LDPC-based space-time coded OFDM systems: Turbo-EM receiver design with channel state information guessing algorithms |
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Authors: | Guillaume Ferré Mohamad Jamalullil Syed Jean-Pierre Cances Vahid Meghdadi Jean-Michel Dumas |
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Affiliation: | 1. Groupe d’étude des Systèmes de Télécommunications de I’ensil (UMOP/GESTE CNRS FRE 2701), Université de Limoges — école Nationale Supérieure d’Ingénieurs de Limoges (ENSIL), 16, Rue Atlantis, Parc ester, BP 6804, 87068, Limoges cedex, France
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Abstract: | In this paper we study some turbo receiver architectures employing low-density parity check (Ldpc) codes together with orthogonal frequency division multiplexing (Ofdm) for high data rate wireless transmissions. Different demodulation schemes based on expectation-maximization (Em) algorithm are studied along with the channel impulse response (Em) algorithms. We studied differentCir guessing algorithms including the EM-based algorithms such as a space-alternating generalized expectation-maximization algorithm (Sage). It is shown that the proposed turbo-Em receiver employing a soft maximum a posteriori (Map)Em demodulator and a belief propagationLdpc decoder can perform within 1 dB from the ergodic capacity of the studiedMimo ofdm channels. Besides, we find that a suboptimum structure based on a soft interference cancellationMmse filtering demodulator exhibits negligible loss in non-correlated fadingMimo channels but suffer extra performance loss in highly correlatedMimo channels. |
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