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by Wolfgang H. Gerstacker, Frank Obernosterer, Robert Schober, Alexander Lehmann, Alexander Lampe, Peter Gunreben
http://www.lnt.de/LNT2/papers/asst_entz.ps.gz
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Abstract:
In this paper, we develop receiver concepts for transmission with spacetime block codes (STBC's) over frequencyselective fading channels. The focus lies on Alamouti's spacetime block coding scheme, but the results may be generalized to other STBC's. We show that a straightforward combination of conventional equalizers and a spacetime block decoder is only possible if at least as many receive antennas as transmit antennas are employed, but not for the practically interesting case of pure transmit diversity for which spacetime coding has been originally developed. This restriction is circumvented by our approach. Here, the structural properties of the transmit signal of spacetime block coding, which is shown to be improper (rotationally variant), are fully utilized. For this, equalizers with widely linear (WL) processing are designed, i.e., a widely linear equalizer (LE) and a decisionfeedback equalizer (DFE) with widely linear feedforward and feedback ltering. These schemes are especially suited for equalization of highlevel modulated signals, which are used in thirdgeneration timedivision multiple access mobile communications standards such as EDGE (Enhanced Data Rates for GSM Evolution). It is shown that the standard detector for Alamouti's STBC may be also viewed as a special case of a widely linear detector. Simulation results demonstrate that the proposed concepts may be successfully employed in an EDGE receiver, especially for pure transmit diversity. Here, signicant gains can be observed compared to a conventional singleinput singleoutput (SISO) transmission.
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