International Symposium on Wireless Communication Systems (ISWCS)
2006 3rd International Symposium on Wireless Communication Systems
6-8 Sept. 2006
Showing 1-25 of 173
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Wireless Communication Systems (ISWCS), 2006 3rd International Symposium on
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Iterative Frequency-Domain Decision-Feedback Equalization
Publication Year: 2006,Page(s):1 - 5
Cited by: Papers (9)
Single-carrier transmission with frequency-domain equalization (SCT/FDE) is today recognized as an attractive alternative to orthogonal frequency-division multiplexing (OFDM) for wireless applications with large channel dispersions. In this paper, we investigate iterative frequency-domain decision- feedback equalization (FD/DFE), which significantly improves performance with respect to linear equa...Show More
Staggered Trellis Coded Modulation with Increased Frame-Wise Memory
Publication Year: 2006,Page(s):6 - 10
Cited by: Papers (2)
Staggered trellis coded modulation was recently presented as a special concatenated coding scheme employing bandwidth-efficient trellis coded modulation. Thanks to the additionally introduced frame-wise memory it outperforms the conventional parallel concatenated trellis coded modulation. The drawback of the original construction is that the order of the frame-wise memory is limited to be 1. In th...Show More
Transmit Power Allocation for V-BLAST Systems with ZF-OSIC Detection
Publication Year: 2006,Page(s):11 - 15
Cited by: Papers (1)
This paper proposes a new transmit power allocation (TPA) scheme for the vertical bell layered space time (V-BLAST) system with zero-forcing ordered successive interference cancellation (ZF-OSIC) detection. The proposed TPA scheme is based on the minimization of the average probability of vector error subject to a constraint on the total average transmitted power. To derive the TPA algorithm, we c...Show More
Opportunistic Communications with Distorted CSIT
Publication Year: 2006,Page(s):16 - 20
Cited by: Papers (4)
The effects of distorted Channel State Information at the Transmitter (CSIT) on opportunistic schemes are investigated for the symmetric broadcast channels. Opportunistic schemes are defined in the presence of distorted CSIT, by specification of scheduling schemes and rate-adaptation schemes. Then, two types of CSIT distortion — either from noisy feedback channel or from delay — are considered, an...Show More
In present paper we have investigated a co-channel interference cancellation technique based on the tracking a limited number of strongest interferers only. With the assumption of synchronous base stations operation with overlapping but different training signals (pilots). Kalman filtering may be used for interfering channels estimation and further calculation of interference correlation matrix. T...Show More
Image Transmission using Variable M-QAM with Optimized Bit Power Allocation
Publication Year: 2006,Page(s):25 - 29
Cited by: Papers (2)
In this paper, optimization of minimum mean square error for image transmission using a variable M-QAM system is proposed for improving both power and bandwidth efficiencies. Optimization is based on bit power allocation according to the importance of bits to the overall image quality. An iterative off-line algorithm is presented to find the optimum power allocated and modulation level to differen...Show More
A Perspective on Radio Resource Management in B3G
Publication Year: 2006,Page(s):30 - 34
Cited by: Papers (9)
Beyond 3G usually refers to heterogeneous scenarios where different Radio Access Technologies (RATs) coexist and operate in a coordinated way. This brings a new challenge to offer services to the users over an efficient and ubiquitous radio access. In this way, the user can be served through the RAT that fits better to the terminal capabilities and service requirements, and also a more efficient u...Show More
Utility Based Adaptive Resource Allocation for Heterogeneous QoS Requirements
Publication Year: 2006,Page(s):35 - 39
Cited by: Papers (2)
A wireless resource allocation algorithm based on utility functions is presented. Distinct utility functions dependent on the specific traffic class and the numerical QoS requirements are combined and maximised, so that different treatment is provided to each data flow. This approach is applied to allocate subcarriers and slots of an adaptive OFDMA scheme for services with heterogeneous QoS requir...Show More
Hopfield Neural Network Algorithm for Dynamic Resource Allocation in WCDMA Systems
Daniel Calabuig;Jose Monserrat;David Gomez-Barquero;Narcis Cardona
Publication Year: 2006,Page(s):40 - 44
Cited by: Papers (2)
This paper proposes a dynamic resource allocation (DRA) algorithm for WCDMA systems for non-real time data services using a Hopfield neural network (HNN). Previous works have demonstrated the utility of HNN to implement DRA algorithms in the uplink due to the high computational speed of its hardware implementation and the maximization of the total allocated bandwidth. This paper presents an enhanc...Show More
Dimensioning and Configuring Cross-Layer Channel Assignment Schemes in Packet Mobile Radio Networks with Mixed Traffic Services
Alberto Rodriguez-Mayol;Javier Gozalvez;Joaquin Sanchez Soriano
Publication Year: 2006,Page(s):45 - 49
This work proposes a cross-layer FCA channel assignment scheme designed to efficiently handle multimedia communications in an heterogeneous traffic environment. The scheme has been designed to enable QoS priorisation of certain traffic types or user classes. To do so, the proposed technique provides mechanisms to reserve the use of given channels in interfering co-channel cells. The paper details ...Show More
Strategies for Call Admission Control in Integrated Services Wireless Mobile Networks
Publication Year: 2006,Page(s):50 - 54
Call admission control (CAC) and its effects on quality of service (QoS) for integrated services wireless networks are studied. A wireless cell with m channels is considered. The cell serves three different types of calls; types 1, 2 and 3, corresponding to voice, data and video services respectively. Type i calls require bi channels for their service. The wireless cell serves newly arriving as we...Show More
Experimental Evaluation of Correlation Properties of Large Scale Parameters in an Indoor LOS Environment
Aihua Hong;Christian Schneider;Gerd Sommerkorn;Marko Milojevic;Reiner Thoma;Wolfgang Zirwas
Publication Year: 2006,Page(s):55 - 59
Cited by: Papers (8)
The primary goal of this paper is through examining a set of measurement data to show that the spatial variation properties of large scale parameters can well be expressed by the exponential decaying function, as proposed by Algans et al. (2002), but with quite a small decorrelation distance. The large scale parameters include large scale fading and delay spread as well as azimuth spreads at the t...Show More
On Building Modeling for Multiple Diffraction Analysis in Urban Environments considering Spherical-Wave Incidence
Jose-Victor Rodriguez;Maria-Jose Garcia-Martinez;Jose-Maria Molina-Garcia-Pardo;Leandro Juan-Llacer
Publication Year: 2006,Page(s):60 - 62
A study of the influence of building modeling when predicting the signal attenuation due to over-rooftop multiple diffraction in urban environments is presented. A straightforward formulation expressed in terms of uniform theory of diffraction (UTD) coefficients is used for the above-mentioned analysis assuming a spherical-wave incidence over the array of buildings and considering the latter model...Show More
Characterisation of Signal Penetration into Buildings for GSM and UMTS
Lucio Ferreira;Martijn Kuipers;Carlos Rodrigues;Luis M. Correia
Publication Year: 2006,Page(s):63 - 67
Cited by: Papers (12)
A study of the extra signal attenuation due to building penetration associated to path loss from the base stations to mobile terminals, for different types of buildings and rooms is presented for GSM (900 and 1800 MHz) and UMTS. In this study, a statistical model for the attenuation penetration is developed, following the log-normal distribution, applied to a building classification, and supported...Show More
Path loss and Wideband Channel Model Parameters for WINNER Link and System Level Evaluation
Christian Schneider;Aihua Hong;Gerd Sommerkorn;Marko Milojevic;Reiner S. Thoma
Publication Year: 2006,Page(s):68 - 72
Cited by: Papers (6)
In this paper double-directional wideband channel measurements at 5.2 GHz and 120MHz bandwidth for hot spot outdoor and indoor scenarios are presented. Statistical analysis based on the measurements derive spatial and temporal parameters for the recently published WINNER1 channel model. The focus is on channel models for link level evaluation and radio network planning, whereby the tapped delay li...Show More
Eigen/Capacity Analysis for Indoor Correlated MIMO Channels between 2 and 4 GHz
Publication Year: 2006,Page(s):73 - 77
Cited by: Papers (3)
The space-time wireless communications systems will use the advantages of the MIMO (multiple input multiple output) channels. Precedent studies have focused less attention on the eigen/capacity analysis with correlated channels under different frequencies for indoor environments. The results derived from a frequency measurement campaign performed between 2 and 4 GHz, show frequency band dependence...Show More
RF spectrum utilization offers information about how much and how often a given licensed or unlicensed spectrum is used. Methods and techniques for estimating the RF spectrum utilization are needed either for spectrum sharing, assessing harmful interference within licensed/unlicensed frequency bands or for auditing the radio environment before commissioning new access nodes [1-3,6]. The paper addr...Show More
Optical Routing in Massively Dense Networks: Practical Issues and Dynamic Programming Interpretation
Publication Year: 2006,Page(s):83 - 87
Cited by: Papers (17)
A form of routing based on an analogy with geometrical optics has recently been proposed for use in wireless networks with a very large number of nodes. The analogy hinges on taking a macroscopic view of the network, and describing it solely in terms of a cost function, that is analogous to the refractive index of optics. In this setting, optimal routes resemble rays of light propagating through a...Show More
On the Convenience of Turning Off the Radio Interface and using Multiple Transmission Power Levels in Sensor Networks Applying Geographical Forwarding
Publication Year: 2006,Page(s):88 - 92
Cited by: Papers (2)
Energy is a precious resource in wireless sensor networks. Accordingly, several approaches have been proposed in the literature to increase energy efficiency. In some of such approaches radio interface is periodically turned off. As a consequence, the energy spent by each node is expected to decrease. In this paper we argue that this is not always true if geographical forwarding is applied. In fac...Show More
A Distributed Direction of Arrival Estimation Algorithm for Self-Organizing Ultra Wide-Band Wireless Sensor Networks
Marco Di Renzo;Alessandro D'Onofrio;Fabio Graziosi;Fortunato Santucci
Publication Year: 2006,Page(s):93 - 97
Cited by: Papers (1)
In this paper we investigate the problem of Direction of Arrival (DoA) estimation in distributed and self-organizing Wireless Sensor Networks (WSNs), which use Ultra Wide-Band (UWB) technology at the physical layer. The proposed DoA estimation technique is based on the Spectral Correlation Multiple Signal Classification (SC-MUSIC) algorithm, which is well suited for wide-band signals and relies on...Show More
Smart Wireless Impulse Radio Sensor Networks
J. Dominguez;J. Jacobo;M. Lobeira;A. Alvarez;B. Quijano;J.L. Garcia
Publication Year: 2006,Page(s):98 - 102
This paper introduces the work performed towards an Impulse Radio Wireless Sensor Network system. An overview of the fundamentals of the system is reported, from concept sections including applications and requirements, to the design and development of the hardware platform, networking protocols or routing algorithms. The low power, size and cost are key requirements influencing the whole system d...Show More
A Bayesian Decision Model for Intelligent Routing in Sensor Networks
Rocio Arroyo-Valles;Antonio G. Marques;Juan Jose Vinagre-Diaz;Jesus Cid-Sueiro
Publication Year: 2006,Page(s):103 - 107
Cited by: Papers (10)
Proceedings
The proceedings of this conference will be available for purchase through Curran Associates.
Wireless Communication Systems (ISWCS), 2006 3rd International Symposium on
- CD-ROMPurchase at Partner
- Print on DemandPurchase at Partner
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