Antenna Diversity System with Dynamic Phase Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing antenna diversity systems for ultra-short-wave radio reception in vehicles face challenges in achieving sufficient diversity efficiency with a small number of antennas, particularly in reducing adjacent-channel interference, which has become dominant due to the increase in radio stations and overlapping frequency channels.
Innovation Solution
An antenna diversity system that combines the signals from at least two antennas using a processor to adjust the magnitude and phase of the linear combination of antenna feed signals, optimizing the desired signal-to-interference ratio by evaluating interference and sending an interference indication signal to the processor, which uses a search algorithm to adjust the weighting of the signals in real-time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a small number of antennas (two antennas) is used in the antenna diversity system, then the cable expenditure and system complexity are reduced, but the diversity efficiency is insufficient and adjacent-channel interference cannot be adequately reduced
Solution Approach 1:
The patent implements dynamic adjustment of magnitude and phase angles for antenna feed signals through a processor. The system continuously evaluates interference in reception signals and adjusts the complex weighting factors (magnitude and phase) in real-time to optimize the desired signal-to-interference ratio. This dynamic adaptation enables two antennas to achieve diversity efficiency comparable to or exceeding that of systems with more antennas, resolving the contradiction between reduced cable expenditure and maintained reliability.
2Device complexity
If the antenna diversity module is positioned near a compact multi-antenna system (e.g., on the rear window), then the cable expenditure is minimized, but the ability to achieve sufficient diversity efficiency with only two antennas is compromised
Solution Approach 1:
The patent changes the parameters of the antenna feed signals by adjusting both magnitude and phase angles through complex weighting factors. The processor evaluates interference levels and dynamically modifies these parameters to maximize the desired signal-to-interference ratio. This parameter adjustment capability allows the system to achieve effective interference suppression even with limited antennas in a compact configuration, addressing the contradiction between minimal cable expenditure and interference reduction.
3Ease of manufacture
If traditional antenna diversity systems are used without processor-based adjustment, then the system is simpler and more cost-effective, but the diversity efficiency is insufficient for reducing adjacent-channel interference
Solution Approach 1:
The patent implements a feedback mechanism where the evaluation circuit continuously monitors interference in reception signals and provides this information to the processor. The processor uses this feedback to dynamically adjust the magnitude and phase angles of antenna feed signals, creating a closed-loop control system. This feedback-driven approach enables precise interference evaluation and suppression while maintaining system cost-effectiveness, resolving the contradiction between manufacturing simplicity and interference evaluation accuracy.
Data Source
AI summary
There is an antenna diversity system for radio reception in moving vehicles which includes a receiver, and at least two antennas coupled to the receiver. These antennas transmit antenna feed signals to an antenna diversity module coupled between the receiver and the antennas. In at least one embodiment, the antenna diversity module comprises at least one evaluation circuit for evaluating an interference in a reception signal, and at least one processor for adjusting a magnitude and a phase angle of a linear combination of the antenna feed signals. The evaluation circuit reads and sends an interference indication signal to the processor to create a relatively low interference signal. Thus, the diversity module combines the antenna feed signals in an adjustable manner based on an magnitude of phase angle, to form a linear combined signal that is present at the output of the antenna diversity module as a reception signal.