Algebraic inequalities for MIMO-UWB with antenna element time delays: Uncorrelated fading

We consider the transmission rate over the multiantenna ultrawideband channel taking into account antenna element time delays. Some algebraic inequalities are explored to formulate the upper bounds on channel capacity. For an uncorrelated fading, the upper bounds can be derived in closed forms. Numerical examples illustrate that in IEEE 802.15.4a channel model, i) the channel capacity tends to be limited when the number of rays increases, and ii) non-line-of-sight channel provides more capacity than line-of-sight channel.