  The capacity of a fixed Gaussian multiple-input multiple-output (MIMO)
channel and the optimal transmission strategy under the total power (TP)
constraint and full channel state information are well-known. This problem
remains open in the general case under individual per-antenna (PA) power
constraints, while some special cases have been solved. These include a
full-rank solution for the MIMO channel and a general solution for the
multiple-input single-output (MISO) channel. In this paper, the fixed Gaussian
MISO channel is considered and its capacity as well as optimal transmission
strategies are determined in a closed form under the joint total and
per-antenna power constraints in the general case. In particular, the optimal
strategy is hybrid and includes two parts: first is equal-gain transmission and
second is maximum-ratio transmission, which are responsible for the PA and TP
constraints respectively. The optimal beamforming vector is given in a
closed-form and an accurate yet simple approximation to the capacity is
proposed. Finally, the above results are extended to the MIMO case by
establishing the ergodic capacity of fading MIMO channels under the joint power
constraints when the fading distribution is right unitary-invariant (of which
i.i.d. and semi-correlated Rayleigh fading are special cases). Unlike the fixed
MISO case, the optimal signaling is shown to be isotropic in this case.
