Individualized Gain Control for Remote Uplink Band Paths in DAS
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Solution Overview
Problem
In distributed antenna systems (DASs), maintaining optimal gain levels for remote uplink band paths is challenging due to varying power levels of combined uplink communications signals, which can lead to reduced sensitivity and non-linear signal conversion issues, particularly in optical fiber-based systems where power thresholds must be managed to prevent overloading.
Innovation Solution
Implementing individualized gain control for remote uplink band paths based on their specific power contributions to the combined uplink power, using measurement circuits and controllers to adjust gains dynamically, thereby allowing higher initial gains for paths with lower power contributions without compromising sensitivity across all paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If uniform gain is applied to all remote uplink band paths to maintain system stability, then overload protection is achieved, but sensitivity of individual low-power paths is reduced
Solution Approach 1:
The patent segments the uplink band paths into individual channels, each with independent gain control. Instead of applying uniform gain to all paths, the system measures power contribution of each path and applies differential gain adjustments, allowing low-power paths to receive higher gain while high-power paths receive lower gain, thus resolving the contradiction between overload protection and sensitivity
Solution Approach 2:
The patent implements local quality by making gain control path-specific rather than uniform across all paths. Each uplink band path receives customized gain based on its individual power contribution to the combined signal, ensuring that low-power paths maintain high sensitivity while high-power paths are prevented from causing overload
2Measurement precision
If higher initial gains are set for remote uplink band paths to improve sensitivity, then weak signal reception is enhanced, but high power signals may exceed threshold levels causing non-linear conversion
Solution Approach 1:
The patent applies dynamics by making gain control adaptive rather than static. The system continuously measures the power contribution of each uplink band path and dynamically adjusts gain levels in real-time, allowing high sensitivity for weak signals when needed while automatically reducing gain for high-power signals to prevent non-linear conversion in optical fiber-based DAS
Solution Approach 2:
The patent implements feedback mechanisms where power measurement circuits continuously monitor the power contribution of each uplink band path, and this information feeds back to the gain control logic, which adjusts gains accordingly. This closed-loop feedback ensures sensitivity for weak signals while preventing overload from high-power signals
Data Source
AI summary
Individualized gain control of remote uplink band paths in a remote unit in a wireless communication system based on combined uplink power level in the remote unit. The combined uplink power of a combined uplink communications signal in a remote unit is measured. If the combined uplink power level exceeds a defined uplink threshold power level for the remote unit, the gain is reduced for individual uplink band paths that provide a higher power contribution to the combined uplink power of combined uplink communications signal in the remote unit. This allows the initial uplink gain of the uplink band paths in a remote unit to be set higher to increase sensitivity, because the gain of the uplink band paths providing higher power contributions to the combined uplink power in the remote unit can be reduced, without reducing gain in other uplink band paths of the remote unit.