A low complexity scheme for S-SCH detection in 3GPP LTE downlink system

Synchronization and cell search are of fundamental importance for the 3^rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) downlink system. In LTE, the secondary synchronization channel (S-SCH) contains the information of 10 ms frame timing and cell identity group. Hence, it is important for user equipment (UE) to detect S-SCH effectively. In this paper, we present a low computational complexity and reliable scheme for S-SCH detection. In contrast to the optimal maximum likelihood sequence detection (MLSD) scheme, in the proposed scheme, the cross correlation method for getting the candidate sequences and the MLSD algorithm for the final decision are performed in the even and odd positions of the received S-SCH sequences respectively, where it has a significantly low computational complexity. Simulation results demonstrate that our proposed scheme has a high detection correct probability, and performs well at poor channel estimation.