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介绍自适应调制技术的原理、帧格式的设计,给出调制方式的选取与转换准则;通过数值积分和仿真的方法分析了自适应调制系统在平坦瑞利衰落信道下的性能,并与固定调制方式系统进行了比较。仿真结果表明,自适应调制系统能够获得较高的系统容量,而系统的误比特率也可以保持在较低的水平。
The principle of adaptive modulation technique and the design of frame format are introduced. The selection criteria of the modulation method are given. The performance of the adaptive modulation system under the flat Rayleigh fading channel is analyzed by means of numerical integration and simulation. The way the system was compared. The simulation results show that the adaptive modulation system can obtain higher system capacity, and the system bit error rate can be kept at a lower level.