A new Hybrid ARQ scheme based on Blind Separation Sources over MIMO system in multipaths radio fading channel

In this paper, we propose a new scheme of Hybrid ARQ (Automatic Repeat reQuest) strategy, based on Blind Separation Sources over Multi Input Multi Output (MIMO) architecture. In the classical HARQ case, when the received packet is erroneous, the system should send a NACK to ask the transmitter to re-send the same packet. Known that in this case, the receiver could use different copies of the emitted signal to ensure a combination of ARQ, we propose in our approach to transmit different copies of the same packet, but simultaneously over multiple antennas, in order to provide a MIMO system. This approach makes possible the recovering of the erroneous packets, by using the received copies instead of asking for a retransmission, which is very time- and treatment- consuming. The temporary diversity is assured by applying the interleaver to each copy of the transmitted packet, as well as the determination of the emitted signal´s copies by using the Blind Separation Sources (BSS) concepts, without prior information about the transmission channel. The simulations show that the proposed scheme provides good results in term of frame error rate.