TU Darmstadt / ULB / TUbiblio

Throughput Analysis of Multi-User OFDMA-Systems using Imperfect CQI Feedback and Diversity Techniques

Kühne, Alexander ; Klein, Anja (2008)
Throughput Analysis of Multi-User OFDMA-Systems using Imperfect CQI Feedback and Diversity Techniques.
In: IEEE Jounal on Selected Areas in Communications, 26 (10)
doi: 10.1109/JSAC.2008.081010
Article, Bibliographie

Abstract

In this paper, the throughput of an adaptive multiuser SISO-OFDMA/FDD system with channel quality information (CQI) signalled digitized over a feedback channel to the transmitter is investigated, where the instantaneous signal-to-noise ratio (SNR) of the different subcarriers is used as CQI to exploit multi-user diversity using adaptive subcarrier allocation. The CQI available at the transmitter is assumed to be imperfect due to estimation errors and quantization at the receiver side, time delay and feedback errors. In this paper, a closed form expression of the average throughput of an adaptive multi-user OFDMA system using imperfect CQI and uncoded M-QAM modulation is derived. Furthermore, a closed form expression of the average throughput of an OFDMA system exploiting frequency diversity, which does not require CQI at the transmitter, is presented. Both throughput performances are compared in order to identify the optimal transmission strategy depending on the grade of CQI imperfectness.

Item Type: Article
Erschienen: 2008
Creators: Kühne, Alexander ; Klein, Anja
Type of entry: Bibliographie
Title: Throughput Analysis of Multi-User OFDMA-Systems using Imperfect CQI Feedback and Diversity Techniques
Language: English
Date: 10 October 2008
Publisher: IEEE
Journal or Publication Title: IEEE Jounal on Selected Areas in Communications
Volume of the journal: 26
Issue Number: 10
DOI: 10.1109/JSAC.2008.081010
Abstract:

In this paper, the throughput of an adaptive multiuser SISO-OFDMA/FDD system with channel quality information (CQI) signalled digitized over a feedback channel to the transmitter is investigated, where the instantaneous signal-to-noise ratio (SNR) of the different subcarriers is used as CQI to exploit multi-user diversity using adaptive subcarrier allocation. The CQI available at the transmitter is assumed to be imperfect due to estimation errors and quantization at the receiver side, time delay and feedback errors. In this paper, a closed form expression of the average throughput of an adaptive multi-user OFDMA system using imperfect CQI and uncoded M-QAM modulation is derived. Furthermore, a closed form expression of the average throughput of an OFDMA system exploiting frequency diversity, which does not require CQI at the transmitter, is presented. Both throughput performances are compared in order to identify the optimal transmission strategy depending on the grade of CQI imperfectness.

Divisions: 18 Department of Electrical Engineering and Information Technology
18 Department of Electrical Engineering and Information Technology > Institute for Telecommunications
18 Department of Electrical Engineering and Information Technology > Institute for Telecommunications > Communications Engineering
Date Deposited: 11 Jul 2023 12:17
Last Modified: 11 Jul 2023 12:17
PPN:
Export:
Suche nach Titel in: TUfind oder in Google
Send an inquiry Send an inquiry

Options (only for editors)
Show editorial Details Show editorial Details