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Overview: This research paper presents the performance of OFDM systems with coding, spreading and clipping. Low-Density Parity-Check (LDPC) codes give coding gains and spreading by the Walsh Hadamard transform gives gains in terms of increased frequency diversity as well as reduced peak-to average power ratio (PAPR) of the transmitted OFDM signal. Reducing the PAPR is important in systems with clipping since it is related to the probability of clips. Each clip introduces clipping noise to the system which reduces the performance. It is shown that there is a gain by spreading for LDPC coded OFDM systems, especially for systems with clipping.
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