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It has been shown that the rank and the determinant of the distance matrices are the design criteria for space-time trellis codes over quasi-static Rayleigh fading channels. Recently, a new design criterion that maximizes only the trace has been proposed for systems with a large product of the numbers of transmit and receive antennas. This criterion is… (More)
Addition of AlMe3 to commercial THF solutions of RZnX (R = aryl, functionalised aryl, vinyl; X = Br, I) simultaneously promotes Schlenk equilibria (leading to competent nucleophiles) and the formation of an Al-Zn-ligand catalyst delivering 80-90% ee for Ar(1)CH(OH)Ar(2) formation from aldehydes.
Space-time codes are usually generated using a generator matrix with 2 columns and mod 4 operations for QPSK modulation with two transmit antennas. A Z<sub>4</sub> convolutional code has also been used to represent these space-time codes. Another way of representing them is to use a conventional binary convolutional code of rate 2/4. The space-time code… (More)