摘要
为了克服正交频分复用 (Orthogonal frequency division multiplexing,OFDM)信号的高峰均比问题 ,本文研究了基于单正交映射的部分传输序列 (Partial transmitsequences,PTS)算法及其在信号过采样形式中的应用 ,发现信号过采样会造成单正交映射的相位优化复杂度呈二次增长。借助于 Monte-Carlo仿真 ,证明了在单正交映射过程中会产生大量的冗余。通过改变正交映射方式和删除冗余 ,提出了一种新的 PTS快速相位优化算法。分析和实验结果表明 ,该算法能较大程度地减小运算复杂度 。
The scheme of orthogonal projection-based (O P) partial transmit sequences (PTS) is used to solve the problem of high peak-t o-average power ratio (PAPR), i.e., one of the major drawbacks of orthogonal fr equency division multiplexing (OFDM). Since the PAPR of the PTS signal is sample d at Nyquist rate regrows dramatically, oversampling is needed. However, the com plexity of OP-PTS is increased quadratically when OFDM signal is oversampled. I t is proved that abundant redundancies exist in phase optimization by Monte-Car lo method. By eliminating redundancies and modifying orthogonal projection proce ss, a new scheme with low complexity is proposed. Analysis and simulation result s show that the method can reduce the computation complexity, thus obtaining the good performance of PAPR reduction.
出处
《南京航空航天大学学报》
EI
CAS
CSCD
北大核心
2005年第1期57-60,共4页
Journal of Nanjing University of Aeronautics & Astronautics
关键词
正交频分复用
部分传输序列
峰均比
正交映射
orthogonal frequency division multiplexing (OFDM )
partial transmit sequences(PTS)
peak-to-average power ratio(PAPR)
ortho gonal projection
