Encoded Space-Time Warped Asymmetrical Signaling
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Solution Overview
Problem
Existing communication, sensing, and navigation systems face challenges in achieving directional signal strength improvement similar to that of a physical aperture antenna at all transmitting and receiving locations, while maintaining omnidirectional capabilities.
Innovation Solution
The method involves generating information symbols with finite durations and normalized entropy, and moving an antenna in a predetermined spatial pattern to modify the location of energy radiation, creating encoded space-time warped signals with directional dependence, allowing for simultaneous transmission of different signals in every direction and enabling decorrelation of signals for improved sensing, communication, and navigation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a physical aperture antenna is used to provide directivity, then signal strength is improved in the preferred direction, but signal strength is lost in non-preferred directions
Solution Approach 1:
The antenna is moved along a predetermined spatial pattern during symbol transmission, creating dynamic position changes that encode spatial information into the signal. This dynamic movement allows the system to achieve directional signal enhancement through processing rather than through a fixed physical aperture, resolving the contradiction between directivity and omnidirectional capability
Solution Approach 2:
The invention adds the time dimension to the spatial encoding by moving the antenna during symbol transmission. This creates space-time warped signals where directional information is encoded in both space and time domains, allowing omnidirectional transmission with directional processing capability
2Illumination intensity
If the antenna is moved to create space-time warped signals, then directivity improvement is achieved, but the system complexity increases
Solution Approach 1:
Instead of using a complex physical aperture structure, the invention creates a virtual aperture through antenna movement. The spatial pattern traced by the antenna during symbol transmission acts as a synthesized aperture, achieving directivity without the physical complexity of large aperture structures
Solution Approach 2:
The invention changes the operational parameters by moving the antenna along predetermined spatial patterns at controlled velocities. These parameter changes (position, velocity, trajectory) create the space-time warping effect that provides directivity, avoiding the need for complex physical structures
3Speed
If high velocity movement is used to modify energy radiation location, then space-time warping is enhanced, but the difficulty of controlling instantaneous speed increases
Solution Approach 1:
The antenna movement trajectory and velocity profile are predetermined before transmission. The spatial pattern and timing are pre-planned to achieve the desired space-time warping effect, simplifying real-time control by using pre-computed trajectories rather than requiring complex real-time velocity adjustments
Solution Approach 2:
The antenna moves along predetermined spatial patterns that can be periodic or cyclic in nature. This periodic movement creates consistent space-time warping effects that are easier to control and reproduce, simplifying the operation compared to arbitrary high-velocity movements
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 enhances directivity and reduces multipath effects in communication systems and clutter in sensing systems, while allowing for angular location determination in navigation systems, achieving ubiquitous illumination and directionality with a single omnidirectional receiver.
Implementation Method 1
moving an antenna in a predetermined spatial pattern as a function of time while transmitting the information signals. The motion modifies the location of the energy radiation along a coded path in space, resulting in apparent asymmetric time warping of the radiated energy in waves
Data Source
AI summary
Space-time coding is applied to a wave transmitter, receiver, or both. In general, the space-time coding is performed by real or synthetic motion of the transmitter or receiver, with the location of energy radiation/reception varying over the symbol duration with at least one occurrence during the symbol duration of a minimum instantaneous speed greater than a quarter of the ratio of the smallest wavelength of the waves divided by the symbol duration, and with coded acceleration of the modification of location to modify the velocity over the symbol duration.