OFDM Communication Radar Module for Frequency Offset Distance Correction
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Solution Overview
Problem
OFDM signals in communication radar compatible systems face limitations in bandwidth, leading to deterioration of radar functions such as distance estimation due to their design characteristics, necessitating a method to improve accuracy in distance estimation.
Innovation Solution
A communication module and method that includes transmitting and receiving OFDM signals through multiple antennas, converting analog signals to digital, generating a target distance signal, estimating a frequency offset, and correcting the distance estimation value using a signal processing circuit to enhance accuracy without additional hardware or high computational load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If OFDM signals are used in communication radar compatible systems, then communication function is achieved, but distance estimation accuracy deteriorates due to limited bandwidth
Solution Approach 1:
The patent applies parameter changes by modifying the frequency offset estimation and correction parameters in the signal processing chain. Specifically, it estimates frequency offsets more accurately using pilot signals and corrects the distance estimation values based on these frequency offsets, thereby improving measurement precision without changing the fundamental OFDM signal structure or bandwidth limitations
Solution Approach 2:
The patent implements feedback by using pilot signals embedded in the OFDM transmission to estimate frequency offsets, then applying these estimates to correct distance estimation values. This closed-loop approach continuously refines the distance measurement accuracy by compensating for frequency-related errors that arise from bandwidth limitations
2Measurement precision
If frequency offset correction is applied to improve distance estimation accuracy, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by estimating frequency offsets using pilot signals that are transmitted beforehand with the OFDM signal. This preliminary frequency offset estimation allows the system to prepare correction values in advance, which are then applied to improve distance estimation accuracy without requiring complex real-time processing during the main measurement phase
Data Source
AI summary
An operating method of a communication module in a communication radar compatible system, may include: transmitting, via a plurality of antennas, a transmission signal to at least one target using; receiving, via a plurality of antennas, an analog reception signal reflected from the at least one target; converting the analog reception signal into a digital reception signal; generating a target distance signal related to a distance to the at least one target based on the digital reception signal; estimating a frequency offset based on the target distance signal; correcting a distance estimation value to the at least one target based on the frequency offset; and outputting the corrected distance estimation value.