Data Modulation and Demodulation Method and Data Communication System Using Orthogonal Hypothesis / Sweep Waveform

摘要

This method uses orthogonal sinusoidal waveform and improves the conventional data modulation method which uses only orthogonal cosine waveform. This method superposes the modulation signal which is obtained by the cosine modulation method and the modulation signal which is obtained by the sine modulation method. Two modulation signals are transmitted simultaneously. The data sequence (a) is used for generation of the modulation signal using orthogonal cosine waveform. The data sequence (c) is used for generation of the modulation signal using orthogonal sine waveform. The signal (e) is sum of (a), (c).