Adaptive Filter Control in Multi-Channel Receivers
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Solution Overview
Problem
Devices processing multiple parallel signal channels face excessive power consumption due to the need for extensive filtering to prevent interference, which increases with the number of channels and filter operations.
Innovation Solution
A filter management circuit that adapts filtering operations based on detected reception conditions, enabling or disabling filtering and error correction to reduce power consumption by selectively activating or deactivating signal processing circuits, and distinguishing between indoor and outdoor conditions using signal types like GPS or WIFI signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If extensive filtering operations are applied to all channels to prevent interference, then interference suppression is improved, but power consumption increases
Solution Approach 1:
The filter management circuit dynamically adjusts the filtering operations applied to each channel based on detected reception conditions. Instead of applying static extensive filtering to all channels, the system adapts the filtering level in real-time, enabling full filtering only when interference is detected and reducing or disabling filtering when conditions are favorable, thus resolving the contradiction between interference suppression and power consumption
Solution Approach 2:
Different filtering operations are applied to different channels based on their individual reception conditions. The filter management circuit evaluates each channel separately and applies appropriate filtering levels to each, rather than uniformly applying extensive filtering to all channels. This localized approach ensures interference suppression where needed while minimizing power consumption on channels with good reception conditions
2Object-affected harmful factors
If the number of filter operations is increased to handle more channels, then channel isolation is improved, but device complexity increases
Solution Approach 1:
The filter management circuit serves multiple functions: it detects reception conditions, evaluates interference levels, selects appropriate filtering operations, and controls the application of filtering to multiple channels. This multi-functional approach consolidates what would otherwise require separate dedicated circuits for each channel, reducing overall device complexity while maintaining effective channel isolation
Solution Approach 2:
The system changes the parameters of filtering operations (such as filter order, cutoff frequencies, or enable/disable states) based on detected reception conditions and signal characteristics. By dynamically adjusting these parameters, the system achieves effective channel isolation without requiring the maximum complexity of filtering operations to be permanently in place for all channels
Data Source
AI summary
A device processes signals from a plurality of signal channels that are received in parallel. A channel processing circuit (12a,b, 14a,b), applies a series of filtering operations selectively to the signal from a first one of the signal channels. A filter management circuit (18) detects a reception condition from reception of a signal in a second one of the signal channels. The filter management circuit (18) controls application of at least a part of said filtering operations to the signal from the first one the signal channels by the channel processing circuit (12a,b, 14a,b), dependent on the detected reception condition. Selected filter operations may be enabled or disabled. Thus, power consumption may be reduced. In an embodiment, the detected reception condition is determined as a by-product of functional reception of another channel. Thus power consumption for the detection of the reception condition is also reduced. From reception of specific types of channels, for example, it may be detected whether the device is indoors or outdoors and filtering of other channels may be adapted accordingly.