Abstract:

To design DBL code for non orthogonal multi-carrier direct spread(DS) systems, the LS/DBL code correlation is deduced under certain condition, and the relation between frequency gap and number of codes is discussed. Meanwhile, some rules are given for DBL expanding matrix selection to reserve the zero correlation window(ZCW) property. Simulation shows that the DBL code constructed by this way will suffer no performance loss under Non Orthogonal Multi-carrier systems while the decoding complexity grows linearly with the number of subcarriers.

Key words: DBL code, zero correlation window, non-orthogonal multi-carrier;