Gold codes, Hadamard partitions and the security of CDMA systems
Designs, Codes and Cryptography
The Application of Frequency Assignment Techniques in Spreading Code Assignment
Wireless Personal Communications: An International Journal
Walsh-Like Nonlinear Phase Orthogonal Codes for Direct Sequence CDMA Communications
IEEE Transactions on Signal Processing - Part II
Quasi-orthogonal sequences for code-division multiple-access systems
IEEE Transactions on Information Theory
Spreading codes for direct sequence CDMA and wideband CDMA cellular networks
IEEE Communications Magazine
Design of spreading codes for quasi-synchronous CDMA with intercell interference
IEEE Journal on Selected Areas in Communications
The Assignment of CDMA Spreading Codes Constructed from Hadamard Matrices and Almost Bent Functions
Wireless Personal Communications: An International Journal
Hi-index | 754.84 |
Spreading codes for code-division multiple-access (CDMA) systems are constructed based on Hadamard matrices and almost-bent functions. These codes can be assigned to a tessellation of hexagonal cells in such a way that codewords assigned to the same cell or to adjacent cells have zero cross-correlation. The nonzero cross-correlations in the code only apply to pairs of codewords assigned to nonadjacent cells. The codes have four times as many codewords as codes constructed from a single Hadamard matrix, which leads to significantly increased codeword re-use distances in comparison with the conventional use of a single Hadamard matrix with the same number of codewords per cell.