TWI456409B - 應用於正交分頻多工系統之可降低峰均值比之計算方法 - Google Patents

應用於正交分頻多工系統之可降低峰均值比之計算方法 Download PDF

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TWI456409B
TWI456409B TW100137802A TW100137802A TWI456409B TW I456409 B TWI456409 B TW I456409B TW 100137802 A TW100137802 A TW 100137802A TW 100137802 A TW100137802 A TW 100137802A TW I456409 B TWI456409 B TW I456409B
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elite
matrix
peak
vector
average
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TW100137802A
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TW201317806A (zh
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Chih Peng Li
Jung Chieh Chen
Yi Syun Yang
Min Han Chiu
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Univ Nat Sun Yat Sen
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  1. 一種應用於正交分頻多工系統之可降低峰均值比之計算方法，其係包含以下步驟：定義一峰值S (C )，該峰值S (C )係可表示為S (C )=∥x +QC ∥∞ ，其中x 為時域資料訊號、Q為反快速傅立葉轉換矩陣、C 為降峰值子載波；提供一初始疊代參數t 、一平均值向量μ(t ) 及一共變異數矩陣Σ(t ) ，其中該初始疊代參數t=1，該平均值向量可表示為μ(t ) =[μ1(t ) ,μ2(t ) ,…,μP(t ) ]=μ(0) ，該共變異數矩陣可表示為Σ(t ) =[Σ1(t ) ,Σ2(t ) ,…ΣP(t ) ]=Σ(0) ；以一常態分布產生一P×K 之矩陣θ(t ) ，該矩陣θ(t ) 係可表示為，其中K 為總取樣數；將該矩陣θ(t ) 視為降峰值子載波C 並代入峰值S (C )之表示式中，以得到 對由小到大進行排序且決定出最佳之精英群Kelite =[ρK ]，其中ρ 為佔總取樣數之比例；對精英群進行統計運算，以分別得到一精英平均值向量及一精英共變異數矩陣，該精英平均值向量及該精英共變異數矩陣可分別表示為及，其中χ 為精英群中之集合；對精英平均值向量及精英共變異數矩陣進行平滑處理；以及判斷是否中止演算法，若演算法尚未終止則跳至以一常態分布產生一P×K 之矩陣θ(t ) 進行運算之步驟，若演算法終止則輸出精英平均值向量。
  2. 如申請專利範圍第1項所述之應用於正交分頻多工系統之可降低峰均值比之計算方法，其中在提供一初始疊代參數t 、一平均值向量μ(t ) 及一共變異數矩陣Σ(t ) 之步驟中，該平均值向量中之第p 個平均值向量可為μp(0) =[0,0]，且該共變異數矩陣中之第p 個共變異數矩陣可為。
  3. 如申請專利範圍第1項所述之應用於正交分頻多工系統之可降低峰均值比之計算方法，其中在以一常態分布產生一P×K 之矩陣θ(t ) 之步驟中，該常態分布係可為一高斯分布(Gaussian distribution)。
  4. 如申請專利範圍第1項所述之應用於正交分頻多工系統之可降低峰均值比之計算方法，其中在對精英平均值向量及精英共變異數矩陣進行平滑處理之步驟中，其係以線性平滑處理對該精英 平均值向量及該精英共變異矩陣進行更新，對該精英平均值向量作線性平滑處理之表示式為，對該精英共變異矩陣進行線性平滑處理之表示式為，其中α(0,1]為平滑參數。
  5. 如申請專利範圍第1項所述之應用於正交分頻多工系統之可降低峰均值比之計算方法，其中在判斷是否中止演算法之步驟中，其係以疊代方式以判斷演算法是否中止，疊代次數係介於10至20次。
TW100137802A 2011-10-18 2011-10-18 應用於正交分頻多工系統之可降低峰均值比之計算方法 TWI456409B (zh)

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CN106845331B (zh) * 2016-11-18 2018-03-13 深圳云天励飞技术有限公司 一种图像处理方法及终端

Citations (2)

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Publication number Priority date Publication date Assignee Title
TW200705928A (en) * 2005-04-01 2007-02-01 Ntt Docomo Inc Ip packet mapping method
EP2299641A1 (en) * 2009-09-17 2011-03-23 ST-Ericsson (France) SAS Process for estimating the channel in a OFDM communication system, and receiver for doing the same

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW200705928A (en) * 2005-04-01 2007-02-01 Ntt Docomo Inc Ip packet mapping method
EP2299641A1 (en) * 2009-09-17 2011-03-23 ST-Ericsson (France) SAS Process for estimating the channel in a OFDM communication system, and receiver for doing the same

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Luqing Wang、Chintha Tellambura, "Cross-Entropy-Based Sign-Selection Algorithms for Peak-to-Average Power Ratio Reduction of OFDM Systems", IEEE Transactions on Signal Processing, Vol. 56, NO. 10, October 2008. Jung-Chieh Chen, "Partial Transmit Sequences for Peak-to-Average Power Ratio Reduction of OFDM Signals With the Cross-Entropy Method", IEEE Signal Processing Letters, Vol. 16, NO. 6, June 2009. Jung-Chieh Chen、Chao-Kai Wen, "PAPR Reduction of OFDM Signals Using Cross-Entropy-Based Tone Injection Schemes", IEEE Signal Processing Letters, Vol. 17, NO. 8, August 2010. *

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