DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Kim, Hyung-Myung | - |
dc.contributor.advisor | 김형명 | - |
dc.contributor.author | Jung, Hye-Jung | - |
dc.contributor.author | 정혜정 | - |
dc.date.accessioned | 2011-12-14T01:47:28Z | - |
dc.date.available | 2011-12-14T01:47:28Z | - |
dc.date.issued | 2001 | - |
dc.identifier.uri | http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=165444&flag=dissertation | - |
dc.identifier.uri | http://hdl.handle.net/10203/37396 | - |
dc.description | 학위논문(석사) - 한국과학기술원 : 전기및전자공학전공, 2001.2, [ v, 44 p. ] | - |
dc.description.abstract | In this thesis we propose and analyze a method of estimating the channel transfer function for orthogonal frequency division multiplexing-code division multiple access (OFDM-CDMA) systems under slowly time-variant radio channel conditions. The proposed channel estimation method is based on pilot symbols inserted both in time and frequency domains and a truncated DFT-zero padding interpolation algorithm. Owing to the low-pass filtering in a transform domain, additive white Gaussian noise in the received pilot signals is reduced considerably. The optimal cut-off frequency of the transform domain filter is selected according to the number of multipaths. After the truncated DFT-zero padding interpolation in the frequency domain, we also apply it to the time domain to obtain the time-variant channel response in each subchannel. We present analytical expressions of mean-squared error (MSE) for various interpolation methods. The proposed channel estimator not only qualifies the MSE performance comparable to that of linear minimum mean-squared error (LMMSE) estimator without knowing channel correlation but also has much lower computational complexity. Computer simulations over Rayleigh fading channels demonstrate an improvement in $E_b$/$N_o$ for same bit error rate (BER). | eng |
dc.language | eng | - |
dc.publisher | 한국과학기술원 | - |
dc.subject | OFDM-CDMA | - |
dc.subject | channel estimation | - |
dc.subject | pilot symbol | - |
dc.subject | 직교 주파수 분할 다중화-부호분할 다중접속 시스템 | - |
dc.subject | 채널 추정 | - |
dc.subject | truncated DFT-zero padding interpolation | - |
dc.subject | fading channel | - |
dc.title | (A) channel estimation method for OFDM-CDMA systems in fading channels | - |
dc.title.alternative | 감쇄채널 환경에서 직교 주파수 분할 다중화-부호분할 다중접속 시스템을 위한 채널 추정 기법 | - |
dc.type | Thesis(Master) | - |
dc.identifier.CNRN | 165444/325007 | - |
dc.description.department | 한국과학기술원 : 전기및전자공학전공, | - |
dc.identifier.uid | 000993513 | - |
dc.contributor.localauthor | Kim, Hyung-Myung | - |
dc.contributor.localauthor | 김형명 | - |
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