Orthogonally-Multiplexed On-Off-Keyed Modulation

Combining the orthogonal multiplexing signaling and the on-off-keyed signaling, the orthogonallymultiplexed on-off-keyed amplitude modulation (OMOAM) family and the orthogonally-multiplexed on-off-keyed phase modulation (OMOPM) family are proposed and investigated in this paper. Based on the maximum-likelihood principle, the optimum schemes for coherently demodulating OMOAM and OMOPM signals on the additive white Gaussian noise channel are developed. Union bounds are developed to evaluate the bit error probability characteristics of the optimum schemes. The power spectral density characteristics are studied in terms of fractional power containment. The OMOAM and OMOPM schemes are found to provide not only the same trend as, but also significant improvement over, the conventional OMOAM [1] and OMOPM [2] schemes in spectral efficiency, while exhibiting very different trends in power efficiency. The OMOAM and OMOPM families also provide other choices of power and spectral efficiencies than the efficiencies achieved by the OMOAM and OMOPM families.