A new look at digital orthogonal transmultiplexers for CDMAcommunications

Authors:
A.N. Akansu;M.V. Tazebay;R.A. Haddad
Affiliations:
Dept. of Electr. & Comput. Eng., New Jersey Inst. of Technol., Newark, NJ;-;-
Venue:
IEEE Transactions on Signal Processing
Year:
1997

Citing 0
Cited 3

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Abstract

Orthogonal transmultiplexers have been successfully utilized for multiuser communications. They are of the FDMA type in their most common version. The transmultiplexers using frequency selective PR-QMFs as their user codes were reported in the literature. This approach conflicts with the requirements of a CDMA communications system. We introduce novel spread spectrum PR-QMF codes, wherein the orthogonality is distributed over both time and frequency domains. It is shown that the proposed multivalued spread spectrum PR-QMF codes with minimized auto and cross-correlation properties outperform the conventional binary Gold codes in CDMA communication scenarios considered in the article