Lagrange/Vandermonde MUI eliminating user codes forquasi-synchronous CDMA in unknown multipath
Scaglione, A.; Giannakis, G.B.; Barbarossa, S.
Signal Processing, IEEE Transactions on
Volume 48, Issue 7, Jul 2000 Page(s):2057 - 2073
Digital Object Identifier 10.1109/78.847790
Summary:A family of codes for low-complexity quasi-synchronous code
division multiple access (CDMA) systems is developed in order to
eliminate multiuser interference (MUI) completely in the presence of
unknown and even rapidly varying multipath. Judiciously designed
precomputable symbol-periodic user codes, which we term Lagrange or
Vandermonde, and the corresponding linear receivers offer a
generalization of orthogonal frequency division multiplexing (OFDM),
which are especially valuable when deep-fading, carrier frequency
errors, and Doppler effects are present. The flexibility inherent to the
designed transceivers is exploited to derive transmission strategies
that cope with major impairments of wireless CDMA channels. The
symbol-periodic code design is also generalized to include the class of
aperiodic spreading and orthogonal multirate codes for variable bit rate
users. Performance analysis and simulations results illustrate the
advantages of the proposed scheme over competing alternatives
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