CHAFNAJI Houda², AIT IDIR Tarik², SAOUDI Samir^1,4, VASILAKOS Athanasios³

Article de revue avec comité de lecture

EURASIP journal on wireless communications and networking, april 2012, vol. 134

2012

In this paper, we investigate efficient minimum mean square error (MMSE) frequency domain equalization (FDE)-based iterative (turbo) packet combining for cyclic prefix (CP)-CDMA MIMO with Chase-type ARQ. We introduce two turbo packet combining schemes: i) In the first scheme, namely ``chip-level turbo packet combining'', chip-level MMSE-FDE and packet combining are jointly performed at the chip-level.
In the second scheme, namely ``symbol-level turbo packet combining'', chip-level MMSE-FDE and despreading are separately carried out for each transmission, then packet combining is performed at the level of the soft demapper. The key idea of the proposed schemes is to exploit the diversity among all transmissions with a very low cost by introducing new variables recursively computed. The complexity and performances are evaluated for some representative antenna configurations and load factors (i.e., number of orthogonal codes with respect to the spreading factor) to show the gains offered by the proposed techniques.

1 : SC - Dépt. Signal et Communications (Institut Mines-Télécom-Télécom Bretagne-UEB)
2 : INPT - Institut national des postes et télécommunications de Rabat (.)
3 : University of Western Macedonia (.)
4 : Lab-STICC - Laboratoire en sciences et technologies de l'information, de la communication et de la connaissance (UMR CNRS 6285 - Télécom Bretagne - Université de Bretagne Occidentale - Université de Bretagne Sud)

Code division multiple access (CDMA), Multi-code transmission, Broadband multiple-input--multiple-output (MIMO), Automatic repeat request (ARQ), Packet combining, Frequency domain methods

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