This thesis studied the modulation and demodulation technology of CDMA by comparing several technologies.
本文主要研究了CDMA技术中调制解调方法的选取与比较。
Pulse Position Modulation (PPM) is one of key technologies for laser communication in Atmosphere, which can reduces the output power of the laser and increases communication distance.
脉冲位置调制(PPM)是大气激光通信的关键技术之一，可以减少激光器的发射功率，增加通信距离。
To develop highly efficient coding, modulation and signal processing technologies is becoming the most necessary measure to realize these demands.
开发高效的编码、调制以及信号处理技术成为提高无线频率效率的必然手段和当务之急。
Experiment result shows that these technologies have better performances for automatic modulation recognition of communication signals.
实验结果表明，该技术拥有较好的通信信号调制体制识别性能。
The design made some progress in data-encoding of the physical layer, the type of modulation and some other key technologies, and the performance of it was improved greatly.
该设计在物理层数据编码、调制方式等一些关键技术方面进行了改进，性能上有很大的提高。
The design made some progress in data-encoding of the physical layer, the type of modulation and some other key technologies, and the performance of it was improved greatly.
该设计在物理层数据编码、调制方式等一些关键技术方面进行了改进，性能上有很大的提高。
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