Digital Radio Receiver Gain Control for Dynamic Word Length
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Solution Overview
Problem
In highly digitized radio receivers, existing gain control methods require large word lengths and high power consumption due to the presence of interfering signals, even after analog-to-digital conversion, which complicates signal processing and increases power usage.
Innovation Solution
A digital gain control scheme that adjusts the position of data words in a register to control signal amplitude, allowing for dynamic reduction in word length and power consumption, accompanied by a compensation stage to predict and correct distortion caused by these changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If digital processing is performed early in the receiver chain with high oversampling, then signal conversion accuracy is improved, but word length requirements increase and power consumption rises
Solution Approach 1:
The patent implements dynamic gain control that adjusts the position of data words in registers based on signal conditions. This dynamic adjustment allows the system to optimize word length and power consumption in real-time while maintaining conversion accuracy when needed
Solution Approach 2:
The invention changes the parameter of word length dynamically by controlling data word positions in registers. By adjusting gain through position control rather than maintaining fixed large word lengths, the system reduces power consumption while preserving signal fidelity when required
2Reliability
If large word length is used to accommodate signal with interferers, then signal fidelity is maintained, but processing complexity and power consumption increase
Solution Approach 1:
The patent segments the gain control function into multiple gain control stages, each handling specific portions of the signal processing. This segmentation allows complex gain control to be distributed across simpler stages, reducing overall processing complexity while maintaining signal fidelity
Solution Approach 2:
The system dynamically adjusts word length and gain control parameters based on signal conditions rather than using fixed large word lengths. This dynamic adaptation reduces processing complexity when full precision is not required while maintaining fidelity when interferers are present
3Reliability
If fixed large word length is used throughout the receiver chain, then all signal conditions are accommodated, but average power consumption increases
Solution Approach 1:
The patent implements dynamic word length adjustment through gain control stages that modify data word positions in registers. This allows the system to use smaller word lengths when signal conditions permit, reducing power consumption dynamically while maintaining the capability to accommodate all signal conditions when needed
Solution Approach 2:
The invention changes word length parameters dynamically based on signal conditions rather than using fixed large word lengths throughout. By adjusting the position of data words in registers, the system optimizes the balance between signal accommodation capability and power consumption
Data Source
AI summary
A radio receiver (100) comprises an analogue to digital converter (30) for generating a data word representative of a received radio signal and a gain control stage (40) comprising a first register (42) for storing the data word. The gain control stage (40) is adapted to control the numerical value of the data word by controlling the position of the data word in the first register (42).