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A Level     Communication     >Cell Phones<     FDM     Infrared     Media     TDM    

Communication Cell Phones


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The Technology

Mobile Phone Mast

Mobile phone technology is advancing fast so parts of this page may quickly become out-of-date.

Costs on a Cellular Network

Cells

Portable Mobile Phone Mast

Time Division Multiplexing

Time Slices

Each phone channel can be used by up to eight phones, each getting a time share of one eigth. By rapid switching between the phones, the callers can not tell that this is happening.

Frequency Division Multiplexing

Each phone mast or base station uses several frequencies simultaneously to allow more phones to share the mast.

Space Division Multiplexing

Directional antennas allow the same frequencies to be used by more phones. This relies on the directional behavious of the cell mast antennas.

Mobile Cell Frequency Reuse

Micro-Cell

This image shows a highly directional circularly polarised mobile phone antenna pointing into a railway tunnel so travellers are not cut off when the train passes through. This is a nice example of a micro-cell covering a small area.

Mobile Phone access In Tunnel

Sampling

When an analogue signal is converted to digital, it is measured or sampled at regular time intervals.

Sampling: The sampling rate must be at least twice the highest frequency being sampled. ( Nyquist Frequency )

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