A new class of dao ben lab code division multiple access (DBL-CDMA) spreading codes with zero correlation window (ZCW) was presented, which is constructed by making kronecker product of basic loose synchronous (LS) codes and special complex matrix which is constructed by Barker sequence and its phase rotation. The auto-correlation and cross-correlation function of these new codes were analyzed and some basic theorems and corollaries on these new codes were proved. In addition, the realization methods of these new codes were also discussed. Compared with the basic LS codes, the new DBL-CDMA access codes extend the minimum ZCW, increase the number of available access codes and the number of perfect complementary pair for a fixed code length. Moreover, only few side lobes of auto-correlation and cross-correlation function appear in few time shift axis in the same group. The computer simulation results verify the validity of the theoretical derivations.
Golay M J E. Complementary series[J]. IRE Trans, Inform. Theory, 1961, IT-7:82-87
Fan P Z, Suehiro, Kuroyanagi,et al. A class of binary sequences with zero correlation zone[J].Electronics Letters.1999, 35:777-779
Li D B. A spread spectrum multiple access coding method with zero correlation window . PCT/CN00/00028. 2000
�����.��������ش���ּ���:�й�, PCT/ CN2006/000947 .2006 Li Daoben, Grouped multiple access codes with zero correlation window:China, PCT/CN2006/000947 .2006(in Chinese)
���ܾ�,�����.�ྶ˥���ŵ��µ���Ƶ����������ϼ��[J].ͨ��ѧ��, 2004, 25(4): 15-22 Xu Shaojun,Li Daoben. Spreading code design and joint detection in multi-path fading channels[J]. Journal on Communicaitons, 2004, 25(4):15-22 (in Chinese)
����,�����,������. һ���µ�LS�뼰�乹�췽��[J].�����ʵ��ѧѧ��, 2006,29(3):103-106 Yang Xing, Li Daoben, Zou Yongzhong. A new kind of LS code and its construct method[J]. Journal of BeiJing University of Posts and Telecommunications, 2006,29(3):103-106 (in Chinese)
Tang X H, Fan P Z. Bounds on aperiodic and odd correlations of spreading sequences with low and zero correlation zone[J].Electronics Letters.2001, 37 (19):1201-1203