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.