Rician MIMO capacity of sea-surface scattered underwater acoustic channel

The effect of Rician Factor(RF) and spatial correlation on the Ricean MIMO capacity is studied based on the sea-surface scattered underwater acoustic Rician fading channel.The spatial correlation of the sea-surface scattered signal is derived with the integrel of Helmholtz-Kirchhoff and the Fresnel app-roximation.We find that covariance matrix of this channel cannot be expressed as the Kronecker product of the transmit correlation function and the receive correlation function.Therefore dependence of MIMO capacity on RF,received SNR and the factors affecting spatial correlation such as element spacing and wind speed are studied through Monte Carlo simulation.From the simulation results of the outage capacity and CCDF of the capacity,the MIMO capacity of Rician channels is not always lower than that of the Rayleigh channels.When there are strong spatial correlations and low receive SNR,fading is more significant in the MIMO channels.For a small number of transmitting and receiving elements,the Rician MIMO capacity composed mainly of deterministic LOS signal will be greater than the Rayleigh fading MIMO capacity.