公开(公告)号：US07133479B2

公开(公告)日：2006-11-07

申请号：US10413526

申请日：2003-04-15

申请人： Tsung-Lin Lee

发明人： Tsung-Lin Lee

IPC分类号： H04L7/00 ,  H04J3/06 ,  H04J11/00

CPC分类号： H04L27/2676 ,  H04L27/2659 ,  H04L27/266 ,  H04L27/2675

摘要： A frequency synchronization apparatus and method for OFDM systems. The frequency synchronization apparatus is comprised of a digital mixer, a first synchronizer and a second synchronizer. The digital mixer acquires a baseband signal by means of a local frequency and adjusts the local frequency in response to an integer frequency offset and a fractional frequency offset. The first synchronizer takes a sequence of received samples derived from the baseband signal in a time domain to estimate the fractional frequency offset. The fractional frequency offset is fed back to the digital mixer. After that, the second synchronizer takes a sequence of demodulated symbols derived from the baseband signal in a frequency domain. The second synchronizer yields the integer frequency offset through a coarse search stage and a fine search stage. Then, the integer frequency offset is fed back to the digital mixer.

摘要翻译： 一种用于OFDM系统的频率同步装置和方法。 频率同步装置包括数字混频器，第一同步器和第二同步器。 数字混合器通过本地频率获取基带信号，并响应于整数频率偏移和小数频率偏移来调整本地频率。 第一同步器在时域中获取从基带信号导出的接收样本的序列，以估计分数频率偏移。 分数频率偏移反馈到数字混频器。 之后，第二同步器在频域中获取从基带信号导出的解调符号序列。 第二同步器通过粗搜索阶段和精细搜索阶段产生整数频率偏移。 然后，将整数频率偏移反馈到数字混频器。