Similarly, FDMA systems must use a guard band between adjacent channels, due to the unpredictable Doppler shift of the signal spectrum because of user mobility. The guard bands will reduce the probability that adjacent channels will interfere, but decrease the utilization of the spectrum.
Similarly FDMA systems must use a guard band between adjacent channels due to the unpredictable Doppler shift of the signal spectrum because of user mobility The guard bands will reduce the probability that adjacent channels will interfere but decrease the utilization of the spectrum