在使用類正交空頻區塊碼(Quasi-Orthogonal Space Frequency Block Code, QOSFBC)之多輸入多輸出(Multiple-Input Multiple-Output, MIMO)正交分頻多工(Orthogonal Frequency Division Multiplexing, OFDM)系統，峰均值功率比(Peak-to-Average Power Ratio, PAPR)是其中一個主要的缺點，選擇性映射(Selected Mapping, SLM)是一個常見用於降低PAPR的方法，其降低PAPR的效能非常好，但是需要額外傳送旁帶訊息(Side Information, SI)給接收端，這樣會造成傳輸速率的降低，而且SLM之運算複雜度非常高。本論文中，我們提出了兩種用於類正交空頻區塊碼之多輸入多輸出正交分頻多工系統中降低峰均值比的方法，分別在頻域上和時域上產生候選訊號(Candidate Signal)。此外，這兩種方法都不需要額外傳送旁帶訊息給接收端，利用我們提出的偵測方法，可以在接收端得知旁帶訊息。根據模擬結果，提出的方法能有效降低PAPR，在接收端也能成功解出旁帶訊息。因此，系統的位元錯誤率(Bit Error Rate, BER)可以近於完美已知旁帶訊息時的效能。

A high peak-to-average power ratio (PAPR) is one of drawbacks in quasi-orthogonal space block code (QOSFBC) multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) systems. Selected mapping (SLM) method is a well-known method that can reduce PAPR significantly. However, it requires transmitting side information (SI) to the receiver, which causes degradation in the date rate. In addition, the computational complexity of the SLM method is extremely high. In this thesis, two PAPR reduction schemes without SI are proposed for the QOSFBC MIMO OFDM system, where the candidate signals are generated in the frequency and time domains. With the use of the proposed SI detection algorithm, the SI can be detected successfully at the receiver. Simulation results show the proposed schemes reduce the PAPR effectively. In addition, the side information can be successfully obtained at the receiver. Therefore, the bit error rate of the proposed schemes with the proposed SI detection algorithm is close to that of the case in which the SI is perfectly known at the receiver.

論文審定書 i
誌謝 ii
中文摘要 iii
Abstract iv
目錄 v
圖次 vii
表次 viii
第一章 導論 1
1.1 研究背景 1
1.2 研究動機 2
1.3 論文架構 3
第二章 系統模型 4
2.1 正交分頻多工系統之基本架構 4
2.2 正交分頻多工系統訊號之峰均值功率比 7
2.3 類正交空頻區塊碼及多輸入多輸出 9
第三章 多根天線下降低PAPR的方法 12
3.1 傳統的SLM 12
3.2 Original SLM和Simplified SLM 14
第四章 不具旁訊息傳送的降低PAPR方法 16
4.1 頻域上產生候選信號的方法 17
4.2 時域上產生候選信號的方法 23
第五章 接收機的設計 28
5.1 傳送功率的標準化 28
5.2 偵測旁帶訊息 29
第六章 模擬結果與討論 31
6.1 複雜度分析 31
6.2 PAPR效能分析 32
6.3 旁帶訊息的偵測機率 34
6.4 系統的錯誤率 35
第七章 結論 38
參考文獻 39
中英對照表 44
縮寫對照表 49

Y. Wu and W. Y. Zou, “Orthogonal frequency division multiplexing: a multi-carrier modulation scheme,” IEEE Trans. Consum. Electron., vol. 41, no. 3, pp. 392–399, Aug. 1995.
H.-C. Wu, “Analysis and characterization of intercarrier and interblock interferences for wireless mobile OFDM systems,” IEEE Trans. Broadcast., vol. 52, no. 2, pp. 203–210, June 2006.
S. H. Han and J. H. Lee, “An overview of peak-to-average power ratio reduction techniques for multicarrier transmission,” IEEE Trans. Wireless Commun., vol. 12, pp. 56–65, Apr. 2005.
T. Jiang and Y. Wu, “An overview: peak-to-average power ratio reduction techniques for OFDM signals,” IEEE Trans. Broadcast., vol. 54, no. 2, pp. 257–268, June 2008.
M.-S. Baek, M.-J. Kim, Y.-H. You, and H.-K. Song, “Semi-blind channel estimation and PAPR reduction for MIMO-OFDM system with multiple antennas,” IEEE Trans. Broadcast., vol. 50, no. 4, pp. 414–424, Dec. 2004.
C.-P. Li, S.-H. Wang, and C.-L. Wang, “Novel low-complexity SLM schemes for PAPR reduction in OFDM systems,” IEEE Trans. Signal Process., vol. 58, no. 5, pp. 2916–2921, May 2010.
C.-P. Li, S.-H. Wang, and K.-C. Chan, “Low complexity transmitter architectures for SFBC MIMO-OFDM systems,” IEEE Trans. Commun., vol. 60, no. 6, pp. 1712–1718, June 2012.
M. F. Naeiny and F. Marvasti, “Selected mapping algorithm for PAPR reduction of space-frequency coded OFDM systems without side information,” IEEE Trans. Veh. Technol., vol. 60, no. 3, pp. 1211–1216, Mar. 2011.
V. Tarokh and H. Jafarkhani, “On the computation and reduction of the peak-to-average power ratio in multicarrier communication,” IEEE Trans. Commun., vol. 48, no. 1, pp. 37–44, Jan. 2000.
H. Jafarkhani, “A quasi-orthogonal space-time block code,” IEEE Trans. Commun., vol. 49, no. 1, pp. 1–4, Jan. 2001.
Z. Chen and M. H. Lee, “One bit feedback for quasi-orthogonal space-time block codes based on circulant matrix,” IEEE Trans. Wireless Commun., vol. 8, no.7, pp. 3386–3389, July 2009.
W.-W. Hu, C.-P. Li, and J.-C. Chen, “Peak power reduction for pilot-aided OFDM systems with semi-blind detection,” IEEE Commun. Lett., vol. 16, no. 7, pp. 1056–1059, July 2012.
R. W. Ba ̈uml, R. F. H. Fischer, and J. B. Huber, “Reducing the peak-to-average power ratio of multicarrier modulation by selected mapping,” Electron. Lett., vol. 32, no. 22, pp. 2056–2057, Oct. 1996.
X. Li and L. J. Cimini, “Effects of clipping and filtering on the performance of OFDM,” IEEE Commun. Lett., vol. 2, no. 5, pp. 131–133, May 1998.
J. Armstrong, “Peak-to-average reduction for OFDM by repeated clipping and frequency domain filtering,” IET Electron. Lett., vol. 38, no. 5, pp. 246–247, Feb. 2002.
X. Huang, J. H. Lu, J. L. Zheng, K. B. Letaief, and J. Gu, “Companding transform for reduction in peak-to-average power ratio of OFDM signals,” IEEE Trans. Wireless Commun., vol. 3, no. 6, pp. 2030–2039, Nov. 2004.
S. G. Kang, J. G. Kim, and E. K. Joo, “A novel subblock partition scheme for partial transmit sequence OFDM,” IEEE Trans. Commun., vol. 45, no. 9, pp. 333–338, Sep. 1999.
W.-W. Hu, Y.-C. Ciou, C.-P. Li, and W.-J. Huang, “PAPR reduction scheme in SFBC MIMO-OFDM system without side information,” in Proc. IEEE ICC., pp. 4708–4712, June 2013.
J. S. Wang, S. H. Hwang, I. Song, and Y. H. Kim, “Reduction of PAPR without side information for frequency switched transmit diversity-based MIMO-OFDM systems,” IEEE Commun. Lett., vol. 14, no. 12, pp. 1116–1118, Dec. 2010.
W.-C. Huang, C.-P. Li, and H.-J. Li, “On the power allocation and system capacity of OFDM systems using superimposed training schemes,” IEEE Trans. Veh. Technol., vol. 58, no. 4, pp. 1731–1740, May 2009.
S. Y. L. Goff, B. K. Khoo, C. C. Tsimenidis, and B. S. Sharif, “Selected mapping without side information for PAPR reduction in OFDM,” IEEE Trans. Wireless Commun., vol. 8, no. 7, pp. 3320–3325, July 2009.
J.-C. Chen and C.-P. Li, “Tone reservation using near-optimal peak reduction tone set selection algorithm for PAPR reduction in OFDM systems,” IEEE Signal Process. Lett., vol. 17, no. 11, pp. 933–936, Nov. 2010.
S. He and M. Torkelson, “Computing partial DFT for comb spectrum evaluation,” IEEE Signal Process. Lett., vol. 3, no. 6, pp. 173–175, June 1996.
M. Breiling, S. H. Muller, and J. B. Huber, “SLM peak-power reduction with explicit side information,” IEEE Commun. Lett., vol. 5, no. 6, pp. 239–241, June 2001.
S.-H. Wang, J.-C. Sie, C.-P. Li, and Y.-F. Chen, “A low-complexity PAPR reduction scheme for OFDMA uplink systems,” IEEE Trans. Wireless Commun., vol. 10, no. 4, pp. 1242–1251, Apr. 2011.
S. M. Alamouti, “A simple transmit diversity technique for wireless communications.,” IEEE J. Sel. Areas Commun., vol. 16, no. 8, pp. 1451–1458, Oct. 1998.
W.-C. Huang, C.-P. Li, and H.-J. Li, “Optimal pilot sequence design for channel estimation in CDD-OFDM systems,” IEEE Trans. Wireless Commun., vol. 11, no. 11, pp. 4006–4016, Nov. 2012.
V. Tarokh, H. Jafarkhani, and A. R. Calderbank, “Space-time block codes from orthogonal designs,” IEEE Trans. Inform. Theory, vol. 45, no. 5, pp. 1456–1467, July 1999.
S.-H. Wang and C.-P. Li, “A low-complexity PAPR reduction scheme for SFBC MIMO-OFDM systems,” IEEE Signal Process. Lett., vol. 16, no. 11, pp. 941–944, Nov. 2009.
A. D. S. Jayalath and C. Tellambura, “SLM and PTS peak-power reduction of OFDM signals without side information,” IEEE Trans. Wireless Commun., vol. 4, no. 5, pp. 2006–2013, Sep. 2005.
W.-C. Huang, Y.-S. Yang, C.-P. Li, and H.-J. Li, “A new pilot architecture for sub-band uplink OFDMA systems,” IEEE Trans. Broadcast., vol. 59, no. 3, pp. 461–470, June 2013.
P. H. Moose, “A technique for orthogonal frequency division multiplexing frequency offset correction,” IEEE Trans. Commun., vol. 42, no. 10, pp. 2908–2914, Oct. 1994.
D.-W. Lim, J.-S. No, C.-W. Lim, and H. Chung, “A new SLM OFDM scheme with low complexity for PAPR reduction,” IEEE Signal Process. Lett., vol. 12, no. 2, pp. 93–96, Feb. 2005.
C.-P. Li, and W.-W. Hu, “Super-imposed training scheme for timing and frequency synchronization in OFDM systems,” IEEE Trans. Broadcast., vol. 53, issue 2, pp. 574–583, June 2007.
J.-C. Chen, M.-H. Chiu, Y.-S. Yang, and C.-P. Li, “A suboptimal tone reservation algorithm based on cross-entropy method for PAPR reduction in OFDM systems,” IEEE Trans. Broadcast., vol. 57, no. 3, pp. 752–756, Sep. 2011.
L. Yang, K. K. Soo, Y. M. Siu, and S. Q. Li , “A low complexity selected mapping scheme by use of time domain sequence superposition technique for PAPR reduction in OFDM system,” IEEE Trans. Broadcast., vol. 54, no. 4, pp. 821–824, Dec. 2008.
A. Ghassemi and T. A. Gulliver, “Partial selective mapping OFDM with low complexity IFFTs,” IEEE Commun. Lett., vol. 12, no. 1, pp. 4–6, Jan. 2008.
S. Y. Le Goff, B. K. Khoo, C. C. Tsimenidis, and B. S. Sharif, “A novel selected mapping technique for PAPR reduction in OFDM systems,” IEEE Trans. Commun., vol. 56, no. 11, pp. 1775–1779, Nov. 2008.
W.-C. Huang, C.-P. Li, and H.-J. Li, “An investigation into the noise variance and the SNR estimators in imperfectly-synchronized OFDM systems,” IEEE Trans. Wireless Commun., vol. 9, no. 3, pp. 1159–1167, Mar. 2010.