cancellation for OFDM Spectrum Sculpting: Linear Processing Is Optimal
Low Complexity MMSE-SIC Receiver for OTFS in High-Speed Mobile Scenarios
CAC with Nonlinearly-Constrained Feasibility Regions
Coverage Probability Analysis of Heterogeneous Cellular Networks in Rician/Rayleigh Fading Environments
Distribution of Diagonal Elements of a General Central Complex Wishart Matrix
R-CRDSA: Reservation-Contention Resolution Diversity Slotted ALOHA for Satellite Networks
Multi-Stage Receiver of MIL-STD-188-110D Waveform 0 for High-Frequency Communications
Low-Complexity Detector for Spatial Modulation Multiple Access Channels With a Large Number of Receive Antennas
Symbol Error Performance Analysis of OFDM Relaying System with Subcarrier Mapping Scheme
Blind Detection and Identification of Polar Codes Based on the Parity Check Conformity
Asynchronous NOMA for Downlink Transmissions
Tripartite Matching Game Model in UAV-Assisted Covert Communication Network
A bandwidth-power efficient modulation scheme based on quaternary quasi-orthogonal sequences
Accelerated Federated Learning via Greedy Aggregation
Non-full rank space-time trellis codes for serially concatenated system
Time-Division Cellular Networks With Full-Duplex Base Stations
A Defensive Scheduling Scheme to Accommodate Random Selection Devices in 5G NR V2X
Optimal transmit strategy of a two-hop decode-and-forward MIMO relay system with mean and covariance feedback
Impact of Cochannel Interference on the Performance of Quadrature Spatial Modulation MIMO Systems
On an Uplink Space Division Multiple Access Technique Based on the Doppler Effect
Fluid Antenna System Enhancing Orthogonal and Non-Orthogonal Multiple Access
Power Allocation and Dimensioning for Interweaved Primary and Secondary Multicast Networks With Outage Constraints
Ultra-Reliable and Low Latency Communication in mmWave-Enabled Massive MIMO Networks
TR Pre-Filter Design for Channel Shortening in MISO-OFDM Systems
Error Floor Analysis of Coded Slotted ALOHA Over Packet Erasure Channels
Improved algorithms for cancellation carrier optimization to suppress the OFDM OOB spectrum
Beyond Integer-Forcing Receiver for Lattice-Code Based Multi-User MIMO System
A Closed-Form Approximate BEP Expression for Cooperative IDMA Systems over Multipath Nakagami- $m$ Fading Channels
Optimal Use of Current and Outdated Channel State Information: Degrees of Freedom of the MISO BC with Mixed CSIT
New binary sequences with good aperiodic autocorrelations obtained by evolutionary algorithm
A Novel MuLoRa Modulation Based on Fractional Fourier Transform
Error analysis for fingerprint-based localization
Source and Relay Precoding for Full-Duplex MIMO Relaying With a SWIPT-Enabled Destination
Information Rates of Energy Harvesting Communications With Intersymbol Interference
Nonuniform Quantized Decoder for Polar Codes With Minimum Distortion Quantizer
Effect of DIS Attack on 6TiSCH Network Formation
On the Adaptive Determination of the Number of Preambles in RACH for MTC
An Enhanced Interference Alignment Strategy With MIL Criterion and RCG Algorithm for IRS-Assisted Multiuser MIMO
Protection, Routing, Modulation, Core, and Spectrum Allocation in SDM Elastic Optical Networks
Downlink MIMO HCNs With Residual Transceiver Hardware Impairments
The Cramer-Rao bounds of hybrid TOA/RSS and TDOA/RSS location estimation schemes
Effect of Channel Estimation Errors on Arbitrary Transmit Antenna Selection for Cognitive MISO Systems
Secrecy Enhancement Analysis Against Unknown Eavesdropping in Spatial Modulation
Anchor Deployment for Belief Propagation-Based Localization: A Topological Method
On the Age of Status Updates in Unreliable Multi-Source M/G/1 Queueing Systems
Power Minimization for RIS-Assisted Uplink MIMO-NOMA Systems Based on HBF
Precoding-Aided Spatial Modulation With Dual-Polarized Antennas Over Correlated Channels
An Optimization Approach for an RLL-Constrained LDPC Coded Recording System Using Deliberate Flipping
Optimal Beam Subset and User Selection for Orthogonal Random Beamforming
A framework for solving logical topology design problems within constrained computation time
The Rank of Random Binary Matrices and Distributed Storage Applications
Power Allocation and Achievable Secrecy Rates in MISOME Wiretap Channels
Efficient Cell-Clustering Algorithm for Inter-Cluster Interference Mitigation in Network MIMO Systems
Free-Space Optical Channel Turbulence Prediction: A Machine Learning Approach
Deep Reinforcement Learning Assisted Multi-Operator Spectrum Sharing in Cell-Free MIMO Networks
Multistatic Radar Placement Optimization for Cooperative Radar-Communication Systems
Multiobjective optimization for pre-DFT combining in coded SIMO-OFDM systems
Processor-based turbo interleaver for multiple third-generation wireless standards
Goal-Oriented UAV Communication Design and Optimization for Target Tracking: A Machine Learning Approach
Deep Learning-Based Detection for Moderate-Density Code Multiple Access in IoT Networks
Energy saving mechanism in the IEEE 802.16e wireless MAN
Linear Code Duality Between Write-Efficient Memories and Lossy Source Coding
Energy-Efficient Rate Allocation for NOMA-MEC Offloading Under Outage Constraints
A "better than" Nyquist pulse
A Novel Interference Alignment Scheme With a Full-Duplex MIMO Relay
Proportional Resource Allocation with Subcarrier Grouping in OFDM Wireless Systems
Average Block Error Rate of Downlink NOMA Short-Packet Communication Systems in Nakagami- $m$ Fading Channels
Localization of Access Points Based on Signal Strength Measured by a Mobile User Node