Vehicle Antenna Uplink Power Control for Intermodulation Mitigation
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Solution Overview
Problem
In vehicles equipped with multiple antennas, signal intermodulation and degradation occur due to simultaneous uplink signal transmission, impacting downlink and uplink throughput.
Innovation Solution
A method and system that determine the current frequency combination of vehicle antennas, retrieve a predetermined cases map to adjust the maximum RF power of antennas using a processor, reducing receiver performance degradation by analyzing and testing different frequency combinations to specify the required uplink RF power reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple antennas transmit uplink signals simultaneously, then communication coverage and capacity are improved, but signal intermodulation and receiver performance degradation occur
Solution Approach 1:
The patent dynamically adjusts the uplink transmit power parameter based on the detected frequency combination of multiple antennas. When intermodulation is detected, the system changes the power parameter to reduce the harmful interaction while maintaining communication capacity. This is achieved through the processor determining frequency combinations and adjusting amplifier output power accordingly.
Solution Approach 2:
The system implements a feedback mechanism where the processor continuously monitors the frequency combinations of signals from multiple antennas, detects intermodulation products, and adjusts the uplink power in response. This closed-loop control ensures that communication capacity is maintained while preventing receiver performance degradation through real-time power adjustment.
2Reliability
If uplink RF power is reduced to minimize interference, then receiver performance degradation is reduced, but uplink throughput may be impacted
Solution Approach 1:
The patent employs dynamic power adjustment rather than static reduction. The system continuously adapts the uplink RF power level based on the current frequency combination and detected intermodulation conditions. This dynamic approach allows the system to maintain high uplink throughput when interference is minimal while reducing power only when necessary to protect receiver performance.
Solution Approach 2:
The power adjustment is applied selectively based on the specific frequency combination causing intermodulation. Rather than uniformly reducing power across all antennas and frequencies, the system targets only the specific antenna combinations and frequency ranges where intermodulation occurs, preserving uplink throughput in unaffected channels while protecting receiver performance in affected channels.
Data Source
AI summary
In an exemplary embodiment, a vehicle includes antennas in proximity to one another; amplifiers; a computer memory; and a computer processor. The amplifiers are coupled to or part of the antennas. The computer memory stores a predetermined cases map that lists, for each of a plurality of combinations of frequencies for antennas, the predetermined cases map specifying, for each combination of frequencies, an amount of uplink RF power reduction required to reduce the degradation below a predetermined threshold. The computer processor is configured to retrieve, from the computer memory, the predetermined cases map; determine a current frequency combination for a current plurality of frequencies of the antennas of the vehicle; and provide instructions to one or more of the amplifiers to adjust a maximum RF power of one or more of the antennas, to thereby reduce receiver performance degradation between the antennas.