Turbo multiuser detection for turbo-codes CDMA
| Autor: | Al Housseini, Ali, Chonavel, Thierry, Saoudi, Samir |
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| Přispěvatelé: | Département Signal et Communications (SC), Université européenne de Bretagne - European University of Brittany (UEB)-Télécom Bretagne-Institut Mines-Télécom [Paris] (IMT), Télécom Bretagne (devenu IMT Atlantique), Ex-Bibliothèque, Institut Mines-Télécom [Paris] (IMT)-Télécom Bretagne-Université européenne de Bretagne - European University of Brittany (UEB) |
| Jazyk: | francouzština |
| Rok vydání: | 2004 |
| Předmět: | |
| Zdroj: | Actes IEEE, ISIVC04, International Symposium on Image/Video Communications over fixed and mobile Networks, 7-9 July, Brest-France IEEE, ISIVC04, International Symposium on Image/Video Communications over fixed and mobile Networks, 7-9 July, Brest-France IEEE, ISIVC04, International Symposium on Image/Video Communications over fixed and mobile Networks, 7-9 July, Brest-France, Jul 2004, Brest, France. pp.181-184 |
| Popis: | International audience; Multiuser detection and turbo coding are two of the most powerful techniques for enhancing the performance of next-generation wide-band code-division multiple-access (CDMA) systems. We develop an iterative multiuser receiver for turbo-coded CDMA systems with aperiodic spreading sequences operating in multipath fading, which exploits the power of both techniques. The key innovation in the proposed receiver is a low-complexity soft multiuser detector which uses the same decision statistic as the conventional RAKE receiver (i.e., the outputs of the maximum ratio combiners for all the users), and performs soft-interference cancellation and instantaneous minimum mean-square error (MMSE) filtering. The soft multiuser detector has a complexity of O(K/sup 2/) per bit per iteration, where K is the number of users. A single-user receiver which employs a soft RAKE detector followed by a turbo decoder is also considered. Simulation results demonstrate that the proposed multiuser receiver offers more than 0.5-dB gain over the single-user RAKE receiver at a bit-error rate (BER) of 10/sup -3/ and even outperforms the single-user RAKE receiver operating in a single-user environment. |
| Databáze: | OpenAIRE |
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