Fading-resistant modulation using several transmitter antennas

This paper proposes a bandwidth-eecient fading-resistant transmission scheme which implements transmitter diversity using L antennas at the base station. When the antennas are spaced suuciently far apart, the transmission from each antenna undergoes a diierent degree of fading. These transmissions are coordinated to mitigate the eeects of Rayleigh fading and the mobile receiver can recover the entire L-dimensional transmitted vector signal as long as the signal energy of at least one coordinate is large enough. L-dimensional fading-resistant signal constellations are generated by maximizing a gure of merit for the Rayleigh fading channel. This scheme ooers a signiicant performance improvement over a conventional single-antenna BPSK scheme when coding is ineeective due to slow fading.