Vehicle Antenna Gain Control for Cable Attenuation Compensation
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Solution Overview
Problem
In communication systems for motor vehicles, signal attenuation in the cable between the transceiver unit and the antenna complicates the determination of transmission gain values, requiring extensive wiring and connection complexity to compensate for this attenuation.
Innovation Solution
A communication apparatus with a controllable amplifier device and power detector at the antenna end of the cable, where the control device sets the transmission gain based on power values captured between the antenna end and the antenna, allowing for attenuation compensation without additional wiring to the transceiver end.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If an amplifier device is used to compensate for cable attenuation, then the transmission signal power is restored, but the wiring complexity and connection requirements increase due to the need for transceiver measuring circuit wiring to the control device
Solution Approach 1:
The antenna arrangement performs self-calibration by autonomously determining the actual transmission signal power at the antenna using its own power detector device, eliminating the need for transceiver measuring circuits to be wired to the control device. The control device receives power values only from the antenna end, allowing the system to self-compensate for cable attenuation without external intervention or complex wiring.
Solution Approach 2:
The measurement point is moved from the transceiver end to the antenna end of the cable, changing the spatial dimension of power detection. This allows the control device to receive power values directly from the antenna arrangement via the existing cable infrastructure, eliminating the need for additional measuring line wiring between the transceiver and control device.
2Measurement precision
If power values are captured at the transceiver end, then the transmission signal power is known, but additional measuring lines and wiring to the control device are required
Solution Approach 1:
The antenna arrangement autonomously measures the actual transmission signal power using its own power detector device and self-determines the cable attenuation, eliminating the need for the transceiver to perform measurements and wire the control device to its measuring circuits. The system serves itself by performing the calibration function at the antenna end.
Solution Approach 2:
Instead of measuring power at the transceiver end and transmitting that information to the control device, the system inverts the approach by measuring power at the antenna end and using that measurement directly at the control device location. This reverses the traditional measurement direction and eliminates the need for additional wiring.
3Extent of automation
If multiple transmission signals with different power levels are used, then the system can determine actual power values for calibration, but the complexity of managing multiple power levels increases
Solution Approach 1:
The power detector device continuously monitors the actual transmission signal power at the antenna end and feeds this information back to the control device. The control device uses this feedback to automatically determine cable attenuation and adjust the amplifier device accordingly, creating a closed-loop self-calibration system that manages multiple power levels automatically without manual intervention.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution simplifies circuit complexity by allowing self-calibration of the antenna arrangement to compensate for cable attenuation, reducing the need for additional measuring lines and enabling efficient transmission and reception signal amplification.
Implementation Method 1
a power detector device (15) for capturing a respective power value (29) correlated with a power of the transmission signals (5) at a tapping point (28)
Implementation Method 2
a controllable amplifier device (8) for amplifying the transmission signals (5) transmitted via the cable (7)
Data Source
AI summary
The present disclosure relates to communication systems for a motor vehicle. In some embodiments, a communication device may provide, for example, car-to-car communication (vehicle-to-vehicle communication). A communication system for a motor vehicle, the system may include: a transceiver unit for generating transmission signals where at least two of the transmission signals differ in their signal power; a cable to transmit the transmission signals to an antenna via a controllable amplifier device; a power detector device capturing a respective power value correlated with a power of the transmission signals at a tapping point between the cable and the antenna; and a control device controlling the amplifier device on the basis of the captured power values. The transceiver device generates at least one of the transmission signals with a predetermined reference power. A reference value describing the reference power is permanently predefined in the control device. The control device selects one of the power values as an actual value of the power of the transmission signal generated with the reference power at the tapping point and sets a transmission gain value of the amplifier device on the basis of a discrepancy between the reference value and the actual value.