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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
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dc.contributor.advisor | 林茂昭(Mao-Chao Lin) | |
dc.contributor.author | Yi-Ru Chen | en |
dc.contributor.author | 陳薏如 | zh_TW |
dc.date.accessioned | 2021-06-16T06:34:13Z | - |
dc.date.available | 2023-07-23 | |
dc.date.copyright | 2020-08-04 | |
dc.date.issued | 2020 | |
dc.date.submitted | 2020-07-24 | |
dc.identifier.citation | Z. Tang, R. C. Cannizzaro, G. Leus, and P. Banelli, “Pilot-assisted time-varying channel estimation for ofdm systems,” IEEE Transactions on Signal Processing, vol. 55, no. 5, pp. 2226–2238, 2007. Yang-Seok Choi, P. J. Voltz, and F. A. Cassara, “On channel estimation and detection for multicarrier signals in fast and selective rayleigh fading channels,” IEEE Transactions on Communications, vol. 49, no. 8, pp. 1375–1387, 2001. E. P. Simon and M. A. Khalighi, “Iterative soft-kalman channel estimation for fast time-varying mimo-ofdm channels,” IEEE Wireless Communications Letters, vol. 2, no. 6, pp. 599–602, 2013. T. Kashima, K. Fukawa, and H. Suzuki, “Adaptive map receiver via the em algorithm and message passings for mimo-ofdm mobile communications,” IEEE Journal on Selected Areas in Communications, vol. 24, no. 3, pp. 437–447, 2006. D. R. Morgan, “Analysis and realization of an exponentially-decaying impulse response model for frequency-selective fading channels,” IEEE Signal Processing Letters, vol. 15, pp. 441–444, 2008. Y. R. Zheng and Chengshan Xiao, “Improved models for the generation of multiple uncorrelated rayleigh fading waveforms,” IEEE Communications Letters, vol. 6, no. 6, pp. 256–258, 2002. H. Lee, C. A. Gong, and P. Chen, “A compressed sensing estimation technique for doubly selective channel in ofdm systems,” IEEE Access, vol. 7, pp. 115192–115199, 2019. B. Fornberg and J. Zuev, “The runge phenomenon and spatially variable shape parameters in rbf interpolation,” Computers Mathematics with Applications, vol. 54, no. 3, pp. 379 – 398, 2007. P. Elias, “List decoding for noisy channels,” 1957. Kwanghoon Kim and Hyuncheol Park, “A low complexity ici cancellation method for high mobility ofdm systems,” in 2006 IEEE 63rd Vehicular Technology Conference, vol. 5, pp. 2528–2532, 2006. Xiaodong Cai and G. B. Giannakis, “Bounding performance and suppressing intercarrier interference in wireless mobile ofdm,” IEEE Transactions on Communications, vol. 51, no. 12, pp. 2047–2056, 2003. K. Fang, L. Rugini, and G. Leus, “Low-complexity block turbo equalization for ofdm systems in time-varying channels,” IEEE Transactions on Signal Processing, vol. 56, no. 11, pp. 5555–5566, 2008. X. Ma, F. Yang, S. Liu, J. Song, and Z. Han, “Sparse channel estimation for mimo-ofdm systems in high-mobility situations,” IEEE Transactions on Vehicular Technology, vol. 67, no. 7, pp. 6113–6124, 2018. J. Park, Y. Whang, and K. S. Kim, “Low complexity mmse-sic equalizer employing time-domain recursion for ofdm systems,” IEEE Signal Processing Letters, vol. 15, pp. 633–636, 2008. S. Sesia, I. Toufik, and M. Baker, LTE-The UMTS Long Term Evolution: From Theory to Practice. Wiley, 2011. | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/57073 | - |
dc.description.abstract | 正交分頻多工因可有效抵抗多重路徑衰減通道,而被廣泛運用於許多通訊系統中。但在多重路徑快速衰減通道中,傳輸端及接收端有相對運動時會造成無線傳輸通道產生時變性以及都普勒效應。都普勒效應造成的頻譜擴展會讓子載波間失去正交性進而導致載波間干擾,而針對無線傳輸通道產生的時變性,一般須擺放更多引示信號來觀測載波間干擾並估測通道,因而提高單一傳輸上須乘載已知訊號的比例,降低了有效信息之比例。 在此篇論文中針對具有嚴重多普勒效應之多重路徑快速衰減通道,提出降低已知信號傳輸比例之疊代式通道估測。此疊代式通道估測利用低密度奇偶檢查碼所提供的資訊來協助估測,以利降低引示信號之數目進而提有效信息之比例。論文中也探討了碼字之長度以及擺放方式對於系統效能及估測精確度的影響。 | zh_TW |
dc.description.abstract | Because of the robustness against multipath fading channels, orthogonal frequency-division multiplexing (OFDM) is widely used in many communication systems. However, for multipath fast-fading channels, the relative movement between the transmitter and receiver results in time variation of the channel and Doppler spread. The Doppler spread resultant from the Doppler effect will degrade the orthogonality between subcarriers which in turn leads to inter-carrier interference (ICI). Conventionally, the time variation of channels with ICI requires substantial grouped-preambles for channel estimation which increases the overhead rate and decreases the effective transmission rate. In this work, we propose a novel iterative channel estimation scheme over multipath fast-fading channels with high Doppler spread, which employs error-correcting code to assist the channel estimation to lower the overhead rate and raise the effect transmission rate. We also study several arrangements of codewords including the locations and block lengths to find out the optimal arrangement according to the trade-off between the system performance and accuracy of the estimation. | en |
dc.description.provenance | Made available in DSpace on 2021-06-16T06:34:13Z (GMT). No. of bitstreams: 1 U0001-2207202019552500.pdf: 3691153 bytes, checksum: 1212de41778491d7897e86e71717f13a (MD5) Previous issue date: 2020 | en |
dc.description.tableofcontents | 致謝 i 中文摘要 ii Abstract iii Contents v List of Figures vii List of Tables ix 1 Introduction 1 2 Multipath Fast-Fading 4 2.1 Multipath Delay Spread and Coherence Bandwidth 4 2.2 Doppler Spread and Coherence Time 5 2.3 Channel Model 6 3 Coded OFDM System 10 3.1 Transceiver Overview 11 3.2 Polynomial-Basis Expansion Model 15 3.3 Frequency-Domain Equalization Techniques for ICI Mitigation 17 3.3.1 Equalization Techniques 18 3.3.2 Partial Equalization 25 3.3.3 Iterative Partial Equalization 28 4 Preamble and Codeword Arrangement 31 4.1 Pilot Tones Arrangement 31 4.2 Codeword Arrangement 35 5 Code Assisted Iterative Channel Estimation 40 5.1 Core Concept 41 5.2 Linear MMSE Based Model 44 5.3 Kalman Filter Based Model 51 6 Conclusion and Future Works 62 Bibliography 65 | |
dc.language.iso | en | |
dc.title | 在多重路徑快速衰落通道下針對正交分頻多工系統使用錯誤更正碼輔助之疊代式通道估測 | zh_TW |
dc.title | Code Assisted Iterative Channel Estimation for OFDM Systems over Multipath Fast-Fading Channels | en |
dc.type | Thesis | |
dc.date.schoolyear | 108-2 | |
dc.description.degree | 碩士 | |
dc.contributor.coadvisor | 李晃昌(Huang-Chang Lee) | |
dc.contributor.oralexamcommittee | 呂忠津(Chung-Chin Lu),趙啟超(Chi-Chao Chao),蘇育德(Yu-Ted Su) | |
dc.subject.keyword | 正交分頻多工,多重路徑快速衰減通道,載波間干擾,疊代式通道估測,低密度奇偶檢查碼, | zh_TW |
dc.subject.keyword | OFDM systems,multi-path fast-fading channels,inter-carrier interference,iterative channel estimation,LDPC codes, | en |
dc.relation.page | 67 | |
dc.identifier.doi | 10.6342/NTU202001753 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2020-07-24 | |
dc.contributor.author-college | 電機資訊學院 | zh_TW |
dc.contributor.author-dept | 電信工程學研究所 | zh_TW |
顯示於系所單位: | 電信工程學研究所 |
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