Iterative decision-aided clipping compensation and its application to scalable video transmission with multiband OFDM

Deliberate digital clipping is a simple and efficient way of controlling the peak-to-average power ratio of orthogonal frequency division multiplexing (OFDM) systems. However, a clipping is a nonlinear process that may lead to significant distortion and performance loss. An iterative time-domain decision-aided clipping compensation framework is proposed to mitigate the distortion caused by the intentional clipping with the additional constraint of out-of-band noise filtering, and it is compared with the existing frequency-domain scheme. It incorporates the simple additive distortion model and the minimum mean-square distortion (MMSD) model, with the options of hard and soft symbol estimation. Extensive simulation results are provided for the performance comparison among different schemes. The MMSD-distortion-model-based frequency-domain clipping compensation gives the best performance and is applied to scalable video transmission with a multiband OFDM. Simulations demonstrate an effective mitigation of the performance loss by the applied compensation algorithm.