In cellular mobile communication systems, the signal coverage area is divided into individual cells, which can be hexagonal, square, circular, or some other shape, usually hexagonal honeycomb. Each of these partitions is assigned multiple frequencies (f1-f6) with corresponding base stations. In other partitions, duplicate frequencies can be used, but adjacent partitions cannot use the same frequency, which can cause interference on the same channel. Increase capacity. Compared with a single base station, cellular mobile communication systems can use the same frequency to complete different data transmissions (frequency multiplexing) in different partitions. A single base station can only have one data transmission on the same frequency. However, the use of the same frequency in cellular mobile communication systems inevitably interferes with other base stations using the same frequency. This means that in a standard FDMA system, there must be a different frequency base station between two base stations using the same frequency
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