Attaining both coverage and high spectral efficiency with adaptive OFDM downlinks

Sternad, Mikael; Ottosson, T.; Åhlén, Anders; Svensson, Arne

doi:10.1109/vetecf.2003.1285981

Cited by 136 publications

(92 citation statements)

References 8 publications

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“…Each time-frequency bin carries 120 symbols 1 . Of the 120 symbols, 12 are for training and downlink control, leaving 108 payload symbols useful for data transfer.…”

Section: B Wireless Ip System Downlink Designmentioning

confidence: 99%

“…In brief, 1 A subcarrier spacing of 10 kHz and a symbol period of 111 µs is used. the gateway collects IP packets destined for the "mobile node" and passes them to the emulator software, which emulates the transmission of the packets over the wireless link.…”

Section: The Emulatormentioning

confidence: 99%

“…It shows the number of bits carried in each symbol per modulation level (1), and the theoretical maximum bits per second (2). The table shows further the measured throughput on the application level (3), and the throughput added by headers (4) and compensation for truncation in the last frame (5).…”

Section: Using Fixed Modulation Formats Without Packet Errorsmentioning

confidence: 99%

“…One 4G system proposal based on OFDM has been developed within the "Wireless IP" project at Uppsala University, in cooperation with Chalmers University of Technology and Karlstad University [1], [2]. The main focus is to cover wide areas to service vehicular users, in excess of speeds of 100 km/h with a 30-fold bandwidth increase compared to UMTS/3G.…”

Section: Introductionmentioning

confidence: 99%

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Transport Protocol Performance over 4G Links: Emulation Methodology and Results

Alfredsson

Brunström

Sternad

2006

2006 3rd International Symposium on Wireless Communication Systems

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Abstract-This paper presents a wireless link and network emulator for the "Wireless IP" 4G system proposal from Uppsala University and partners. In wireless fading downlinks (base to terminals) link-level frames are scheduled and the transmission is adapted on a fast time scale. With fast link adaptation and fast link level retransmission, the fading properties of wireless links can to a large extent be counteracted at the physical and link layers. The emulator has been used to experimentally investigate the resulting interaction between the transport layer and the physical/link layer in such a downlink. The paper introduces the Wireless IP system, describes the emulator design and implementation, and presents experimental results with TCP in combination with various physical/link layer parameters. The impact of link layer ARQ persistency, adaptive modulation, prediction errors and simple scheduling are all considered.

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“…Each time-frequency bin carries 120 symbols 1 . Of the 120 symbols, 12 are for training and downlink control, leaving 108 payload symbols useful for data transfer.…”

Section: B Wireless Ip System Downlink Designmentioning

confidence: 99%

Section: The Emulatormentioning

confidence: 99%

Section: Using Fixed Modulation Formats Without Packet Errorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Transport Protocol Performance over 4G Links: Emulation Methodology and Results

Alfredsson

Brunström

Sternad

2006

2006 3rd International Symposium on Wireless Communication Systems

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“…The base stations (BSs) of adjacent cells coordinate beforehand and agree on the allocations of these frequency chunks, to ensure that the "edge spectrum chunks" of adjacent cells differ. In partial frequency reuse [4] [5], frequency reuse factor is set to be 1 for cell center MSs and 3 for cell edge MSs, which inevitably necessitates strict frequency planning. Performances of those two different schemes are compared in [6].…”

Section: Introductionmentioning

confidence: 99%

Inter-Cell Interference Management in WiMAX Downlinks by A Stackelberg Game between BSs

Chen

Teo²,

Kishore

et al. 2008

2008 IEEE International Conference on Communications

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We develop a game theoretic framework for effective and adaptive inter-cell interference management in the OFDMA-based WiMAX/3GPP-LTE systems. Such approach requires no fixed spectrum planning beforehand and does not affect the spectrum usage for users that are not subject to inter-cell interference. Based on the handoff mechanisms in WiMAX systems, we also examine means of categorizing users who are, or are not, subject to potential interference. Different optimization opportunities for BSs are identified and analyzed. The interactions between BSs are modeled by a Stackelberg game in which BSs can make intelligent and rational decisions to reduce interference with minimum optimization cost. The algorithm to attain stable Nash Equilibrium is investigated and the behaviors of BSs with different preferences in the game are examined ICC 2008This work may not be copied or reproduced in whole or in part for any commercial purpose. Permission to copy in whole or in part without payment of fee is granted for nonprofit educational and research purposes provided that all such whole or partial copies include the following: a notice that such copying is by permission of Mitsubishi Electric Research Laboratories, Inc.; an acknowledgment of the authors and individual contributions to the work; and all applicable portions of the copyright notice. Copying, reproduction, or republishing for any other purpose shall require a license with payment of fee to Mitsubishi Electric Research Laboratories, Inc. All rights reserved.

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2014

Positioning in Wireless Communications Systems

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Attaining both coverage and high spectral efficiency with adaptive OFDM downlinks

Cited by 136 publications

References 8 publications

Transport Protocol Performance over 4G Links: Emulation Methodology and Results

Transport Protocol Performance over 4G Links: Emulation Methodology and Results

Inter-Cell Interference Management in WiMAX Downlinks by A Stackelberg Game between BSs

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