Scaling Factor Determination via Normalized Noise Variance
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Solution Overview
Problem
Existing communication systems face challenges in determining an accurate scaling factor for pilot interference cancellation, leading to increased implementation complexity and estimation errors due to the need for Signal-to-Noise Ratio (SNR) estimation, which complicates the cancellation process and affects system capacity.
Innovation Solution
A method and apparatus that calculate an average power for both input and output signals of a channel predictor, determine noise variance, normalize it, and use the normalized noise variance to determine a scaling factor, eliminating the need for SNR estimation and simplifying the scaling factor calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If SNR estimation is used to determine the scaling factor, then the accuracy of pilot interference cancellation can be improved, but the implementation complexity and device complexity increase significantly
Solution Approach 1:
The patent extracts and eliminates the SNR estimation step from the scaling factor determination process. Instead of using complex SNR estimation, the invention directly uses the output of the channel predictor to calculate the scaling factor, thereby removing the source of implementation complexity while maintaining acceptable accuracy through the alternative calculation method using average power and noise variance
Solution Approach 2:
The patent replaces the complex and computationally expensive SNR estimation process with a simpler, more efficient calculation method that uses readily available data (channel predictor output). This substitution uses 'cheaper' computational resources and simplifies the overall system implementation without requiring sophisticated estimation algorithms
2Measurement precision
If SNR estimation is performed for scaling factor calculation, then cancellation accuracy may be improved, but the number of processing steps and time consumption increase
Solution Approach 1:
The patent performs preliminary calculation by using the channel predictor output directly in the scaling factor determination. By preparing and utilizing the channel predictor results that are already available in the system, the invention eliminates the need for separate SNR estimation steps, thereby reducing processing time while maintaining the ability to achieve accurate cancellation through the alternative calculation approach
3Device complexity
If conventional scaling factor determination methods are used, then implementation is straightforward, but residual interference increases and system capacity is reduced
Solution Approach 1:
The patent changes the parameters used in scaling factor determination from SNR-based metrics to average power and noise variance calculations. This parameter change allows the system to maintain implementation simplicity while achieving better cancellation performance and reducing residual interference through the alternative mathematical approach
Data Source
AI summary
A method for determining a scaling factor in a communication system. The method includes calculating an average power for each of an input signal and an output signal of a channel predictor; calculating a noise variance using the calculated average power; normalizing the noise variance with an average power of the channel predictor's output signal; and determining a scaling factor using the normalized noise variance.