Capacity Bounds for Amplitude-Constrained AWGN MIMO Channels with Fading

We evaluate capacity bounds for multiple-input multiple-output (MIMO) additive white Gaussian noise (AWGN) fading channels subject to input amplitude constraints. We focus on two practical cases, in which the transmitter: (i) employs a single antenna amplifier, which induces a constraint on the norm of the input vector, and (ii) it employs multiple amplifiers, one per antenna, which leads to independent constraints on the amplitude of each input vector entry. For both cases, we evaluate the asymptotic capacity gap between upper and lower bounds at high signal-to-noise ratio.

Proponiamo bound per la capcità di canali MIMO AWGN con fading soggetti a vincoli di ampiezza. <Ci concentriamo su due casi pratici con un singolo amplificatore o con un amplificatore per antenna. In entrambi i casi calcolaimo i gap asintotici tra upper e lower bound all'aumentare dell'SNR.