Multi-Carrier Phase-Modulated Waveform for Joint Radar Communication
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge in joint radar-communication systems for automotive applications is the limited degrees of freedom due to the need to estimate both communication symbols and radar parameters, which complicates waveform design and increases complexity in transmit processing, especially in the mmWave band where spectrum reuse for low latency and safety-critical communication is crucial.
Innovation Solution
A method and system utilizing a multi-carrier phase-modulated continuous waveform (MC-PMCW) that encodes information by phase modulation across multiple carrier frequencies, allowing simultaneous detection and ranging with robustness against multi-user interference, enabling efficient use of bandwidth for both radar and communication functions without the need for multiplexing, using phase-shift keying (PSK) and differential phase shift keying (DPSK) for robust information encoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If joint radar-communication waveform design is implemented to enable spectrum reuse, then spectral efficiency is improved, but the complexity of transmit processing increases due to the need to estimate both communication symbols and radar parameters simultaneously
Solution Approach 1:
The patent segments the waveform design into distinct components: communication symbols and radar parameters. By treating these as separate estimable entities within the joint waveform framework, the system maintains spectral efficiency while reducing transmit processing complexity through structured separation of estimation targets.
Solution Approach 2:
The patent changes the parameter space by formulating the joint estimation problem in terms of communication symbols and radar parameters that can be estimated simultaneously from received signals. This parameter transformation enables efficient utilization of the waveform degrees of freedom while managing complexity through proper mathematical formulation.
2Productivity
If mmWave band radar is used to provide high bandwidth for communication, then data rate is improved, but the reliability of sensing and communication operations deteriorates due to spectrum shortage and interference
Solution Approach 1:
The patent merges radar sensing and communication operations into a single joint waveform system operating in the mmWave band. By combining these functions, the system achieves high data rates through radar bandwidth while improving reliability through hybrid processing that leverages both sensing and communication capabilities for mutual enhancement.
Solution Approach 2:
The patent creates a multi-functional system where the mmWave radar waveform serves dual purposes: high-rate communication and reliable sensing. This universal waveform design allows the same signal to achieve both objectives simultaneously, improving overall system reliability through the complementary nature of radar and communication operations.
3Productivity
If cooperative schemes for coexistence of communication and MIMO radar are implemented, then communication rate is improved, but the complexity of optimization problems increases due to symbol-level or per-CPI processing requirements
Solution Approach 1:
The patent applies preliminary action by pre-designing the joint waveform structure with embedded communication symbols and radar parameters before transmission. This pre-structuring allows for more efficient processing during reception, reducing the complexity of optimization problems compared to symbol-level or per-CPI approaches while maintaining high communication rates.
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 the spectral efficiency and bit error rate performance, allowing for accurate detection of target-related parameters like bistatic range and Doppler shift while maintaining robustness against interference, thereby improving the reliability of both radar and communication functionalities in automotive applications.
Implementation Method 1
a transmitter transmits a radar signal, which signal is a phase-modulated continuous waveform and comprises information encoded by phase modulation
Implementation Method 2
at least one target-related parameter is estimated based on the received signal... at least one bistatic Doppler shift can be estimated based on the detected information
Implementation Method 3
a transmitter transmits a radar signal... at least one target-related parameter is estimated based on the received signal
Data Source
AI summary
A method and system for joint radar communication for automotive applications. The system carries out the method and includes a transmitter transmitting a radar signal, which signal has a phase-modulated continuous waveform and includes information encoded by phase modulation, a receiver, spaced from the transmitter, receiving the signal, and the receiver detecting the information from the received signal. In order to provide an efficient concept for joint radar-communication for automotive applications, the signal is a multi-carrier phase-modulated continuous waveform having a plurality of carrier frequencies and the information is encoded onto each carrier frequency.