Transceiver Front-End Distortion Cancellation for Lower BER
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Solution Overview
Problem
As signal throughput increases in communication systems, distortion becomes a significant limit to performance, leading to increased bit-error-rate (BER) and limiting the approach to Shannon channel limits.
Innovation Solution
The implementation of transceiver circuitry with distortion correction circuitry that determines and applies a distortion cancellation function, such as digital inversion or polynomial representation, to cancel distortion components from conditioned signals in both analog and digital front ends.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If signal throughput is increased to meet bandwidth demand, then data transmission capacity is improved, but distortion increases leading to higher bit-error-rate
Solution Approach 1:
The patent measures the actual distortion introduced by the front-end circuitry and uses this measured distortion characteristic to create a cancellation function. By converting the harmful distortion into a measurable parameter and then applying its inverse, the system eliminates the negative effect while maintaining high signal throughput, thus improving reliability without sacrificing productivity
Solution Approach 2:
The system implements a feedback mechanism where the distortion introduced by the front-end is measured and fed back to generate a cancellation function. This closed-loop approach continuously compensates for distortion effects, allowing the system to maintain high throughput while keeping bit-error-rate low through active distortion cancellation
2Reliability
If distortion correction circuitry is added to cancel distortion components, then signal quality is improved, but device complexity increases
Solution Approach 1:
The patent introduces a distortion cancellation function as an intermediary element that mediates between the distorted front-end output and the signal processing chain. This function acts as a compensating mechanism that can be implemented through lookup tables or mathematical operations, adding minimal complexity while significantly improving signal quality by canceling distortion effects
Solution Approach 2:
The system creates a model or copy of the distortion characteristic introduced by the front-end circuitry. By measuring the actual distortion and creating a representative model (cancellation function), the system can replicate and apply the inverse distortion to cancel the original effect, achieving high signal quality without requiring complex real-time correction circuitry
Data Source
AI summary
Transceiver circuitry in an integrated circuit device includes a receive path including an analog front end for receiving analog signals from an analog transmission path and conditioning the analog signals, and an analog-to-digital converter configured to convert the conditioned analog signals into received digital signals for delivery to functional circuitry, and a transmit path including a digital front end configured to accept digital signals from the functional circuitry and to condition the accepted digital signals, and a digital-to-analog converter configured to convert the conditioned digital signals into analog signals for transmission onto the analog transmission path. At least one of the analog front end and the digital front end introduces distortion and outputs a distorted conditioned signal. The transceiver circuitry further includes distortion correction circuitry at the one of the analog front end and the digital front end, to determine and apply a distortion cancellation function to the distorted signal.