Institute of Electrical & Electronic Engineers
The high envelope fluctuations of OFDM signals (Orthogonal Frequency Division Multiplexing) make them very prone to nonlinear distortion effects. In typical OFDM implementations the nonlinear distortion component is regarded as a noise-like term that leads to performance degradation. To achieve optimum performance the authors should employ a ML (Maximum Likelihood) receiver where they take into account all the information associated to the transmitted signals that is in the non-linearly-distorted signal. Although the performance of an ML is substantially better than traditional receivers, its complexity is prohibitively high. In this paper, they consider nonlinearly distorted OFDM schemes and they present sub-optimum receivers that try to approach the ML performance.