differential demodulation造句

• In the second part , the necessity of employing differential demodulation in rapid changing channel was explained , performance of multiple symbol detection of mdpsk and decision feed back multiple symbol detection were analyzed . then we present a new differential demodulation algorithm . the decision data is used to recover the carry phase . given the same observation intervals , this demodulation algorithm has almost the same performance , but the receiver is much more simplified
  第二章首先指出了信道参数变化剧烈的情况下，采用差分解调的必要性；分析了多码元差分解调和数据判决反馈解调算法的性能和抑制噪声的能力；在此基础上提出了一种新的差分解调方案：利用判决数据辅助进行载波恢复，即在判决数据的辅助下，采用fir ( finantimpounsrespouns )结构对载波相位进行预测的一种算法，精心设计了该算法的实现结构。
• This project study the all - digital modulation and demodulation of / 4 offset differentially encoded quadrature phase shift keying ( / 4 - dqpsk ) . then use / 4 - dqpsk digital modulation and baseband differential demodulation technology to implement digital signal transmission . the bite rate is 500kb / s and the intermediate frequency is 2mhz
  本课题对/ 4 - dqpsk的全数字调制解调技术进行研究,利用/ 4 - dqpsk数字调制和基带差分解调技术实现数字信号的传输,实现传输码率500kbps ,调制中频2mhz 。
• This dissertation adopts a universal digital ds / dmpsk modulation and demodulation scheme which is based on fpga . this scheme adopts quadrature balanceable modulation , intermediate frequency sampling , digital matched filtering , delay differential demodulation techniques and so on . it directly processes the digital signals on intermediate frequency without down - conversion , and doesn ’ t need pseudo random codes synchronization and carrier wave extraction circuits
  本文采用了一种基于fpga的通用数字调制解调方案,该方案在调制端采用了正交平衡调制技术,在解调端采用了中频带通采样、数字匹配滤波、延时差分解调等技术,直接在中频上进行数字信号处理,不需要进行下变频,也不需要增加额外的伪随机码同步捕获和载波提取电路。