Proceedings ArticleDOI
WCDMA STTD performance analysis with transmitter location optimization in indoor systems using ray-tracing technique
K.K. Bae,Jing Jiang,William H. Tranter,Christopher R. Anderson,Theodore S. Rappaport,Jian He,Alex Verstak,Layne T. Watson,Naren Ramakrishnan,Clifford A. Shaffer +9 more
- pp 123-127
TLDR
Based on the performance, transmitter location optimization in indoor environments is considered and results indicate that the effective diversity order is retained even when high cross correlation exists and power imbalance exists between signals from different antennas.Abstract:
This paper presents the performance of space-time block coding based transmit diversity (STTD) in WCDMA on correlated fading channels and on unbalanced transmitted power. Then, based on the performance, transmitter location optimization in indoor environments is considered. Results indicate that the effective diversity order is retained even when high cross correlation exists and power imbalance exists between signals from different antennas. Also, a global optimization algorithm with the help of a ray tracer can find transmitter locations which are optimal (global optimum) in the sense of power coverage or overall BER in the area of interest.read more
Citations
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Dissertation
Global Optimization of Transmitter Placement for Indoor Wireless Communication Systems
Jian He,Alex Verstak,Layne T. Watson,Theodore S. Rappaport,Christopher R. Anderson,Naren Ramakrishnan,Clifford A. Shaffer,William H. Tranter,William H. Tranter,K.K. Bae,Jing Jiang +10 more
TL;DR: A set of dynamic data structures is proposed here to balance the memory requirements with execution time, while simultaneously adapting to arbitrary problem size to make the DIRECT global optimization algorithm efficient and robust.
Dissertation
Design and Evaluation of a Data-distributed Massively Parallel Implementation of a Global Optimization Algorithm---DIRECT
TL;DR: The generalized design considerations and analysis techniques are beneficial for transforming many global search algorithms to become effective large scale parallel optimization tools.
Dissertation
Data and Computation Modeling for Scientific Problem Solving Environments
TL;DR: This thesis investigates several issues in data and computation modeling for scientific problem solving environments (PSEs) and emphasizes data modeling and management, two important aspects that have been largely neglected in modern PSE research.
Dissertation
Capacity-approaching data transmission in MIMO broadcast channels
TL;DR: Simulations show that in an interference-limited multi-cell scenario, greater performance improvement can be achieved by interference avoidance through adaptive packet scheduling, rather than by interference diversity or averaging alone.
References
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Book
Wireless Communications: Principles and Practice
TL;DR: WireWireless Communications: Principles and Practice, Second Edition is the definitive modern text for wireless communications technology and system design as discussed by the authors, which covers the fundamental issues impacting all wireless networks and reviews virtually every important new wireless standard and technological development, offering especially comprehensive coverage of the 3G systems and wireless local area networks (WLANs).
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A simple transmit diversity technique for wireless communications
TL;DR: This paper presents a simple two-branch transmit diversity scheme that provides the same diversity order as maximal-ratio receiver combining (MRRC) with one transmit antenna, and two receive antennas.
Journal ArticleDOI
Lipschitzian optimization without the Lipschitz constant
TL;DR: In this article, the Lipschitz constant is viewed as a weighting parameter that indicates how much emphasis to place on global versus local search, which accounts for the fast convergence of the new algorithm on the test functions.
Journal ArticleDOI
Space subdivision for fast ray tracing
TL;DR: In this article, an octree-based algorithm is proposed to reduce the number of time-consuming object-ray intersection calculations by associating a given voxel with only those objects whose surfaces pass through the volume of the Voxel, which makes possible the ray tracing of complex scenes by medium-scale and small-scale computers.
Journal ArticleDOI
Site-specific propagation prediction for wireless in-building personal communication system design
TL;DR: Time delay comparison shows that the amplitudes of many significant multipath components are accurately predicted by this model, and the effective building material properties are derived for two dissimilar buildings based upon comparison of measured and predicted power delay profiles.