Complexity Reduction and Ambiguity Resolution of Blind Data Detector in SFBC-OFDM Systems
碩士 === 國立中山大學 === 通訊工程研究所 === 102 === In this research, a low-complexity blind data detector scheme for orthogonal frequency division multiplexing (OFDM) system is proposed, where the generalized likelihood ratio test (GLRT) approach is adopted. The traditional GLRT data detector (GDD) suffers from...
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ndltd-TW-102NSYS56501032019-05-15T21:32:51Z http://ndltd.ncl.edu.tw/handle/d98xd7 Complexity Reduction and Ambiguity Resolution of Blind Data Detector in SFBC-OFDM Systems 在空頻區塊編碼正交分頻多工系統中盲式資料估測器之複雜度降低與模糊性解決 Tang-wen Cheng 鄭唐文 碩士 國立中山大學 通訊工程研究所 102 In this research, a low-complexity blind data detector scheme for orthogonal frequency division multiplexing (OFDM) system is proposed, where the generalized likelihood ratio test (GLRT) approach is adopted. The traditional GLRT data detector (GDD) suffers from prohibitively high computational complexity since all the subcarriers are jointly considered. Therefore, previous studies proposed a sub-group GDD (SGDD) by progressively dealing with a subgroup of subcarriers at one time. It is shown that, the unique solution of SGDD is guaranteed if the size of sub-group is larger than the order of channel impulse response (CIR). In this study, we proved that the size of SGDD can be even smaller than the channel order if the partition meets some requirements. Furthermore, the proposed partition method is extended to SFBC-based MIMO-OFDM systems. It is worth noting that, most of the SFBC, including Alamouti-SFBC, are rotatable, which leads to a code ambiguity. In this research, we introduce an asymmetric modulation to solve this problem. Simulation results show that the computational complexity is significantly reduced by adopting this novel sub-carrier partition scheme. In addition, the code ambiguity and sign ambiguity, which require extra pilot symbols in existing literatures, can be simultaneously solved by our proposed asymmetric modulation without sacrificing any bandwidth efficiency. Chih-Peng Li 李志鵬 2014 學位論文 ; thesis 55 zh-TW |
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碩士 === 國立中山大學 === 通訊工程研究所 === 102 === In this research, a low-complexity blind data detector scheme for orthogonal frequency division multiplexing (OFDM) system is proposed, where the generalized likelihood ratio test (GLRT) approach is adopted. The traditional GLRT data detector (GDD) suffers from prohibitively high computational complexity since all the subcarriers are jointly considered. Therefore, previous studies proposed a sub-group GDD (SGDD) by progressively dealing with a subgroup of subcarriers at one time. It is shown that, the unique solution of SGDD is guaranteed if the size of sub-group is larger than the order of channel impulse response (CIR). In this study, we proved that the size of SGDD can be even smaller than the channel order if the partition meets some requirements. Furthermore, the proposed partition method is extended to SFBC-based MIMO-OFDM systems. It is worth noting that, most of the SFBC, including Alamouti-SFBC, are rotatable, which leads to a code ambiguity. In this research, we introduce an asymmetric modulation to solve this problem. Simulation results show that the computational complexity is significantly reduced by adopting this novel sub-carrier partition scheme. In addition, the code ambiguity and sign ambiguity, which require extra pilot symbols in existing literatures, can be simultaneously solved by our proposed asymmetric modulation without sacrificing any bandwidth efficiency.
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author2 |
Chih-Peng Li |
author_facet |
Chih-Peng Li Tang-wen Cheng 鄭唐文 |
author |
Tang-wen Cheng 鄭唐文 |
spellingShingle |
Tang-wen Cheng 鄭唐文 Complexity Reduction and Ambiguity Resolution of Blind Data Detector in SFBC-OFDM Systems |
author_sort |
Tang-wen Cheng |
title |
Complexity Reduction and Ambiguity Resolution of Blind Data Detector in SFBC-OFDM Systems |
title_short |
Complexity Reduction and Ambiguity Resolution of Blind Data Detector in SFBC-OFDM Systems |
title_full |
Complexity Reduction and Ambiguity Resolution of Blind Data Detector in SFBC-OFDM Systems |
title_fullStr |
Complexity Reduction and Ambiguity Resolution of Blind Data Detector in SFBC-OFDM Systems |
title_full_unstemmed |
Complexity Reduction and Ambiguity Resolution of Blind Data Detector in SFBC-OFDM Systems |
title_sort |
complexity reduction and ambiguity resolution of blind data detector in sfbc-ofdm systems |
publishDate |
2014 |
url |
http://ndltd.ncl.edu.tw/handle/d98xd7 |
work_keys_str_mv |
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