JPWO2021042107A5

JPWO2021042107A5 -

Info

Publication number: JPWO2021042107A5
Application number: JP2022510902A
Authority: JP
Publication date: 2023-08-10
Anticipated expiration: 2040-08-04

Claims

A physical layer device,
a comparator configured to compare a signal to a threshold, said signal being received from a shared transmission medium of a wired local area network;
A signal quality indicator (SQI) circuit, comprising:
adjusting the threshold to obtain bit error rates of the output of the comparator corresponding to a plurality of different thresholds during a plurality of different time periods , wherein the plurality of different thresholds are during the plurality of different time periods; an SQI circuit configured to correspondingly adjust and determine a signal-to-noise ratio (SNR) of the signal based on the bit error rate for the plurality of different thresholds . and, including, physical layer devices.

The SQI circuit is
adjusting the threshold to a first value to obtain a first bit error rate of the output of the comparator during a first time period;
adjusting the threshold to a second value to obtain a second bit error rate of the output of the comparator during a second time period;
and determining the SNR of the signal based on the first bit error rate and the second bit error rate.

2. The physical layer device of claim 1, further comprising receiving circuitry configured to process the signal received from the shared transmission medium.

3. The receiving circuit of claim 1, wherein the receiving circuit includes a receiving comparator configured to compare the signal to an intermediate threshold level, the intermediate threshold level being midway between a logic level high and a logic level low of the signal. 4. The physical layer device of claim 3 .

2. The physical layer device of claim 1, wherein the SQI circuitry is further configured to determine a bit error rate (BER) of the signal based on the SNR of the signal.

further comprising a data storage device in which transform data is stored, the transform data including a plurality of SNR values and a plurality of BER values corresponding to the plurality of SNR values; From the SNR values, determine the BER of the signal by identifying one of the SNR values that is closest to the determined SNR of the signal, and determine the corresponding BER from the plurality of BER values. 6. The physical layer device of claim 5 , configured to select as the BER of a signal.

further comprising a data storage device in which transformed data is stored, said transformed data comprising a plurality of SNR values and a plurality of pairs of bit error rate (BER) values corresponding to said plurality of SNR values; The SQI circuit is adapted to determine the SNR of the signal by selecting one of the plurality of SNR values corresponding to a BER pair closest to a first bit error rate and a second bit error rate. 2. The physical layer device of claim 1, wherein the physical layer device is configured to:

2. The physical layer device of claim 1, wherein the physical layer device is configured to report SQI information including the SNR of the signal to the wired local area network via the shared transmission medium.

2. The SQI circuit of claim 1, wherein the SQI circuit is configured to determine the SNR of the signal in one of a carrier sense multiple access/collision detection (CSMA/CD) mode or a physical layer collision avoidance mode. physical layer device.

2. The physical layer device of claim 1, wherein the SQI circuitry is configured to determine SNRs of signals received from multiple different senders.

2. The physical layer device of claim 1, wherein the SQI circuitry is configured to determine the SNR of the signal when the signal is determined to have been received from a given particular sender.

A physical layer device, the physical layer device comprising:
a comparator configured to compare a signal to a threshold, said signal being received from a shared transmission medium of a wired local area network;
an additional comparator configured to compare the signal to an additional threshold;
An SQI circuit, the SQI circuit comprising:
adjusting the threshold to obtain bit error rates of the output of the comparator corresponding to a plurality of different thresholds;
adjusting the threshold to a first value to obtain a first bit error rate of the output of the comparator during a period of time;
adjusting the additional threshold to a second value to obtain a second bit error rate of the output of the additional comparator during the time period;
a SQI circuit configured to: determine a signal-to-noise ratio (SNR) of the signal based on the first bit error rate and the second bit error rate. device.

A method of estimating the signal-to-noise ratio (SNR) of a signal, comprising:
setting a threshold of a comparator of the physical layer device to a first value;
applying a signal to the comparator, the signal being received from a communication bus of a wired local area network, the communication bus comprising a shared transmission medium;
determining a first number of bit errors in the output of the comparator with the threshold set to the first value;
setting the threshold of the comparator to a second value different from the first value;
applying the signal to the comparator;
determining a second number of bit errors in the output of the comparator with the threshold set to the second value;
determining an SNR of the signal based on the first number of bit errors and the second number of bit errors.

14. The method of claim 13, further comprising determining a bit error rate of said signal based on said determined SNR.

4. The claim further comprising storing transform data comprising a plurality of bit error rates corresponding to a plurality of SNRs, wherein determining a bit error rate of said signal comprises referencing said stored transform data. 14. The method according to 14.

further comprising storing, in a data storage device, transformed data comprising a plurality of SNRs corresponding to a combination of a first bit error count and a second bit error count, wherein determining the SNR comprises the stored 14. The method of claim 13, comprising referencing transformed data to correspond the first number of bit errors and the second number of bit errors to SNRs from the plurality of SNRs stored in the transformed data. the method of.

determining the first number of bit errors in the output of the comparator with the threshold set to the first value;
adjusting the first value of the threshold higher if the determined first number of bit errors is less than a first predetermined threshold value;
adjusting the first value of the threshold lower if the determined first number of bit errors is greater than a second predetermined threshold value;
replacing the first number of bit errors with a replacement value measured while applying the signal to the comparator with the threshold set to the adjusted first value. 14. The method of claim 13.

the comparator includes a first comparator and a second comparator;
Determining the first number of bit errors in the output of the comparator with the threshold set to the first value comprises setting the first threshold of the first comparator to the first value. determining the first number of bit errors in a first output of the first comparator being executed;
Determining the second number of bit errors in the output of the comparator with the threshold set to the second value comprises: setting the second threshold of the second comparator to the second value; 14. The method of claim 13, comprising determining the second number of bit errors in the second output of the second comparator that has been set.

Determining the first number of bit errors in the first output of the first comparator includes performing the second threshold of the second comparator with the second threshold set to the second value. 19. The method of claim 18, performed at least partially concurrently with the step of determining the second number of bit errors in the output of .

determining said first number of bit errors in said output of said comparator with said threshold set to said first value; and determining said output of said comparator with said threshold set to said second value. 14. The method of claim 13, wherein determining the second number of bit errors is performed at least partially concurrently.

determining said first number of bit errors in said output of said comparator with said threshold set to said first value; and determining said output of said comparator with said threshold set to said second value. 14. The method of claim 13, wherein determining the second number of bit errors is performed over discrete time periods.

A physical layer device,
one or more processors;
One or more data storage devices having computer readable instructions stored thereon, the computer readable instructions instructing the one or more processors to:
setting a threshold of the comparator of the physical layer device to a first value while a signal is applied to the comparator of the physical layer device, the signal being received from a communication bus of a wired local area network; and the first value is different from an intermediate threshold value that is intermediate between logic voltage levels of the signal, and the communication bus comprises a shared transmission medium;
determining a first number of bit errors in the output of the comparator with the threshold set to the first value;
setting the threshold of the comparator to a second value while the signal is applied to the comparator, the second value being different from the first value and the intermediate threshold value; different things and
determining a second number of bit errors in the output of the comparator with the threshold set to the second value;
determining a signal-to-noise ratio (SNR) of the signal based on the first number of bit errors and the second number of bit errors. A physical layer device, including a device.

23. The physical layer device of claim 22, further comprising a semiconductor chip package housing said one or more processors and said one or more data storage devices.

23. The computer readable instructions of claim 22, further configured to instruct the one or more processors to determine a bit error rate (BER) of the signal based on the SNR of the signal. A physical layer device as described.