OFDM Signal Generation for Ranging Precision
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Solution Overview
Problem
Conventional OFDM-based ranging measurement and positioning technologies suffer from low precision and poor range ambiguity resistance capability, failing to meet the higher requirements for ranging measurement and positioning services.
Innovation Solution
The method involves generating an OFDM signal by allocating power to specific subcarriers in two phases, with a first waveform having a smaller frequency spacing and a second waveform having a larger root mean square bandwidth, thereby improving range ambiguity resistance and precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signal power is allocated to all subcarriers in conventional OFDM, then the system maintains good spectral efficiency, but the frequency spacing between subcarriers becomes large which reduces range ambiguity resistance capability
Solution Approach 1:
The patent segments the subcarriers into two distinct groups: a first group of subcarriers with small frequency spacing for range ambiguity resistance, and a second group with large frequency spacing for measurement precision. This segmentation allows each group to optimize for its specific function without compromising the other, resolving the contradiction between reliability and measurement precision.
Solution Approach 2:
The patent applies local quality by assigning different power allocation strategies to different subcarrier groups. The first subcarrier group uses dense spacing with appropriate power allocation for unambiguous ranging, while the second group uses sparse spacing optimized for precision measurement. Each local region (subcarrier group) has tailored properties to fulfill its specific role.
2Measurement precision
If signal power is allocated to all subcarriers, then the bandwidth utilization is maximized, but the root mean square bandwidth becomes limited which reduces ranging measurement precision
Solution Approach 1:
The patent changes the power allocation parameter by introducing a selective power distribution mechanism. Instead of uniform power allocation across all subcarriers, the system dynamically allocates power to specific subcarrier groups based on their functional requirements. This parameter change enables the second subcarrier group to achieve large root mean square bandwidth for high precision while the first group maintains energy efficiency for range ambiguity resistance.
3Measurement precision
If conventional OFDM power allocation is used, then the system complexity remains low, but the ranging measurement precision and range ambiguity resistance cannot meet higher service requirements
Solution Approach 1:
The patent introduces dynamics into the previously static power allocation scheme. The system dynamically selects and configures two different subcarrier groups with distinct power allocation strategies according to ranging requirements. This dynamic approach enables the system to adapt to different service scenarios, achieving high precision and range ambiguity resistance while maintaining manageable complexity through structured flexibility.
Data Source
AI summary
Embodiments of the present invention disclose Orthogonal Frequency Division Multiplexing (OFDM) signal generation methods, related devices, and related application systems. An example method may include: obtaining parameter information of an OFDM signal; determining N first subcarriers and P second subcarriers from M subcarriers based on a preset parameter D; separately allocating signal power to the N first subcarriers and the P second subcarriers in two phases, to determine waveforms of the two phases, that is, a first waveform and a second waveform; and generating an OFDM signal including waveform symbols of the two phases.