Abstract
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.
Original language | English |
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Pages (from-to) | 756-765 |
Number of pages | 10 |
Journal | IEEE Transactions on Vehicular Technology |
Volume | 56 |
Issue number | 2 |
DOIs | |
Publication status | Published - Mar 2007 |
Externally published | Yes |
Keywords
- Digital clipping
- Iterative cancellation
- Iterative compensation
- Iterative reconstruction
- Multiband orthogonal frequency division multiplexing (OFDM)
- OFDM
- Scalable video