移动通信的变速率调制的研究

Research on variable rate modulation in mobile communication

为了解决自适应调制在高速数据传输时带宽增加导致的频率资源紧张所带来的一系列问题,研究了变速率正交幅度调制(VR-QAM调制)和其中的VR-MQAM调制及其关键技术,即评估信道特性的参数选取、评估参数与调制电平数之间关系式的建立、评估信道特性的算法等.评估表明,优化的VR-QAM调制方案可以保证在一定的传输质量下充分地利用其高频带.

Self-adaptive modulations is the way to solve the problems of frequency of resource constraints when data transmitted with high speed making bandwidth increasing. A type of VR-QAM,VR-MQAM modulation with its key techniques are mainly analyzed, such as choosing of parameter assessing channel property, establishing of relationship between assessing parameter and modulation level, algorithm in assessing channel property and so forth. Evaluation results show that the optimization of VR-QAM modulation scheme can guarantee the full advantage of its high frequency band under certain transmission quality.