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In the multiantenna downlink and under the availability of perfect channel state information (CSI) at base station (BS), regularized channel inversion (RCI) outperforms plain channel inversion (CI). Nevertheless, in the presence of imperfect CSI at BS, since RCI is more sensitive than CI to CSI imperfections, the performance of RCI becomes more degraded than that of CI. Therefore, in this paper, we...
In multiantenna downlink, linear precoders like channel inversion (CI) are more desirable than their nonlinear counterparts due to their reduced complexity. However, to harness the full capabilities of multiuser multiantenna downlink, the availability of perfect channel state information (CSI) at base station (BS) is mandatory. Since from the practical point of view, this is an optimistic assumption,...
This paper proposes a new pre-coding technique called Frequency Division Duplex Time Reversal (FDD TR) for FDD Multiple Input Multiple Output (MIMO) wireless communications which relies on unquantized uncoded channel feedback. This technique is compared in terms of performance and overhead to Time Reversal (TR), 1bit Time Reversal (1bit TR). The performance assessment of a 16x2 MIMO system, is based...
TDD multiuser downlink MIMO channels with delayed channel state information at the transmitter (CSIT) are considered. Block diagonalization is applied at the base station (BS). In order to cope with the inter-user interference caused by the delayed CSIT, we develop a novel capacity estimation method at first and then propose robust delayed CSIT aware multimode selection schemes based on the estimation...
By introducing the leakage concept, the maximum signal-to-leakage-and-noise ratio (SLNR) scheme has been served as a candidate precoding scheme in the advanced long term evolution (LTE-Advanced) communication system. However, the original scheme allocates every user the same transmit power and takes the matched filter to decode the receive signals, which results in the limited bit error rate (BER)...
In this paper, we consider non-linear transceiver designs for multiuser multi-input multi-output (MIMO) downlink in the presence of imperfections in the channel state information at the transmitter (CSIT). The base station (BS) is equipped with multiple transmit antennas and each user terminal is equipped with multiple receive antennas. The BS employs Tomlinson-Harashima preceding (THP) for inter-user...
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