OFDM Timing Synchronization for Precise Wireless Ranging
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Solution Overview
Problem
Existing OFDM-based wireless communication systems face challenges in achieving precise ranging, angle measurement, or positioning due to synchronization phase errors, leading to inaccurate results.
Innovation Solution
Implementing fixed intervals between signal transmission and reception start points for OFDM symbols to reduce synchronization errors, allowing for precise channel estimation and correction of measurement results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If OFDM signal is used for wireless communication, then communication speed and data rate are improved, but synchronization phase errors are introduced leading to poor measurement precision
Solution Approach 1:
The patent applies preliminary action by pre-calculating and setting fixed time intervals (first preset duration and second preset duration) between transmission and reception start points before actual communication occurs. This pre-established timing framework allows the system to compensate for synchronization phase errors in advance, enabling precise ranging measurements while maintaining high communication speed through OFDM signals.
Solution Approach 2:
The patent changes the timing parameters by establishing fixed interval durations between transmission and reception operations. By controlling and standardizing these time parameters (first preset duration for one-way time, second preset duration for round-trip time), the system eliminates synchronization phase errors and achieves precise measurement of time of flight for ranging applications.
2Measurement precision
If fixed time intervals are implemented between transmission and reception, then synchronization errors are reduced, but system complexity increases
Solution Approach 1:
The system performs preliminary calculation and establishment of fixed time intervals before actual ranging operations. By pre-defining the first preset duration and second preset duration, the complex synchronization problem is solved in advance through simple time stamping and interval measurement, avoiding the need for complex real-time synchronization algorithms during communication.
Solution Approach 2:
The system uses its own transmission and reception time stamps to automatically calculate the fixed time intervals. Each communication node independently records its own transmission start time and reception start time, then computes the interval durations without requiring external synchronization signals or complex coordination with other nodes, thereby reducing overall system complexity.
Data Source
AI summary
The first node sends a first OFDM symbol to the second node, where a sending start time point of the first OFDM symbol is a first time point. The second node receives the first OFDM symbol, where a receiving start time point of the first OFDM symbol is a second time point. The second node is starts to send a second OFDM symbol to the first node at a third time point, where there is an interval of first preset duration between the third time point and the second time point. The first node starts to receive the second OFDM symbol at a fourth time point, where the fourth time point serves as a receiving start time point at which the first node receives the second OFDM symbol, and there is an interval of second preset duration between the fourth time point and the first time point.