Résumé: In this letter, we discuss the geometrical properties of a transmission scheme with orthogonal space-time codes. In particular, we show that the transmission channel can be interpreted as the rotation of a vector of transmit symbols in a Euclidean space, together with an attenuation and additive noise. We show that the receiver-as intuitively obvious-essentially has to perform a back-rotation. This geometrical interpretation applies to real vector spaces of signals, i.e., the complex transmit and receive symbols have to be split up into their real and imaginary parts.

Langue: Anglais