Phase Compensation for Non-Center Frequency Signals in 5G
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Solution Overview
Problem
In 5G communication systems, terminal devices with limited bandwidth struggle to access a 400 MHz carrier bandwidth due to frequency deviations and phase differences caused by synchronization signals or data not being at the center frequency, leading to incorrect data reception.
Innovation Solution
A transmission method that performs phase compensation on synchronization signals or data not at the center frequency, eliminating phase differences and subcarrier offsets, allowing correct demodulation and access to the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If synchronization signal or data is placed at non-center frequency positions to support terminal devices with narrow bandwidth, then terminal devices can access different frequency domain positions, but frequency deviation is generated causing phase difference and subcarrier offset
Solution Approach 1:
The patent applies preliminary action by performing phase compensation on the synchronization signal or data before transmission. The network device pre-calculates and applies the necessary phase correction based on the frequency position offset from the center frequency, so that when the terminal device receives the signal, the phase difference and subcarrier offset are already compensated, enabling correct demodulation without requiring the terminal to know the exact frequency deviation values
Solution Approach 2:
The patent changes the phase parameter of the synchronization signal or data based on its frequency position. By adjusting the phase parameter according to the offset from center frequency, the system maintains reliable demodulation performance across different frequency positions, allowing terminal devices with various bandwidth capabilities to access appropriate frequency domain positions while ensuring accurate data reception
2Reliability
If phase compensation is performed on synchronization signal or data at non-center frequency, then correct demodulation is achieved, but additional processing steps are required
Solution Approach 1:
The patent applies self-service by making the phase compensation process automatic and integrated into the existing signal processing pipeline. The network device automatically determines the frequency position offset and applies the corresponding phase compensation without requiring manual intervention or complex external control mechanisms, reducing overall system complexity while maintaining demodulation accuracy
Data Source
AI summary
This application provides a transmission method and a transmission apparatus, so that a receive end can correctly demodulate data. A transmission method may include performing a phase compensation operation of a corresponding frequency value on each of m first signals in k signals, to obtain m second signals, where each of the m first signals is located at a non-center frequency of a current carrier, each first signal is a synchronization signal or data, m and k each are a positive integer, and m≤k. The method may also include performing sending processing on the m second signals.