Relative to designs assuming no channel knowledge at the transmitter, considerably improved communications become possible when adapting the transmitter to the intended propagation channel. As perfect knowledge is rarely available, transmitter designs based on partial channel state information (CSI) are of paramount importance not only because they are more practical, but also because they encompass the perfect- and no-knowledge paradigms. Relying on partial CSI, this paper designs adaptive orthogonal frequency division multiplexed (OFDM) transmissions, that maximize the transmission rate over frequency-selective multi-input multi-output (MIMO) fading links. The adaptive transmitter pameters include beamformer weights and their power per OFDM subcarrier, as well as the power and bit loading across OFDM subcarriers. Our simulations confirm that adaptive two-directional beamforming combined with adaptive MIMO OFDM improves the transmission rate considerably.
|Original language||English (US)|
|Title of host publication||2003 4th IEEE Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2003|
|Publisher||Institute of Electrical and Electronics Engineers Inc.|
|Number of pages||5|
|State||Published - 2004|
|Event||4th IEEE Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2003 - Rome, Italy|
Duration: Jun 15 2003 → Jun 18 2003
|Name||IEEE Workshop on Signal Processing Advances in Wireless Communications, SPAWC|
|Other||4th IEEE Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2003|
|Period||6/15/03 → 6/18/03|
Bibliographical notePublisher Copyright:
© 2003 IEEE.