Efficient embedded signaling through DCT precoding matrix for SLM method in OFDM system

Orthogonal frequency division multiplexing (OFDM) modulation technique is a promising transmission scheme for high performance broadband wireless communications. However, as a drawback, this scheme suffers from the high peak to average power ratio (PAPR) of the output signals. In order to overcome this issue, several methods requiring the transmission of side information SI bits have been proposed. The transmitted bits must be channel-encoded as they are particularly critical to the error performance of the OFDM system. This fact results in a high increase of the system complexity. Additionally, the wrong estimation of the SI leads to the damage on the total signal recovery and the loss of the entire OFDM sequence. For these reasons, we propose in this paper, a new robust technique based on selected mapping (SLM) scheme. The proposed method is based on a new form of embedded signaling such as the use of the discrete cosinus transform (DCT). Furthermore, we employ an optimized scheme during the estimation process, using the higher order statistics moments. Simulation results are given to illustrate the good performance of our proposed method and support our claim.