基于第三代移动通信系统的自适应多速率链路适配方案

针对第三代移动通信系统的特点,提出了一种新的自适应多速率链路适配方案.该方案综合考虑了自适应多速率编码器和功率控制对业务质量的影响.综合比较接收端的信号干扰比与切换门限值和发射功率与发射信号门限值,无线资源管理器能够根据跟踪具体链路的信道变化情况,选择合适的编码模式,提供可靠的业务质量并提高系统容量.基于WCDMA系统FDD模式上行链路仿真平台,构造了AMR链路适配平台并进行了实现方案及算法性能的仿真.仿真结果表明,该方案能够跟踪信道快速变化,实现编码模式的平滑切换,AMR合成语音质量优于单一编码模式,为AMR编码技术提供了适用于第三代移动通信系统的链路适配方案.

Investigation of Adaptive Multi-Rate Link Adaptation of 3G System

In term of the features of 3G system, a novel AMR link adaptation strategy for 3G system is proposed. The impacts of AMR codec modes and power control on traffic quality of service are taken into account in the strategy at the same time. By synthetically comparing the signal-to-interference ratio value with the switching threshold and comparing the transmission power with its threshold, radio resource management can always keep each link on its proper codec mode with the corresponding optimal power level to achieve both robust speech quality and link capacity enhancement. Based on the WCDMA FDD uplink link-level simulation platform, AMR link adaptation platform is constructed. Simulation results show that the algorithm can track the fast change of channel conditions and select the most robust codec mode, thus the synthetic speech quality of AMR is better than that of signal mode during a wide range of channel conditions. The result will provide a reference strategy for AMR link adaptation of 3G system.