论文部分内容阅读
由于多普勒频移和载波频差引起的大频偏问题对数字移动通信系统的性能影响很大，文中在研究多普勒频移（ＤＦＳ）校正数字滤波算法的基础上，设计并实现了传输速率为４．８ｋｂｉｔ／ｓ的四相差分相移键控调制（ＤＱＰＳＫ）的全数字接收机，并且对存在多普勒频漂和载波频差时的性能进行了分析和测试。研究结果表明，该接收机在结构上更为简单、实现更为有效，该接收机抗频偏能力接近传输符号速率，并具有较强的抗ＤＦＳ频漂能力。
Due to the large frequency offset caused by Doppler shift and carrier frequency offset, the performance of digital mobile communication systems is greatly affected. Based on the research of DFS-corrected digital filtering algorithms, the design and implementation of All-digital receiver with four-phase differential phase shift keying (DQPSK) with a transmission rate of 4.8kbit / s is analyzed and tested for performance in the presence of Doppler shift and carrier frequency offset. The results show that the receiver is simpler in structure and more effective. The receiver has anti-skew capability close to the transmission symbol rate and strong anti-DFS frequency drift capability.