Adaptive Delta-Sigma Modulator Control for ACPR Improvement
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Solution Overview
Problem
The Δ-Σ modulator's signal and noise transfer functions are fixed, making it difficult to adapt to various transmission signals and changes in modulation methods or transmission power, resulting in suboptimal ACPR and radio characteristics.
Innovation Solution
A Δ-Σ modulator with a control mechanism that adjusts parameters such as multiplication coefficients and quantizer threshold values based on predetermined conditions, allowing it to adapt to different transmission signals and scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the Δ-Σ modulator uses fixed parameters (multiplication coefficients and quantizer threshold values), then the device complexity is reduced and ease of manufacture is improved, but the adaptability to various transmission signals and modulation methods deteriorates
Solution Approach 1:
The patent implements dynamic parameter adjustment by introducing a control mechanism that modifies multiplication coefficients and quantizer threshold values based on transmission conditions. The Δ-Σ modulator transitions from a static fixed-parameter design to a dynamic adaptive design where parameters are adjusted in real-time to match modulation methods and transmission power levels, thereby improving adaptability without requiring complete redesign of the modulator architecture.
Solution Approach 2:
The patent directly applies parameter changes by modifying the multiplication coefficients and quantizer threshold values of the Δ-Σ modulator based on detected transmission conditions. When transmission power or modulation method changes, the control mechanism adjusts these parameters to optimize ACPR performance. This approach enables the system to adapt to various transmission signals by changing operational parameters rather than structural configuration.
2Reliability
If the Δ-Σ modulator uses fixed parameters, then the ease of operation is improved, but the radio characteristics and ACPR performance deteriorate under varying transmission conditions
Solution Approach 1:
The patent implements a feedback mechanism where the Δ-Σ modulator's performance is continuously monitored and parameter adjustments are made based on transmission conditions. The control mechanism receives information about modulation methods and transmission power levels, then adjusts multiplication coefficients and quantizer threshold values accordingly to maintain optimal ACPR performance. This closed-loop approach ensures reliable radio characteristics under varying conditions while automating the parameter adjustment process.
3Reliability
If the multiplication coefficients are fixed at ±1, then the device complexity is reduced, but the ability to optimize ACPR under different transmission conditions deteriorates
Solution Approach 1:
The patent extends parameter changes to multiplication coefficients by allowing them to vary beyond the fixed ±1 values. The control mechanism adjusts these coefficients based on transmission conditions, enabling optimization of ACPR performance for different modulation methods and power levels. This approach maintains the simplicity of the basic modulator structure while adding flexibility through dynamic coefficient adjustment.
Data Source
AI summary
In order to improve radio characteristic in a transmitter, there are included a ΔΣ modulation means that ΔΣ modulates a given input signal; and a control means that changes parameters of the ΔΣ modulation means in accordance with a given condition.