A multithreaded convolution implementation based on block algorithms is considered. Convolution essentially the basis of many methods that solve problem determining degree similarity or independence two processes, in other words, when it necessary to determine correlation. The algorithm itself executed with a significant delay, because for its execution accumulate entire signal and then process...

Space-time block codes from orthogonal designs recently proposed by Alamouti, and TarokhJafarkhani-Calderbank have attracted considerable attention due to the fast maximum-likelihood (ML) decoding and the full diversity. There are two classes of space-time block codes from orthogonal designs. One class consists of those from real orthogonal designs for real signal constellations which have been...

We investigate space-frequency block coding for OFDM systems with multiple transmit antennas, where coding is applied in the frequency domain (OFDM carriers) rather than in the time domain (OFDM symbols). In particular we consider Alamouti’s code, which was shown to be the optimum block code for two transmit antennas and time domain coding. We show that the standard decoding algorithm results i...

In this paper we present a new family of fullrate space–time block codes for 4 × 2 MIMO. We show how, by combining algebraic and quasi-orthogonal properties of the code, reduced-complexity maximum-likelihood decoding is made possible. In particular, the sphere decoder search can be reduced from a 16to a 12-dimensional space. Within this family, we found a code that outperforms all previously pr...