High resolution signal reception
A method for reception of a signal by a subscriber of a real-time network. The signal includes a signal clock having a signal clock frequency and the subscriber includes a counter, which has a counter clock with a counter clock frequency and which maps a local time of the subscriber. The method includes sampling the signal with a reception clock of a reception counter of the subscriber, the reception clock being derived from the counter clock, whereby the reception counter maps the local time of the subscriber, adapting a phase position of the reception clock to a phase position of the signal clock when said reception clock is derived from the counter clock, and sampling the signal at a reception clock frequency of the reception counter.
1. A method for reception of a signal by a subscriber of a real-time network, the signal comprising a signal clock having a signal clock frequency and the subscriber comprising a counter, which includes a counter clock having a counter clock frequency and which maps a local time of the subscriber, the method comprising:
sampling the signal with a reception clock of a reception counter of the subscriber, the reception clock being derived from the counter clock, whereby the reception counter maps the local time of the subscriber,
adapting a phase position of the reception clock to a phase position of the signal clock when said reception clock is derived from the counter clock, and
sampling the signal at a reception clock frequency of the reception counter.
2. The method according to claim 1 , wherein the reception clock is derived from the counter clock using a phase-locked loop.
3. The method according to claim 1 , wherein the reception clock frequency of the reception clock corresponds to a counter clock frequency of the counter clock.
4. The method according to claim 1 , wherein a reception clock frequency of the reception clock is a multiple of a counter clock frequency of the counter clock.
5. The method according to claim 1 , wherein a sign of a phase shift between the reception clock and the signal clock is determined, and
further comprising, based on the determined sign of the phase shift, changing the phase position of the reception clock in order to adapt the phase position of the reception clock to the phase position of the signal clock.
6. The method according to claim 5 , further comprising changing the phase position of the reception clock for each reception clock period.
7. The method according to claim 1 , further comprising changing the phase position of the reception clock per reception clock period by shifting said phase position by a positive or negative phase increment.
8. The method according to claim 1 , further comprising changing a counter reading of the reception counter analogously to the phase position of the reception clock.
9. The method according to claim 1 , wherein the subscriber reconstructs the signal clock from the signal.
10. The method according to claim 9 , wherein the signal is line-coded.
11. The method according to claim 10 , wherein the signal is coded with the 8B10B line coding.