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dc.contributor.authorLai, Len_US
dc.contributor.authorYeh, Cen_US
dc.contributor.authorChang, WTen_US
dc.date.accessioned2014-12-08T15:25:54Z-
dc.date.available2014-12-08T15:25:54Z-
dc.date.issued2004en_US
dc.identifier.isbn0-7803-8255-2en_US
dc.identifier.urihttp://hdl.handle.net/11536/18348-
dc.description.abstractTwo formulations that are commonly used in the determination of the switching levels are the Torrance cost function and the Lagrangian optimization. From the Lagrangian optimization, it can be seen that the switching levels can be each separately related to the target bit error rate with the constraint that the average bit error satisfies the target bit error requirement. This provides a search direction for the optimum solution of the Torrance formulation. Also, it is verified that if the target bit error is neglected, the Torrance formulation can find the optimum solution for the possible lowest bit error rate. In this case, each switching level is only related to two adjacent modulation modes. Based on this relation, we approximate the Torrance formulation with a two-mode one-dimensional search problem. From this decomposition, we further develop a one mode cost function to evaluate the cost of using one specific modulation mode as a function of instantaneous SNR. Switching levels can be determined by simply comparing these one mode cost function.en_US
dc.language.isoen_USen_US
dc.titleSwitching level optimization for adaptive modulationen_US
dc.typeProceedings Paperen_US
dc.identifier.journalVTC2004-SPRING: 2004 IEEE 59TH VEHICULAR TECHNOLOGY CONFERENCE, VOLS 1-5, PROCEEDINGSen_US
dc.citation.spage1251en_US
dc.citation.epage1255en_US
dc.contributor.department電信工程研究所zh_TW
dc.contributor.departmentInstitute of Communications Engineeringen_US
dc.identifier.wosnumberWOS:000226279400259-
Appears in Collections:Conferences Paper