微波QPSK调制器的性能分析

THE PALAEOCLIMATIC RECORDS BETWEEN THE INNER MONGOLIA SALT LAKE’ AND TAIWAN LAKES’SEDMENTS

数字微波直接调制技术有利于减小移动通信设备的体积，降低成本，是目前数字微波通信的一个重要发展趋势。本文讨论广泛应用的微波ＱＰＳＫ调制器的关键指标，如邻近频道功率、误差矢量幅度等。并介绍调制器电路设计技术的进展和趋势。

According to the relative information from the circumstance and climatic condition,which have been given by salt lakes’ sediments in Inner Mongolia of the arid and semiarid area,detail climatic changes could have been explained since recent 23kaB.P. Climate offered as a temperate dry character during 20ka-23kaB.P. After then the climate chenged cold and it was maximum cold period of the last glacial scale and the summer monsoon retreated, but the winter one became much stronger. Globe went into a glacial melting epoch since 14.5kaB.P. and an abnormal sudden variation lower temperature event Younger DrYas presented at some 11kaB.P. Since 2.3kaB.P. the summer monsoon retreated and reduced contineously,but there were some obvious climatic fluctuations. The sediments collected from Chetuichi and Chia min lakes in Taiwan have recorded the climatic fluctuations since recent thousands. Climatic cold and warm variations of above lakes correlated mostly with ones from salt lakes in Inner mongolia providing large scale climatic changes since 20-23kaB.P.