並列摘要
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 of various 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 smart gradient projection~(SGP), and RCFBD so that low PAPR can be 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 of ACE 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 method, 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 distribution of IPAR 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.
參考文獻
延伸閱讀
- Hung, Y. C. (2014). 正交分頻多工架構應用於多輸入多輸出系統之 峰均值分析與序列設計 [doctoral dissertation, National Chiao Tung University]. Airiti Library. https://doi.org/10.6842/NCTU.2014.00139
- Liu, H. J. (2005). 於峰均值功率比條件下分散式正交分頻多工系統之功率分配 [master's thesis, National Taiwan University]. Airiti Library. https://doi.org/10.6342/NTU.2005.03061
- Liu, Y. C. (2016). 在正交分頻多工系統中以特意位元翻轉與錯誤更正碼降低峰均比之研究 [doctoral dissertation, National Taiwan University]. Airiti Library. https://doi.org/10.6342/NTU201601446
- Pan, C. Y. (2014). A Study on PAPR Reduction Methods for OFDM Signals [master's thesis, National Chiao Tung University]. Airiti Library. https://doi.org/10.6842/NCTU.2014.00749
- Yang, T. C. (2004). PAPR Reduction for Coded OFDM Systems [master's thesis, National Taiwan University]. Airiti Library. https://doi.org/10.6342/NTU.2004.10033