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为了增加扩频通信系统的码字数量并且降低系统的多址干扰和符号间干扰,将地址码设计与多用户检测结合,设计了DBL-CDMA(Daoben Labs code division multiple access)互补地址码。理论分析和仿真结果表明,DBL-CDMA地址码码字的自相关值以及该码字与几个可用码字间的互相关值仅在几个时间偏移处有附峰;该码字与其他可用码字的互相关值有大的零相关窗(zero correlation window,ZCW)。多用户检测只着重对相关有附峰的码字检测,降低了多用户检测的复杂度。相对于同样长度的LS(loosely synchronous)码,DBL-CDMA互补地址码大幅增加了可用的码字数量和每个码字的理想互补码的数目,扩展了码字间的ZCW。
In order to increase the number of codewords in spread spectrum communication system and reduce the multiple access interference and intersymbol interference of the system, the address code design and multi-user detection are combined to design the complementary address code (DBL-CDMA). The theoretical analysis and simulation results show that the autocorrelation value of the DBL-CDMA address codeword and the cross-correlation value between the codeword and several available codewords have appending peaks only at a few time offsets; The cross-correlation values of available codewords have a large zero correlation window (ZCW). Multi-user detection only focuses on the code word detection associated with peak, reducing the complexity of multi-user detection. Compared with LS (loosely synchronous) codes of the same length, the DBL-CDMA complementary address code greatly increases the number of available codewords and the number of ideal complementary codes per codeword, and extends the ZCW between codewords.