Bit error rate estimation and error correction and related systems, methods, devices
Physical layer devices and related methods for determining Bit Error Rates (BERs) and correcting errors in signals received through shared transmission media of wireless local area networks are disclosed. A physical layer device is configured to identify coding violations in received signal, determine a rate of the coding violations in the signal, and estimate a BER of the signal to be equal to the determined rate of the coding violations. A physical layer device is configured to invert a half symbol immediately preceding or immediately following a coding violation based, at least in part, on signal integrities of the half symbol immediately preceding and the half symbol immediately following the coding violation to correct a bit error.
1. A physical layer device, comprising:
an input to receive a signal from a shared transmission medium of a wired local area network, the shared transmission medium of the wired local area network comprising a physical medium that is a communication path between nodes that are part of the wired local area network, the nodes including respective instances of physical layer devices; and
one or more processors to, at the physical layer device and in a physical layer of an Open Systems Interconnection (OSI) model:
identify coding violations in the signal received via the shared transmission medium of the wired local area network, the coding violations including two-level differential Manchester Encoding (DME) violations wherein signal transitions are not detected at respective clock transitions;
determine a rate of the coding violations in the signal; and
estimate a bit error rate of the signal to be the determined rate of the coding violations.
2. The physical layer device of claim 1 , the one or more processors to correct one or more half symbols adjacent to the identified coding violations in the signal.
3. The physical layer device of claim 2 , the one or more processors to correct the one or more half symbols based on signal integrities of a preceding symbol preceding the coding violation and a following symbol following the coding violation.
4. A physical layer device, comprising:
an input to receive a signal from a shared transmission medium of a wired local area network, the shared transmission medium of the wired local area network comprising a physical medium that is a communication path between nodes that are part of the wired local area network, the nodes including respective instances of physical layer devices; and
one or more processors to, in a physical layer of an Open Systems Interconnection (OSI) model:
identify a coding violation in the received signal, the coding violation including a two-level differential Manchester Encoding (DME) violation wherein a signal transition is not detected at a clock transition;
determine a preceding signal integrity of a preceding half symbol immediately preceding the coding violation;
determine a following signal integrity of a following half symbol immediately following the coding violation;
select one of the preceding half symbol or the following half symbol based, at least in part, on the preceding signal integrity and the following signal integrity; and
invert the selected one of the preceding half symbol or the following half symbol to correct the received signal.
5. The physical layer device of claim 4 , wherein the signal integrity is a signal amplitude of the preceding half symbol and the following half symbol.
6. The physical layer device of claim 5 , wherein the signal integrity is a difference between a measured amplitude and an expected amplitude.
7. The physical layer device of claim 4 , wherein the signal integrity is a signal waveform shape integrity of the preceding half symbol and the following half symbol.
8. The physical layer device of claim 7 , wherein the signal waveform shape integrity includes a difference between a determined signal waveform shape of the signal and an expected signal waveform shape.
9. A method of estimating a bit error rate (BER) of a signal, the method comprising, in a physical layer of an Open Systems Interconnection (OSI) model:
identifying coding violations in a signal received via a shared transmission medium of a wired local area network, the shared transmission medium of the wired local area network comprising a physical medium that is a communication path between nodes that are part of the wired local area network, the nodes including respective instances of physical layer devices, the coding violations including two-level differential Manchester Encoding (DME) violations wherein signal transitions are not detected at respective clock transitions;
determining a rate of the coding violations in the signal; and
estimating a BER of the signal to be the determined rate of the coding violations in the signal.
10. The method of claim 9 , comprising identifying signal integrities of a half symbol before and of a half symbol after a coding violation.
11. The method of claim 10 , wherein identifying signal integrities of a half symbol before and of a half symbol after a coding violation includes identifying signal amplitude integrities of the half symbol before and of the half symbol after the coding violation.
12. The method of claim 10 , wherein identifying signal integrities of a half symbol before and of a half symbol after a coding violation includes identifying signal waveform shape integrities of the half symbol before and of the half symbol after the coding violation.
13. The method of claim 10 , comprising:
determining that one of the half symbol before or the half symbol after the coding violation has a signal integrity that differs from an expected signal integrity more than the other of the half symbol before or the half symbol after; and
correcting the one of the half symbol before or the half symbol after that has the signal integrity that differs more than the other.
14. The method of claim 13 , wherein correcting the one of the half symbol before or the half symbol after comprises inverting the one of the half symbol before or the half symbol after.
15. A method of performing error correction on a received signal, the method comprising, in a physical layer of an Open Systems Interconnection (OSI) model:
identifying a coding violation in a received signal, the received signal received through a shared transmission medium of a wired local area network, the shared transmission medium of the wired local area network comprising a physical medium that is a communication path between nodes that are part of the wired local area network, the nodes including respective instances of physical layer devices, the coding violation including a two-level differential Manchester Encoding (DME) violation wherein a signal transition is not detected at a clock transition;
determining a preceding signal integrity of a preceding symbol immediately preceding the coding violation;
determining a following signal integrity of a following symbol immediately following the coding violation;
selecting one of the preceding symbol or the following symbol based, at least in part, on the preceding signal integrity and the following signal integrity; and
inverting the selected one of the preceding symbol or the following symbol to correct the received signal.
16. The method of claim 15 , wherein determining the preceding signal integrity and determining the following signal integrity comprises determining signal amplitude integrities of the preceding symbol and the following symbol.
17. The method of claim 15 , wherein selecting one of the preceding symbol or the following symbol based, at least in part, on the preceding signal integrity and the following signal integrity comprises selecting the one of the preceding symbol or the following symbol that has an amplitude that is furthest from an expected amplitude.
18. The method of claim 15 , wherein determining the preceding signal integrity and determining the following signal integrity comprises determining signal waveform shape integrities of the preceding symbol and the following symbol.