Adaptive Equalizer with Noise Analyzer for Time-Varying Interference
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Solution Overview
Problem
Conventional adaptive equalizers fail to adequately compensate for interference and distortion in communication signals due to time-varying noise and interference conditions, as they rely on time-averaging schemes that are inadequate for determining current correlations.
Innovation Solution
An adaptive equalizer system that includes a noise analyzer and a coefficient generator, which characterizes time-varying noise and interference conditions and updates equalization coefficients using a least-squares algorithm to effectively compensate for these conditions, employing multiple coefficient banks and adjustment mechanisms to adapt to changing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional adaptive equalizer uses time-averaging to determine correlation between interference and transmitted signal, then the equalizer can operate with simple computation, but it fails to accurately track time-varying noise and interference conditions
Solution Approach 1:
The patent implements dynamic adaptation by maintaining multiple coefficient banks (first coefficient bank for absence of time-varying conditions, second coefficient bank for presence of time-varying conditions) and dynamically selecting between them based on detected interference conditions. This allows the equalizer to adapt its characteristics in real-time without requiring complex continuous computation, resolving the contradiction between measurement precision and device complexity
Solution Approach 2:
The patent changes the equalization coefficients as parameters based on the detected presence or absence of time-varying noise conditions. By switching between different coefficient sets stored in different banks, the system achieves accurate tracking of time-varying conditions while avoiding the computational complexity of continuously recalculating coefficients
2Reliability
If the adaptive equalizer uses least-squares algorithm to update coefficients, then it can compensate for interference and distortion, but it requires significant computational resources and time
Solution Approach 1:
The patent performs preliminary computation by pre-calculating and storing multiple sets of equalization coefficients in separate coefficient banks for different interference conditions. This allows the system to quickly select pre-computed coefficients rather than performing computationally intensive least-squares calculations in real-time, thereby maintaining reliable interference compensation while improving coefficient update speed
Solution Approach 2:
The patent creates multiple copies of coefficient sets (first coefficient bank and second coefficient bank) corresponding to different interference conditions. By maintaining these copies and selecting the appropriate one based on detected conditions, the system achieves reliable compensation without the computational burden of real-time coefficient calculation
3Adaptability or versatility
If the equalizer uses multiple coefficient banks to handle different noise conditions, then it can adapt to time-varying interference, but it increases the complexity of the equalizer structure
Solution Approach 1:
The patent employs a noise detector that provides feedback about the presence or absence of time-varying noise conditions to the coefficient selector. This feedback mechanism enables automatic selection of the appropriate coefficient bank without complex manual configuration or management, achieving high adaptability to time-varying conditions while keeping the control logic relatively simple
Data Source
AI summary
A method and apparatus is disclosed to compensate for interference and/or distortion impressed onto a transmitted communication signal in the presence of one or more time-varying noise and/or interference conditions. A communications receiver includes a noise analyzer to characterize the composition of the interference and/or the distortion and produce a selection signal indicating the composition of the interference and/or the distortion. The communications receiver selects at least one set of equalization coefficients and/or updates at least one parameter of a least-squares algorithm or the suitable equivalent algorithm to compensate for the interference and/or the distortion impressed onto a transmitted communication signal in the presence of a particular time-varying noise and/or interference condition.