Cooperation diversity for clipped OFDM with iterative reception
Thomas Ketseoglou · 2008
A realistic model for OFDM cooperation diversity is presented for Orthogonal Frequency Division Multiplexing (OFDM) systems with clipping type of nonlinearities present. The destination node processes together the received information from the source node and a single relay one (if any of the candidate relays succeeds in decoding the original OFDM packet sent). The relayed packets are the same with the direct ones (repetition coding), so that simpler receiver processing applies. The destination node applies an iterative receiver structure based on Turbo processing, in which both the channels and the clipping distortion are (iteratively) estimated. The relaying nodes receive the source-node emanating packets in a standard, non-iterative fashion, due to delay constraints. High gains are showed for the proposed system, due to the synergy between clipping distortion, channel estimation and multiple transmission paths, based on node cooperation diversity.