System and method for timing recovery in high bandwidth communications
Systems and methods for extracting and identifying timing information from wireless signals can include a signal receiver configured to receive a communications signal; a finite impulse response (FIR) filter coupled to the signal receiver and configured to identify a set of transitions in the communications signal; an absolute value operation module coupled to the FIR filter and configured to detect energy in each of the set of transitions within the communications signal; and a comb filter coupled to the absolute value operation module and configured to combine the detected energy in each of the set of transitions within the communications signal. Exemplary systems can also include a cyclic accumulator coupled to the comb filter and a signal processor.
1. An apparatus comprising:
a signal receiver configured to receive a communications signal and generate a discrete-time sampled communications signal;
a finite impulse response filter coupled to the signal receiver and configured to identify a set of signal characteristics comprising one of simple transitions or fixed patterns in the discrete-time sampled communications signal;
an absolute value operation module coupled to the finite impulse response filter and configured to detect energy in each of the set of signal characteristics within the discrete-time sampled communications signal;
a comb filter coupled to the absolute value operation module and configured to combine the detected energy in each of set of signal characteristics within the discrete-time sampled communications signal;
a signal processor; and
a maximum magnitude module configured to:
identify the time-index with the largest magnitude of the combined detected energy; and
in response to accumulation of the combined detected energy, transmit a set of clock and data recovery (CDR) parameters to the signal processor.
2. The apparatus of claim 1 , wherein the maximum magnitude module is coupled to the comb filter.
3. The apparatus of claim 1 , further comprising:
a cyclic accumulator coupled to the comb filter and the maximum magnitude module and configured to accumulate the combined detected energy from the comb filter over a set of time offsets.
4. The apparatus of claim 1 , wherein the signal receiver comprises a one-bit analog to digital converter (ADC).
5. The apparatus of claim 2 , wherein the signal receiver comprises a one-bit analog to digital converter (ADC).
6. The apparatus of claim 3 , wherein the signal receiver comprises a one-bit analog to digital converter (ADC).
7. The apparatus of claim 1 , wherein the signal receiver comprises an antenna and the communication signal comprises a radio frequency signal.
8. The apparatus of claim 2 , wherein the signal receiver comprises an antenna and the communication signal comprises a radio frequency signal.
9. The apparatus of claim 3 , wherein the signal receiver comprises an antenna and the communication signal comprises a radio frequency signal.
10. The apparatus of claim 4 , wherein the signal receiver comprises an antenna and the communication signal comprises a radio frequency signal.
11. The apparatus of claim 5 , wherein the signal receiver comprises an antenna and the communication signal comprises a radio frequency signal.
12. The apparatus of claim 6 , wherein the signal receiver comprises an antenna and the communication signal comprises a radio frequency signal.
13. A method comprising:
at a communication system, receiving a communications signal;
by the communication system, identifying a set of signal characteristics comprising one of simple transitions or fixed patterns in the communications signal;
by the communication system, detecting energy in each of the set of signal characteristics within the communications signal;
by the communication system, combining the detected energy in each of the set of signal characteristics within the communications signal via using a comb filter;
by the communication system:
accumulating the combined detected energy from the comb filter; and
in response to accumulation of the combined detected energy, transmitting a set of CDR parameters to a signal processor.
14. The method of claim 13 , wherein the communication system comprises a one-bit analog to digital converter (ADC).
15. The method of claim 13 , further comprising, by the communication system:
identifying the time-index with the largest magnitude.
16. The method of claim 13 , wherein the signal receiver comprises an antenna and the communication signal comprises a radio frequency signal.
17. The method of claim 14 , wherein the signal receiver comprises an antenna and the communication signal comprises a radio frequency signal.
18. The method of claim 15 , wherein the signal receiver comprises an antenna and the communication signal comprises a radio frequency signal.
19. The method of claim 13 , further comprising:
in response to receiving the communications signal, generating a discrete-time sampled communications signal.