Limited Feedback for MISO-OFDM Systems

Konferenz: OFDM 2012 - 17th International OFDM Workshop 2012 (InOWo'12)
29.08.2012-30.08.2012 in Essen, Germany

Tagungsband: OFDM 2012

Seiten: 4Sprache: EnglischTyp: PDF

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Zhao, Bo; Akbudak, Tarik; Simsek, Meryem; Czylwik, Andreas (University of Duisburg-Essen, Bismarckstrasse 81, Duisburg, Germany)
Xu, Haomiao (North China Institute of Science and Technology, Yanjiao, China)

A multiple input single output orthogonal frequency division multiplexing (MISO-OFDM) system with feedback-based transmit beamforming is investigated. Since existing algorithms do not take frequency and temporal correlation of the channel transfer function into account simultaneously, we propose to use a resource block (RB)-based feedback structure which utilizes both types of correlation on a RB basis. This method spends a few more bits on the first OFDM symbol in a RB and dramatically reduces the overall feedback overhead by exploiting temporal and frequency correlation. The RB-based algorithm is also shown to be able to restrain the SNR loss due to quantization of the optimal beamformer. Index Terms — Limited feedback, MISO-OFDM, transmit beamforming, RB-based encoding.