PTRS Pattern Selection for High-Frequency OFDM Demodulation
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Solution Overview
Problem
High-frequency communication systems face performance degradation due to phase noise, carrier frequency offset, and Doppler frequency shift, leading to demodulation issues and reduced spectral efficiency, especially in high-frequency bands like 28 GHz, 39 GHz, and 60 GHz.
Innovation Solution
A method and apparatus for determining a phase tracking reference signal (PTRS) pattern by configuring or determining a scheduled bandwidth threshold and PTRS pattern that meets specific conditions, ensuring demodulation performance and improving spectral efficiency by optimizing PTRS placement and overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PTRS is introduced to compensate for phase noise at high frequencies, then demodulation performance is improved, but spectral efficiency deteriorates due to increased overhead from additional reference signals
Solution Approach 1:
The patent applies local quality by configuring different PTRS patterns for different scheduled bandwidth ranges. Instead of using a uniform PTRS configuration across all bandwidths, the system adapts the PTRS pattern (density, mapping locations) locally according to the specific bandwidth condition, thereby optimizing the balance between phase noise compensation and spectral efficiency for each local scenario
Solution Approach 2:
The patent implements dynamics by making the PTRS pattern configurable and adaptable based on scheduled bandwidth conditions. The network device can dynamically select appropriate PTRS patterns from multiple options, and the configuration can be adjusted according to changing channel conditions and bandwidth allocations, transforming a static reference signal approach into a dynamic one
2Ease of operation
If PTRS pattern is configured without considering mapping location conditions, then configuration simplicity is maintained, but demodulation performance deteriorates due to fuzzy behavior in pattern determination
Solution Approach 1:
The patent applies preliminary action by pre-defining multiple PTRS patterns with different characteristics (densities, mapping locations) before actual transmission. The network device selects from these pre-configured patterns based on scheduled bandwidth conditions, avoiding the complexity of real-time pattern generation while ensuring appropriate patterns are chosen for each scenario
Solution Approach 2:
The patent implements parameter changes by varying key PTRS parameters (pattern density, mapping locations, time-domain positions) across different configured patterns. The network device adjusts these parameters based on the scheduled bandwidth range, transforming a single-parameter configuration into a multi-parameter optimization approach
3Productivity
If PTRS pattern uses continuous mapping locations, then resource utilization is improved, but phase noise compensation effectiveness deteriorates due to lack of distribution
Solution Approach 1:
The patent applies segmentation by dividing the frequency resources into different scheduled bandwidth ranges and assigning different PTRS patterns to each range. This segmentation ensures that PTRS symbols are properly distributed across the frequency spectrum according to the specific bandwidth condition, improving both resource utilization and phase noise compensation effectiveness
Data Source
AI summary
This application provides a method and an apparatus for determining a phase tracking reference signal (PTRS) pattern. The method includes: A terminal device receives first scheduled bandwidth threshold information from a network device, where a first scheduled bandwidth threshold indicated by the first scheduled bandwidth threshold information meets a first condition, and the first condition is that a ratio of a total quantity of modulation symbols in a PTRS pattern determined based on the first scheduled bandwidth threshold to a quantity of subcarriers in scheduled bandwidth is less than or equal to a first threshold; and determines a PTRS pattern on one orthogonal frequency division multiplexing (OFDM) symbol in an OFDM signal based on the scheduled bandwidth threshold. In this application, the network device configures, for the terminal device, the scheduled bandwidth threshold that meets the first condition, to ensure demodulation performance of the device.