Abstract: A system and method in a wireless communications system enables a preferred frequency hopping (FH) sequence to be determined and instituted in real-time. The average speed of mobile stations within a cell is determined or estimated using a variety of techniques. If the average speed is below a predetermined threshold, then a cyclic FH sequence is instituted to achieve superior frequency diversity and therefore combat small-scale fading dips. If the average speed is above a predetermined threshold, then a random FH sequence is instituted to achieve superior interference averaging and therefore combat co-channel interference. Delay timers and a hysteresis may also be used to enhance stability and to counteract short-term fluctuations. The measuring of the average speed and the comparing of the average speed to the threshold are periodically repeated.