Adaptive FIR Filter Reconfiguration for Channel Interference Cancellation
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Solution Overview
Problem
Current data transceiver designs require lengthy FIR filters to accommodate multiple operational circumstances, leading to over-design and resource inefficiency, as they often include excessive dynamic range, precision, and taps to cancel interfering signals effectively.
Innovation Solution
The method involves monitoring channel characteristics to optimize FIR filter performance by reducing dynamic range, precision, linearity, or disabling unnecessary filter taps, and reallocating resources, using direct and indirect monitoring techniques such as SNR and BER monitoring, and reconfiguring the filter to only include necessary taps for effective echo or crosstalk cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the filter length is increased to accommodate multiple operational circumstances, then the filter can handle various interference scenarios, but the resources (power, circuitry, noise margin) required increase
Solution Approach 1:
The filter length is made dynamically adjustable rather than fixed. The system monitors channel characteristics and automatically configures the filter length to match current operational needs, allowing the filter to be long when interference requires it and short when resources should be conserved
Solution Approach 2:
The filter parameters (length, coefficients) are changed based on monitored channel characteristics. The system transitions between different filter configurations depending on the operational circumstances, optimizing the balance between interference cancellation capability and resource consumption
2Adaptability or versatility
If the filter length is increased to accommodate multiple operational circumstances, then the filter can handle various interference scenarios, but the circuitry complexity increases
Solution Approach 1:
The filter structure is dynamically reconfigured by enabling or disabling specific taps based on channel conditions. This allows the system to use a long filter structure when needed but activate only the necessary components, reducing effective circuitry complexity during normal operation
Solution Approach 2:
The filter is divided into multiple taps that can be independently activated or deactivated. This segmentation allows the system to enable only the necessary filter sections for current operational needs, reducing the active circuitry while maintaining the capability to use the full filter length when required
3Adaptability or versatility
If the filter length is increased to accommodate multiple operational circumstances, then the filter can handle various interference scenarios, but the noise margin decreases
Solution Approach 1:
The filter length is dynamically adjusted to match the actual interference characteristics. By using only the necessary filter length for current conditions, the system avoids the noise accumulation that would occur with excessive filter taps, thereby maintaining an adequate noise margin
Data Source
AI summary
A method of optimizing filter performance through monitoring channel characteristics is provided. A signal enters a channel and a receiver receives the signal. The receiver includes a FIR filter to remove near-end transmitted interference and recover a far-end desired signal. The filter has storage elements configured as a shift registers to move the signal, multipliers to multiply the signal by a filter coefficient, an intermittent summer to combine the multiplied results into a replica of an interfering signal, a final summer to remove the replica from the receiver signal to provide direct and indirect monitoring of the signal, where direct monitoring includes time or frequency monitoring, and indirect monitoring includes monitoring signal to noise ratio, error magnitude or bit error rate. The filter is optimized according to monitoring and includes reducing a dynamic range, reducing bits of precision, reducing linearity, the filter, and reallocating the filter.