Device and method for improving the reception quality of messages in a CAN bus system
First Claim
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1. A user station for a bus system, comprising:
- a receiver for receiving a signal from the bus system;
an estimation device for 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;
a correction device for correcting the signal received by the user station based on the channel impulse response estimated by the estimation device; and
a decider device that is supplied with the corrected signal and decides bit states for the corrected signal, wherein the correction device includes;
a first filter in which a main tap thereof is eliminated and in which a transmission function thereof corresponds to a z-transform of the channel impulse response,a second filter that receives the signal from the bus system and has a second transmission function, andan addition stage device, wherein an output of the first filter corresponding to a modeled interference and an output of the second filter are supplied to the addition stage device in which the modeled interference is subtracted from the output of the second filter, and wherein an output of the addition stage device is supplied to the decider device.
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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.
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Citations
12 Claims
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1. A user station for a bus system, comprising:
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a receiver for receiving a signal from the bus system; an estimation device for 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; a correction device for correcting the signal received by the user station based on the channel impulse response estimated by the estimation device; and a decider device that is supplied with the corrected signal and decides bit states for the corrected signal, wherein the correction device includes; a first filter in which a main tap thereof is eliminated and in which a transmission function thereof corresponds to a z-transform of the channel impulse response, a second filter that receives the signal from the bus system and has a second transmission function, and an addition stage device, wherein an output of the first filter corresponding to a modeled interference and an output of the second filter are supplied to the addition stage device in which the modeled interference is subtracted from the output of the second filter, and wherein an output of the addition stage device is supplied to the decider device. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A bus system, comprising:
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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 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, a correction device for correcting a signal transmitted on the bus and received by the user station, the correcting being based on the channel impulse response estimated by the estimation device; and a decider device that is supplied with the corrected signal and decides bit states for the corrected signal, wherein the correction device includes; a first filter in which a main tap thereof is eliminated and in which a transmission function thereof corresponds to a z-transform of the channel impulse response, a second filter that receives the signal from the bus system and has a second transmission function, and an addition stage device, wherein an output of the first filter corresponding to a modeled interference and an output of the second filter are supplied to the addition stage device in which the modeled interference is subtracted from the output of the second filter, and wherein an output of the addition stage device is supplied to the decider device. - View Dependent Claims (8, 9)
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10. A method for improving a reception quality of a message in a user station of a bus system, comprising:
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receiving, by the user station, a signal from the bus system; 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; 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; and supplying the corrected signal to a decider unit device that decides bit states for the corrected signal, wherein the estimating correcting includes; providing a first filter in which a main tap thereof is eliminated and in which a transmission function thereof corresponds to a z-transform of the channel impulse response, providing a second filter that receives the signal from the bus system and has a second transmission function, and providing an addition stage device, wherein an output of the first filter corresponding to a modeled interference and an output of the second filter are supplied to the addition stage device in which the modeled interference is subtracted from the output of the second filter, and wherein an output of the addition stage device is supplied to the decider device. - View Dependent Claims (11, 12)
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Specification