Time-Reversed Channel Response for Coherent Signal Combining
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Solution Overview
Problem
Existing wireless communication systems face limitations in range performance due to restricted transmit power, which can lead to signal attenuation and detection by hostile parties, especially in military contexts, and increased energy consumption, necessitating techniques to enhance signal strength and range without increasing individual device power.
Innovation Solution
The implementation of a time-domain generated channel response, reversed in time, is applied to signals transmitted from a group of transmitters, allowing coherent combination at receivers, thereby increasing signal power and reducing the need for higher transmit power from individual devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If transmit power is increased to improve range performance, then communication range is extended, but energy consumption increases and signal detection by hostile parties becomes more likely
Solution Approach 1:
The patent combines signals from multiple transmitting communication devices at the receiving end to achieve coherent signal combining. By merging the signals from multiple devices, the system achieves extended communication range without requiring each individual device to transmit at high power, thus reducing overall energy consumption while maintaining range performance.
Solution Approach 2:
The patent introduces a receiving communication device as an intermediary that performs signal combining and processing. The receiving device acts as a mediator that collects signals from multiple transmitters, combines them coherently, and processes the combined signal, enabling extended range without increased transmit power from individual devices.
2Length of stationary object
If transmit power is increased to improve range performance, then communication range is extended, but the likelihood of signal interception by hostile parties increases
Solution Approach 1:
The patent merges signals from multiple transmitting devices at the receiver, allowing the system to achieve extended range through signal combining rather than high transmit power. This reduces the detectability of individual transmitters while maintaining communication range, thereby reducing the likelihood of signal interception by hostile parties.
Solution Approach 2:
The patent transitions from a single-transmitter model to a multi-transmitter spatial arrangement, utilizing spatial diversity to achieve the same communication range through geometric distribution of transmitters rather than increased power, making the signal less detectable by hostile parties.
3Use of energy by moving object
If transmit power is limited to reduce energy consumption and minimize RF emissions, then energy efficiency improves, but range performance deteriorates
Solution Approach 1:
The patent combines signals from multiple low-power transmitting devices at the receiving end to achieve the range performance of a single high-power transmitter. By merging the energy contributions from multiple devices, the system achieves extended range while maintaining low individual transmit power levels, thus improving energy efficiency.
Solution Approach 2:
The patent uses multiple copies of the same information signal transmitted by different devices at low power. These copies are then combined at the receiver to achieve the desired signal strength and range performance, allowing energy-efficient operation without sacrificing range.
4Object-affected harmful factors
If transmit power is limited to minimize RF emissions in military contexts, then operational security improves, but communication reliability deteriorates
Solution Approach 1:
The patent combines signals from multiple transmitting devices at the receiver to achieve coherent signal combining. This allows the system to maintain communication reliability at low transmit power levels by aggregating the signal energy from multiple sources, thereby ensuring reliable communication without compromising operational security.
Solution Approach 2:
The receiving communication device serves as an intermediary that enhances signal strength through coherent combining. This intermediary function allows low-power transmitters to achieve reliable communication by having the receiver actively process and combine the weak signals, maintaining both security and reliability.
Data Source
AI summary
Enhanced reception in a communication system is achieved by applying a time domain generated time-reversed channel response to signals transmitted from a group of transmitter to a group of receivers. The time-reversed channel response is generated from a radio frequency channel response derived from signals previously received from the group of receivers, but reversed in the time domain. The time-reversed channel response is convolved with an information signal that when transmitted in a coordinated fashion from the group of transmitters, the signals arrive at each receiver in the group of distant receiving communication devices at approximately the same time where the signals coherently combine, thereby increasing signal power at the receivers. This permits detection at a greater range or with a lower bit error rate. In addition, the many-to-many configuration enables signal power from each transmitter to be focused temporarily and spatially on each receiver.