Tracking Reference Signal Mapping for High-Frequency Phase Compensation
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Solution Overview
Problem
Existing wireless communications systems face challenges in efficiently utilizing frequency bands above and above 6 GHz, particularly in managing phase errors and improving receiving performance.
Innovation Solution
A reference signal sending method and device that generates a tracking reference signal corresponding to the DMRS port, and maps it to a time-frequency resource, and sends it to a time-frequency resource, allowing the receiving device to estimate and compensate for phase changes, thereby enhancing receiving performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the operating frequency band is increased above 6 GHz to provide ultrafast data communications service, then bandwidth and throughput are improved, but phase noise and Doppler effect impact are aggravated
Solution Approach 1:
The patent applies preliminary action by generating and sending tracking reference signals before actual data transmission to pre-characterize the channel conditions. These reference signals enable the receiving device to estimate phase errors and Doppler effects in advance, preparing compensation parameters before the actual data-bearing signals are transmitted, thus mitigating the adverse effects of high-frequency operation.
Solution Approach 2:
The patent implements feedback by using tracking reference signals to continuously monitor and estimate phase errors and Doppler effects during transmission. The receiving device calculates channel estimates from these reference signals and uses the feedback information to compensate for phase noise and Doppler impacts on subsequent data reception, creating a closed-loop system that adapts to high-frequency channel conditions.
2Measurement precision
If tracking reference signal is mapped to time-frequency resource to enable phase error estimation, then receiving performance is improved, but system complexity increases
Solution Approach 1:
The patent uses tracking reference signals as intermediary elements that facilitate phase error estimation without requiring direct measurement of the phase errors themselves. These reference signals serve as mediators between the transmitted signal and the received signal, enabling the receiving device to infer channel conditions and phase errors through comparison, thus simplifying the measurement process while maintaining accuracy.
Solution Approach 2:
The patent applies copying by creating known reference signal patterns that are transmitted along with data signals. These reference signals are exact copies of predetermined sequences that the receiving device already knows, allowing it to compare the expected pattern with the received pattern to estimate phase errors. This copying approach simplifies the estimation process by providing a known reference for comparison rather than requiring complex direct measurement.
Data Source
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AI summary
A reference signal sending method and a communications device are provided. The reference signal sending method includes: generating, by a first device, a tracking reference signal, where the tracking reference signal corresponds to a DMRS port that is used by the first device when the first device sends data to a second device, and the tracking reference signal is used to track a phase change experienced by a reference signal when the reference signal is transmitted on a channel corresponding to the DMRS port; mapping, by the first device, the tracking reference signal to a time-frequency resource that is used by the first device when the first device sends the data to the second device through the DMRS port, where the tracking reference signal is mapped to at least two modulation symbols on a same frequency resource in one transmission slot; and sending, by the first device, the tracking reference signal mapped to the time-frequency resource to the second device.