Reference-Signal Local Oscillator Correction for Down-Conversion
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Solution Overview
Problem
In wireless communication systems, poor local oscillator stability leads to frequency offset issues, causing signal energy loss and interference, which adversely affect demodulation performance.
Innovation Solution
A frequency offset correction method that adjusts local oscillator signals based on reference signal reception, ensuring a reduced frequency offset for accurate down-conversion and spectrum migration, thereby reducing energy loss and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a local oscillator is used for down-conversion, then radio frequency signals can be received, but frequency offset occurs due to poor stability, causing signal energy loss and interference
Solution Approach 1:
The patent applies preliminary action by receiving a reference signal before the actual data signal, using this reference signal to estimate and correct frequency offset in advance. This ensures that when the data signal is received, the local oscillator has already been adjusted to minimize frequency offset, thereby reducing signal energy loss and improving demodulation performance.
Solution Approach 2:
The patent implements feedback by using the received reference signal to generate correction information that adjusts the local oscillator frequency. The feedback loop continuously monitors the frequency offset through the reference signal and applies correction, ensuring optimal frequency alignment during data signal reception and minimizing energy loss.
2Measurement precision
If frequency offset is not corrected, then down-conversion can be performed, but spectrum migration is inaccurate, causing adjacent-channel interference
Solution Approach 1:
The patent applies preliminary action by performing frequency offset correction using a reference signal before receiving the data signal. This preliminary correction ensures that the local oscillator is properly frequency-aligned, enabling accurate spectrum migration of the subsequent data signal and preventing adjacent-channel interference.
Solution Approach 2:
The patent uses a reference signal as an intermediary to enable frequency offset correction. The reference signal serves as a mediator between the transmitter and receiver, providing the necessary frequency information to adjust the local oscillator, thereby ensuring accurate spectrum migration and reducing interference.
3Reliability
If local oscillator frequency is adjusted, then frequency offset is reduced, but additional processing is required for reference signal reception and adjustment
Solution Approach 1:
The patent applies preliminary action by performing frequency offset correction using a reference signal before the actual data signal reception. This approach consolidates the processing complexity into a preliminary phase, where the frequency alignment is established once, reducing the need for continuous complex processing during data signal reception and improving overall system efficiency.
Data Source
AI summary
This application provides a frequency offset correction method and a communication apparatus, and relates to the field of wireless communication technologies. The method includes: A second device performs down-conversion by using a first local oscillator signal, to receive a first reference signal from a first device, and adjusts the first local oscillator signal based on a receiving result of the first reference signal, to obtain a second local oscillator signal, where a frequency offset of the second local oscillator signal is less than a frequency offset of the first local oscillator signal. The second device performs down-conversion by using the second local oscillator signal, to receive a first data signal from the first device, where a guard band of the first reference signal is greater than a guard band of the first data signal.