Communication using continuous-phase modulated signals

摘要

Embodiments of a circuit are described. In this circuit, a modulation circuit provides a first modulated electrical signal and a second modulated electrical signal, where a given modulated electrical signal, which can be either the first modulated electrical signal or the second modulated electrical signal, includes minimum-shift keying (MSK) modulated data. Moreover, a first phase-adjustment element, which is coupled to the modulation circuit, sets a relative phase between the first modulated electrical signal and the second modulated electrical signal based on a phase value of the first phase-adjustment element. Additionally, an output interface, which is coupled to the first phase-adjustment element, is coupled to one or more antenna elements which output signals. These signals include a quadrature phase-shift-keying (QPSK) signal corresponding to the first modulated electrical signal and the second modulated electrical signal.

主权项

1. A method of transmitting signals, comprising:
generating a first modulated electrical signal and a second modulated electrical signal, wherein the first modulated electrical signal and the second modulated electrical signal are modulated using minimum-shift keying (MSK); setting a defined phase difference between the first modulated electrical signal and the second modulated electrical signal to produce a phase-adjusted first modulated electrical signal; transmitting a quadrature phase-shift-keying (QPSK) modulated signal by transmitting the phase-adjusted first modulated electrical signal with a first polarization via a first antenna element, and transmitting the second modulated electrical signal with a second polarization, different from the first polarization, via a second antenna element.