Pilot Sequences in Data Streams for Phase Drift Mitigation
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently determining and allocating pilot signals for data transmission, particularly in systems using single stream pilots, which can lead to phase drift issues affecting data symbol orthogonality.
Innovation Solution
The proposed solution involves a method for allocating resource units and determining pilot signals in wireless networks, specifically using a tone plan that defines pilot tone locations within resource units, and employing a pilot sequence that depends on the resource unit size or communication bandwidth to ensure accurate phase tracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If single stream pilots are used for data transmission, then device complexity is reduced, but phase drift issues occur affecting data symbol orthogonality
Solution Approach 1:
The patent applies preliminary action by determining pilot sequences before data transmission based on resource unit allocation. The receiving device uses these predetermined sequences to perform phase tracking and compensation, preventing phase drift from affecting orthogonality during actual transmission.
Solution Approach 2:
The patent changes parameters by making pilot sequences dependent on resource unit size and communication bandwidth. Different resource unit configurations use different pilot sequences, allowing the system to adapt to varying conditions while maintaining orthogonality and reducing phase drift effects.
2Measurement precision
If pilot sequences are made dependent on resource unit size or communication bandwidth, then measurement precision of phase tracking is improved, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by making pilot sequences variable based on resource unit size and communication bandwidth. This allows the system to optimize phase tracking precision for different configurations while maintaining manageable complexity through systematic sequence selection.
Solution Approach 2:
The patent achieves universality by creating a pilot sequence determination mechanism that works across multiple resource unit sizes and bandwidth configurations. A single framework handles diverse scenarios, improving measurement precision without proportionally increasing complexity.
3Reliability
If accurate phase tracking is implemented, then data symbol orthogonality is maintained, but loss of time in processing increases
Solution Approach 1:
The patent applies preliminary action by determining and distributing pilot sequences before actual data transmission. The receiving device has these sequences ready for immediate phase tracking, reducing processing time while maintaining orthogonality through pre-configured reference signals.
Solution Approach 2:
The patent implements self-service by enabling the receiving device to autonomously perform phase tracking using the transmitted pilot sequences. This self-contained approach maintains orthogonality without requiring additional processing time for external coordination or complex multi-device coordination.
Data Source
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AI summary
A method, an apparatus, and a computer-readable medium for wireless communication are provided. In one aspect, an apparatus is configured to determine a plurality of resource units for communication. The apparatus is configured to generate a set of pilot signals in at least one resource unit of the plurality of resource units. The apparatus is configured to transmit the generated set of pilot signals in the at least one resource unit of the plurality of resource units.