Adjustable Channel Filter Centre Frequency for Irregular Bandwidth
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Solution Overview
Problem
User equipment struggles to efficiently utilize licensed spectrum with irregular bandwidth channels without increasing noise from adjacent channels, as conventional filters are not adapted to these channels, leading to inadequate adjacent channel selectivity.
Innovation Solution
An apparatus and method that adjust the effective centre frequency of channel filters to optimize adjacent channel selectivity by determining the preferred centre frequency based on signal-to-interference and noise ratio, allowing the filter to pass desired signals while attenuating unwanted adjacent channel interference, using a wider bandpass or lowpass filter configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the user equipment uses the next wider bandpass filter to receive irregular bandwidth channels, then the whole channel is received, but signals from neighbouring channels which appear as noise will be received
Solution Approach 1:
The patent applies dynamics by making the filter centre frequency adjustable rather than fixed. The system dynamically determines the optimal centre frequency for each irregular bandwidth channel by evaluating adjacent channel selectivity, allowing the filter to adapt its characteristics to minimize adjacent channel noise while maintaining the required bandwidth coverage.
Solution Approach 2:
The patent changes the parameter of centre frequency to resolve the contradiction. By varying the centre frequency parameter across different possible values and selecting the one that provides highest adjacent channel selectivity, the system achieves both adequate bandwidth coverage and minimal adjacent channel interference.
2Device complexity
If conventional channel filters are used for irregular bandwidth channels, then the filter configuration remains simple, but adjacent channel selectivity is inadequate
Solution Approach 1:
The system performs self-service by automatically determining the optimal centre frequency for each irregular bandwidth channel without requiring complex manual configuration or network signaling. The user equipment independently evaluates adjacent channel selectivity at different centre frequencies and selects the optimal setting, simplifying the overall system while improving performance.
Data Source
AI summary
A user equipment, method and computer program for adjusting an effective centre frequency of channel filter in a user equipment to improve the adjacent selectivity when the network is transmitting on an irregular bandwidth channel and the user equipment is receiving the signal via a channel filter that has a wider pass band than the bandwidth of the channel. The method comprises filtering received wireless communication signals at a channel filter. Identifying a preferred centre frequency for the channel filter by: adjusting a centre frequency of the channel filter; determining a level of adjacent channel selectivity of signals filtered by the channel filter; comparing a level of adjacent channel selectivity at different centre frequencies of the channel filter; and identifying the preferred centre frequency as the centre frequency that provides a highest level of adjacent channel selectivity.