频率漂移下DPSK信号的一种新Data-aided检测器

A New Data-aided Detector for Frequency-shifted DPSK Signals

将最近 Choi提出的一种频率漂移补偿算法纳入 Data- aided非相干检测的结构中 ,从而提出一种适用于频率漂移环境下的 Data- aided非相干检测。研究表明新算法性能要好于无频偏下 DPSK的理想差分检测 ,因而也一定优于 Choi文中所提及的算法。模拟研究甚至表明新算法性能逼近相干差分检测 。

By incorporating the frequency-offset compensation algorithm recently proposed by Choi into the structure of data-aided noncoherent detection, we proposed a new data-aided noncoherent detector for frequency-shifted DPSK signals. It is demonstrated that the new algorithm presents better performance than differential detection with perfect knowledge about frequency offset and thus is surely superior to all the algorithms mentioned in Chois paper. Simulation results show that the performance of the new algorithm even apporaches coherent detection with differential decoding. The new algorithm works well for a wide range of frequency offset.