In this paper, an adaptive modulation system controlled by changing the symbol rate and modulation level is proposed.
本文研究了通过改变符号率及调制电平的方法实现的自适应调制系统。
The power penalty of direct modulation is smaller than that of external modulation at the same crosstalk level.
在相同串扰水平情况下，直接调制的功率代价小于外调制的功率代价。
This scheme exhibits a good PAPR reduction performance, and for signals of high level modulation, such as 16qam and 64qam, it approaches the best performance of all SLM schemes.
结果表明该方案在抑制峰均比方面呈现出很好的性能，对于高阶调制信号，如16 QAM和64qam，它甚至达到选择性映射所能实现的最佳性能。
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