WALSH ENCODING FOR PERIPHERAL SENSOR INTERFACE 5

• US 20160218749A1
• Filed: 01/23/2015
• Published: 07/28/2016
• Est. Priority Date: 01/23/2015
• Status: Active Grant

• Current Assignee: Infineon Technologies AG
• Original Assignee: Infineon Technologies AG
• Inventors: LEVY, David
• Granted Patent: US 9,647,680 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H03M 5/145 Conversion to or from block codes or representations thereof
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04J 13/0048 Walsh

Abstract

A sensor may encode data using a first encoding scheme. The first encoding scheme may include encoding a data bit, included in the data, using a first chip sequence that corresponds to a first set of current levels. A second encoding scheme may be used by another sensor to encode other data. The second encoding scheme may include encoding a data bit, included in the other data, using a second chip sequence that corresponds to a second set of current levels. The first chip sequence and the second chip sequence being different chip sequences. The sensor may modulate a current, based on the first set of current levels, to provide the encoded data.

Claims

1. A sensor, comprising:

one or more components to;

encode data using a first encoding scheme,

the first encoding scheme including encoding a data bit, included in the data, using a first chip sequence that corresponds to a first set of current levels,

where a second encoding scheme is used by another sensor to encode other data,

the second encoding scheme including encoding a data bit, included in the other data, using a second chip sequence that corresponds to a second set of current levels,

the first chip sequence and the second chip sequence being different chip sequences; and

modulate a current, based on the first set of current levels, to provide the encoded data.

2. The sensor claim 1, where the sensor is connected to a control unit via a Peripheral Sensor Interface.

3. The sensor of claim 1, where the first encoding scheme is associated with a column of a Walsh matrix and the second encoding scheme is associated with another column of the Walsh matrix.

4. The sensor of claim 1, where the one or more components, when modulating the current to provide the encoded data, are to:

encode the data bit, included in the data, across multiple chips, associated with the data bit, in correspondence with a column of a Walsh matrix.

5. The sensor of claim 1, where the one or more components are configured to modulate the current to form a first modulated current in a first time slot of a plurality of time slots,

where the other sensor is configured to modulate the current to form a second modulated current in a second time slot of the plurality of time slots,

where a time slot margin between the first time slot and the second time slot is less than or equal to zero.

6. The sensor of claim 1, where the one or more components, when modulating the current to provide the encoded data are to:

modulate the current based on a current level, of the first set of current levels, during a first chip associated with the data bit included in the data,

the first set of current levels including a first current level and a second current level, and

the current level being the first current level or the second current level; and

modulate the current based on another current level, of the first set of current levels, during a second chip associated with the data bit included in the data,

the other current level being the first current level or the second current level.

7. The sensor of claim 1, where the one or more components are further to:

output a neutral current when the sensor is not providing any encoded data,

the neutral current being at a current level that is different than current levels included in the first set of current levels.

8. A control unit, comprising:

a receiver to;

receive encoded data provided by a sensor,

the encoded data having been encoded by the sensor based on an encoding scheme associated with a portion of a Hadamard matrix; and

decode the encoded data using the portion of the Hadamard matrix.

9. The control unit of claim 8, where the portion of the Hadamard matrix is a first column of a first order Walsh matrix or a second column of the first order Walsh matrix.

10. The control unit of claim 8, where the portion of the Hadamard matrix is a first column of a second order Walsh matrix, a second column of the second order Walsh matrix, a third column of the second order Walsh matrix, or a fourth column of the second order Walsh matrix.

11. The control unit of claim 8, where the receiver is configured to:

determine a set of current values that represents the encoded data;

determine a set of values from the portion of the Hadamard matrix; and

combine the set of current values and the set of values to obtain a correlation score associated with the encoded data; and

where the receiver, when decoding the encoded data is configured to;

decode the encoded data based on the correlation score.

12. The control unit of claim 8, where the sensor is configured to output encoded data in a first time slot of a plurality of time slots, and

where another sensor is configured to output other encoded in a second time slot of the plurality of time slots,

the other encoded data having been encoded by the other sensor using another portion of the Hadamard matrix to form the other encoded data, and

where a time slot margin between the first time slot and the second time slot is less than or equal to zero;

and

where the receiver is to;

receive the other encoded data provided by the other sensor; and

decode the other encoded data using the other portion of the Hadamard matrix.

13. The control unit of claim 8, where the encoded data is first encoded data, the sensor is a first sensor, and the portion of the Hadamard matrix is a first portion of the Hadamard matrix;

where the receiver is further configured to;

receive second encoded data from a second sensor,

the second encoded data being at least partially concurrently received with the first encoded data, and

the second encoded data having been encoded by the second sensor using a second portion of the Hadamard matrix to form the second encoded data,

the second portion of the Hadamard matrix being different than the first portion of the Hadamard matrix; and

decode the second encoded data using the second portion of the Hadamard matrix.

14. The control unit of claim 8, where the receiver receives the encoded data in the form of a modulated current formed by the sensor.

15. A method, comprising:

encoding, by a first sensor, first data using a first encoding scheme,

the first encoding scheme including encoding a data bit, included in the first data, based on a first chip sequence that corresponds to a first set of current levels;

encoding, by a second sensor, second data using a second encoding scheme,

the second encoding scheme including encoding a data bit, included in the second data, based on a second chip sequence that corresponds to a second set of current levels,

the first chip sequence being different than the second chip sequence; and

decoding, by a control unit, the encoded first data based on the first encoding scheme and the encoded second data based on the second encoding scheme.

16. The method of claim 15, where the first sensor and the second sensor are connected to the control unit via a Peripheral Sensor Interface.

17. The method of claim 15, where the first encoding scheme or the second encoding scheme correspond to a first column of a first order Walsh matrix or a second column of the first order Walsh matrix.

18. The method of claim 15, where the first encoding scheme or the second encoding scheme correspond to a first column of a second order Walsh matrix, a second column of the second order Walsh matrix, a third column of the second order Walsh matrix, or a fourth column of the second order Walsh matrix.

19. The method of claim 15, where decoding the encoded first data comprises:

determining a set of current values that represents the encoded first data;

determining a set of values associated with the first encoding scheme; and

combining the set of current values and the set of values to obtain a score associated with the encoded first data; and

decoding the encoded first data based on the score.

20. The method of claim 15, further comprising:

outputting, by the first sensor, a neutral current when the first sensor is not providing any encoded data; and

outputting, by the second sensor, the neutral current when the second sensor is not providing any encoded data,

the neutral current being at a current level that is different than current levels included in the first set of current levels and the second set of current levels.