Design of Turbo-MUD Receivers for Overloaded CDMA Systems by Density Evolution Technique

This paper deals with a turbo multiuser detector suitable for applications in overloaded coded DS-CDMA systems. The turbo-MUD receiver is based on the use of a linear MMSE detector in the first iteration and a parallel interference cancellation scheme in the successive ones. The inputs of the interference cancellator are both the detector outputs and the soft information from a bank of turbo decoders. The performance of the proposed receiver has been derived by means of computer simulations and applications of the density evolution theory: in particular, this technique permits to properly evaluate the number of MMSE iterations, simplifying the overall receiver design.

[1]  Sunghwan Kim,et al.  Performance of iterative multiuser detection with a partial PIC detector and serially concatenated codes , 2001, IEEE 54th Vehicular Technology Conference. VTC Fall 2001. Proceedings (Cat. No.01CH37211).

[2]  A. Glavieux,et al.  Near Shannon limit error-correcting coding and decoding: Turbo-codes. 1 , 1993, Proceedings of ICC '93 - IEEE International Conference on Communications.

[3]  H. Vincent Poor,et al.  Iterative (turbo) soft interference cancellation and decoding for coded CDMA , 1999, IEEE Trans. Commun..

[4]  Paul D. Alexander,et al.  Iterative detection in code-division multiple-access with error control coding , 1998, Eur. Trans. Telecommun..

[5]  J. Boutros,et al.  Iterative multiuser joint decoding: unified framework and asymptotic analysis , 2001, Proceedings. 2001 IEEE International Symposium on Information Theory (IEEE Cat. No.01CH37252).

[6]  Z. Qin,et al.  Iterative multiuser detection with Gauss-Seidel soft detector as first stage for asynchronous coded CDMA , 2000 .

[7]  Patrick Robertson,et al.  A comparison of optimal and sub-optimal MAP decoding algorithms operating in the log domain , 1995, Proceedings IEEE International Conference on Communications ICC '95.

[8]  Sergio Benedetto,et al.  A linear front end for iterative soft interference cancellation and decoding in coded CDMA , 2005, IEEE Transactions on Wireless Communications.

[9]  William E. Ryan,et al.  Near-optimal convolutionally coded synchronous CDMA with iterative multiuser detection/decoding , 2001, GLOBECOM'01. IEEE Global Telecommunications Conference (Cat. No.01CH37270).

[10]  Rüdiger L. Urbanke,et al.  Design of capacity-approaching irregular low-density parity-check codes , 2001, IEEE Trans. Inf. Theory.

[11]  Mari Kobayashi.  Iterative soft-SIC joint decoding and parameter estimation , 2001 .

[12]  Chin-Liang Wang,et al.  An iterative multiuser receiver using partial parallel interference cancellation for turbo-coded DS-CDMA systems , 2001, GLOBECOM'01. IEEE Global Telecommunications Conference (Cat. No.01CH37270).

[13]  Shlomo Shamai,et al.  Spectral Efficiency of CDMA with Random Spreading , 1999, IEEE Trans. Inf. Theory.

[14]  Dariush Divsalar,et al.  Iterative turbo decoder analysis based on density evolution , 2001, IEEE J. Sel. Areas Commun..

[15]  Stephen G. Wilson,et al.  Multiuser ML sequence estimator for convolutionally coded asynchronous DS-CDMA systems , 1996, IEEE Trans. Commun..

[16]  Jah-Ming Hsu,et al.  A low-complexity iterative multiuser receiver for turbo-coded DS-CDMA systems , 2001, IEEE J. Sel. Areas Commun..

[17]  Giuseppe Caire,et al.  Iterative multiuser joint decoding: Unified framework and asymptotic analysis , 2002, IEEE Trans. Inf. Theory.