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研究生:吳彥廷
研究生(外文):WU YAUN TING
論文名稱:降低正交分頻多工系統之峰值對平均功率比
論文名稱(外文):Reduction of Peak-to-Average Power Ratio in Orthogonal Frequency Division Multiplexing System
指導教授:陳後守
指導教授(外文):Houshou Chen
學位類別:碩士
校院名稱:國立暨南國際大學
系所名稱:電機工程學系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:中文
論文頁數:79
中文關鍵詞:正交分頻多工峰值對平均功率比
外文關鍵詞:OFDMPAPR
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近幾年來多媒體無線通訊中,高速率和高品質的傳輸越來越受到人們的重視。正交分頻多工技術(OFDM)不僅符合以上特性,對於傳輸過程中多重路徑所造成的影響亦能有效地克服。但是目前對於實際實現OFDM系統仍然是相當大的挑戰。原因是OFDM系統要求的峰值對平均功率比(PAPR)很高,易造成高功率放大器產生非線性效應,導致系統整體效能降低。
在本論文我們首先介紹OFDM系統和所遭遇的峰值功率問題
,並討論各種降低PAPR技術。我們將著重於使用編碼技術來解決PAPR問題。藉由使用一階里得米勒碼某些同位集產生的格雷序列於OFDM系統中,PAPR將被限制於3 dB範圍內。但使用格雷序列的問題在於,當次載波個數越大時,碼率將越小。針對這個問題,我們提出利用X4架構重新組合格雷序列,產生一個新的OFDM碼。改善碼率過小的問題,而PAPR將被限制於6 dB範圍內。最後並探討其硬決定解碼和軟決定解碼過程。
High data rate and high quality transmission become very important in multimedia wireless communication recently. Orthogonal frequency division multiplexing (OFDM) technology not only fit the characteristic, but also has the ability to overcome the problem of multi-path propagation effectively in the process of transmission. At present it is still a difficult challenge for the practical implementation of OFDM system. One reason is that the peak-to-average power ratio (PAPR) in OFDM system is large and in turn the high power amplifier will operate in the nonlinear region. Thus, the performance of OFDM system will be reduced.
In this thesis, we first introduce the general OFDM system, study the peak power problem in OFDM system, and discuss the various PAPR reduction techniques. Then we focus on the coding methods which can overcome the PAPR problem. The PAPR of the OFDM system can be limited below 3 dB by the Golay sequences, which is obtained from the union of some cosets of first order Reed-Muller codes. The problem of using Golay sequences is when the number of sub-carries is large, the coding rate will be extremely low. To improve the coding rate we propose the X4 construction, combining the Golay sequences to generate a new OFDM code whose PAPR is limited below 6 dB. At last, we discuss the hard decision and soft decision decoding for the codes generated by the X4 construction.
第一章 前言..................................................1
第二章 正交分頻多工..........................................6
第三章 正交分頻多工系統之峰值對平均功率比...................28
第四章 應用區塊碼於峰值對平均功率比降低.....................42
第五章 使用X4架構於峰值對平均功率比降低.....................60
第六章 結論與展望...........................................76
參考文獻.....................................................77
參考文獻
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