![]() ![]() ![]() More elaborate schemes appear in the late 18th century, including the noteworthy optical telegraph invented by the French physicist Claude Chappe (1791) these large signaling towers transmitted coded words (rather than letters) over long distances, and were developed in the following years into a large network over major cities in France and surrounding countries. Early coding schemes can be attributed to the british scientist Robert Hooke for inventing large mobile panels coding the letters of the alphabet (1684). Many textbooks begin with a good historical overview of wireless communications and excellent insights (see for instance ), and we will not attempt to reproduce them let us simply summarize in a few statements the major innovations in wireless system.Įarly smoke signals and carrier pigeons may of course be seen as a form of wireless communications, but offer little modern interst. This chapter introduces digital wireless communications systems and the spectrum landscape. ![]()
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