Receiver Front-End Power Reduction via Adaptive Linearity
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Solution Overview
Problem
Wireless communication devices face high power consumption due to stringent linearity and noise figure requirements in receiver front-end circuits, especially in LTE FDD mode, leading to battery life issues and inefficient power usage.
Innovation Solution
Implementing power mode switching in receiver front-end circuitry based on sensitivity and linearity levels, adjusting current consumption dynamically according to operating conditions, such as decoding physical control channels, signal-to-interference-plus-noise ratio, and application types, to optimize power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the receiver front-end is designed to optimize linearity for high signal levels, then linearity performance is improved, but power consumption increases
Solution Approach 1:
The receiver front-end dynamically switches between high-linearity mode and low-linearity mode based on the detected signal level. When a high signal level is detected, the system activates high-linearity processing; when a low signal level is detected, it switches to low-linearity mode to reduce power consumption. This dynamic adaptation resolves the contradiction by making linearity performance conditional rather than constant.
Solution Approach 2:
The system changes the operating parameters of the receiver front-end based on signal conditions. Specifically, it adjusts the linearity parameter by switching between different operational modes (high-linearity and low-linearity modes) depending on the input signal level, thereby optimizing the trade-off between linearity performance and power consumption.
2Measurement precision
If the receiver front-end is designed to optimize noise figure for sensitivity levels, then sensitivity performance is improved, but power consumption increases
Solution Approach 1:
The receiver front-end dynamically adjusts its operational mode based on the detected signal level. When a low signal level is detected, the system activates high-sensitivity (low noise figure) mode; when a high signal level is detected, it switches to low-sensitivity mode to reduce power consumption. This dynamic adaptation resolves the contradiction by making sensitivity performance conditional rather than constant.
Solution Approach 2:
The system changes the noise figure parameter of the receiver front-end based on signal conditions. It adjusts the sensitivity parameter by switching between different operational modes (high-sensitivity and low-sensitivity modes) depending on the input signal level, thereby optimizing the trade-off between sensitivity performance and power consumption.
3Reliability
If the receiver is designed to handle worst-case scenarios with simultaneous noise figure and linearity requirements, then reliability is improved, but power consumption increases
Solution Approach 1:
The receiver dynamically adapts its operational characteristics based on the actual signal conditions rather than being permanently configured for worst-case scenarios. By detecting the current signal level and switching between high-linearity/low-linearity modes and high-sensitivity/low-sensitivity modes, the system maintains reliability when needed while consuming less power during normal operating conditions.
Solution Approach 2:
The system changes its operational parameters (linearity and sensitivity settings) based on detected signal levels. Instead of maintaining fixed worst-case optimization, it dynamically adjusts parameters to match actual conditions, thereby reducing power consumption while maintaining reliability when required by the signal environment.
Data Source
AI summary
A wireless communication device may operate in different power modes based at least on a decoding of a Physical Data Control Channel (PDCCH). The wireless communication device may operate its receiver front end circuitry (RX AFE) in any one of a number of different power modes, and may switch to operating the RX AFE in a different power mode based at least on decoding of the PDCCH. The transmit leakage does not need to be monitored, and the wireless communication device may adjust/adapt the sensitivity and linearity of its RX AFE based on PDCCH decoding and in some cases based additionally on one or more metrics, to reduce power consumption. The different power modes may correspond to different respective combinations of sensitivity level and linearity level at which the RX AFE is operating.