S.R. Park (Korea), I. Song (Canada), and J. Lee (Korea)
DS/CDMA, signature sequence, PR-QMF, correlation
In this paper, we propose three classes of multi-valued sig nature sequences for direct sequence code divisionmultiple access (DS/CDMA) systems. The first class derived from the two-band perfect reconstruction quadrature mirror fil ter (PR-QMF) bank has perfect correlation properties when the number of users is two in the DS/CDMA system. The first two classes have perfect correlation properties for syn chronous DS/CDMA systems. In addition, the third class in general has better correlation properties than other well known sequences also in asynchronous DS/CDMA sys tems.
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