Abstract
In this paper transmitter antenna diversity for the downlink of a cellular system is proposed in conjunction with optimum anti-fading diversity. In spectrally efficient transmitter antenna, frequency and time diversity schemes the information bit stream is divided into sub-streams and each sub-stream is transmitted over a different antenna, a different frequency, or a different time slot. The present work provides a fading resistant transmission scheme where a base station uses M1 antennas and M2 time slots M=M1+M2. These transmissions are coordinated to mitigate the effects of multi-path Rayleigh fading and the mobile receiver can recover the entire M-dimensional transmitted vector as long as the signal energy of at least one coordinate is large enough. The Selective Transmitter Antenna Diversity (space diversity) scheme is coordinated with new Orthonormal Complex Rotation Matrices (time diversity) to get the highest BER performance for low and medium signal to noise ratio. Orthonormal Complex Rotation Matrices with variable and maximum peak to average amplitude ratio (PAR) are presented. The modulations considered in this work are QPSK, 8PSK and 16QAM.
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