Abstract
Spreading codes for 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 non-zero cross-correlations in the code only apply to pairs of codewords assigned to non-adjacent 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.
Original language | English |
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Pages (from-to) | 5757 - 5761 |
Number of pages | 4 |
Journal | IEEE Transactions on Information Theory |
Volume | 56 |
Issue number | 11 |
DOIs | |
Publication status | E-pub ahead of print - 12 Nov 2010 |
Keywords
- code assignment
- code-division multiple-access systems
- Gold codes
- hadamard matrices
- CDMA