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检索条件"任意字段=3rd International Symposium on Code Generation and Optimization"

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Automated and remotely optimization of antenna subsystem based on radio network performance

Automated and remotely optimization of antenna subsystem bas...

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international symposium on Wireless Personal Multimedia Communications (WPMC)

作者： A. Wacker K. Sipila A. Kuurne Nokia Networks Espoo Finland

3rd generation (3G) radio networks using WCDMA radio access technology will offer the customers services with higher bit rates than in nowadays 2nd generation networks. All users share the same frequency resource, therefore 3G networks are commonly believed to be interference limited. For this reason it is of utmost importance to exploit all possibilities in keeping the interference level as low as possible. One means for this, already used in 2G systems, is adjusting the downtilt of the antennas in a way, reducing the interference transmitted and received as much as possible, still ensuring the required coverage. In earlier studies it has been shown how careful radio network planning already in the preoperational phase can drastically increase 3G network performance. Optimal downtilt was found by applying a constant tilt to all cells in the network. The network consisted only of very high sites and therefore the gains of e.g. 40-50% in capacity were considered to be optimistic. The scope of the simulations for this paper therefore was to evaluate the gains in terms of capacity by optimizing the antenna tilt of WCDMA networks cell by cell in a more realistic environment, showing still gains of up to 20%.

关键词： Radio network Multiaccess communication Interference Testing Frequency Telecommunication traffic Bit rate Directive antennas Automatic control Customer service

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OSSC: A new scheme for code allocation in WCDMA

OSSC: A new scheme for code allocation in WCDMA

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12th international symposium on Personal, Indoor and Mobile Radio Communications (PIMRC 2001)

作者： Al-Meshhadany, T. Al Agha, K. Lab. de Recherche en Informatique Bât 490 Université Paris Sud 91405 Orsay Cedex France

Future wireless systems will have to support multimedia services such as voice, video and data. Several mechanisms, like multiple access, bandwidth allocation and power control are used for providing these multimedia services. In the 3rd generation of wireless systems, WCDMA is used to be the access method in the FDD mode. Therefore, the capacity of the system is based on the cross correlation among the user's allocated scrambling codes. In this work, we analyze the WCDMA uplink resource allocation and propose a new method, called One Service - one Scrambling code (OSSC), that reduces the aggregate number of scrambling codes assigned to users in a cell. We also study the impact of the scrambling code assignment on the call interference and the system capacity. Analytical model is provided in this paper.

关键词： code division multiple access

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3rd international symposium on Practical Aspects of Declarative Languages, PADL 2001

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3rd international symposium on Practical Aspects of Declarative Languages, PADL 2001

ISBN: (纸本)9783540417682

The proceedings contain 23 papers. The special focus in this conference is on Practical Aspects of Declarative Languages. The topics include: A model checker for value-passing mu-calculus using logic programming;from subject directories to subject meta-directories via declarative programming;programming goal-driven web sites using an agent logic language;high-level server side web scripting in curry;logic programming techniques for dynamic VRML web content generation;soft constraints for security protocol analysis;specifying authentication protocols using rewriting and strategies;interoperability between bioinformatics tools;an a-prolog decision support system for the space shuttle;a light-weight prolog for internet applications and infrastructures;a novel implementation of the extended Andorra model;compiling high-level type constructors in constraint programming;constraint database models characterizing timed bisimilarity;spatio-temporal annotated constraint logic programming;construction and optimization of a parallel engine for answer set programming;a declarative language for visual tracking and a most specific method finding algorithm for reflection based dynamic prolog-to-java interfaces.

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State generation in the parmc model checker 3rd

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3rd international symposium on Practical Aspects of Declarative Languages, PADL 2001

作者： Kaser, Owen University of New Brunswick Saint John Canada

ISBN: (纸本)9783540417682

The PARMC system performs modelc hecking for systems described in the XL language, a variant of CCS. Extending previous work by Dong and Ramakrishnan that compiled XL specifications into an optimized transition relation, we take their transition relation and compile it into S-code, producing instructions for a new lightweight engine S that was custom designed for PARMC. Difficult constructs are handled by the XSB logic programming engine, enabling both generality (from XSB) and speed (from S). States are maintained in a compressed representation, also improving memory utilization. Experiments were performed and showed that the anticipated speed and memory improvements were achieved. © Springer-Verlag Berlin Heidelberg 2001

关键词： Logic programming

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High volume fly ash RCC for dams - 1: Mixture optimization and mechanical properties 3

High volume fly ash RCC for dams - 1: Mixture optimization a...

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2001 3rd CANMET/ACI international symposium: Sustainable Development of Cement and Concrete

作者： Lahus, O. Jacobsen, S. The Norwegian Building Research Institute P. O. Box 123 Blindern Oslo Norway PEAB in Oslo Norway

ISBN: (纸本)9780870310416

A series of roller-compacted concrete mixtures were developed for the Norwegian Skjerka hydropower project. The mixture optimization was based on the medium-paste concept of the international Committee On Large Dams (ICOLD) using crushed aggregate from the dam site. The mixture optimization consists of a two-step procedure minimizing the paste content, keeping the compacted density above 97.5 % of the theoretical air-free density, and giving an optimal loaded Vebe time of 10 - 20 seconds. Nine mixtures were produced using low calcium fly ash and portland cement with various fly ash-cement propotions. The waterbinder ratio was kept constant at 0.53 according to the Norwegian code for mass concrete for dams. The laboratory test results showed that 8 of 9 binder combinations produced RCC within the design criteria. The compressive strength development of the water-cured specimens was impressive despite the rather low cement contents, giving 1 year strengths of 2 times the 28-day strengths. The use of high-volume fly ash concrete for RCC dams is one example of concrete in harmony with lower environmental impact and less use of resources. © 2001 American Concrete Institute. All rights reserved.

关键词： Fly ash

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Comparison of transmit array algorithms for code division multiple access downlinks operating in the frequency division duplexing mode

Comparison of transmit array algorithms for code division mu...

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12th international symposium on Personal, Indoor and Mobile Radio Communications (PIMRC 2001)

作者： Jötten, C.A. Meurer, M. Baier, P.W. Research Group for RF Communications University of Kaiserslautern P.O. Box 3049 D-67653 Kaiserslautern Germany

It is expected that in the forthcoming 3rd generation (3G) mobile radio systems the downlinks will have to support much higher data rates than the uplinks. A promising measure to enable high downlink data rates consists in improving the carrier-to-interference ratios at the mobile receivers by the utilization of adaptive multi-element transmit antennas. However, for the efficient operation of such antennas information about the downlink radio channels is required at the base stations. In the case of the 3G partial standard Time Division(TD)-CDMA designated for the Time Division Duplexing (TDD) radio frequency bands, such information - thanks to the reciprocity theorem - is readily available from the uplink channel estimators. However, the 3G partial standard W(Wideband)-CDMA designated for the Frequency Division Duplexing (FDD) radio frequency bonds suffers from the inherent disadvantage that, due to the frequency difference between uplink and downlink, the results of the uplink channel estimation cannot be directly used as the channel information required for adjusting the multi-element transmit antennas. Nevertheless, as long as the frequency difference between uplink and downlink is not ton large, approaches to an at least sub-optimum adjustment of the downlink transmit antennas based on uplink channel estimates exist. In the paper such approaches will be presented and evaluated by simulations.

关键词： Telecommunication links

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Joint transmission (JT), an alternative rationale for the downlink of Time Division CDMA using multi-element transmit antennas

Joint transmission (JT), an alternative rationale for the do...

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2000 IEEE 6th international symposium on Spread Spectrum Techniques and Applications (ISSSTA 2000)

作者： Baier, P.W. Meurer, M. Weber, T. Troeger, H. Univ of Kaiserslautern Kaiserslautern Germany

In the 3rd generation Partnership Project (3GPP) Time Division CDMA (TD-CDMA) has been selected as the air interface for the TDD (Time Division Duplexing) bands of 3rd generation (3G) mobile radio systems . In the case of TDD the same channel impulse responses are valid for both the uplink and the downlink. In state-of-the-art TD-CDMA characterized by joint data detection (JD) this equality cannot be exploited for enhancing system performance and reducing system complexity. In the paper a novel TD-CDMA downlink transmission scheme is proposed. This scheme is termed joint transmission (JT). It utilizes the knowledge of the channel impulse responses gained by channel estimation at the base station in such a way that channel estimators are no longer required at the mobile stations and the computational expense of data detection is dramatically reduced. The scheme easily lends itself to the utilization of multi-element transmit antennas. Further, its application is not restricted to systems of the type TD-CDMA.

关键词： code division multiple access

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Automatic synthesis of multi-tasking implementations from real-time object-oriented models 3

Automatic synthesis of multi-tasking implementations from re...

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3rd IEEE international symposium on Object-Oriented Real-Time Distributed Computing, ISORC 2000

作者： Saksena, M. Karvelas, P. Wang, Y. Department of Computer Science Concordia University MontrealQCH3G 1M8 Canada

ISBN: (纸本)0769506070

Presents an approach towards the automatic synthesis of implementations from real-time object-oriented design models. From an application design model that addresses the functional requirements of the system, and given end-to-end timing requirements, our synthesis approach generates a feasible implementation model, i.e. one that will meet the timing requirements. The synthesis process is supported by automatic code generation that can take the application design model and the synthesized implementation model, and can generate code for the target platform. The synthesis of an implementation model is facilitated through the use of a generic (application-independent) implementation architecture, thereby reducing the synthesis problem to selecting a mapping of the application design model to the artifacts of the implementation architecture. In this paper, we use a multi-threaded event handling architecture with fixed event priorities. The synthesis problem then consists of determining priorities for events and mapping events to threads. We show how, given such a mapping, the response times can be analyzed, and then how, using the analysis, a feasible implementation model can be automatically synthesized. © 2000 IEEE.

关键词： Mapping

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W-CDMA transceiver core and a simulation environment for 3GPP terminals

W-CDMA transceiver core and a simulation environment for 3GP...

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2000 IEEE 6th international symposium on Spread Spectrum Techniques and Applications (ISSSTA 2000)

作者： Lugil, N. Philips, L. Sirius Communications NV Rotselaar Belgium

This paper describes a software reconfigurable core for use in 3GPP (3rd generation Partnership Project) mobile terminals. It contains the W-CDMA transceiver functionality of the baseband. Different 3G applications can be executed on it by reconfiguring the parameters in the memory map. A bit-accurate C-based simulator of the W-CDMA core allows physical layer simulation at a reasonable speed. Co-simulation with other base-band functions, channel models and L1 software is supported as well.

关键词： code division multiple access

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Adaptive channel equalization and interference suppression for CDMA downlink

Adaptive channel equalization and interference suppression f...

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2000 IEEE 6th international symposium on Spread Spectrum Techniques and Applications (ISSSTA 2000)

作者： Komulainen, Petri Heikkila, Markku J. Lilleberg, Jorma Nokia Mobile Phones Oulu Finland

In the synchronous CDMA downlink using orthogonal codes, the intracell multiple access interference (MAI) is essentially caused by the frequency selective multipath channel. Therefore, intracell MAI may be suppressed by simple linear channel equalization. Similarly, intercell interference can be suppressed by means of linear space-time filtering. In this paper we compare two different adaptive receiver algorithms in the context of one or several receive antenna elements. The first one is based on adaptive LMMSE chip estimation, whereas the other one performs simple interchip interference cancellation by adaptive chip separation. The presented receiver structures are suitable for systems with long code scrambling, such as 3rd generation Wideband CDMA standard. The results show considerable performance gains when compared to the conventional RAKE receiver.

关键词： code division multiple access

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