Time-Reversal Wireless System for Interference Reduction
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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 in densely populated areas, as existing solutions like OFDM-based access points and MIMO techniques suffer from interference, scalability issues, and high energy consumption, failing to fully utilize the available spectrum and meet future network demands.
Innovation Solution
A time-reversal system that uses channel state information to generate location-specific signatures and downlink signals, optimizing data transmission by up-sampling and gain-adjusting signals to focus energy on individual transceivers, and employing a processor to maximize data rates while minimizing interference and energy consumption.
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 adjacent APs increases
Solution Approach 1:
The patent segments the wireless spectrum into multiple orthogonal channels and assigns different channels to adjacent APs, allowing simultaneous operation without interference. This frequency division enables high-speed data transfer for each user while preventing mutual interference between neighboring access points.
Solution Approach 2:
The patent introduces a centralized controller as an intermediary that coordinates channel allocation and signal transmission between multiple APs. The controller manages spectrum resources and ensures that adjacent APs operate on non-interfering channels, resolving the interference problem while maintaining high data transfer speeds.
2Productivity
If more access points are installed to serve densely populated areas, then network capacity is improved, but system complexity increases
Solution Approach 1:
The patent merges multiple distributed access points into a coordinated system managed by a centralized controller. The controller aggregates channel state information from all APs and unifiedy manages spectrum resources, treating the distributed network as a single coordinated entity. This reduces individual AP complexity while maintaining high network capacity in densely populated areas.
Solution Approach 2:
The centralized controller serves multiple functions: it collects channel state information from all APs, performs channel planning, allocates spectrum resources, and coordinates transmissions. This multi-functional approach consolidates complexity into a single device rather than requiring each AP to independently manage its own operations, thereby increasing network capacity without proportionally increasing overall system complexity.
3Object-generated harmful factors
If channel planning is performed manually to avoid interference, then interference is reduced, but implementation time increases
Solution Approach 1:
The patent implements self-service channel planning where the system automatically collects channel state information from all APs, analyzes interference conditions, and independently determines optimal channel assignments. The centralized controller performs channel planning autonomously without manual intervention, reducing implementation time while maintaining effective interference avoidance through automated spectrum resource allocation.
4Adaptability or versatility
If existing wireless technologies are used in dense networks, then compatibility is maintained, but spectral efficiency decreases
Solution Approach 1:
The patent introduces dynamic channel allocation where the centralized controller continuously monitors channel state information and adapts spectrum assignments in real-time based on actual network conditions. This dynamic approach allows the system to optimize spectral efficiency by assigning channels according to current traffic patterns and interference conditions, while maintaining compatibility with existing wireless standards through flexible resource management.
Data Source
AI summary
A time-reversal wireless system comprising a first wireless transceiver of a time-reversal client, one or more second wireless transceiver and/or a time-reversal client with the first wireless transceiver. The first wireless transceiver of the time-reversal client is wirelessly coupled to the one or more second wireless transceiver through a wireless broadband multipath channel associated with a space. The time-reversal client contains the first wireless transceiver. The time-reversal client also contains a processor and a memory configured to obtain a set of channel state information (CSI) in a channel probing phase, and/or to obtain a set of location-specific signatures based on the set of CSI and/or a time reversal operation in a channel probing phase. The set of CSI is captured when one or more probing signal is sent either from the first wireless transceiver to each of the at least one second wireless transceiver, or from each of the at least one second wireless transceiver to the first wireless transceiver, through the wireless broadband multipath channel associated with the space. A channel passband with bandwidth W0 is associated with the wireless broadband multipath channel. A first passband with bandwidth W1 is associated with the first wireless transceiver. The W1 is not larger than W0 such that the first passband is part of the channel passband. One or more second passband is associated with the one or more second wireless transceiver such that a bandwidth W2 associated with each of the one or more second passband is not larger than W1 such that the each of the one or more second passband is part of the first passband. Each of the set of CSI include a channel impulse response, a channel frequency response, and/or another channel state data of the wireless broadband multipath channel.