Rank-2-optimal adaptive design of binary spreading codesRank-2-optimal adaptive design of binary spreading codes Peer-Reviewed Journal Publication Δημοσίευση σε Περιοδικό με Κριτές 2015-10-232007enOver the real/complex field, the spreading code that maximizes the signal-to-interference-plus-noise ratio (SINR) at the output of the maximum-SINR linear filter is the minimum-eigenvalue eigenvector of the interference autocovariance matrix. In the context of binary spreading codes, the maximization problem is NP-hard with complexity exponential in the code length. A new method for the optimization of binary spreading codes under a rank-2 approximation of the inverse interference autocovariance matrix is presented where the rank-2-optimal binary code is obtained in lower than quadratic complexity. Significant SINR performance improvement is demonstrated over the common binary hard-limited eigenvector design which is shown to be equivalent to the rank-1-optimal solution.Δημοσίευση σε επιστημονικό περιοδικό http://creativecommons.org/licenses/by/4.0/IEEE Transactions on Information Theory9533075 - 3080 Karystinos Georgios Καρυστινος Γεωργιος Pados, D.A. Institute of Electrical and Electronics Engineers Binary sequences code-division multiple-access (CDMA) code-division multiplexing signal waveform design signal-to-interference-plus-noise ratio (SINR) signature sets spread-spectrum communications