In this paper, we present the results from over-the-air experiments of a complete implementation of an amplify and forward cooperative communications system. Our custom OFDM-based physical layer uses a distributed version of the Alamouti block code, where the relay sends one of the branches of Alamouti encoded symbols. First we show analytically and experimentally that amplify and forward proto...

We investigate the application of the Alamouti SpaceTime Block Code (STBC) on basis of the GSM/GPRS system, especially with regard to aspects of compatibility with current specifications. The performance improvements obtainable by means of this technique are demonstrated on basis of simulation results. A novel trellis-based soft-output equalization and detection algorithm for the Alamouti schem...

Space-time coding is a powerful way to leverage spatial diversity gain and improve reliability in multiple input multiple output (MIMO) communication systems. In this paper, we examine a semi-blind adaptive time-domain equalization (TEQ) strategy in conjunction with Alamouti space-time coding to achieve channel shortening. Channel shortening is necessary when the channel response is longer than...

In this paper, we present the results from over-the-air experiments of a complete implementation of an amplify and forward cooperative communications system. Our custom OFDM-based physical layer uses a distributed version of the Alamouti block code, where the relay sends one branch of Alamouti encoded symbols. First we show analytically and experimentally that amplify and forward protocols are ...

The popular Alamouti orthogonal space time code attains full transmit diversity in multiple antenna systems. This paper addresses the problem of blind channel identification in (2 × 1) Alamouti coded systems. Under the assumption of independent symbol substreams, the channel can be estimated from the eigendecomposition of matrices composed of secondor higher-order statistics (cumulants) of the ...

In this paper, we present a synchronous multicarrier code division multiple access scheme for the uplink. We apply interleaved and block spreading schemes for Rayleigh and Rice fading channels. Enhancing diversity in the uplink is feasible by applying transmit diversity schemes. Therefore, we compare cyclic delay diversity (CDD) with the Alamouti scheme. Increasing the number of transmit antenn...

In this paper we propose a transmission concept that combines phase hopping and space-time coding to enable efficient multi-antenna transmission. The proposed space-time code can be considered as a non-orthogonal construction, a sibling of the ABBA code proposed in [7]. The transmission concept proposed here has the advantage that is can be utilized on top of the Alamouti code, essentially with...

ELECT The symbol pairwise error probability performance of the Alamouti space-time block code (STBC-Alamouti) and the STBC from the coordinate interleaved orthogonal design (STBC-CIOD) over Nakagami-m fading channels is investigated, especially with residual phase estimation error (PEE). The derived union upper bounds on the average BER are utilised to evaluate the effect of the residual PEE on...

High-rate optimized linear dispersion (LD) codes have been investigated extensively in theory and by simulation throughout the last years. Regardless of the findings of the research so far, little work has been performed to investigate the performance of such codes in a realistic transmission system. We implemented an optimized full-rate full-diversity space-time block code, derived by Damen, o...