伪叠加Zadoff-Chu序列的符号同步算法

Pseudo-imposed Zadoff-Chu Sequence Symbol Synchronization Algorithm

提出了伪叠加Zadoff-Chu序列符号同步算法,由于在频域上等间隔插入Zadoff-Chu序列,经傅里叶逆变换到时域后的序列仍具有良好的自相关和互相关特性,该算法充分利用这一特性来进行符号同步,且不需要对长期演进(LTE,Long Term Evolution)帧结构进行任何修改和叠加任何正交频分复用技术(OFDM,Orthogonal Frequency Division Multiplex)符号序列。仿真结果表明,伪叠加Zadoff-Chu序列符号同步算法在各种信道环境下呈现良好的同步性能,明显优于基于循环前缀的算法。联合该算法与基于循环前缀的算法,能够进一步提高同步性能、减少算法复杂度。

Conventional symbol synchronization algorithms could not take full advantage of reference signals in LTE systems.Therefore,a pseudo-imposed sequence symbol synchronization algorithm is proposed,which could take advantage of good auto-correlation and cross-correlation characteristics of Zadoff-Chu sequences both in time domain and frequency domain.The proposed algorithm has no change in frame structure and could not really impose any sequence on OFDM symbol.Simulation results show that the proposed algorithm has very good synchronization performance in different channel environments.Combined with the CP based symbol synchronization algorithm,the proposed algorithm is further improved in complexity and synchronization performance.