Abstract—Diagonal Bell Laboratories Layered Space-Time (DBLAST)

structure offers a low complexity solution to realize the

attractive capacity of Multiple-input and multiple-output (MIMO)

systems. In this paper, we apply D-BLAST in orthogonal frequency

division multiplexing (OFDM) systems and address the issue of

channel estimation. Different other MIMO-OFDM, where

symbols at all tones are always available for decision-directed

channel estimation, in D-BLAST OFDM, we update estimated

channel parameters each time a layer is detected with a least

square (LS) approach, using a pieced combination of received signals

at previous and current OFDM blocks. The initial estimate is

further refined by a robust estimator to exploit the time correlation

of channel parameters among OFDM blocks. Computer simulation

results show the performance improvement over block-wise

channel estimation. It is also shown that D-BLAST with proposed

channel estimation is robust to fast fading of channel parameters.-Abstract—Diagonal Bell Laboratories Layered Space-Time (DBLAST)

structure offers a low complexity solution to realize the

attractive capacity of Multiple-input and multiple-output (MIMO)

systems. In this paper, we apply D-BLAST in orthogonal frequency

division multiplexing (OFDM) systems and address the issue of

channel estimation. Different　other MIMO-OFDM, where

symbols at all tones are always available for decision-directed

channel estimation, in D-BLAST OFDM, we update estimated

channel parameters each time a layer is detected with a least

square (LS) approach, using a pieced combination of received signals

at previous and current OFDM blocks. The initial estimate is

further refined by a robust estimator to exploit the time correlation

of channel parameters among OFDM blocks. Computer simulation

results show the performance improvement over block-wise

channel estimation. It is also shown that D-BLAST with proposed

channel estimation is robust to fast fading of channel parameters.