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The asymptotic capacity at low input powers of an average- power limited or an average- and peak-power limited discrete- time Poisson channel is considered. For a Poisson channel whose dark current is zero or decays to zero linearly with its average input power ??, capacity scales like ?? log 1/?? for small ??. For a Poisson channel whose dark current is a nonzero constant, capacity scales, to within...
Discrete-time Rayleigh fading multiple-input multiple-output (MIMO) channels are considered, with no channel state information at the transmitter and receiver. The fading is assumed to be correlated in time and independent from antenna to antenna. Peak and average transmit power constraints are imposed, either on the sum over antennas, or on each individual antenna. In both cases, an upper bound and...
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