TDD Wireless Device Impedance Switching for Energy Reduction
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Solution Overview
Problem
Conventional wireless communication devices using time-division duplex (TDD) schemes are energy-consuming due to permanently powered electronic components, especially when operating over short ranges, leading to high energy costs and inefficient energy use.
Innovation Solution
A device with a controlling module that alternates between two impedance modes to enable ambient backscatter communication, reducing the need for traditional emission and reception chain usage by varying impedance presented to the antenna, thereby minimizing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electronic components (power amplifier, low-noise amplifier, converters, oscillators) are permanently powered to enable conventional TDD wireless communication, then communication reliability and coverage range are improved, but energy consumption increases significantly
Solution Approach 1:
The patent implements periodic switching of electronic components between active and inactive states based on TDD time slots. During uplink transmission slots, the access point switches off downlink components (power amplifier, low-noise amplifier, ADC, DAC, oscillators), and during downlink slots, it switches off uplink components. This periodic action maintains communication reliability when needed while dramatically reducing overall energy consumption.
2Use of energy by moving object
If switching means are added to selectively power electronic components during emission or reception, then energy consumption is reduced, but device complexity increases
Solution Approach 1:
The patent employs a universal switching mechanism that controls multiple electronic components (power amplifier, low-noise amplifier, ADC, DAC, oscillators) simultaneously through a single control logic based on TDD timing. This multi-functional switching approach reduces the need for separate control circuits for each component, thereby limiting the increase in device complexity while achieving significant energy savings.
3Length of stationary object
If conventional TDD architecture with permanent power supply is used, then long-range communication capability is maintained, but operating costs increase due to frequent battery recharging
Solution Approach 1:
The patent implements periodic switching of electronic components between active and inactive states based on TDD time slots. During uplink transmission slots, the access point switches off downlink components (power amplifier, low-noise amplifier, ADC, DAC, oscillators), and during downlink slots, it switches off uplink components. This periodic action maintains communication reliability when needed while dramatically reducing overall energy consumption.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly reduces energy consumption of wireless communication devices by leveraging ambient backscatter technology, optimizing energy use, especially in scenarios where communication range is short, and enhancing energy efficiency in IoT applications.
Implementation Method 1
selectively varying its backscatter of an ambient signal
Data Source
AI summary
A control device for controlling the operation of a wireless communication device is described. The wireless communication device includes an antenna, a front-end module configured for transmitting and receiving signals according to a time-division multiplexing scheme, and switching means which can switch the front-end module between first and second modes in which the front-end module presents different impedances to the antenna The control device can be integrated in the communication device and includes a control module to control the switching means so that the front-end module alternates between the first and second modes so that the communication device backscatters an ambient signal.