Bit Loading Using Imperfect CSIT for Prediction-Based Resource Allocation in Mobile OFDMA

We present a prediction-based resource allocation algorithm (RA) for orthogonal frequency-division multiple-access (OFDMA) downlink, where inaccuracies in the wireless channel predictions are accounted for in the problem formulation. As the prediction quality significantly degrades with the predicti...

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Vydané v:	IEEE transactions on vehicular technology Ročník 60; číslo 8; s. 4082 - 4088
Hlavní autori:	Schmidt, J. F., Cousseau, J. E., Wichman, R., Werner, S.
Médium:	Journal Article
Jazyk:	English
Vydavateľské údaje:	New York, NY IEEE 01.10.2011 Institute of Electrical and Electronics Engineers The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Predmet:	Algorithms Applied sciences Bit error rate Channel estimation Channel state information Channels Computer simulation Detection, estimation, filtering, equalization, prediction Equipments and installations Errors Exact sciences and technology Histograms Information, signal and communications theory Kalman filters Loading Mobile radiocommunication systems Multiplexing OFDM orthogonal frequency-division multiple-access (OFDMA) prediction algorithm Prediction algorithms Radiocommunications Resource allocation scheduling algorithm Signal and communications theory Signal, noise Stations Strategy Studies Systems, networks and services of telecommunications Telecommunications Telecommunications and information theory time-varying channels Transmission and modulation (techniques and equipments) Transmitters wireless communications Performance evaluation wireless communications Parameter estimation Histogram Predictor Wireless telecommunication Resource allocation Frequency division multiple access Information rate Transmitter orthogonal frequency-division multiple-access (OFDMA) Downlink scheduling algorithm Implementation Channel estimation time-varying channels Traffic control Channel state information Mobile radiocommunication Time variable channel histograms Flow rate regulation Teletraffic Scheduling Algorithm Information transmission prediction algorithm Telecommunication channels Orthogonal frequency division multiplexing System simulation Planning Resource management
ISSN:	0018-9545, 1939-9359
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Popis
Shrnutí:	We present a prediction-based resource allocation algorithm (RA) for orthogonal frequency-division multiple-access (OFDMA) downlink, where inaccuracies in the wireless channel predictions are accounted for in the problem formulation. As the prediction quality significantly degrades with the prediction horizon, we propose a solution based on the histogram of the prediction error. This characterization also enables different mobile stations (MSs) to use different channel predictors as it does not rely on a specific prediction scheme. Using this characterization of the prediction error and based on classical resource allocation strategies, we derive an algorithm that incorporates imperfect channel prediction information of future time slots. We evaluate the proposed algorithm using a practical low-complexity channel predictor suitable for implementation at the MSs. Simulation results show that the proposed algorithm outperforms previous prediction-based RA strategies without the characterization of the prediction error, and the system throughput is comparable with the case with perfect channel state information in the transmitter (CSIT).
Bibliografia:	ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 14 content type line 23
ISSN:	0018-9545 1939-9359
DOI:	10.1109/TVT.2011.2165305