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正交分頻多工系統之峰均比探討

為了解決Rcf audio的問題，作者鄧尚康 這樣論述：

We propose RCFBD scheme, imposing bounded distortion~(BD) mechanism over recursive clipping and filtering~(RCF), to achieve effective peak-to-average power ratio~(PAPR) reduction for orthogonal frequency division multiplexing~(OFDM) systems while simultaneously keeping distortion under control to

reduce the penalty to error performance.We generalize RCFBD for OFDM systems consisting ofvarious types of tones. Making use of reserved tones can get effective PAPR reduction at smaller distortion bound.We propose hybrid RCFBD scheme combining ACESGP, active constellation extension~(ACE) with sm

art gradient projection~(SGP), and RCFBD so that low PAPR canbe obtained within 3 recursions and BD constraint remains intact.We investigate the mechanism of ACESGP in more detail and expose the feasibility for ACE to use the fixed step size which costs less complexity than ACESGP and presents PAPR

reduction comparable to ACESGP.We propose RPSxACE scheme to exploit the available region ofACE for BPSK/OFDM. RPSxACE imposes random phase sequence over the BPSK data so that the input data to OFDM modulator is complex-valued to get further PAPR reduction.We propose a new time-domain inter-block m

ethod, called UniTS, to involve multiple OFDM blocks together to reduce PAPR. UniTS combines unitary transform and SLM on time-shift candidates to reduce PAPR. UniTS can save almost 80 percent of the complexity of SLM in some cases. We propose a way to get a good estimate of the distributionof IPA

R for OFDM using SLM/UniTS. We also apply the derived distribution of IPAR to compute the post-clip average output power to demonstrate the effectiveness of our derivation.