Dual Reception Structure for Signal Selectivity and Sensitivity
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Solution Overview
Problem
Reception structures using super-regenerative oscillation (SRO) exhibit low frequency selectivity, leading to signal deterioration due to adjacent interference, while increasing frequency selectivity is hindered by the limitations of the SRO's quality factor and the complexity of additional circuits required to improve quenching signals.
Innovation Solution
A dual reception structure is implemented, comprising a first receiver with a lower Q factor for high sensitivity and a second receiver with a higher Q factor for enhanced frequency selectivity, where a reception controller selects between them based on interference information, including packet error rate and interference signal presence, to optimize signal reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a super-regenerative oscillation (SRO) reception structure is used, then receiver sensitivity is improved at low power, but frequency selectivity deteriorates due to low Q factor
Solution Approach 1:
The reception apparatus is divided into two separate reception paths: a first reception path using SRO structure for high sensitivity and low power consumption, and a second reception path using high Q factor structure for high frequency selectivity. The system segments the reception function to handle different signal conditions independently, allowing each path to optimize for its specific strength.
Solution Approach 2:
The system dynamically switches between the first and second reception paths based on detected interference conditions. When adjacent band interference is detected, the system transitions to the second reception path; when no interference is present, it uses the first reception path. This dynamic adaptation allows the system to maintain optimal performance under varying channel conditions.
2Manufacturing precision
If frequency selectivity is increased in SRO structure, then adjacent interference is reduced, but device complexity increases due to additional circuits for improving quenching signals
Solution Approach 1:
Instead of modifying the SRO structure to improve frequency selectivity, the patent segments the reception system into two independent paths. The first path maintains the simple SRO structure for sensitivity, while the second path uses a separate high Q factor reception structure for frequency selectivity. This avoids the complexity of modifying quenching signals in SRO while achieving the desired frequency selectivity.
Solution Approach 2:
The system introduces an interference detector as an intermediary component that monitors the received signal for adjacent band interference. Based on the detector's output, a switch selectively connects the appropriate reception path. This intermediary mechanism enables intelligent selection between reception modes without requiring complex modifications to either reception structure.
3Device complexity
If a single reception structure is used, then device complexity is reduced, but adaptability to different interference conditions deteriorates
Solution Approach 1:
The reception apparatus employs dynamic switching between two reception paths based on real-time interference detection. The system adapts its reception characteristics by selecting the appropriate path: the first path for clean channels and the second path for channels with adjacent band interference. This dynamic behavior provides high adaptability without requiring a single overly complex structure.
Solution Approach 2:
The reception apparatus achieves multi-functionality by incorporating two reception paths that can handle different signal conditions. The first path handles low-power, high-sensitivity reception, while the second path handles interference-rejected reception. This universal design allows the system to perform multiple reception functions using a integrated dual-path architecture.
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 effectively increases frequency selectivity while maintaining low power characteristics and high receiver sensitivity, efficiently removing interference signals and improving signal quality by dynamically switching between the two receivers based on interference conditions.
Implementation Method 1
a first receiver having a first quality (Q) factor and configured to receive a signal in a predetermined band in response to the first receiver being selected by a reception controller
Implementation Method 2
a frequency converter configured to be operated by an oscillation signal of the super-regenerative oscillator and configured to convert the signal to an intermediate frequency (IF) band lower than a frequency of the signal
Data Source
AI summary
A reception apparatus having a dual reception structure includes a first receiver having a first quality (Q) factor and configured to receive a signal in a predetermined band in response to the first receiver being selected by a reception controller; a second receiver having a second Q factor greater than the first Q factor and configured to receive the signal in the predetermined band in response to the second receiver being selected by the reception controller; and a reception controller configured to select one of the first receiver and the second receiver based on interference information associated with an adjacent band adjacent to the predetermined band.