Receiver Filter Out-of-Band Response Adjustment for Signal Synchronization
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Solution Overview
Problem
Wireless receivers face challenges in synchronizing to desired signals due to interference from adjacent or nearby transmitters, which can lead to false synchronization and degraded signal quality, as existing low pass filters are inadequate in suppressing out-of-band interference and introduce inter-symbol interference.
Innovation Solution
The method involves obtaining synchronization information of interfering signals to adjust the out-of-band response of receiver filters, ensuring greater dispersion of interfering signals than desired signals during synchronization periods, and using adjustable or selective filters to align frequency responses and increase group delay, thereby reducing the likelihood of false synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If low pass filters are used to filter out band interference, then out-of-band interference is reduced, but inter-symbol interference increases and signal quality degrades
Solution Approach 1:
The patent applies dynamics by making the filter characteristics adjustable rather than fixed. The receiver dynamically adjusts filter parameters based on detected interference levels and signal conditions, transitioning between different filter states to optimize performance. This resolves the contradiction by allowing the system to adapt filter behavior to current operational requirements.
Solution Approach 2:
The patent changes filter parameters such as cutoff frequency, ripple characteristics, and group delay based on detected interference conditions. By varying these parameters dynamically, the system can suppress out-of-band interference when needed while maintaining signal quality during normal operation, thus resolving the trade-off between interference rejection and signal integrity.
2Adaptability or versatility
If traditional fixed filters are used, then device complexity is low, but adaptability to varying interference conditions is insufficient
Solution Approach 1:
The receiver performs self-adjustment by automatically detecting interference characteristics and autonomously modifying filter parameters without external intervention. The system monitors signal quality and interference levels, then self-tunes the filter response accordingly, reducing the need for complex manual control while enhancing adaptability.
Solution Approach 2:
The patent implements feedback mechanisms where the receiver continuously monitors signal conditions and uses this information to adjust filter characteristics. This closed-loop control enables the system to adapt to varying interference conditions while keeping complexity manageable through automated decision-making based on real-time performance metrics.
Data Source
AI summary
Apparatuses, methods and systems of synchronizing a receiver to a desired signal are disclosed. One method includes obtaining synchronization information of an interfering signal, and adjusting an out-of-band response of a receiver filter based at least in part on the synchronization information of the interfering signal, wherein the in-band response of the receiver filter is determined by frequency components of the desired signal.