Synchronization of WCDMA TDD Node B using Better Security Sequences

In order to prevent inter-slot interference and enhance the system capacity in Wideband Code Division Multiple Access (WCDMA) Time Division Duplex (TDD) mode of communication, synchronization between Node Bs (NBs) are necessary. Although the most straightforward way of achieving synchronization is by using the Global Positioning System (GPS), 3GPP hopes to achieve a completely independent and self-reliant communication system. Therefore 3GPP proposed using concatenated sequences for synchronizing Time Division Duplex (TDD) Node Bs in order to compensate the timing difference among Node Bs. 3GPP suggested using the Concatenated Extended Complementary (CEC) sequences and CEC sequences with multiple code offsets for this synchronization purpose. In this paper, we propose using cyclically extended sequences using integer numbers (mod 4) for NB synchronization. The proposed sequences have comparable autocorrelation and cross correlation properties than the CEC sequences. The purpose of using better security sequences is to prevent intentional sabotage.