为了在CDMA系统中更好地应用QDPSK数字调制方式，在分析四相相对移相（QDPSK)信号调制解调原理的基础上，设计了一种QDPSK调制解调电路，它包括串并转换、差分编码、四相载波产生和选相、相干解调、差分译码和并串转换电路。在MAX+PLUSⅡ软件平台上，进行了编译和波形仿真。综合后下载到复杂可编程逻辑器件EPM7128SLC84-15中，测试结果表明，调制电路能正确选相，解调电路输出数据与QDPSK调制输入数据完全一致，达到了预期的设计要求。 Abstract: In order to realize the better application of digital modulation mode QDPSK in the CDMA system， a sort of QDPSK modulation-demodulation circuit was designed based on the analysis of QDPSK signal modulation-demodulation principles. It included serial/parallel conversion circuit, differential encoding circuit, four-phase carrier wave produced and phase chosen circuit, coherent demodulation circuit, difference decoding circuit and parallel/serial conversion circuit. And it was compiled and simulated on the MAX+PLUSⅡ software platform,and downloaded into the CPLD of EPM7128SLC84-15.The test result shows that the modulation circuit can exactly choose the phase，and the output data of the demodulator circuit is the same as the input data of the QDPSK modulate. The circuit achieves the prospective requirement of the design.
上传时间： 2013-10-28
上传用户：jyycc
3 phase motor driver source code with freescale MCU
标签： freescale driver source phase
上传时间： 2015-03-05
上传用户：wangyi39
phase unwrapping algorithm for SAR interferometry
标签： interferometry unwrapping algorithm phase
上传时间： 2015-04-06
上传用户：tzl1975
Carrier & Symbol Timing Recovery
标签： Recovery Carrier Symbol Timing
上传时间： 2014-01-12
上传用户：蠢蠢66
Control of High Voltage 3-Phase BLDC Motor
标签： Control Voltage Phase Motor
上传时间： 2015-04-21
上传用户：silenthink
three-phase Permanent Magnet Synchronous Motor(PMSM) velocity control DSP program
标签： three-phase Synchronous Permanent velocity
上传时间： 2014-06-10
上传用户：kelimu
Cycle slip probability of the phase unrapping algorithm
标签： probability algorithm unrapping Cycle
上传时间： 2013-12-09
上传用户：wpt
Blind Equalizer 的演算法主要是利用CMA及 LMS 的配合，当CMA将EYE打开，使讯号趋近于正确值，就切换到LMS，利用Slicer的输出当作training sequence来调整Equalizer的系数，而Carrier Recovery 的部份，则是将phase error track出来
上传时间： 2013-12-28
上传用户：it男一枚
phase lock loop for coherent detection
标签： detection coherent phase lock
上传时间： 2014-01-19
上传用户：rocketrevenge
Digital cellular telecommunications system (Phase 2+) AT command set for GSM Mobile Equipment (ME) (GSM 07.07 version 7.4.0 Release 1998)
标签： telecommunications Equipment cellular Digital
上传时间： 2014-12-05
上传用户：xzt
