As mentioned previously, Raleigh fading is frequency dependent. This means that the fading dips occur at different-places for different frequencies. To benefit from this, it is possible for the BTS and MS to hop from frequency to frequency during a call. The frequency hopping of the BTS and MS is synchronized.
In GSM there are 64 patterns of frequency hopping, one of them is a simple cyclic or sequential pattern. The remaining 63 are known as pseudo-random patterns, which an operator can choose from.
In GSM there are 64 patterns of frequency hopping, one of them is a simple cyclic or sequential pattern. The remaining 63 are known as pseudo-random patterns, which an operator can choose from.
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