A Study on PAPR of OFDM Systems
Date Issued
2007
Date
2007
Author(s)
Deng, Shang-Kang
DOI
en-US
Abstract
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.
Subjects
正交分頻多工
功率峰均比
剪除及濾波
失真限制
主動式星座延展
多選式映射
么正轉換結合時移多選
OFDM:PAPR
RCF
RCFBD
ACESGP
SLM
UniTS
Type
thesis
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