We investigate the capacity behavior of an OFDM wireless link for the frequency selective MIMO channel with correlated paths. The derivation is based on a particular channel model that characterizes path correlation as well as spatial correlation. As in the case of spatial correlation, path correlation can reduce capacity. If there is no channel knowledge at the transmitter, the capacity reduction of an OFDM based system due to path correlation can be explained in terms of the effective SNR at each tone. With spatial and path correlation information at the transmitter, we derive the optimal space-frequency precoder at every tone by numerical optimization techniques. We propose a sub-optimal precoding scheme with lower complexity which leads to a tight lower bound of the capacity of the OFDM system.
|Title of host publication||IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)|
|Publication status||Published - 3 Dec 2004|
|Event||2004 IEEE Global Telecommunications Conference: Globecom 2004 - Dallas, TX, United States|
Duration: 29 Nov 2004 → 3 Dec 2004
|Conference||2004 IEEE Global Telecommunications Conference|
|Abbreviated title||Globecom 2004|
|Period||29/11/04 → 3/12/04|