Time-Reversal Wireless System for Interference-Limited Dense Networks
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Solution Overview
Problem
Current wireless communication technologies face challenges in efficiently and cost-effectively supporting the increasing demand for high-speed and low-latency data transfer across a large number of closely spaced devices, due to interference issues and limited spectral allocation, especially in densely populated areas like airports and stadiums, where traditional solutions such as OFDM-based access points and MIMO techniques struggle to scale.
Innovation Solution
A time-reversal system that utilizes a first wireless transceiver coupled with one or more second wireless transceivers through a wireless multipath channel, obtaining and processing location-specific channel information to optimize data transmission by focusing signals using location-specific signatures and waveforms, thereby enhancing data rates and reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If OFDM-based access points are deployed to support high-speed data transfer, then data transfer speed is improved, but interference between closely spaced devices increases and spectral allocation becomes limited
Solution Approach 1:
The patent applies time-reversal technology where the base station records the channel response from devices to the base station and transmits the time-reversed signal back through the same channel. This inverts the conventional transmission approach to achieve signal focusing and interference cancellation, allowing high-speed data transfer without the interference problems of traditional OFDM systems
Solution Approach 2:
The system generates location-specific signatures and waveforms for each device based on its unique channel characteristics. Each device receives customized signal processing tailored to its specific spatial location and channel conditions, enabling efficient communication for each device simultaneously without mutual interference
2Productivity
If MIMO techniques are used to increase spectral efficiency, then data transfer capability is improved, but device complexity and cost increase
Solution Approach 1:
The base station performs channel sounding and signal processing autonomously by recording and time-reversing the channel response. The system self-adapts to each device's channel characteristics without requiring complex MIMO configurations at the device level, achieving high spectral efficiency while keeping device complexity low
3Quantity of substance
If more access points are installed to serve more devices, then network coverage is improved, but interference and scheduling delays increase
Solution Approach 1:
The system divides the network into device-specific communication channels using location-specific signatures. Each device gets dedicated time-reversal channels that are orthogonal to each other, allowing simultaneous communication for multiple devices without scheduling conflicts or interference, thereby eliminating scheduling delays
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 data transmission by focusing signals on individual devices, maximizing data rates and minimizing interference, thus addressing the scalability and spectral allocation challenges in densely populated areas.
Implementation Method 1
A time-reversal system that utilizes a first wireless transceiver coupled with one or more second wireless transceivers through a wireless multipath channel, obtaining and processing location-specific channel information to optimize data transmission by focusing signals using location-specific signatures and waveforms
Implementation Method 2
focusing signals using location-specific signatures and waveforms, thereby enhancing data rates and reducing interference
Data Source
AI summary
The present teaching relates to collecting and processing location-specific wireless waveforms for use in wireless communication, components, methods, apparatuses, servers, and systems. In one embodiment, a disclosed system comprises a first wireless transceiver of a first device, and at least one second wireless transceiver of at least one second device. The first wireless transceiver of the first device is wirelessly coupled to the at least one second wireless transceiver through a wireless multipath channel associated with a space. The first device with the first wireless transceiver comprises a processor and a memory, which are configured to obtain a set of channel information (CI) and perform a task associated with the space based on the set of channel information. The set of channel information is captured when at least one probing signal is either (1) sent from the first wireless transceiver to a particular second wireless transceiver through the wireless multipath channel associated with the space, or (2) sent from the particular second wireless transceiver to the first wireless transceiver through the wireless multipath channel. The set of CI comprises a channel impulse response, a channel frequency response, a channel profile, and/or another channel data of the wireless multipath channel.