Gain Level Control Circuit Preventing Digital Amplitude Clipping
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Solution Overview
Problem
Wireless communications systems face digital amplitude clipping due to the limited representation of digital amplitudes by a predefined number of binary bits, leading to increased processing complexity and costs when trying to support dynamic power control in wireless distributed systems.
Innovation Solution
A gain level control circuit that dynamically adjusts the digital amplitudes of communications signals by identifying and reducing the amplitude of specific signals approaching the full-scale digital amplitude, thereby preventing clipping without increasing the number of binary bits, achieving a balance between performance, complexity, and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of binary bits is increased to represent more digital amplitudes, then the precision of digital amplitude representation is improved, but the device complexity and cost increase
Solution Approach 1:
The patent implements dynamic gain control that adjusts signal amplitudes in real-time based on current signal conditions. The system monitors digital signal amplitudes and dynamically applies gain adjustments to prevent clipping, allowing the use of fixed-bit representation while maintaining effective precision through adaptive control
Solution Approach 2:
The system changes the gain parameter of signals dynamically to prevent digital amplitude clipping. By adjusting the gain parameter rather than increasing bit depth, the system maintains adequate amplitude representation precision while avoiding the complexity and cost of wider data paths and higher-precision processors
2Reliability
If dynamic power control is implemented to prevent digital amplitude clipping, then the reliability of signal transmission is improved, but the device complexity increases
Solution Approach 1:
The system performs preliminary gain adjustments on individual signals before they are combined in the digital domain. By pre-controlling the amplitudes of component signals to ensure their sum will not exceed the full-scale range, the system prevents clipping without requiring complex real-time monitoring and adjustment of the combined signal
Solution Approach 2:
The patent applies gain control to individual segmented signals (e.g., per carrier, per code division, or per spatial stream) rather than to the entire combined signal. This segmentation allows independent amplitude control of each component signal, simplifying the control logic while ensuring the total combined amplitude remains within acceptable limits
3Measurement precision
If the full-scale digital amplitude is increased to accommodate higher aggregated amplitudes, then the measurement precision is improved, but the loss of information increases due to overflow and clipping
Solution Approach 1:
The system applies preliminary gain reduction to individual signals that would otherwise cause the aggregated amplitude to approach or exceed the full-scale digital amplitude. This preemptive action prevents overflow and clipping before they occur, eliminating information loss while maintaining adequate precision through the existing bit representation
Data Source
AI summary
A gain level control circuit in a wireless distribution system (WDS) is provided. The digital level control circuit receives a number of first digital communications signals having a number of first digital amplitudes and generates a number of second digital communications signals having a number of second digital amplitudes. When a selected second digital amplitude approaches a full-scale digital amplitude represented by a predefined number of binary bits, the gain level control circuit determines a selected first digital communications signal having a selected first digital amplitude causing the selected second digital amplitude to exceed the full-scale digital amplitude and adjusts the selected first digital amplitude to reduce the selected second digital amplitude to lower than or equal to the full-scale digital amplitude. As such, it is possible to overcome digital amplitude clipping without increasing the predefined number of binary bits, thus achieving a calculated balance between performance, complexity, and cost.