April 2013
Beginner
480 pages
23h 17m
English
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5 Codes and coding formats
With all forms of signal transmission, it is important to minimise the effects of noise, which is essentially an information destroyer. With analogue systems, this effect can be quantified by the signal to noise voltage, current or power ratio (see Noise, p. 232). In digital systems where the information is transmitted in binary digits or bits, of fundamental On/Off, mark/space or 1/0 elements, a similar concept can be applied. In this case the parameter is measured in terms of energy/bit per watt of noise power/hertz (Eb/N0). If the noise power becomes comparable with the energy in each bit, then bit errors are produced. Thus the degradation of digital signal to noise ratio leads to a bit error rate. The Morse Code ...
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