Receiver Spur Cancellation Using LMS for Multiple In-Band Spurs
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing radio receiver systems face interference and degradation due to in-band spurs caused by board/SiP layout issues, which current single spur cancellation techniques are impractical to address effectively when multiple spur frequencies are present.
Innovation Solution
A spur canceling radio frequency receiver system is implemented with a spur cancellation engine that includes an adder, multipliers, and a calibration engine, capable of canceling multiple spurs by representing them as sinusoids and using least mean squares adaptation to compute coefficients for effective spur cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If single spur cancellation techniques are used, then implementation is simple, but effectiveness deteriorates when multiple spur frequencies are present
Solution Approach 1:
The patent segments the spur cancellation process into multiple independent channels, each handling a specific frequency band. The receiver divides the received signal into multiple frequency channels, and each channel applies its own spur cancellation algorithm independently. This segmentation allows the system to handle multiple spurs simultaneously while maintaining manageable complexity in each individual channel.
Solution Approach 2:
The patent implements a universal spur cancellation framework that can handle both single and multiple spurs using the same basic algorithmic structure. The multi-channel receiver architecture provides multi-functionality by being capable of processing different types of interference (single spur, multiple spurs, varying frequencies) through a unified approach, rather than requiring separate specialized techniques for each scenario.
2Reliability
If multiple spur cancellation is implemented, then receiver performance improves, but system complexity increases
Solution Approach 1:
The system segments the complex multiple spur cancellation task into simpler sub-tasks handled by individual frequency channels. Each channel processes a specific frequency range and applies spur cancellation independently, reducing the computational burden on any single processing unit while achieving overall multiple spur cancellation across the entire bandwidth.
Solution Approach 2:
The patent transitions from attempting to cancel multiple spurs in a single frequency domain to processing them across multiple frequency dimensions (channels). By distributing the cancellation task across the frequency dimension, the system manages complexity more effectively while maintaining the ability to cancel multiple spurs simultaneously.
Data Source
AI summary
A technique to mitigate in-band spurs introduced into a signal due to various board/SiP layout issues at a receiver is disclosed. The spurs can be approximated as sinusoids at different known frequencies with unknown amplitudes and phases. The technique is applicable to both single and multiple spur cancellation.