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dc.contributor.authorLin, YNen_US
dc.contributor.authorLin, DWen_US
dc.date.accessioned2014-12-08T15:19:17Z-
dc.date.available2014-12-08T15:19:17Z-
dc.date.issued2005-05-01en_US
dc.identifier.issn0018-9545en_US
dc.identifier.urihttp://dx.doi.org/10.1109/TVT.2005.844654en_US
dc.identifier.urihttp://hdl.handle.net/11536/13784-
dc.description.abstractWe present a unified performance analysis for the conventional bit-interleaved direct-sequence (DS) code-division multiple access (BIDS-CDMA) and the more recently proposed chip-interleaved DS-CDMA (CIDS-CDMA), both with channel coding. Simple CIDS-CDMA treats a set of bits at a time and interleaves their chips together for transmission. But bit interleaving may also be used on top of chip interleaving (thus abbreviated BCIDS-CDMA) to enhance performance. For simplicity, we first tackle flat-faded synchronous transmission, in which we treat both the condition with perfect power control and that where the received signal is subject to Rayleigh fading. We then extend the analysis to asynchronous and multipath channels, with the latter treated only briefly. By approximating the correlation among the spreading codes (rather than the ensuing interference) as Gaussian, we obtain novel and relatively simple results for the various conditions above. In general, BCIDS-CDMA performs best, followed by simple CIDS-CDMA and then by BIDS-CDMA. Within simple CIDS-CDMA and BIDS-CDMA, long-code spreading performs better than short-code spreading. For BCIDS-CDMA with perfect interleaving that fully randomizes the fading coefficients, the performance is not affected by the spreading code period. The above ordering of performance follows the amount of diversity each scheme exploits, where the diversity may come from spectrum spreading, channel coding, and independence in fading of different paths. Simulation results agree well with the theoretical analysis.en_US
dc.language.isoen_USen_US
dc.subjectbit interleavingen_US
dc.subjectchip interleavingen_US
dc.subjectconvolutional codesen_US
dc.subjectdirect-sequence code-division multiple access (DS-CDMA) performanceen_US
dc.titleNovel analytical results on performance of bit-interleaved and chip-interleaved DS-CDMA with convolutional codingen_US
dc.typeArticleen_US
dc.identifier.doi10.1109/TVT.2005.844654en_US
dc.identifier.journalIEEE TRANSACTIONS ON VEHICULAR TECHNOLOGYen_US
dc.citation.volume54en_US
dc.citation.issue3en_US
dc.citation.spage996en_US
dc.citation.epage1012en_US
dc.contributor.department電子工程學系及電子研究所zh_TW
dc.contributor.department電信研究中心zh_TW
dc.contributor.departmentDepartment of Electronics Engineering and Institute of Electronicsen_US
dc.contributor.departmentCenter for Telecommunications Researchen_US
dc.identifier.wosnumberWOS:000229254800024-
dc.citation.woscount3-
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