DEVICE AND METHOD FOR IMPROVING THE RECEPTION QUALITY OF MESSAGES IN A CAN BUS SYSTEM

• US 20150295734A1
• Filed: 11/04/2013
• Published: 10/15/2015
• Est. Priority Date: 11/09/2012
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Nickel, Patrick
• Granted Patent: US 10,581,641 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 12/40 Bus networks
• CPC Class Codes: H04L 2012/40215 Controller Area Network CAN
• CPC Class Codes: H04L 25/0212 of impulse response
• CPC Class Codes: H04L 25/025 using least-mean-square [LMS] method
• CPC Class Codes: H04L 25/03057 with a recursive structure H04L25/03031 takes precedence

Abstract

A user station for a bus system and a method for improving a reception quality of messages in a user station of a bus system are provided. The user station includes an estimation device for estimating a channel impulse response when and/or after only one further user station of the bus system transmits a message to the bus system, or for determining necessary functions of filters directly from a signal received by the user station, and a correction device for correcting a signal received by the user station based on the channel impulse response estimated by the estimation device.

Claims

1-10. -10. (canceled)

11. A user station for a bus system, comprising:

an estimation device for one of;

estimating a channel impulse response at least one of when and after only one further user station of the bus system transmits a message to the bus system, and

determining a necessary function of at least one filter directly from a signal received by the user station; and

a correction device for correcting the signal received by the user station based on the channel impulse response estimated by the estimation device.

13. The user station as recited in claim 11, wherein the estimation device uses at least one of parameters and coefficients of previously received messages during the estimation of the channel impulse response, which as a result of a message identifier are assigned to a user station which has transmitted the received message.

14. The user station as recited in claim 11, wherein the estimation device initially represents a result of the estimation with the aid of hypotheses, and wherein the correction device further processes reception values decided according to a DDFSE algorithm.

15. The user station as recited in claim 11, wherein the correction device corrects the signal received by the user station according to one of a DFE algorithm, a BCJR algorithm, and a DDFSE algorithm.

16. The user station as recited in claim 11, wherein the correction device includes a first filter for correcting the signal received by the user station, and wherein a signal-to-interference power ratio is maximized at a particular reception point in time at an input of the first filter.

17. The user station as recited in claim 16, further comprising:

a further filter for filtering reception values which were previously decided according to a DDFSE algorithm, wherein the correction device feeds back an output of the first filter.

18. The user station as recited in claim 11, further comprising:

a transceiver for a direct connection to a bus line of the bus system; and

a communication control device for processing a signal received by the transceiver and for providing a message to be transmitted by the transceiver in the form of a signal, wherein at least one of the estimation device and the correction device is part of one of the transceiver and the communication control device.

19. A bus system, comprising:

a bus line; and

at least two user stations connected to each other via the bus line in such a way that the user stations are able to communicate with each other, wherein at least one of the at least two user stations including;

an estimation device for one of;

estimating a channel impulse response at least one of when and after only one further user station of the bus system transmits a message to the bus system, and

determining a necessary function of at least one filter directly from a signal received by the user station, and

a correction device for correcting the signal received by the user station based on the channel impulse response estimated by the estimation device.

20. A method for improving a reception quality of a message in a user station of a bus system, comprising:

performing one of;

estimating, with the aid of an estimation device, a channel impulse response at least one of when and after only one further user station of the bus system transmits a message to the bus system, and

determining, with the aid of the estimation device, a necessary function of a filter directly from a signal received by the user station; and

correcting, with the aid of a correction device, the signal received by the user station based on the channel impulse response estimated by the estimation device.