一种用于TD-LTE系统CP类型估计的改进算法

TD-LTE(时分-长期演进)系统中CP(循环前缀)有防止符号间干扰等作用,接收端只有确定CP类型才能确定准确的FFT(快速傅里叶变换)解调窗口位置。提出了基于CP的相关算法和能量差值算法,CP为该符号尾端一段数据的复制,通过不同CP长度间相关系数比值和能量差值系数比值来估计CP类型;考虑到算法复杂度和DSP(数字信号处理)实现简易程度,进一步改进了该算法,提出了基于部分CP序列的集能量差值算法,仿真结果和算法原理表明了该算法具有实用性强和复杂度低等优点。

An improved algorithm for CP type estimation in TD-LTE systems

Cyclic Prefix (CP) plays a role in preventing inter-symbol interferences in TD-LTE systems and only when the relevant CP type is determined at the receiver end, can the accurate FFT decoding window be fixed. This paper presents the CP-based relevant algorithm and energy difference algorithm and, using CP as the replication feature of the symbol end data, estimates the CP type on the basis of the correlation coefficient ratio and the energy difference ratio between different CP lengths. Considering the algorithm complexity and the simplicity and easiness of DSP realization, it further improves this algorithm and proposes a partial CP sequence-based set-related energy difference algorithm. Simulation results and the algorithm principle demonstrate its applicability and low complexity.