A method of transmitting an On-Off Keying, OOK, signal which comprises an ON waveform and an OFF waveform forming a pattern representing transmitted binary information as a Manchester code, the method comprising for one binary value of information to be transmitted, providing a first set of complex-valued frequency domain symbols to an inverse fast Fourier transformer, or for the other binary value of information to be transmitted, providing a second set of complex-valued frequency domain symbols to the inverse fast Fourier transformer; performing the inverse fast Fourier transform to form an orthogonal frequency division multiplex, OFDM representation, including a cyclic prefix, of the OOK signal of information to be transmitted; and transmitting the OFDM representation, wherein a subset of available subcarriers is populated by the applied set of symbols and other available subcarriers are nulled, and the set of complex-valued frequency domain symbols populates 12 subcarriers of the OFDM representation, a null, 0+i0, is provided for populating at least one subcarrier, and corresponds to a 256 QAM symbol, wherein the first set of complex-valued frequency domain symbols provides the following complex values for the respective subcarrier: subcarrier complex value -6 -5-5i -5 -11+5i -4 -3+15i -3 13+13i -2 15-3i -1 3-9i 0 0 1 9-3i 2 3-15i 3 -13-13i 4 -15+3i 5 -5+ 11i 6 5+5i and the second set of complex-valued frequency domain symbols provides the following complex values for the respective subcarrier: subcarrier complex value -6 5-5i -5 -5+11i -4 -3-15i -3 13+13i -2 -15-3i -1 9-3i 0 0 1 -3+9i 2 -3-15i 3 13+13i 4 -15-3i 5 11-5i 6 -5+5i where i indicates quadrature and the numbers represents a relative position in a signal constellation of the 256 QAM symbol. for one binary value of information to be transmitted, providing a first set of complex-valued frequency domain symbols to an inverse fast Fourier transformer, or for the other binary value of information to be transmitted, providing a second set of complex-valued frequency domain symbols to the inverse fast Fourier transformer; performing the inverse fast Fourier transform to form an orthogonal frequency division multiplex, OFDM representation, including a cyclic prefix, of the OOK signal of information to be transmitted; and transmitting the OFDM representation, wherein a subset of available subcarriers is populated by the applied set of symbols and other available subcarriers are nulled, and the set of complex-valued frequency domain symbols populates 12 subcarriers of the OFDM representation, a null, 0+i0, is provided for populating at least one subcarrier, and corresponds to a 256 QAM symbol, wherein the first set of complex-valued frequency domain symbols provides the following complex values for the respective subcarrier: subcarrier complex value -6 -5-5i -5 -11+5i -4 -3+15i -3 13+13i -2 15-3i -1 3-9i 0 0 1 9-3i 2 3-15i 3 -13-13i 4 -15+3i 5 -5+ 11i 6 5+5i and the second set of complex-valued frequency domain symbols provides the following complex values for the respective subcarrier: subcarrier complex value -6 5-5i -5 -5+11i -4 -3-15i -3 13+13i -2 -15-3i -1 9-3i 0 0 1 -3+9i 2 -3-15i 3 13+13i 4 -15-3i 5 11-5i 6 -5+5i where i indicates quadrature and the numbers represents a relative position in a signal constellation of the 256 QAM symbol.