The Origins of and Advances in Modulation Technology
Before the invention of Transpositional Modulation, radio technology had only three fundamental ways of enabling a radio wave to carry information:
Amplitude Modulation (AM)
This method maps information onto a carrier wave by varying the amplitude of the carrier wave before it is transmitted. In other words, it changes the height of the carrier sine wave along its course at a fixed interval.
Frequency Modulation (FM)
This method uses steps that are fundamentally similar to AM, except the information is encoded onto the carrier wave by varying the frequency rather than the amplitude of the wave. Frequency modulation varies the interval between the peaks and troughs of a sine wave throughout its course.
Phase Modulation (PM)
This method produces a waveform very similar to that produced in FM, and is therefore often seen as a variant of FM. “Spliced sections” of an AM or FM signal (or combinations of the two) are taken and shifted strategically along a carrier wave in patterns that are recognized and decoded by the PM demodulator at the receiver’s end.
Bringing Modulation into the 21st Century
Prior to the invention of Transpositional Modulation (TM), modulation methods in the 20th century relied exclusively on the technology developed in the early- to mid-20th century. Today’s standards like PSK, FSK, ASK and QAM, among others, are simply ingenious adaptations of AM, FM or PM.
TM Technologies’ chief scientist, Richard Gerdes, invented TM which is the ﬁrst fundamentally new method of data encoding and transmission since the 1930s.