Coded Cooperation Diversity for Uncoded Oversampled OFDM Systems

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 OFDM systems, in which implementation of cooperation is provided by the oversampling potential in OFDM, instead of using extra channel coding. In fact, zeropadding followed by IFFT in OFDM is similar to oversampling and could be an alternative to correction codes. Furthermore, we use this oversampling to implement the iterative receiver at the partner terminal. This receiver works base on the nonuniform sampling theorem for reconstructing of lost symbols. The lost symbols appear at the partner terminal due to dividing of each OFDM block into the two segments through the puncturing at the user terminal. 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.

Keywords:

Coded Cooperation Diversity , Orthogonal Frequency Division Multiplexing (OFDM) , Oversampling , Iterative Reconstruction Method