Space–time block codes: trained, blind, and semi-blind detection

Abstract

Space–time block coding (STBC) is a recent breakthrough solution to the a combined semi-blind scheme whose performance affecting the channel is fairly slow. To capitalize on the advantages of and performance. To alleviate the data rate reduction we introduce a at the transmit site. An additional appealing property of STBC is that available to either site. The performance loss corresponding to the blind detection scheme that is a natural extension of the ML detector blind scheme, however, turns out to be significant unless the fading briefly a trained detection scheme that uses a block of pilot symbols to channels. communication system without requiring knowledge of the channel matrix decoupled form. However, STBC requires knowledge of the channel gain estimate the channel. Such a scheme incurs a reduction in both data rate for STBC to the case where channel state information (CSI) is not is shown to be considerably better than that of the trained-detection matrix at the receive site. In this paper, we present and contrast three problem of fully exploiting the spatial diversity of a multi-antenna scheme (using exact CSI at the receiver), for reasonably slow fading scheme and in fact quite close to the performance of the clairvoyant schemes that avoid the previous requirement of STBC. First, we discuss the associated maximum-likelihood (ML) detector has a very simple the two aforementioned schemes and smooth out their drawbacks we propose.