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(135 results)-
Whitepapers
Optimum Discrete Signaling Over Channels With Arbitrary Noise Distribution
September 19, 2008, 12:00am PDT
General channels with arbitrary noise distributions and a finite set of signaling points are considered in this paper. The authors aim at finding the capacity-achieving input distribution. As a...
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Whitepapers
Fast Resource Allocation for OFDMA Downlink Utilizing an Efficient Discrete Bit Loading
September 4, 2008, 12:00am PDT
In this paper, bit loading for Orthogonal Frequency Division Multiplexing (OFDM) is studied first. The continuous water-filling is modified to take the maximal rate constraint on each subcarrier...
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Whitepapers
Optimal and Efficient Bit Loading for OFDM in the Presence of Channel Uncertainty
August 8, 2008, 12:00am PDT
In practice only imperfect Channel State Information (CSI) is available at the transmitter due to noisy and time-varying channel. In this paper, the authors consider optimal bit loading for...
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Whitepapers
Theoretical Analysis of the Energy Capture in Strictly Bandlimited Ultra-Wideband Channels
August 7, 2008, 12:00am PDT
Ultra-wideband communication offers the attractive possibility to achieve high data rates with low transmission power and is a candidate for the air interface of next generation wireless personal...
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Whitepapers
Cooperative Protocols for Random Access Networks
January 23, 2009, 12:00am PST
Cooperative communications have emerged as a significant concept to improve reliability and throughput in wireless systems. On the other hand, WLANs based on random access mechanism have become...
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Whitepapers
Kernel-Based Learning of Decision Fusion in Wireless Sensor Networks
May 8, 2008, 12:00am PDT
The problem of decision fusion in wireless sensor networks for distributed detection applications has mainly been considered in scenarios where sensor observations are conditionally independent...
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Whitepapers
Capacity of General Discrete Noiseless Channels
June 10, 2010, 12:00am PDT
This paper concerns the capacity of the discrete noiseless channel introduced by Shannon. A sufficient condition is given for the capacity to be well-defined. For a general discrete noiseless...
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Whitepapers
Graphics Hardware Accelerated Field Strength Prediction for Rural and Urban Environments
November 20, 2007, 12:00am PST
Acceleration techniques on graphics hardware for field strength prediction algorithms are presented. The authors identify some basic building blocks of common propagation algorithms and propose...
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Whitepapers
Hardware Acceleration Techniques for 3D Urban Field Strength Prediction
September 4, 2007, 12:00am PDT
Planning and optimization of radio networks are active research areas. Therefore, both fast and accurate radio wave propagations predictions are required. To fulfill those requirements the authors...
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Whitepapers
Reachability of the Capacity in Parallel Quantised Channels
July 5, 2012, 12:00am PDT
Based upon profound knowledge about wireless communication systems that was gathered during the past decades, modelling biological systems analogously has become more and more popular. Although...
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Whitepapers
Distributed Compressed Sensing for the MIMO MAC With Correlated Sources
May 24, 2012, 12:00am PDT
In this paper, the authors consider the transmission of jointly sparse signals over a MIMO MAC composed of two transmitters and one receiver. Distributed compression is performed at the...
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Whitepapers
Detecting Irregularities in Blog Comment Language Affecting POS Tagging Accuracy
June 13, 2012, 12:00am PDT
Studying technology acceptance requires the survey and analysis of user opinions to identify acceptance-relevant factors. In addition to surveys, Web 2.0 poses a huge collection of user comments...
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Whitepapers
Dynamic Cell Association for Downlink Sum Rate Maximization in Multi-Cell Heterogeneous Networks
May 24, 2012, 12:00am PDT
In this paper, the authors consider a heterogeneous network consisting in several macro nodes and pico nodes. The goal is to associate users, belonging to this network, to one of the nodes, while...
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Whitepapers
Field Strength Prediction for Environment Aware MIMO Channel Models
January 16, 2012, 12:00am PST
For planning, analysis, and optimization of modern, self organizing radio networks field strength prediction plays an essential role. A huge number of predictions is needed for planning purposes...
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Whitepapers
Autoregressive Modeling of Frequency Selective Channels for Synchronized OFDM Systems
January 14, 2012, 12:00am PST
In this paper, an Auto-Regressive (AR) channel model for simulating frequency selective channels in synchronized Orthogonal Frequency Division Multiplexing (OFDM) systems is proposed. By frequency...
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Whitepapers
Extended Cyclostationary Signatures for OFDM-Based Cognitive Radio
February 2, 2012, 12:00am PST
Cyclostationary signatures have been shown to be an effective method for OFDM network synchronization and Cognitive Radio coordination. In this paper, an extended method that utilizes...
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Whitepapers
Upper-Bounding Rate Distortion Functions Based on the Minimum Mean-Square Error
March 2, 2012, 12:00am PST
The authors derive a new upper bound on the rate distortion function for arbitrary memoryless sources, which is based on the relation between mutual information and minimum mean-square error...
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Whitepapers
Robust Planning of Green Wireless Networks
November 22, 2011, 12:00am PST
Current methods dealing with the energy efficient wireless network planning problem require a static model. However, bit rate requirements vary and rise over time, users move around and path gain...
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Whitepapers
Short Huffman Codes Producing 1s Half of the Time
July 22, 2011, 12:00am PDT
The design of the channel part of a digital communication system (e.g., error correction, modulation) is heavily based on the assumption that the data to be transmitted forms a fair bit stream....
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Whitepapers
Operating LDPC Codes With Zero Shaping Gap
September 27, 2011, 12:00am PDT
Unequal transition probabilities between input and output symbols, input power constraints, or input symbols of unequal durations can lead to non-uniform capacity achieving input distributions for...
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Whitepapers
Zero-Padded Symmetric Conjugate Technique for Intercarrier Interference Cancellation in MIMO-OFDM Systems
November 11, 2011, 12:00am PST
This paper proposes a zero-padded symmetric conjugate self-cancellation technique in Orthogonal Frequency Division Multiplexing (OFDM) systems by padding zero in between two consecutive symbols...
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Whitepapers
On the Performance of Cooperative Multihop Communications
November 11, 2011, 12:00am PST
Cooperative communications is a promising technology to improve the performance of wireless networks. In this paper, the authors investigate the performance of a multihop communication system with...
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Whitepapers
Joint BS Selection and Subcarrier Assignment for Multicell Heterogeneous OFDM Unicasting
August 31, 2011, 12:00am PDT
In this paper, the resource allocation is studied for Orthogonal Frequency Division Multiplexing (OFDM) unicasting by multiple Base Stations (BSs). In the considered scenario, each user is...
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Whitepapers
Low Complexity Joint Channel Estimation and Decoding for LDPC Coded MIMO-OFDM Systems
October 25, 2010, 12:00am PDT
In this paper, a joint iterative channel estimation and Low-Density Parity-Check (LDPC) decoding algorithm based on factor graphs and the sum-product algorithm is proposed for Orthogonal Frequency...
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Whitepapers
Ontology-Based Corpus Generation for Web Comment Analysis
May 24, 2011, 12:00am PDT
In the study of technology acceptance the survey and analysis of user opinions is crucial to identify acceptance-relevant factors. In addition to topic-related surveys, which require high user...
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Whitepapers
Efficient Implementation and Evaluation of Parallel Radio Wave Propagation
March 27, 2011, 12:00am PDT
For planning, analysis, and optimization of modern, self organizing radio networks field strength prediction plays an essential role. A huge number of predictions is needed for planning purposes...
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Whitepapers
Matching Dyadic Distributions to Channels
February 10, 2011, 12:00am PST
Many communication channels with discrete input have non-uniform capacity achieving Probability Mass Functions (PMF). By parsing a stream of independent and equiprobable bits according to a full...
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Whitepapers
Increasing Signaling Power Not Necessarily Improves Channel Capacity
January 5, 2011, 12:00am PST
This paper is inspired by the general question of how to choose signaling points from a bounded set such that capacity of the corresponding channel is maximized. Since, subject to peak power...
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Whitepapers
Fast Radio Wave Propagation Prediction by Heterogeneous Parallel Architectures With Incoherent Memor
January 14, 2011, 12:00am PST
The present correspondence deals with radio wave propagation for urban scenarios on the cell broadband engine. Binary space partitioning trees are used to split the building data into manageable...
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Whitepapers
Optimization of Cooperative Spectrum Sensing and Implementation on Software Defined Radios
September 22, 2010, 12:00am PDT
Reliable detection of primary user activity by spectrum sensing is a crucial issue of cognitive radio systems. The cooperative spectrum sensing is to combine the detection results of multiple...
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Whitepapers
MIMO Broadcast Channel Rate Region With Linear Precoding at High SNR: No Full Multiplexing Case
October 20, 2010, 12:00am PDT
In this paper, the rate region of the two user MIMO Broadcast Channel (BC) with linear filtering at high Signal-to-Noise Ratio (SNR) is studied when time sharing is not available and the...
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Whitepapers
Throughput, Bit-Cost, Network State Information: Tradeoffs in Cooperative CSMA Protocols
September 7, 2010, 12:00am PDT
In wireless local area networks, spatially varying channel conditions result in a severe performance discrepancy between different nodes in the uplink, depending on their position. Both throughput...
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Whitepapers
Factor Graph Based Detection and Channel Estimation for MIMO-OFDM Systems in Doubly Selective Channel
June 25, 2010, 12:00am PDT
Based on the factor graph, a joint channel estimation and detection method is proposed for Orthogonal Frequency Division Multiplexing (OFDM) systems employing multiple transmit and receive...
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Whitepapers
Generalised Link-Layer Adaptation With Higher-Layer Criteria for Energy-Constrained and Energy-Sufficient Data Terminals
September 28, 2010, 12:00am PDT
It has long been recognised that a wireless communication system can be more efficient if link-layer parameters such as modulation order are adapted to the channel conditions. The most common...
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Whitepapers
A Body-Coupled Communication and Radio Frequency Dual Technology Cooperation Protocol for Body-Area Networks
February 2, 2010, 12:00am PST
Body-Area Networks (BANs) are Wireless Sensor Networks (WSNs) that operate in close proximity to the human body, being used for example for distributed wireless medical body sensors. Current...
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Whitepapers
Performance Evaluation of Sensor Fusion With Side Information
April 24, 2010, 12:00am PDT
The efficient evaluation of fusion algorithms becomes particularly important when different fusion schemes have to be compared with respect to an underlying performance metric. In this paper, the...
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Whitepapers
Generalised Water-Filling: Costly Power Optimally Allocated to Sub-Carriers Under a General Concave Performance Function
March 1, 2010, 12:00am PST
A data terminal seeks the optimal power allocation for M sub-carriers under a general concave performance function ("Capacity"), and a per-Watt price. The value to the terminal of one transferred...
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Whitepapers
Simple Decentralised Market-Oriented Allocation of Sub-Channels and Power for Access-Point to Terminal Multi-Carrier Communication
March 1, 2010, 12:00am PST
Common auction formats are well-understood, relatively simple mechanism which have long been used for allocating an indivisible good to the party that values it the most, for such reasons as speed...
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Whitepapers
Mesh-DHT: A Locality-Based Distributed Look-Up Structure for Wireless Mesh Networks
May 24, 2012, 12:00am PDT
Distributed Hash Tables (DHTs) offer an elegant and fully distributed solution for reliably storing and retrieving data. Wireless Mesh Networks (WMNs) envision a fully decentralized fashion, and...
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Whitepapers
On the Performance of Cellular Network Deployments in TV Whitespaces
May 24, 2012, 12:00am PDT
In this paper, the authors analyze the prospects of deploying a cellular network in the TV whitespaces. They study the challenges of planning for a large-scale transmitter network that is...
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Whitepapers
Energy Efficiency of Network-Based Acoustic Echo Control in Mobile Radio
September 28, 2012, 12:00am PDT
In this paper, the authors investigate the energy efficiency of network-based Acoustic Echo Control (AEC). Usually, AEC is implemented in the mobile terminal. Due to the limited resources of the...
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Whitepapers
Considering Microelectronic Trends in Advanced Wireless System Design
April 1, 2010, 12:00am PDT
Wireless communication system design has been a booming topic since the shift into the digital era in the 1990s. In the same period of time, microelectronic technologies have reached new paradigm...
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Whitepapers
The K - Constrained Bipartite Matching Problem: Approximation Algorithms and Applications to Wireless Networks
December 21, 2009, 12:00am PST
In communication networks, resource assignment problems appear in several different settings. These problems are often modeled by a maximum weight matching problem in bipartite graphs and...
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Whitepapers
How Bad Is Interference in IEEE 802.16e Systems?
April 14, 2010, 12:00am PDT
This paper presents a performance model for dynamic resource allocation in cellular deployments of IEEE 802.16e-like systems. More specifically, the authors derive a framework which allows to...
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Whitepapers
A Two-Stage Approach to WLAN Planning: Detailed Performance Evaluation Along the Pareto Frontier
April 27, 2010, 12:00am PDT
This paper proposes an efficient solution to the open problem of network planning for large-scale WLAN deployments. WLAN performance is governed by the CSMA-CA protocol, whose dynamic effects are...
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Whitepapers
A Game-Theoretic Approach to Routing Under Adversarial Conditions
May 14, 2010, 12:00am PDT
The authors present a game-theoretic framework for modeling and solving routing problems in dynamically changing networks. The model covers the aspects of reactivity and non-termination, and it is...
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Whitepapers
Predicting Runtime Performance Bounds of Expanded Parallel Discrete Event Simulations
May 3, 2011, 12:00am PDT
Predicting and analyzing runtime performance characteristics is a vital step in the development process of parallel discrete event simulations. For instance, model developers need to identify and...
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Whitepapers
Know Thy Simulation Model: Analyzing Event Interactions for Probabilistic Synchronization in Parallel Simulations
March 23, 2012, 12:00am PDT
Efficiently scheduling and synchronizing parallel event execution constitutes the fundamental challenge in parallel discrete event simulation. Existing synchronization algorithms typically do not...
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Whitepapers
Multi-Level Parallelism for Time-And Cost-Efficient Parallel Discrete Event Simulation on GPUs
April 18, 2012, 12:00am PDT
Developing complex technical systems requires a systematic exploration of the given design space in order to identify optimal system configurations. However, studying the effects and interactions...
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Whitepapers
Distributed TV Spectrum Allocation for Cognitive Cellular Network Under Game Theoretical Framework
August 23, 2012, 12:00am PDT
This paper proposes efficient schemes for wireless cellular base stations to utilize TV white spectrum (such base stations referred to as white base stations - WBS), so that WBSes can provide good...
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Whitepapers
On the Outage Probability and Effective Capacity of Multiple Decode-and-Forward Relay System
January 1, 2013, 12:00am PST
This paper investigates the quality-of-service performance of multiple decode-and-forward relay system. In particular, the authors study the outage probability and effective capacity performance...
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Whitepapers
The Outage Performance of Realtime Transmission in Multiple Asynchronous Relays Enhanced OFDM System
October 18, 2012, 12:00am PDT
This paper considers the outage performance of multiple relays transmission in Orthogonal Frequency Division Multiplexing (OFDM) systems. Relaying has been suggested in general to improve the...
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Whitepapers
Rate Selection Analysis Under Semi-Persistent Scheduling in LTE Networks
October 7, 2012, 12:00am PDT
Upcoming LTE networks have basically two different modes for scheduling data in the down-link by the base station. Dynamic scheduling brings the advantage of exploiting instantaneous channel state...
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Whitepapers
Impact of Measurement Configurations on the Accuracy of Propagation Model Estimation With Applications to Dynamic Spectrum Access
July 26, 2012, 12:00am PDT
In this paper, the authors investigate the possibility of using measurement-based propagation models in the framework of Dynamic Spectrum Access (DSA), where secondary users can opportunistically...
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Whitepapers
Interference Management in Heterogeneous Wireless Networks Based on Context Information
June 21, 2012, 12:00am PDT
Femtocells and WiFi have been considered as viable concepts in cellular networks to increase overall system capacity. Critical functionalities for the successful integration of such technologies...
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Whitepapers
How a Layered REM Architecture Brings Cognition to Today's Mobile Networks
June 10, 2012, 12:00am PDT
In this paper, the authors present a layered Radio Environment Map (REM) architecture along with its applications to the Self-Organizing Network (SON) functionalities of heterogeneous LTE...
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Whitepapers
Application of Functional Unit Networks to Next Generation Radio Networks
October 24, 2007, 12:00am PDT
This paper presents a framework for building reconfigurable protocol stacks. A high degree of re-configurability is achieved through composing complex behavior of a communication system using...
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Whitepapers
MAC Level Performance Evaluation of Downlink Resource Allocation Strategies for an OFDMA System Based on IEEE 802.16
May 25, 2007, 12:00am PDT
In this paper, different downlink resource allocation strategies for an OFDMA are analyzed in detail. The performance of a centrally controlled system based on IEEE 802.16 is investigated by means...
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Whitepapers
MAC Level Performance Comparison of Distributed and Adjacent OFDMA Subchannels in IEEE 802.16
May 25, 2007, 12:00am PDT
This paper provides a comprehensive simulative performance evaluation of the OFDMA sub-channel schemes which are used in the IEEE 802.16 standard. The sub-channels are either distributed or...
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Whitepapers
A Software Architecture for Modular Implementation of Adaptive Protocol Stacks
July 12, 2007, 12:00am PDT
This paper presents a modular architecture for the design, implementation and performance evaluation of protocol stacks. The architecture allows a high degree of flexibility through composing...
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Whitepapers
Impact of Signaling Constraints on the MAC Level Performance of OFDMA Systems
June 18, 2007, 12:00am PDT
Frequency adaptive scheduling in OFDMA systems requires accurate channel state information at the transmitter. In this paper, the authors investigate the performance degradation in the downlink of...
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Whitepapers
Open Traffic Systems - An Extensible Middleware for Distributed Traffic Management Systems
June 28, 2007, 12:00am PDT
Public bodies in the role of buyers and operators of traffic management systems are bound to public tendering laws stipulating a competition for the system procurement to benefit from cost...
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Whitepapers
On the Performance of Hybrid Wireless/Wired Mesh Networks
July 3, 2007, 12:00am PDT
Wireless Mesh Networks (WMNs) transparently extends the coverage of a portal via Mesh Points (MPs) which relay data over multiple hops to the associated stations. While this concept lowers costly...
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Whitepapers
IEEE 802.11s MAC Fundamentals
February 1, 2008, 12:00am PST
The tremendous success of the Institute of Electrical and Electronics Engineers (IEEE) 802.11 Wireless Local Area Network (WLAN) standard led to severe competition. Due to Wi-Fi Alliance (WFA)'s...
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Whitepapers
Analysis of WiMedia-Based UWB Mesh Networks
July 16, 2007, 12:00am PDT
Regarding maximum transmission rates, Ultra Wide Band (UWB) seems to be the wireless technology which could successfully replace most of the data-cables in office and home environments: with up to...
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Whitepapers
Distributed and Adjacent Subchannels in Cellular OFDMA Systems
October 15, 2007, 12:00am PDT
A simulative performance evaluation of a cellular mobile radio system based on Orthogonal Frequency Division Multiple Access (OFDMA) is presented in this paper. The impact of using either...
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Whitepapers
Fairness and Delay in MU-MIMO WLANs
January 25, 2008, 12:00am PST
In this paper, the Single-User (SU) and Multi-User (MU) transmission approaches in Multiple Input-Multiple Output (MIMO) Wireless Local Area Networks (WLANs) are compared. The impact of the...
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Whitepapers
Comparison of OFDMA Resource Scheduling Strategies with Fair Allocation of Capacity
July 12, 2007, 12:00am PDT
Orthogonal Frequency Division Multiple Access (OFDMA) provides possibilities to exploit diversity of a frequency selective fading channel by appropriate resource scheduling strategies. This paper...
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Whitepapers
Opportunistic Wireless Internet Access in Vehicular Environments Using Enhanced WAVE Devices
June 8, 2009, 12:00am PDT
The emerging Car-To-Car communication (C2C) technology, known as Wireless Access in Vehicular Environments (WAVE), enables vehicles on the roadway to communicate with each other and with the...
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Whitepapers
The Influence of Subchannel Diversity on the Performance of OFDMA Systems Based on IEEE 802.16
March 6, 2009, 12:00am PST
The performance of a mobile radio system based on OFDMA is determined by the type of mapping of logical sub-channels, which are allocated for data transmissions, onto the frequency channel. The...
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Whitepapers
Capacity and Coverage Analysis of a 3GPP-LTE Multihop Deployment Scenario
May 2, 2008, 12:00am PDT
Broadband wireless access will be deployed in a cellular way with 3GPP-LTE. For the first rollout the main demand is huge area coverage. With only few available base station sites that are...
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Whitepapers
An FDD Multihop Cellular Network for 3GPP-LTE
June 8, 2009, 12:00am PDT
The future cellular radio networks like 3G-LTE are based on an OFDMA physical layer. The duplex scheme is preferably Frequency Division (FDD) because of its advantages in long range. Huge area...
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Whitepapers
Theoretical Analysis of Saturation Throughput in MU-DCF
June 8, 2009, 12:00am PDT
In this paper, the calculation of saturation throughput for previously proposed Multi-User - Distributed Coordination Function (MU-DCF) is presented. MU-DCF is an IEEE 802.11 based protocol that...
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Whitepapers
IEEE 802.11s - Mesh Deterministic Access
May 2, 2008, 12:00am PDT
In 2003, interests in the Institute of Electrical and Electronics Engineers (IEEE) 802.11 Working Group (WG) led to formation of Task Group (TG) "S". 802.11s develops an amendment for Wireless...
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Whitepapers
Wireless Local Danger Warning Using Inter-Vehicle Communications in Highway Scenarios
May 2, 2008, 12:00am PDT
Emergency Electronic Brake Light (EEBL) is one of the most promising applications using Vehicular Ad-hoc NETwork (VANET) technologies to enhance the driving safety of automotive users. This paper...
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Whitepapers
Parallel Operation of Half-and Full-Duplex FDD in Future Multi-Hop Mobile Radio Networks
April 25, 2008, 12:00am PDT
There are two basic duplexing schemes for present and future mobile radio networks, Frequency-Division Duplex (FDD) and Time-Division Duplex (TDD). In general each of these methods has its...
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Whitepapers
Raising Coverage and Capacity Using Fixed Relays in a Realistic Scenario
April 25, 2008, 12:00am PDT
Multihop techniques are known as a practical solution for covering huge radio cell areas when there are only very few Base Stations (BS). This is the case when fiber access is limited and BS CAPEX...
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Whitepapers
A Multi-Mode MAC Protocol Integrating FDD and TDD for Next Generation Multi-Hop Mobile Radio Networks
June 8, 2009, 12:00am PDT
There are two basic duplexing schemes for present and future mobile radio networks, frequency-division duplexing and time-division duplexing. In general each of these methods has its benefits and...
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Whitepapers
Asynchronous Mobile Web Services: Concept and Architecture
April 3, 2008, 12:00am PDT
Today, mobile devices are capable of providing services instead of just being service consumers. These services deployed on mobile devices are known as Mobile Web Services (Mob-WS). In this paper,...
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Whitepapers
Unorthodox Abstract Models for the OFDMA Multihop Transmission
July 15, 2008, 12:00am PDT
Wireless systems are complex devices and a lot of research is done to improve parts of these systems and get a better understanding of the total behavior. One step towards an easier understanding...
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