Kühne, Alexander ; Klein, Anja ; Wei, Xinning ; Weber, Tobias (2008)
Transmit Antenna Selection with Imperfect CQI Feedback in OFDMA Systems.
13th International OFDM-Workshop. Hamburg, Germany (27.-28.08.2008)
Konferenzveröffentlichung, Bibliographie
Kurzbeschreibung (Abstract)
In this paper, we analyse the impact of im- perfect Channel Quality Information (CQI) feedback on a multi-user OFDMA system which employs transmit antenna selection. As CQI, the instantaneous signal-to-noise ratio (SNR) of the different subcarriers is employed which is used at the base station to allocate the subcarriers and to select the applied modulation scheme and transmit antenna. The imperfectness of the CQI feedback arises from channel estimation errors, SNR value quantisation, feedback errors and time delays. Two different antenna selection feedback schemes are introduced, which differ in the composition of the feedback signalled to the BS. Closed form expressions for the average data rate and bit error rate (BER) are analytically derived for both schemes. Finally, the maximum achievable data rate subject to a BER constraint is analysed and the robustness against imperfect CQI is compared for both antenna selection feedback schemes.
| Typ des Eintrags: | Konferenzveröffentlichung |
|---|---|
| Erschienen: | 2008 |
| Autor(en): | Kühne, Alexander ; Klein, Anja ; Wei, Xinning ; Weber, Tobias |
| Art des Eintrags: | Bibliographie |
| Titel: | Transmit Antenna Selection with Imperfect CQI Feedback in OFDMA Systems |
| Sprache: | Englisch |
| Publikationsjahr: | August 2008 |
| Verlag: | TU Hamburg-Harburg |
| Buchtitel: | Proceedings of the 13th International OFDM-Workshop (InOWo'08) |
| Veranstaltungstitel: | 13th International OFDM-Workshop |
| Veranstaltungsort: | Hamburg, Germany |
| Veranstaltungsdatum: | 27.-28.08.2008 |
| Kurzbeschreibung (Abstract): | In this paper, we analyse the impact of im- perfect Channel Quality Information (CQI) feedback on a multi-user OFDMA system which employs transmit antenna selection. As CQI, the instantaneous signal-to-noise ratio (SNR) of the different subcarriers is employed which is used at the base station to allocate the subcarriers and to select the applied modulation scheme and transmit antenna. The imperfectness of the CQI feedback arises from channel estimation errors, SNR value quantisation, feedback errors and time delays. Two different antenna selection feedback schemes are introduced, which differ in the composition of the feedback signalled to the BS. Closed form expressions for the average data rate and bit error rate (BER) are analytically derived for both schemes. Finally, the maximum achievable data rate subject to a BER constraint is analysed and the robustness against imperfect CQI is compared for both antenna selection feedback schemes. |
| 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: | 17 Jul 2023 09:34 |
| Letzte Änderung: | 17 Jul 2023 09:34 |
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