Delay-Doppler Channel Estimation for High-Speed V2X
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Solution Overview
Problem
High-speed V2X systems, such as those in high-speed railways, highway cars, and underwater acoustic communications, face significant challenges due to time and frequency dispersion caused by Doppler and signal delays, which degrade communication quality and reduce data reliability.
Innovation Solution
A new transmission and reception method in single carrier modes is designed to perform frame synchronization and channel estimation in the Delay-Doppler domain. This method includes carefully designing the transmitted signal frame and format to simplify frame synchronization and channel estimation, allowing for accurate detection of signals with reduced computational complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional channel estimation and frame synchronization methods are used in high-speed V2X systems, then the system can operate in highly mobile environments, but the time and frequency dispersion caused by Doppler and signal delays significantly degrades communication quality and reduces data reliability
Solution Approach 1:
The patent transforms the channel estimation problem from the traditional time-frequency domain to the Delay-Doppler domain. This dimensional transformation allows the receiver to separately estimate and compensate for delay and Doppler shifts, effectively addressing the time and frequency dispersion issues caused by high mobility without compromising communication reliability
2Measurement precision
If complex channel estimation and frame synchronization algorithms are used to compensate for Doppler and delay effects, then accurate signal detection can be achieved, but the computational complexity increases significantly
Solution Approach 1:
The patent segments the channel estimation process into distinct steps: frame synchronization to determine signal boundaries, delay estimation to identify propagation paths, and Doppler estimation to measure frequency shifts. This segmentation allows each parameter to be estimated independently using optimized algorithms, achieving accurate signal detection while reducing overall computational complexity compared to joint estimation methods
3Ease of operation
If the transmitted signal frame is designed for simplified processing, then frame synchronization and channel estimation can be performed more easily in the Delay-Doppler domain, but the flexibility in signal format design is reduced
Solution Approach 1:
The patent designs a universal signal frame structure that serves multiple functions: it enables frame synchronization through known preamble sequences, supports channel estimation in the Delay-Doppler domain, and maintains compatibility with various modulation schemes. This universal design achieves ease of operation for synchronization and estimation while preserving adaptability through configurable signal parameters and flexible data payload structures
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
The proposed solution effectively compensates for dispersion effects caused by Doppler and signal delays, enabling accurate detection of transmitted signals with lower computational complexity compared to prior art approaches, thereby improving communication reliability and quality in high-speed V2X systems.
Implementation Method 1
time and frequency dispersion because of the effect of Doppler and the delay of signals
Data Source
AI summary
The present disclosure provides a wireless receiver having a Delay Doppler channel detector. The Delay Doppler channel detector includes a Delay Dopper domain channel estimator and a detector and demodulator. The Delay Doppler domain channel estimator is configured for estimating a channel gain, a delay, and a Doppler frequency shift of a path of a channel of data received via the channel. The detector and demodulator is configured for extracting a symbol sequence of the received data based on the estimated channel gain, the estimated delay, and the estimated Doppler frequency shift of the path of the channel.