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dc.contributor.author安德魯en_US
dc.contributor.authorDiegoen_US
dc.contributor.author王蒞君en_US
dc.contributor.authorWang, Li-Chunen_US
dc.date.accessioned2014-12-12T01:15:17Z-
dc.date.available2014-12-12T01:15:17Z-
dc.date.issued2009en_US
dc.identifier.urihttp://140.113.39.130/cdrfb3/record/nctu/#GT009513638en_US
dc.identifier.urihttp://hdl.handle.net/11536/38485-
dc.description.abstractCurrent demand for wireless data services is growing exponentially. The wireless channel brings an unnumbered of limitations and constraints and has proved to be very expensive in some scenarios where spectrum licences can worth billions of dollars. Therefore, telecom providers around the globe are pushing the research community to come out with new technologies that can have a more efficient use of that appreciated resource. This work goes in that direction of how to affront the dilemma of achieving higher capacity systems without affecting the reliability of the link. First, we investigate a space-time code called stacked cyclic delay diversity (SCDD). Analysis of the different selection of parameters and construction of the space-time code is realized in a MIMO-OFDM channel. We discuss the diversity-multiplexing tradeoff analysis of the code and compare it with other schemes. Design and development of the MMSE linear receiver to separate the different streams is presented and performance results show that SCDD can be a promising technology. We investigate antenna configurations of 4Tx-2Rx and 4Tx-4Tx in a flat-fading channel and frequency-selective channel. The scheme shows that diversity gains can be doubled in a flat-fading channel when applying cyclic delay on the different antennas. In frequency-selective channels, gains are lower because the channel already provides some frequency-diversity to the system. Second, we develop a new scheme called stacked hybrid cyclic delay diversity (SHCDD). The purpose of this scheme is to close the gap even further between capacity and reliability in a system compared with SCDD. SHCDD can achieve non-integer rates, condition that it is not possible with SCDD. Parameter selection shows to follow similar rules than SCDD due to its similar structures. Comparison with the more widely known scheme, double space-time transmit diversity (DSTTD), is realized and shows that SHCDD can outperform DSTTD even in higher rates condition.zh_TW
dc.description.abstractCurrent demand for wireless data services is growing exponentially. The wireless channel brings an unnumbered of limitations and constraints and has proved to be very expensive in some scenarios where spectrum licences can worth billions of dollars. Therefore, telecom providers around the globe are pushing the research community to come out with new technologies that can have a more efficient use of that appreciated resource. This work goes in that direction of how to affront the dilemma of achieving higher capacity systems without affecting the reliability of the link. First, we investigate a space-time code called stacked cyclic delay diversity (SCDD). Analysis of the different selection of parameters and construction of the space-time code is realized in a MIMO-OFDM channel. We discuss the diversity-multiplexing tradeoff analysis of the code and compare it with other schemes. Design and development of the MMSE linear receiver to separate the different streams is presented and performance results show that SCDD can be a promising technology. We investigate antenna configurations of 4Tx-2Rx and 4Tx-4Tx in a flat-fading channel and frequency-selective channel. The scheme shows that diversity gains can be doubled in a flat-fading channel when applying cyclic delay on the different antennas. In frequency-selective channels, gains are lower because the channel already provides some frequency-diversity to the system. Second, we develop a new scheme called stacked hybrid cyclic delay diversity (SHCDD). The purpose of this scheme is to close the gap even further between capacity and reliability in a system compared with SCDD. SHCDD can achieve non-integer rates, condition that it is not possible with SCDD. Parameter selection shows to follow similar rules than SCDD due to its similar structures. Comparison with the more widely known scheme, double space-time transmit diversity (DSTTD), is realized and shows that SHCDD can outperform DSTTD even in higher rates condition.en_US
dc.language.isoen_USen_US
dc.subjectMIMO-OFDMzh_TW
dc.subjectCyclic Delay Diversityzh_TW
dc.subjectSpace Time codeszh_TW
dc.subjectStacked Cyclic Delay Diversityzh_TW
dc.subjectMIMO-OFDMen_US
dc.subjectCyclic Delay Diversityen_US
dc.subjectSpace Time codesen_US
dc.subjectStacked Cyclic Delay Diversityen_US
dc.title多輸入多輸出-正交分頻多工系統堆疊循環延遲天線分集技術之效能分析zh_TW
dc.titleOn the Performance of Stacked Cyclic Delay Diversity Schemes in MIMO-OFDM Systemsen_US
dc.typeThesisen_US
dc.contributor.department電信工程研究所zh_TW
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