Antenna Diversity for Proximity Detection Accuracy
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Solution Overview
Problem
Existing methods for determining the relative position of a mobile radio to its base station, such as using received signal strength indication (RSSI), are prone to errors due to signal nulls and peaks caused by multi-path interference, leading to incorrect proximity state determinations.
Innovation Solution
Implementing a system with multiple antennas at the base radio, utilizing antenna diversity and adaptive channel error gating to reduce the impact of multi-path interference, and using a processor-controlled antenna switch to measure RSSI values from multiple antennas, generating an average RSSI value for more accurate proximity determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If RSSI measurement is used to determine relative position, then proximity detection is simple and cost-effective, but measurement precision deteriorates due to signal nulls and peaks from multi-path interference
Solution Approach 1:
The patent segments the single RSSI measurement into multiple measurements taken from spatially diverse antennas. Instead of relying on one antenna's RSSI reading which may be affected by multi-path interference, the system divides the measurement task across multiple antennas to obtain a more representative sample of the actual signal strength, thereby improving proximity detection accuracy while maintaining system simplicity.
Solution Approach 2:
The patent introduces a spatial dimension to the RSSI measurement by utilizing multiple antennas positioned at different locations. This transforms the measurement from a single-point observation to a multi-point spatial sampling approach, allowing the system to distinguish between true signal variations due to distance and false variations caused by multi-path interference patterns.
2Measurement precision
If multiple antennas are used to reduce multi-path interference, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent merges the functionality of multiple antennas into a unified proximity detection system where the antennas work together rather than independently. By combining RSSI measurements from multiple antennas and processing them through a single proximity determination algorithm, the system achieves improved measurement precision without proportionally increasing overall system complexity, as the core processing architecture remains unified.
Solution Approach 2:
The multiple antennas serve dual purposes: they provide diversity for improved proximity detection accuracy while also maintaining backward compatibility with existing single-antenna operation modes. The system can adaptively select between using one or multiple antennas based on availability and conditions, making the enhanced functionality universal rather than adding specialized complexity for specific scenarios.
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 approach significantly reduces the frequency and duration of incorrect proximity state determinations, providing a reliable and improved method for determining the proximity of a mobile radio to its base station by minimizing the adverse effects of signal nulls and peaks.
Implementation Method 1
the phasing of any reflected radio waves received, where the reflected radio waves are referred to as multi-path
Implementation Method 2
the direct line of sight and reflection path distances between transmitter and receiver
Data Source
AI summary
Methods and apparatuses for radio proximity detection are disclosed. In one example, a method for determining a proximity of a mobile radio includes determining an initial range of a mobile radio in relation to a base radio, and processing the initial range determination to determine whether to make a refined range determination utilizing signal measurements from both a base radio first antenna and a base radio second antenna.