MIMO generalized decorrelating discrete-time RAKE receiver

In this paper, we introduce a generalized decorrelating discrete-time RAKE receiver for MIMO systems (MIMO GD-DTR). The MIMO GD-DTR system is a combination of two other advanced MIMO RAKE reception methods: the jointly decoding generalized rake receiver (JD-GRAKE) and the MIMO decorrelating discrete-time RAKE reception (MIMO D-DTR). The JD-GRAKE has been proposed for correlated interference suppression in MIMO systems and it is obtained from the single antenna generalized RAKE receiver (G-RAKE). The MIMO D-DTR, which is obtained from the single antenna decorrelating discrete-time RAKE (D-DTR) system, improves the performance in the presence of channel estimation errors in diffuse channels. The MIMO GD-DTR combines the complementary advantages of both the JD-GRAKE and the MIMO D-DTR. It suppresses the interference, and takes into consideration the imperfect channel state information at the receiver. Our results show that the performance of the discrete-time version of the MIMO JD-GRAKE could be worse than a conventional RAKE receiver, when there are channel estimation errors in the system, whereas proposed MIMO GD-DTR provides gains up to 1.7 dB at a bit error rate of 10^-2 in 3 transmit 3 receive antenna system (3×3).