Carrier recovery analog system for a receiver of a N-PSK signal
AssigneeCommissariat A L'energie Atomique Et Aux Energies Alternative
InventorsAlexandre Siligaris, Cedric Dehos, Jose-Luis Gonzalez Jimenez, Clement Jany, Baudouin Martineau
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Abstract
A carrier recovery system for a receiver of a phase-modulated signal N-PSK, the system including a first pre-conditioning circuit of the signal received (S(t)), with the pre-conditioned signal (SP(t)) having a component, non-modulated in phase, at the frequency Nƒc where ƒc is the carrier used for the modulation N-PSK, and a carrier regeneration circuit to regenerate two sinusoidal signals in quadrature at the frequency ƒc, with these signals being phase locked with respect to said non-modulated component in phase of the pre-conditioned signal.
Claims13
A carrier recovery system for coherent receiver to receive a phase-modulated signal, S(t), by an N-PSK modulation of a carrier where N is an even number, the carrier recovery system comprising:
- a signal pre-conditioning circuit for supplying a pre-conditioned signal having a non-modulated component with a harmonic Nƒc of a carrier frequency ƒc, said non-modulated component at Nƒc being obtained by multiplication of the phase-modulated signal and of
- K
- =
- N
- 2
- -
- 1
- delayed versions of the signal by respective delays
- k
-
- T
- c
- N
- ,
- with k=1, . . . , K, each delay being defined to a nearest integer multiple of
- T
- c
- 2
- ,
- where Tc=1/ƒc, with a result of said multiplication being subjected to a quadratic function;
- and
- a carrier regeneration circuit for generating a sinusoidal signal at the carrier frequency phase locking onto said harmonic.
Dependencies are inferred from the claim text.