Hi dariush,
A digital design with a clock frequency of 10GHz is today nearly impossible. Look at actual CPU's: even these devices are running on frequencies below 3GHz...
If in future digital devices for such frequencies will be available, they surely will be clocked with a much lower frequency (e.g 100MHz) and multiplicate the clock internally with a PLL (all modern CPU's today do this). So your board design will be much slower. But also at these "low" frequencies you have to take care about line impedances, matched linelengths and correct terminations.
Bye