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The ergodic capacity is a key performance parameter of a multiple-input-multiple-output (MIMO) fading channel. We would like to determine the optimal number of transmit antennas to be used for a given signal-to-noise ratio (SNR) and a given total number of antennas in the system. Thus, we obtain here three simple and tight bounds on the ergodic capacity of the MIMO Rayleigh fading channel, which show...
We derive in this paper the cutoff rate R0 of multiple-input-multiple-output (MIMO) space-time (ST) coding systems operating in Rayleigh fast fading channels with imperfect channel state information at the receiver (CSIR). In contrast to conventional cutoff rate analyzes where R0 is treated as a continuous variable, we highlight in the paper that when the codeword length N is finite, there is a need...
We propose the generalized quadratic receivers (GQRs) for unitary space-time modulation over flat Rayleigh fading channels. The GQRs realize the performance improvement potential, known to be approximately 2-4 dB, between the quadratic receiver (QR) and the coherent receiver (CR), by performing channel estimation without the help of additional training signals that consume additional bandwidth. They...
In this paper, we propose new unitary signal constellations for differential unitary space-time modulations (DUSTM) utilizing more than two transmit antennas. DUSTM is a space-time coding scheme which is apt in a continuous varying channel, and in which the channel state information (CSI) are approximately constant over two code block intervals. The proposed unitary designs are constructed from fundamental...
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