CAJ | 학술논문

该文提出了一种用于重叠码调制-正交频分复用(SCM-OFDM)系统中基于信号检测的频偏估计方法.这种估计方法首先利用SCM迭代检测器输出的判决符号重构接收信号,再利用最小均方误差准则对频偏进行估计.该方法不需要额外的训练序列或导频符号,是一种高效的盲频偏估计方法.此外,该文还提出了一种改进的频偏估计方法.在改进的方法中,接收机将频偏估计与信号检测进行联合迭代;这样在每一次迭代过程中,信号检测和频偏估计都需要执行一次,并且接收机在信号检测时可以利用上一次得到的频偏估计值进行频偏补偿.仿真结果表明,该文提出的基于信号检测的频偏估计方法能够高效并准确地估计出SCM-OFDM系统的频偏.
해문제출료일충용우중첩마조제-정교빈분복용(SCM-OFDM)계통중기우신호검측적빈편고계방법.저충고계방법수선이용SCM질대검측기수출적판결부호중구접수신호,재이용최소균방오차준칙대빈편진행고계.해방법불수요액외적훈련서렬혹도빈부호,시일충고효적맹빈편고계방법.차외,해문환제출료일충개진적빈편고계방법.재개진적방법중,접수궤장빈편고계여신호검측진행연합질대;저양재매일차질대과정중,신호검측화빈편고계도수요집행일차,병차접수궤재신호검측시가이이용상일차득도적빈편고계치진행빈편보상.방진결과표명,해문제출적기우신호검측적빈편고계방법능구고효병준학지고계출SCM-OFDM계통적빈편.
A Carrier Frequency Offset (CFO) estimation method is proposed based on signal detection in Superposition Coded Modulation (SCM)-OFDM systems. This method reconstructs first the received signal by decision symbols from the SCM iterative detector, and then estimates the CFO by employing the Minimum Mean Squared Error (MMSE) criterion. It is an efficient blind CFO estimation method without the aid of extra training sequences or pilot symbols. Furthermore, an improved method is proposed to estimate CFO in this paper. In the improved method, a joint CFO estimation and signal detection receiver is realized by an iterative process. Thus data detection and CFO estimation need to be implemented in each iteration process. And the receiver can compensate the CFO by the last estimated value during signal detection. Simulation results show that the proposed CFO estimation methods can significantly and accurately estimate the CFO for SCM-OFDM systems.