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Application of density evolution in turbo-MUD design for overloaded coded CDMA systems

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4 Author(s)
Morosi, S. ; Dipt. di Fisica, Firenze Univ., Italy ; Del Re, E. ; Fantacci, R. ; Chiassai, A.

An original turbo multiuser detector for overloaded coded DS-CDMA systems is presented and studied: the performance of the proposed system is tested by Monte Carlo simulations and by means of the density evolution theory. The proposed turbo-MUD receiver is based on the use a combination of a linear MMSE detector in the first stages and an interference cancellation scheme in the successive ones. The inputs of both receivers are the soft information from a bank of turbo decoders. The performance of the proposed receiver can be effectively predicted in overloaded communication systems by means of density evolution technique: the use of this technique also permits us to evaluate the proper number of MMSE iterations, making easier the design of the receiver.

Published in:

Spread Spectrum Techniques and Applications, 2004 IEEE Eighth International Symposium on

Date of Conference:

30 Aug.-2 Sept. 2004