modulation demodulation的用法和样例：
例句
- In recent years, new modulation techniques supported by other technological advances have helped BPL evolve.
近年来，新调制解调技术的进步帮助了电力线宽带网络的发展。 - The main purpose is to study further in the constant envelope and Quasi-constant envelope modulations with high modulation efficiency.
主要研究适合深空信道传输的具有恒定或准恒定包络的高效数字调制方式与直接序列扩频相结合的组合调制解调方式。
