Time Reversal Wireless Communication for Indoor Multipath Management
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Solution Overview
Problem
Current wireless technologies for the Internet of Things face challenges in achieving high data rate and low power consumption while dealing with indoor communication, where multipath fading is prevalent, and existing solutions either lack efficiency or require complex hardware and high power consumption.
Innovation Solution
The implementation of time reversal techniques for wireless communication systems, which involve capturing and exploiting the inherent structures of multipath channels to achieve high communication capacity, low power consumption, and efficient channel state information processing, enabling applications such as indoor positioning, life detection, and event monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional wireless technologies are used for indoor communication, then device compatibility is maintained, but data rate is low and power consumption is high
Solution Approach 1:
The patent converts the harmful multipath fading effect into a beneficial resource by capturing channel state information from the multipath channels and using it to generate time-reversed signals. These signals are transmitted back through the same channels, where the previously harmful multipath effects are exploited to create focused energy delivery, achieving high data rates and low power consumption simultaneously.
2Productivity
If time reversal techniques are implemented, then communication capacity increases and power consumption decreases, but hardware complexity increases
Solution Approach 1:
The patent makes the wireless channel itself universal by using the same channel for both receiving channel state information and transmitting time-reversed signals. The channel serves multiple functions: it carries the original signal, provides multipath components for signal generation, and delivers the time-reversed signal back to the source. This eliminates the need for separate dedicated hardware components for each function.
Solution Approach 2:
The system uses the channel state information captured from the multipath channels to generate the time-reversed signals, allowing the channel to essentially serve itself. The channel's own characteristics (multipath structure) are used to create the signals that will be transmitted through it, eliminating the need for external complex signal generation hardware.
3Productivity
If channel state information is captured and processed, then communication efficiency improves, but processing time and computational complexity increase
Solution Approach 1:
The patent performs preliminary action by capturing channel state information during an initial phase before the main communication begins. The channel state information is captured and processed in advance to generate time-reversed signals, which are then transmitted efficiently without requiring continuous real-time processing during data transmission, thus reducing overall processing time.
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 allows for efficient indoor communication with high data rates, low power consumption, and effective multipath management, enabling applications like indoor positioning, life detection, and event monitoring, while reducing hardware complexity and power requirements.
Implementation Method 1
dealing with indoor communication, where multipath fading is prevalent
Implementation Method 2
The implementation of time reversal techniques for wireless communication systems, which involve capturing and exploiting the inherent structures of multipath channels
Data Source
AI summary
The present teaching relates to wireless Internet of Things. In one example, a time reversal client is disclosed. The time reversal client comprises a processor, a memory communicatively coupled with the processor, and a set of instructions, when executed by the processor based on the memory, that cause the time reversal client to perform the following steps: communicatively coupling with a time reversal server through a network, obtaining a set of channel state information (CSI), wherein the set of CSI is captured when at least one probing signal is sent from the wireless transmitter to the wireless receiver through a wireless multipath channel associated with a space, and causing the set of CSI to be sent to the time reversal server through the network.