Cyclic Block PTRS Sequence Design for Low Complexity ICI Compensation
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Solution Overview
Problem
The extension of New Radio (NR) systems to frequencies above 52.6 GHz poses challenges in designing low complexity algorithms for phase noise compensation and phase tracking reference signals (PTRS) due to increased intercarrier interference (ICI), which existing methods struggle to address effectively.
Innovation Solution
The implementation of a cyclic block PTRS structure with either identical or different sequences in clusters, utilizing a circulant matrix to reduce the complexity of ICI compensation algorithms and minimize peak-to-average power ratio (PAPR) and cubic metric (CM), enabling efficient ICI compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ICI compensation algorithms are used in NR systems extending to frequencies above 52.6 GHz, then phase noise compensation can be performed, but the computational complexity and algorithm design become significantly more difficult due to increased intercarrier interference
Solution Approach 1:
The patent changes the parameter of PTRS sequence design by using cyclically extended base sequences with specific periodicity. This transforms the ICI compensation problem into a form that can be solved with lower complexity algorithms, as the cyclic structure enables more efficient estimation and compensation of phase noise effects at high frequencies above 52.6 GHz
Solution Approach 2:
The patent applies preliminary action by pre-configuring the PTRS sequences with cyclic extensions before transmission. This preliminary structuring of the reference signals enables the receiver to use simplified correlation-based estimation methods, avoiding the need for complex real-time algorithm execution while still achieving effective phase noise compensation
2Device complexity
If PTRS sequences are designed to reduce ICI compensation algorithm complexity, then computational requirements are lowered, but the peak-to-average power ratio and cubic metric may increase
Solution Approach 1:
The patent introduces asymmetry in the PTRS sequence design by using different cyclic extension patterns for different clusters. This asymmetric approach allows optimization of the sequence properties to reduce PAPR and CM while maintaining the cyclic structure needed for low-complexity ICI compensation. The asymmetric cyclic extensions create more favorable power distribution characteristics
Solution Approach 2:
The patent applies local quality by designing different PTRS sequences for different frequency clusters based on their specific characteristics. Each cluster receives a tailored cyclic extension pattern that optimizes both the algorithm complexity and the power characteristics for that specific region, rather than using a uniform approach across all clusters
Data Source
AI summary
A method, system and apparatus for low complexity intercarrier interference (ICI) compensation algorithms and cyclic block phase tracking reference signal (PTRS) sequence design are disclosed. According to one aspect, a method in a network node includes generating a PTRS, having a PTRS sequence that is configured to lower a complexity of an ICI compensation algorithm. According to another aspect, a method in a wireless device (WD) includes determining an ICI compensation algorithm based at least in part on a PTRS having a PTRS sequence, and applying the determined ICI compensation algorithm to compensate for ICI.