Method and apparatus for phase modulation of a carrier and application to detection of a multilevel phase encoded digital signal

摘要

A method for phase-modulating a carrier wave is a set of signals sh (t) constituted by a carrier wave having a frequency fC, and the phase φ (t) = hφ0 (t) of the signal sh (t) is sh (t ) = Cos (2πfCt + hφ0 (t)), where h is an integer and φ0 (t) = 2arctan ((t−t0) / w0). The modulation corresponds to a single phase pulse centered at time t0 and having a positive characteristic period w0, and increments the phase of the signal sh (t) by an amount h2π, which is a single sideband frequency. In this mode, the spectrum is directly generated. The carrier wave may be of an electromagnetic type or an acoustic type. Specifically, the method transmits binary information by single sideband phase encoding, generates a single sideband quadrature signal, and detects a single sideband phase encoded multilevel digital signal. Applied to transmitting single sideband phase-encoded binary signals in-phase and non-in-phase, and single sideband amplitude-phase mixed modulation. [Selection] Figure 6