Welch ' s Bound and Sequence Sets for Code-Division Multiple-Access Systems

  title={Welch ' s Bound and Sequence Sets for Code-Division Multiple-Access Systems},
  author={James L. Massey and Thomas Mittelholzer},
Welch's bound for a set of M complex equi-energy sequences is considered as a lower bound on the sum of the squares of the magnitudes of the inner products between all pairs of these sequences. It is shown that, when the sequences are binary (±-1 valued) sequences assigned to the M users in a synchronous code-division multiple-access (S-CDMA) system, precisely such a sum determines the sum of the variances of the interuser interference seen by the individual users. It is further shown that… CONTINUE READING
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