(The) BER performance improvement for IDMA systems in overloaded environmentsOverloaded 환경에서 IDMA 시스템의 성능 개선

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dc.contributor.advisorPark, Hyun-Cheol-
dc.contributor.advisor박현철-
dc.contributor.authorHeo, Un-Jung-
dc.contributor.author허운정-
dc.date.accessioned2011-12-14T02:29:39Z-
dc.date.available2011-12-14T02:29:39Z-
dc.date.issued2010-
dc.identifier.urihttp://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=419183&flag=dissertation-
dc.identifier.urihttp://hdl.handle.net/10203/40111-
dc.description학위논문(석사) - 한국과학기술원 : 정보통신공학과, 2010.2, [ vii, 31 p. ]-
dc.description.abstractThis thesis proposes a modified multiuser iterative detection for synchronous uncoded IDMA system using the scaling factor at the receiver. The existing IDMA receiver feeds back the extrinsic log-likelihood ratios (LLRs) to multiuser detector to improve its estimates in the next iteration. In overloaded scenarios especially where the number of users is greater than the maximum number of users supported in fixed spreading length, the degradation of the performance is caused by increased interferences. However, the proposed iterative multiuser detection provides better estimates based on the extrinsic LLRs manipulated by the scaling factor. Simulation results show that the proposed scheme compensates the degradation of BER performance of IDMA system without additional iterations, compared to the existing iterative multiuser detection scheme.eng
dc.languageeng-
dc.publisher한국과학기술원-
dc.subjectthe number of users-
dc.subjectspreading factor-
dc.subjectIDMA-
dc.subjectOverloaded Scenario-
dc.subjectiterative receiver-
dc.subject반복 수신기-
dc.subject사용자 수-
dc.subject확산 계수-
dc.subject인터리버 분할 다중 접속-
dc.subject과부하 환경-
dc.title(The) BER performance improvement for IDMA systems in overloaded environments-
dc.title.alternativeOverloaded 환경에서 IDMA 시스템의 성능 개선-
dc.typeThesis(Master)-
dc.identifier.CNRN419183/325007 -
dc.description.department한국과학기술원 : 정보통신공학과, -
dc.identifier.uid020074339-
dc.contributor.localauthorPark, Hyun-Cheol-
dc.contributor.localauthor박현철-
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