中文摘要：

针对OFDM-IDMA系统中载波频偏（CFO）带来的子载波之间的干扰问题,提出了在各用户具有相同频偏下的联合逐码片（CBC）迭代检测的载波同步方法。该方法利用迭代检测中的外信息重构的信号作为虚拟的训练序列进行频域频偏估计,同时进行相应的时域频偏补偿。理论分析及实验仿真结果表明：基于逐码片迭代检测的OFDM-IDMA系统的频偏估计和补偿方法能够使系统性能接近无频偏时的性能。

英文摘要：

To solve the inter-carrier interference（ICI） of OFDM-IDMA systems due to the carrier frequency offset（CFO）,a carrier synchronization method based on chip-by-chip（CBC） iterative detection is proposed. This method employs the reconstructed signal of exterior information as virtual training sequence to estimate the residual frequency offset in frequency domain,and compensates corresponding loss of performance in time domain.Theoretical analysis and simulation results show that the performance of OFDM-IDMA systems with CFO employing carrier synchronization method based on CBC iterative detection is close to that of OFDM-IDMA systems without CFO.