用于移动多媒体通信的双重自适应Turbo编码调制技术

给出了一种应用于移动多媒体通信的跨层的双重自适应编码调制技术.该技术采用Turbo码,并同时自适应于时变的信道特征和不同媒体业务的服务质量(QoS),以充分提高系统的平均吞吐量.首先给出经优化设计的实用信道自适应Turbo编码调制方案,该方案距Shannon极限仅2.5 dB;然后将一个QoS自适应方案加载其上,构成跨层的双重自适应结构.仿真结果表明,在假设所有媒体业务以等概率出现、业务持续时间服从指数分布时,该新颖的双重自适应技术可达到距衰落信道容量2 dB的优异性能.

Dual Adaptive Turbo Coded Modulation for Mobile Multimedia Communication

This paper proposed a cross-layer dual adaptive coded modulation architecture using Turbo codes for mobile multimedia communication, which simultaneously adapted to both the varying channel characteristics and the QoS of various mobile multimedia services to increase the average system throughput substantially. A pragmatic channel-adaptive Turbo coded modulation scheme, which comes within 2.5 dB of the Shannon limit, was optimally designed, and then a QoS-adaptive scheme was superimposed to build the dual adaptive architecture. The 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.