Composite Zero-Forcing Equalizer for Spectrum Flatness
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Solution Overview
Problem
Existing methods for determining the magnitude of a composite zero-forcing equalizer in wireless communications networks with multiple antenna connectors fail to meet spectrum flatness requirements when using transmit diversity, leading to inconsistent performance across different frequency pairs.
Innovation Solution
Determine the magnitude of a composite zero-forcing equalizer as the square root of a weighted combination of the squares of the magnitudes of individual zero-forcing equalizers for each antenna connector, with weights proportional to the power measured at each connector, ensuring consistent spectrum flatness across all antenna connectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual zero-forcing equalizers are determined for each antenna connector, then the equalization performance for each antenna is improved, but the spectrum flatness requirement across multiple antenna connectors is not met
Solution Approach 1:
The patent combines multiple individual zero-forcing equalizers into a single composite zero-forcing equalizer by merging the equalization results from multiple antenna connectors. The composite equalizer is determined by combining the individual equalizers with weights proportional to the power measured at each antenna connector, ensuring both equalization performance and spectrum flatness are achieved simultaneously across the transmit diversity system.
2Reliability
If transmit diversity is used with multiple antenna connectors, then the reliability of wireless communication is improved, but the spectrum flatness requirement is not met
Solution Approach 1:
The patent applies local quality by determining individual zero-forcing equalizers for each antenna connector based on its specific frequency response characteristics, then combines them with power-proportional weights. This allows each antenna to be optimized for its local conditions while the weighted combination ensures overall spectrum flatness across the transmit diversity system, maintaining both reliability and spectral compliance.
3Device complexity
If a composite zero-forcing equalizer is determined without proper weighting, then the calculation complexity is reduced, but the spectrum flatness and EVM equalizer specifications are not met
Solution Approach 1:
The patent introduces power measurements as weighting parameters to combine individual zero-forcing equalizers. By using the measured power at each antenna connector as a weight, the composite equalizer automatically adapts to the actual transmission conditions, ensuring spectrum flatness and EVM compliance without requiring complex iterative optimization algorithms, thus maintaining reasonable calculation complexity while achieving precise spectral control.
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for determining a magnitude of a composite zero-forcing equalizer. One method includes measuring a first frequency response at a first antenna connector. The method includes determining a first zero-forcing equalizer for the first antenna connector as an inverse of the first frequency response. The method includes measuring a second frequency response at a second antenna connector. The method includes determining a second zero-forcing equalizer for the second antenna connector as an inverse of the second frequency response. The method includes determining a magnitude of a composite zero-forcing equalizer as a square root of a weighted combination of squares of magnitudes of the first zero-forcing equalizer and the second zero-forcing equalizer. A first weight applied for the first antenna connector is a square of a first power measured at the first antenna connector.