Sequences for Inter-Base Synchronization in WCDMA TDD Mode

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 the base stations are necessary. Although the most straightforward way of achieving synchronization is by using the global positioning system (GPS), it is very costly. An alternative solution proposed by 3GPP uses Concatenated Extended Complementary (CEC) sequences with multiple code offsets to synchronize the base stations via air-interface since this would reduce the costs of base stations. However the sequence’s cross correlation property is undesirable. Thus new concatenated sequences with relatively better cross correlation properties than the proposed sequences are being explored. These sequences have a length with a power of 2 in order to improve its compatibility with digital electronics equipment.