东华大学学报(英文版)
東華大學學報(英文版)
동화대학학보(영문판)
JOURNAL OF DONGHUA UNIVERSITY
2004年
1期
72-77
,共6页
左健存%宋文涛%罗汉文%徐友云
左健存%宋文濤%囉漢文%徐友雲
좌건존%송문도%라한문%서우운
Dual adaption%Turbo coded modulation%Fading channels%Multimedia services%Spectral efficiency
This paper proposes a cross-layer dual adaptive coded modulation architecture using turbo codes for mobile multimedia communication, which adapts to both the varying channel characteristics and the QoS of various multimedia services simultaneously to increase the average system throughput substantially. A pragmatic channeladaptive turbo coded modulation scheme, which comes within 2.5 Db of the Shannon limit, is optimally designed,and then a QoS-adaptive scheme is superimposed to build the dual adaptive architecture. Simulation results show that the novel dual adaption reduces the gap from the fading channel capacity to 2 Db when assuming different services occur in equal probability and the service duration follows exponential distribution.
