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
Artikel, Bibliographie
Kurzbeschreibung (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.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2008 |
| Autor(en): | Kühne, Alexander ; Klein, Anja |
| Art des Eintrags: | Bibliographie |
| Titel: | Throughput Analysis of Multi-User OFDMA-Systems using Imperfect CQI Feedback and Diversity Techniques |
| Sprache: | Englisch |
| Publikationsjahr: | 10 Oktober 2008 |
| Verlag: | IEEE |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | IEEE Jounal on Selected Areas in Communications |
| Jahrgang/Volume einer Zeitschrift: | 26 |
| (Heft-)Nummer: | 10 |
| DOI: | 10.1109/JSAC.2008.081010 |
| Kurzbeschreibung (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. |
| Fachbereich(e)/-gebiet(e): | 18 Fachbereich Elektrotechnik und Informationstechnik 18 Fachbereich Elektrotechnik und Informationstechnik > Institut für Nachrichtentechnik 18 Fachbereich Elektrotechnik und Informationstechnik > Institut für Nachrichtentechnik > Kommunikationstechnik |
| Hinterlegungsdatum: | 11 Jul 2023 12:17 |
| Letzte Änderung: | 11 Jul 2023 12:17 |
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