From aspects of estimation range

estimation accuracy and calculation complexity

five existing frequency offset estimation algorithms are studies and emulated

and the basis of their selection and detailed analytical results given.On this basis

the joint frequency offset estimation algorithm for TSO-based Midamble code and SYNC-DL code is studied by using the differential correlation method and the estimation range and calculation complexity analyzed.It is found from emulation that frequency offset can be controlled within ±0.05×10-6 by using this algorithm and accurate estimation in the signal acquisition system well achieved.