A Rate-Splitting Approach to Fading Channels With Imperfect Channel-State Information
A Rate-Splitting Approach to Fading Channels With Imperfect Channel-State Information
As shown by Médard, the capacity of fading channels with imperfect channel-state information (CSI) can be lower-bounded by assuming a Gaussian channel input $X$ with power $P$ and by upper-bounding the conditional entropy $h(X|Y,\hat{H})$ by the entropy of a Gaussian random variable with variance equal to the linear minimum mean-square …