Time-domain-cascade-correlation Timing Advance estimation method in LTE-A super coverage

Abstract

Aiming at the uplink out-of-synchronization resulted from the long distance between the UE (User Equipment) and eNodeB (evolved NodeB) in LTE-A (Long Term Evolution-Advanced) super coverage, a time-domain-cascade-correlation method for estimating TA (Timing Advance) is proposed in this paper. Based on the design of the random access preamble structure, the eNodeB achieves the estimation of TA by cascading two different ZC (Zadoff-Chu) sequences to form the preamble sequence and detecting the delay of channel with the sliding correlation in the time domain. The theoretical analysis and simulation results show that the coverage performance of the Physical Random Access Channel (PRACH) can meet the requirements in LTE-A super coverage with the proposed method.