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Universal code designs for widely-linear multiuser detection in downlink MC-CDMA

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3 Author(s)
Cacciapuoti, A.S. ; Univ. degli Studi di Napoli Federico II, Naples ; Gelli, G. ; Verde, F.

This paper deals with multiuser detection for multicarrier code-division multiple-access (MC-CDMA) systems, employing either zero-padded or cyclic-prefixed transmission techniques. For both systems, we consider widely-linear finite-impulse response (WL-FIR) estimators, which process both the received signal and its complex conjugate version. With regard to downlink configurations, it is shown that, if the number of users does not exceed a given threshold and their codes are appropriately designed, channel-irrespective WL-FIR zero-forcing symbol recovery is possible. In particular, some spreading code examples are provided, which satisfy our design rules.

Published in:

Signal Processing Advances in Wireless Communications, 2007. SPAWC 2007. IEEE 8th Workshop on

Date of Conference:

17-20 June 2007