Hybrid one-/two-way transmission scheme for bidirectional multi-user relaying under asymmetric rate requirements

Conference: OFDM 2012 - 17th International OFDM Workshop 2012 (InOWo'12)
08/29/2012 - 08/30/2012 at Essen, Germany

Proceedings: OFDM 2012

Pages: 7Language: englishTyp: PDF

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Degenhardt, Holger; Klein, Anja (Institute of Telecommunications, Communications Engineering Lab, Technische Universit├Ąt Darmstadt, Merckstr. 25, 64283 Darmstadt, Germany)

A single cell scenario consisting of a multiantenna base station and several single antenna mobile stations is considered. An intermediate non-regenerative multi-antenna relay station is used to support the bidirectional communications. In such a scenario, the required data rates for up- and downlink are typically different which is considered by introducing asymmetric rate requirements. A transmission via multiple orthogonal subcarriers as used in OFDM is investigated and a hybrid one-/twoway transmission scheme per subcarrier is proposed to increase the achievable sum rates under the asymmetric rate requirements. To handle the asymmetric rate requirements at the relay station, a weighted self-interference aware relay transceive filter per subcarrier is applied. Furthermore, different transmit and receive filter strategies at the base station are investigated. Performance results show that higher sum rates can be achieved with the hybrid one-/two-way relaying scheme than via a pure two-way relaying scheme.