Wireless Receiver Sampling Control for Low-Power Data Reception
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Solution Overview
Problem
Existing energy-saving receivers, such as super-regenerative and detector receivers, consume too much energy for prolonged battery operation, limiting their operational duration to around 20 days with a lithium button cell, due to high average current consumption even when switched on intermittently.
Innovation Solution
A receiver arrangement with an analog receiver, an evaluating device, and a control device that activates the receiver only during sampling pulses and deactivates it during pauses, with adaptive switching between phases of different sampling frequencies based on predefined criteria, allowing for efficient energy usage by reducing current consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the receiver is permanently switched on to maintain readiness for signal reception, then the reception reliability is improved, but the energy consumption increases significantly
Solution Approach 1:
The receiver is activated periodically through sampling pulses instead of continuous operation. The control unit generates sampling pulses that switch the receiver on only during specific sampling intervals, allowing the receiver to remain dormant between pulses. This periodic activation maintains the ability to detect signals while dramatically reducing average current consumption from 10 mA to approximately 400 μA.
2Measurement precision
If the sampling rate is increased to improve data reception accuracy, then the measurement precision is improved, but the energy consumption increases
Solution Approach 1:
The sampling frequency is made dynamically adjustable rather than fixed. The control unit can adapt the sampling rate based on operational requirements, allowing optimization between precision and energy consumption. This dynamic adjustment enables the system to use higher sampling rates only when necessary for accurate data reception, while using lower rates during periods when energy conservation is prioritized.
Data Source
AI summary
A receiver assembly for the wireless reception of data that are modulated onto a carrier signal includes an analog receiver, an evaluating device and a control device. The control device controls the receiver by means of sampling pulses such that the receiver is activated during the sampling pulses and is ready to receive transmission signals and is deactivated during the sampling pauses. The evaluating device generates a data bit sequence from the received signals that are supplied by the receiver during the sampling pulses. The control device is further designed to actuate the receiver between phases having differing sampling frequency ranges in dependence on at least one predefined switching criterion.