Jammer Suppression for Frequency Scan in Wireless Devices
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Solution Overview
Problem
Wireless communication devices face challenges in identifying and connecting to carrier frequencies in the presence of strong adjacent systems, which can mask intended frequencies due to interference, leading to substandard user experiences and acquisition failures.
Innovation Solution
The method involves identifying jammer signals during a frequency scan, suppressing them to derive a jammer-suppressed signal, and performing a second frequency scan based on this signal, allowing the device to detect and connect to intended systems even in interference-heavy environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a frequency scan is performed in the presence of strong adjacent systems, then the wireless communication device can identify carrier frequencies, but the adjacent systems can mask intended frequencies due to interference
Solution Approach 1:
The patent applies the 'Blessing in disguise' principle by detecting the harmful jammer signals during the frequency scan process and converting this harmful interference into useful information. The device identifies carrier frequencies of intended systems even when masked by adjacent systems, turning the interference problem into an opportunity to improve frequency detection accuracy through jammer-aware scanning techniques.
Solution Approach 2:
The patent uses an intermediary approach by introducing a jammer detection and suppression mechanism that acts as a mediator between the frequency scan process and the presence of adjacent systems. This intermediary component filters out harmful interference and enables reliable frequency identification despite the presence of masking signals.
2Reliability
If a full frequency scan is performed to ensure all carrier frequencies are checked, then no frequency is missed, but the process is time-consuming and inefficient
Solution Approach 1:
The patent applies the 'Preliminary action' principle by performing preliminary jammer detection and identification during the frequency scan process. By detecting and suppressing jammer signals in advance, the device can efficiently identify valid carrier frequencies without time-consuming full scans, reducing acquisition time while maintaining detection reliability.
Solution Approach 2:
The patent implements a feedback mechanism where the results of frequency scanning and jammer detection are fed back to refine subsequent scanning operations. This feedback loop enables the device to learn from previous scans and improve efficiency, reducing the time required for complete frequency detection.
3Reliability
If jammer signals are suppressed to improve frequency detection, then intended systems can be identified, but the device complexity increases
Solution Approach 1:
The patent applies the 'Self-service' principle by implementing jammer detection and suppression mechanisms that operate autonomously within the frequency scan process. The device self-identifies and self-corrects interference issues without external intervention, improving frequency detection accuracy through integrated self-service signal processing capabilities.
Data Source
AI summary
A method for performing a frequency scan in presence of an adjacent jammer signal is provided. The method can include a wireless communication device determining an occurrence of an acquisition (ACQ) failure on a candidate system in a frequency scan candidate list (FSCL) generated based on a first frequency scan; identifying the candidate system as a jammer signal in response to the ACQ failure; suppressing the jammer signal to derive a jammer suppressed signal; and performing a second frequency scan based at least in part on the jammer suppressed signal.