為了在CDMA系統中更好地應用QDPSK數字調制方式，在分析四相相對移相（QDPSK)信號調制解調原理的基礎上，設計了一種QDPSK調制解調電路，它包括串并轉換、差分編碼、四相載波產生和選相、相干解調、差分譯碼和并串轉換電路。在MAX+PLUSⅡ軟件平臺上，進行了編譯和波形仿真。綜合后下載到復雜可編程邏輯器件EPM7128SLC84-15中，測試結果表明，調制電路能正確選相，解調電路輸出數據與QDPSK調制輸入數據完全一致，達到了預期的設計要求。 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.
上傳時間： 2013-10-28
上傳用戶：jyycc
3 phase motor driver source code with freescale MCU
標簽： freescale driver source phase
上傳時間： 2015-03-05
上傳用戶：wangyi39
phase unwrapping algorithm for SAR interferometry
標簽： interferometry unwrapping algorithm phase
上傳時間： 2015-04-06
上傳用戶：tzl1975
Carrier & Symbol Timing Recovery
標簽： Recovery Carrier Symbol Timing
上傳時間： 2014-01-12
上傳用戶：蠢蠢66
Control of High Voltage 3-Phase BLDC Motor
標簽： Control Voltage Phase Motor
上傳時間： 2015-04-21
上傳用戶：silenthink
three-phase Permanent Magnet Synchronous Motor(PMSM) velocity control DSP program
標簽： three-phase Synchronous Permanent velocity
上傳時間： 2014-06-10
上傳用戶：kelimu
Cycle slip probability of the phase unrapping algorithm
標簽： probability algorithm unrapping Cycle
上傳時間： 2013-12-09
上傳用戶：wpt
Blind Equalizer 的演算法主要是利用CMA及 LMS 的配合，當CMA將EYE打開，使訊號趨近于正確值，就切換到LMS，利用Slicer的輸出當作training sequence來調整Equalizer的系數，而Carrier Recovery 的部份，則是將phase error track出來
上傳時間： 2013-12-28
上傳用戶：it男一枚
phase lock loop for coherent detection
標簽： detection coherent phase lock
上傳時間： 2014-01-19
上傳用戶：rocketrevenge
Digital cellular telecommunications system (Phase 2+) AT command set for GSM Mobile Equipment (ME) (GSM 07.07 version 7.4.0 Release 1998)
標簽： telecommunications Equipment cellular Digital
上傳時間： 2014-12-05
上傳用戶：xzt
