Patent ID: 6963600
Filing Date: 2005-11-08
Classification: H04J

Abstract:
1. A binary coded direct sequence spread spectrum communication system comprising a means for generating a binary spreading sequence set of length L and size M used in the system having a zero correlation zone Z CZ in their periodic autocorrelation functions on both sides of the zero shift and a zero correlation zone Z CZ in the periodic cross-correlation functions including the zero shift between any pair of spreading sequences belonging to the code sequence set wherein said binary spreading sequence set has length L=2×2 i ×10 j ×26 k , where i, j, k can be zeroes or any positive integers, and family size 2<M<L, and zero correlation zone Z CZ ≦L/M+1 for any permitted values of i, j, k, or Z CZ =L/M+1 for j=k=0 and any permitted value of i and comprises ZCZ sequence(s) and further comprises a means for generating a central frame by multiplying a binary input and said ZCZ sequence(s), and additional guard sequences enclosing the central frame, said additional guard sequence being extracted from parts of the central frame.