Signal conversion system for sending or receiving a radiofrequency signal
System for converting a radiofrequency signal S RX so as to recover encoded information carried by the signal S RX , includes generating elements arranged to generate a signal S LO , mixing elements ( 3 ) arranged to generate a signal S RX-LO by mixing the signal S RX with the signal S LO , an analog/digital converter arranged to convert the signal S RXLO into a digital signal S RX-LO-Num , a device generating an error correction digital signal S Cor , the device being arranged so that the signal S Cor reflects the phase gap between the phase of the signal S LO and a phase setpoint, the phase setpoint being the phase of an ideal signal S 0 , ideal for recovering the encoded information carried by the signal S RX , combining elements arranged to generate the signal S 0′-Num by combining the signal S RX-LO-Num with the signal S Cor . A system for converting a digital signal so as to send a radiofrequency analog signal carrying the information of the digital signal is also described.
1. A system for converting a received radiofrequency signal S RX in order to recover encoded data carried by signal S RX , comprising:
generating means arranged so as to generate a signal S LO ;
mixing means arranged so as to generate a signal S RX-LO by mixing signal S RX and signal S LO ;
an analog/digital converter arranged so as to convert signal S RX-LO into a digital signal S RX-LO-Num ;
a device generating an error correction digital signal S Cor , the device being arranged so that digital signal S Cor reflects a phase gap between the phase of signal S LO and a phase setpoint, the phase setpoint being a phase of an ideal signal S 0 , ideal for recovering the encoded information carried by signal S Rx ; and
combination means arranged to generate signal S 0′-Num by combining signal S RX-LO-Num with digital signal S Cor .
2. A system for converting a digital signal S TX-Num in order to emit a radiofrequency analog signal S TX carrying the digital signal S TX-Num information, comprising:
generation means arranged so as to generate a signal S LO ;
a device generating an error correction digital signal S Cor , the device being arranged so that digital signal S Cor reflects a phase gap between signal S LO phase and a phase setpoint, the phase setpoint being the phase of an ideal signal S 0 , ideal for transposing signal S TX-Num on a frequency required for its emission;
combination means arranged to generate signal S TX-Cor-Num by combining S TX-Num with digital signal S Cor ;
a digital/analog converter arranged to convert digital signal S TX-Cor-Num into an analog signal S TX-Cor ; and
mixing means arranged so as to generate a signal S TX by mixing signal S TX-Cor with signal S LO .
3. The conversion system according to claim 1 , further comprising:
means for generating a reference signal S Ref ; and
sampling means with inputs signal S LO and signal S Ref and arranged so as to generate a digital signal S LO-Num , the digital representation of signal S LO .
4. The conversion system according to claim 3 , wherein the sampling means include a phase sampler and that signal S LO-Num , is a digital representation of the signal phase S LO .
5. The conversion system according to claim 3 , wherein the device includes:
at least one input arranged to receive the characteristics of ideal signal S 0 ,
at least one input arranged to receive digital signal S LO-Num ,
means for calculating an instantaneous phase error between signal S LO and signal S 0 , and
means for generating digital signal S Cor in the form of a reverse phase of the said phase error.
6. The conversion system according to claim 3 , wherein the device includes digital filtering means arranged to filter digital signal S Cor .
7. The conversion system according to claim 6 , wherein the digital filtering means include at least one digital filter, the bandwidth of which can be adjusted.
8. The conversion system according to claim 3 , wherein the device includes correction means arranged so as to correct the imperfections of the sampling means.
9. The conversion system according to claim 1 , wherein the device includes interface means arranged so as to vary the characteristics of ideal signal S 0 .
10. A system for converting a digital signal to receive and emit a radiofrequency analog signal including a system for converting a received radiofrequency signal S RX in order to recover encoded data carried by signal S RX , according to claim 1 and a system for converting a digital signal S TX-Num in order to emit a radiofrequency analog signal S TX carrying the digital signal S TX-Num information, comprising:
generation means arranged so as to generate a signal S LO ;
a device generating an error correction digital signal S Cor , the device being arranged so that digital signal S Cor reflects a phase gap between signal S LO phase and a phase setpoint, the phase setpoint being the phase of an ideal signal S 0 , ideal for transposing signal S TX-Num on a frequency required for its emission;
combination means arranged to generate signal S TX-Cor-Num by combining S TX-Num with digital signal S Cor ;
a digital/analog converter arranged to convert digital signal S TX-Cor-Num into an analog signal S TX-Cor ; and
mixing means arranged so as to generate a signal S TX by mixing signal S TX-Cor with signal S LO .
11. A method for converting a received radiofrequency signal S RX in order to recover encoded information carried by signal S RX , comprising:
generating a signal S LO ;
generating a signal S RX-LO by mixing signal S Rx with signal S LO ;
converting signal S RX-LO into a digital signal S RX-LO-Num ;
generating a digital error correction signal S Cor reflecting a phase gap between signal S LO phase and a phase setpoint, the phase setpoint being the phase of an ideal signal S 0 , ideal for recovery of the encoded information carried by signal S RX ; and
generating a signal S O′-Num by combining signal S RX-LO-Num with digital signal S Cor .
12. A method for converting a digital signal S TX-Num in order to emit a radiofrequency analog signal S TX carrying signal S TX-Num information, comprising:
generating a signal S LO ;
generating a digital error correction signal S Cor reflecting a phase gap between signal S LO phase and a phase setpoint, the phase setpoint being the phase of an ideal signal S 0 , ideal for transposing signal S TX-Num , at a frequency required for its emission;
generating a digital signal S TX-Cor-Num by combining signal S TX-Num with correction signal S Cor ;
converting signal S TX-Cor-Num into an analog signal S TX-Cor ; and
generating signal S TX by mixing signal S TX-Cor with signal S LO .
13. The conversion system according to claim 2 , further comprising:
means for generating a reference signal S Ref ; and
sampling means with inputs signal S LO and signal S Ref and arranged so as to generate a digital signal S LO-Num , the digital representation of signal S LO .
14. The conversion system according to claim 13 , wherein the sampling means include a phase sampler and that signal S LO-Num , is a digital representation of the signal phase S LO .
15. The conversion system according to claim 13 , wherein the device includes:
at least one input arranged to receive the characteristics of ideal signal S 0 ,
at least one input arranged to receive digital signal S LO-Num ,
means for calculating an instantaneous phase error between signal S LO and signal S 0 , and
means for generating digital signal S Cor in the form of a reverse phase of the said phase error.
16. The conversion system according to claim 13 , wherein the device includes the filtering means arranged to filter digital signal S Cor .
17. The conversion system according to claim 16 , wherein the digital filtering means include at least one digital filter, the bandwidth of which can be adjusted.
18. The conversion system according to claim 13 , wherein the device includes correction means arranged so as to correct the imperfections of the sampling means.
19. The conversion system according to claim 2 , wherein the device includes interface means arranged so as to vary the characteristics of ideal signal S 0 .