A new kind of access code with zero correlation window - DBL access code

Daoben Lab (DBL) access codes are generated from the Kronecker Product of the basic loose synchronization (LS) codes and a matrix. The feature is that codes are divided into several groups and the zero correlation window (ZCW) between the two different code groups is enlarged compared with the basic LS code, and the aperiodic auto-correlation and cross-correlation functions of the codes within one group are only determined by the corresponding matrix. Codes in the same group can be allocated to one user and the codes of different groups can be allocated to different users. Therefore, not only the number of available codes given the same code length is increased, but also ZCW is enlarged . Computer-based simulation also verified the feature of DBL access codes.