The cyclic prefix is intended to be long enough to encompass most significant multi-path signals. consider one of the lte cp duration of 4.7us. multi-path delays come from signals traveling longer distances that the shortest path signal. if the shortest path between tc and rx is 1km, what is the distance of the longest traveled multi-path signal if the multi-path delay should be much, much less (factor of 10) than the cp duration? assume signals travel at the speed of light