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Transmit Antenna Selection with Imperfect CQI Feedback in OFDMA Systems

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)
Conference or Workshop Item, Bibliographie

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.

Item Type: Conference or Workshop Item
Erschienen: 2008
Creators: Kühne, Alexander ; Klein, Anja ; Wei, Xinning ; Weber, Tobias
Type of entry: Bibliographie
Title: Transmit Antenna Selection with Imperfect CQI Feedback in OFDMA Systems
Language: English
Date: August 2008
Publisher: TU Hamburg-Harburg
Book Title: Proceedings of the 13th International OFDM-Workshop (InOWo'08)
Event Title: 13th International OFDM-Workshop
Event Location: Hamburg, Germany
Event Dates: 27.-28.08.2008
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.

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: 17 Jul 2023 09:34
Last Modified: 17 Jul 2023 09:34
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