CAJ | 학술논문

在长期演进（LTE）的小区搜索中，定时同步与频偏估计是一个非常重要的同步过程。基于分段相关算法，提出了一种改进算法。利用分段相关算法具有抗频偏的优点结合差分运算，并采用对接收端信号进行累积处理方法，提高了定时同步精度。将本地PSS信号累积相加的结果与接收信号进行相关运算，有效降低了算法的运算量。同时利用本地PSS信号与接收PSS信号的相关性，提出一种有效的频偏估计算法。理论分析与仿真实验表明，与传统算法相比，提出的定时与频偏估计算法有效提高了估计精度，减小了运算量。
재장기연진（LTE）적소구수색중，정시동보여빈편고계시일개비상중요적동보과정。기우분단상관산법，제출료일충개진산법。이용분단상관산법구유항빈편적우점결합차분운산，병채용대접수단신호진행루적처리방법，제고료정시동보정도。장본지PSS신호루적상가적결과여접수신호진행상관운산，유효강저료산법적운산량。동시이용본지PSS신호여접수PSS신호적상관성，제출일충유효적빈편고계산법。이론분석여방진실험표명，여전통산법상비，제출적정시여빈편고계산법유효제고료고계정도，감소료운산량。
In the cell search scheme of Long Term Evolution(LTE), time and frequency offset estimation is the crucial process in the synchronization procedure. Based on partial correlation algorithm which can combat the frequency offset, it proposes a new symbol timing synchronization algorithm which combines with differential correlation and the method for accumulation of the received signals. The correlation between the sum of three groups of local PSS signals and the received signals is employed which can reduce computational load. An efficient frequency offset estimation algorithm is proposed by using the correlation between local PSS signals and the received signals. Both theory analysis and simulation results show that the proposed algorithm improves the accuracy and reduces the computational load compared to the conventional algorithm.