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Efficient constant envelope orthogonal modulation

Constant envelope orthogonal frequency division multiplexing (CE-OFDM) is a method to revise the OFDM signal with high peak to average power ratio (PAPR) to a constant envelope 0 dB PAPR waveform. Our new constant envelope modulation technique, presented previously as “M-ary time orthogonal” (CE-MTO) is studied in the frequency domain. The data symbols are multiplied by orthogonal waveforms, to generate M-ary waveforms. Symbol error rate (SER) and power spectral density (PSD) are analyzed and compared to those of the CE-OFDM technique. It is shown that the error rate and the spectrum are very similar. Although the results of the spectral line width and bit error probability are the same, the computational complexity and implementation of the CE-MTO is much simpler.