Title :
Computing the capacity of a MIMO fading channel under PSK signaling
Author :
He, Wenyan ; Georghiades, Costas N.
Author_Institution :
Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA
fDate :
5/1/2005 12:00:00 AM
Abstract :
We study the constrained capacity of a multiple-input multiple-output (MIMO) fading channel with a phase-shift keying (PSK) input alphabet and show a uniform prior distribution is capacity achieving. An expression for the capacity is derived which requires a single expectation and can be evaluated easily through simulation. The simulations are facilitated by analytical expressions for the eigenvalues and eigenvectors of a required covariance matrix. The derived expression is used to provide good approximations to the capacity at low signal-to-noise ratios (SNRs) as well as to compare the input-constrained MIMO capacity to the unconstrained MIMO capacity.
Keywords :
MIMO systems; antenna arrays; channel capacity; covariance matrices; eigenvalues and eigenfunctions; fading channels; phase shift keying; telecommunication signalling; MIMO fading channel; PSK signaling; SNR; analytical expression; capacity computing; covariance matrix; eigenvalue-eigenvector; input alphabet; multiple-input multiple-output; phase-shift keying; signal-to-noise ratio; Analytical models; Channel capacity; Closed-form solution; Eigenvalues and eigenfunctions; Fading; Helium; MIMO; Phase shift keying; Rayleigh channels; Transmitters; Capacity-achieving distribution; constrained input; multiple-input multiple-output (MIMO) capacity; phase-shift keying (PSK) signaling;
Journal_Title :
Information Theory, IEEE Transactions on
DOI :
10.1109/TIT.2005.846426