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New design techniques are presented for carefully selecting subsets of signature code sequences with small cross-correlation magnitudes for applications in code inversion keying (CIK) direct-sequence spread-spectrum multiple-access systems. Also, a new class of code sequences, which has been called the class of 'structured code' sequences, with small crosscorrelation magnitudes is presented. The performance measure considered is the average probability of data-bit error at the output of a correlator receiver. The results presented are applicable to various applications of code-division multiple-access (CDMA) systems including optical fibre local area networks and indoor radio communications.
Date of Publication: 14 Feb. 1991