Decision-feedback sequence estimation for time-reversal space-time block-coded transmission

TitleDecision-feedback sequence estimation for time-reversal space-time block-coded transmission
Publication TypeJournal Article
Year of Publication2004
AuthorsSchober, R., H. Z. B. Chen, and W. H. Gerstacker
JournalVehicular Technology, IEEE Transactions on
Pagination1273 - 1278
Date Publishedjul.
Keywordsblock codes, cellular radio, channel estimation, decision feedback equalisers, decision feedback sequence estimation, EDGE system, GSM system, intersymbol interference, least mean squares methods, matched filters, mobile communications, prediction error filter, single input single output channel, space-time codes, spatio temporal matched filter, time reversal space time block coded transmission

In this correspondence, we consider three different decision-feedback sequence-estimation (DFSE) schemes originally proposed for single-input-single-output channels for time-reversal space-time block coding (TR-STBC). The first scheme is called unwhitened DFSE (U-DFSE) and performs reduced-state sequence estimation based on the output of the spatio-temporal matched filter (MF), typically employed in TR-STBC. The second approach improves upon U-DFSE by subtracting a bias term caused by anticausal interference from the U-DFSE metric. In the third scheme, the noise component in the output of the spatio-temporal MF is first whitened using a prediction-error filter and, subsequently, whitened DFSE (W-DFSE) is performed. As a relevant example, all three DFSE schemes are compared for the global system for mobile communications/enhanced data rates for GSM evolution (GSM/EDGE) system and typical channel profiles. Our results show that for binary modulation (as used in GSM) U-DFSE and its improved version can approach the performance of W-DFSE for the full range of delay spreads relevant for GSM and EDGE. On the other hand, for high-level modulation (as used in EDGE) only W-DFSE gives a satisfactory performance, if a low trellis complexity is desired.


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