Coded cooperation diversity for uncoded oversampled OFDM systems

Authors:
Alireza Rahmati;Paeiz Azmi
Affiliations:
Electrical and Computer Engineering Department, Tarbiat Modares University, Tehran, Iran;Electrical and Computer Engineering Department, Tarbiat Modares University, Tehran, Iran
Venue:
Signal Processing
Year:
2009

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Abstract

Recently, user-cooperation diversity has been introduced as an effective scheme that can bring about antenna diversity in wireless networks. In this paper, we introduce a coded cooperation diversity technique for single antenna uncoded orthogonal frequency division multiplexing (OFDM) systems, in which implementation of coded cooperation is provided by the oversampling potential in OFDM, instead of using extra channel coding. In fact, zero-padding followed by IFFT in OFDM is similar to oversampling and could be an alternative to applying correction codes. Furthermore, we use this oversampling to implement an iterative receiver at the partner terminal. This receiver works based on the nonuniform sampling theorem for reconstructing of lost symbols. The lost symbols appear at the partner terminal of cooperative network because of dividing each OFDM block into two segments through the puncturing at the user terminal of the cooperative network. We provide simulation results for our proposed scenario, and observe significant gains over the non-cooperative oversampled OFDM systems without any need whatever for using extra channel coding.