Method and device for phase modulation of a carrier wave and application to the detection of multi-level phase-encoded digital signals

摘要

The method of phase modulating a carrier wave involves creating a set of signals s_h(t) constituted by a carrier wave of frequency f_C and of phase φ(t)=hφ₀(t) that is modulated in time t in such a manner that s_h(t)=cos(2πf_Ct+hφ₀(t)), where h is an integer and where φ₀(t)=2 arctan((t−t₀)/w₀). The modulation corresponds to a single phase pulse centered on a time t₀ of characteristic duration w₀ that is positive, and incrementing the phase of the signal s_h(t) by the quantity h2π, in such a manner as to generate a single sideband frequency spectrum directly. The carrier wave may be of electromagnetic type or of acoustic type. The method applies in particular to transporting binary information by single sideband phase coding, to generating single sideband orthogonal signals, to detecting single sideband phase coded multiple-level digital signals, to transmitting single sideband phase coded binary signals in-phase and out-of-phase, and to single sideband combined amplitude-and-phase modulation.