Encoding Communication Data into Radar Waveforms
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Solution Overview
Problem
Existing methods for utilizing radar signals for high-throughput wireless communications face limitations due to the need for specialized radar waveforms, which restrict simultaneous operation and result in significant performance trade-offs between radar and communication performance.
Innovation Solution
A system that determines a set of optimal waveforms within a multidimensional vector space, allowing for the encoding of communication data into radar waveforms that satisfy specific radar performance constraints, enabling simultaneous radar and communication functionality without compromising performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional communications signals are used for radar, then communications throughput is improved, but radar performance deteriorates due to poor range sidelobes and Doppler tolerance
Solution Approach 1:
The patent transforms traditional communication waveforms by applying specific parameter modifications to achieve dual functionality. The communication waveforms are adjusted in terms of amplitude, phase, and temporal structure to satisfy radar performance constraints while maintaining high communication throughput, thereby resolving the contradiction between communications productivity and radar reliability.
Solution Approach 2:
The patent creates waveforms that serve dual purposes as both communication signals and radar signals. By designing universal waveforms that can simultaneously carry communication data and provide radar detection functionality with acceptable range sidelobes and Doppler tolerance, the system eliminates the need for separate specialized signals, thus resolving the performance trade-off.
2Adaptability or versatility
If time or frequency division schemes are used to share spectrum, then radar and communications can operate simultaneously, but performance of both systems deteriorates significantly
Solution Approach 1:
The patent merges radar and communication functions into a unified waveform transmission system. Instead of separating operations in time or frequency domains, the invention combines both functionalities into simultaneous operations using the same spectral resources, achieving performance levels that exceed the sum of separate operations while maintaining simultaneous functionality.
3Adaptability or versatility
If radar transmits traditional communications signals in tandem with radar waveforms, then communications functionality is added, but communications signal power must be significantly reduced to avoid interference
Solution Approach 1:
The patent creates unified dual-functional waveforms that eliminate the need for separate communication signal transmission. By making the radar waveform itself carry communication data through embedded modulation schemes, the system achieves full communications functionality at radar signal power levels, avoiding the significant power reduction required by traditional tandem transmission approaches.
4Reliability
If specialized radar waveforms are used, then radar performance is optimized, but the number of available waveforms for high throughput communications is limited
Solution Approach 1:
The patent modifies specialized radar waveforms by adjusting their parameters to create a family of waveforms that maintain radar performance characteristics while providing sufficient diversity for high-throughput communications. This parameter transformation approach generates multiple usable waveforms from specialized radar signals, resolving the contradiction between radar reliability and communications productivity.
Data Source
AI summary
A high-throughput communications channel is encoded using transmit waveforms which satisfy a variety of technical constraints deemed desirable for effective radar operations and signal processing. This enables new cooperative spectrum sharing modalities for radar and communications systems.