New signature code sequence design techniques for CDMA systems

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.