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This paper considers the use of precoding in MIMO-OFDM systems based on deterministic channel state information at the transmitter (CSIT). The proposed technique combats subcarrier fading using a linear spreading of the source information in the spatial and frequency domains. Unlike previous works, it is assumed that the receiver does not necessarily has to rely on linear processing, allowing in this...
Recent research has shown that code-division multiplex orthogonal frequency-division multiplex (CDM-OFDM) significantly improves the robustness of conventional OFDM against subcarrier fading. In particular, the combination of CDM with multiple transmit antennas has been shown to be very effective in the context of IEEE 802.11n. In this paper another distinctive feature of the forthcoming WLAN standard,...
This paper considers the use of cross-layer MIMO fast link adaption (FLA) algorithms in the context of IEEE 802.11n. An FLA technique based on packet error rate (PER) that makes use of the exponential effective SNR mapping (EESM) is proposed. Additionally, a bit error rate (BER) based FLA scheme is proposed that simplifies the calibration procedure without any significant performance degradation....
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