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系统同步是MC-CDMA中的关键技术,本文提出一种基于用户扩频序列的同步算法,该算法充分利用用户扩频序列的特性在频域采用分段相关求和实现整数倍频偏估计,然后将经频偏补偿后的接收序列和本地参考序列进行时域相关运算实现精确定时同步。文中的算法不需要插入导频或训练序列,数据传输效率和功率利用率高,仿真结果验证了算法的有效性。
System synchronization is the key technology in MC-CDMA. In this paper, a synchronization algorithm based on user spreading sequence is proposed. This algorithm makes full use of the characteristics of user spreading sequences to achieve integer multiple frequency offset estimation in frequency domain by using subsection correlation summation. Then the receiving sequence after frequency offset compensation and the local reference sequence for time-related operations to achieve precise timing synchronization. The algorithm does not need to insert pilot or training sequence, the data transmission efficiency and power utilization rate are high, the simulation results verify the effectiveness of the algorithm.