Methods, systems, and apparatus, including computer pro grams encoded on a computer
storage medium, for modu lating and demodulating transpositional modulated (TM) signals.
One aspect features a method of modulating a carrier signal that includes the operations of
generating a non-transpositional modulation (non-TM) signal from a first data signal, where
the non-TM signal has a frequency spectrum that occupies a bandwidth. Generating a TM
signal by generating a modulation from a second data signal, and shifting the modulation …

Methods, systems, and apparatus, including computer programs encoded on a computer
storage medium, for modulating and demodulating transpositional modulated (TM) signals.
One aspect features a method of modulating a carrier signal that includes the operations of
generating a non-transpositional modulation (non-TM) signal from a first data signal, where
the non-TM signal has a frequency spectrum that occupies a bandwidth. Generating a TM
signal by generating a modulation from a second data signal, and shifting the modulation …