Peak-to-average power ration reduction OFDM symbols
Date
2003
Authors
Carson, Neil Latimer
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Abstract
In this thesis, a new method of peak-to-average power ratio (PAPR) reduction for orthogonal frequency division multiplexed (OFDM) symbols is developed. A modified repeat-accumulate (RA) code is developed by extending the concept of selective mapping (SLM) by M. Breiling, S. Miiller-Weinfurtner and J . Huber. This new code gives the PAPR reduction of selective mapping and increases the error correcting performance due to the iterative decoding process.
Simulations were done to show the effects of number of sub-carriers, number of decoding iterations, number of encoder states, interleaver optimization and clipping. All simulations used an AWGN channel model and QPSK modulation. Results are compared to SLM and show favorable improvement with respect to error correcting performance. With the addition of clipping, the PAPR reduction is improved while the performance of the code is still maintained. Examples are also given of performance in existing OFDM systems.