Diagonal STBC's for fading ISI channels: code design and equalization

Authors:
Robert Schober;Wolfgang H. Gerstacker;Lutz H.-J. Lampe;Subbarayan Pasupathy
Affiliations:
Department of Electrical and Computer Engineering, University of British Columbia;Institute for Mobile Communication, University of Erlangen-Nuernberg;Department of Electrical and Computer Engineering, University of British Columbia;Department of Electrical and Computer Engineering, University of Toronto
Venue:
Wireless communications systems and networks
Year:
2004

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Abstract

In this chapter, we design and optimize matrix-symbol-based space-time block codes (STBC's) for transmission over fading intersymbol interference (ISI) channels. We show that STBC's employing diagonal code matrices exclusively facilitate the successful application of suboptimum equalization techniques for the practically important case when only a single receive antenna is available. Three different types of diagonal STBC's are optimized for fading ISI channels and their performances are compared for decision-feedback equalization (DFE) and decision-feedback sequence estimation (DFSE), respectively. The robustness of the designed codes against variations of the characteristics of the fading ISI channel and the dependence of the equalizer performance on the STBC structure are investigated.It is shown that for data rates ofR ≤ 2 bits/(channel use) and typical multipath fading channels diagonal STBC's outperform Alamouti's code if suboptimum equalization schemes are adopted.