Wireless LAN Preamble Sequence Generation Using Phase Rotation
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Solution Overview
Problem
Current wireless communication systems face challenges in maximizing adaptive gain control (AGC) while minimizing peak to average power ratio (PAPR) degradation, especially in scenarios with increased bandwidth and multiple user equipment (UE) interactions, which affects network performance and efficiency.
Innovation Solution
A method is proposed to generate a sequence structure using basic sequences like C48, X6, and X5, with specific tone configurations and phase rotation factors, applied in a preamble to enhance performance and adapt to varying bandwidths, thereby optimizing AGC and reducing PAPR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional preamble sequence is used, then the structure is simple, but the AGC performance cannot be maximized and PAPR degradation occurs
Solution Approach 1:
The preamble sequence is divided into multiple segments (first sequence and second sequence) with different structures. The first sequence uses a specific pattern (e.g., B0-B7) while the second sequence uses a different pattern (e.g., A0-A7), allowing optimization of AGC performance in different time periods without uniformly increasing PAPR across the entire preamble.
Solution Approach 2:
The patent applies different phase rotation factors to different segments of the preamble sequence dynamically. The phase rotation factor changes between the first and second sequences, allowing the system to adaptively optimize AGC performance for each segment while managing PAPR degradation through varied phase characteristics.
2Productivity
If the bandwidth is increased, then the data rate is improved, but the PAPR degradation is exacerbated
Solution Approach 1:
The patent segments the wideband preamble into multiple narrower-band sequences (first and second sequences) with different phase rotation factors. This segmentation allows the system to maintain higher data rates through increased bandwidth while reducing PAPR degradation by applying different phase characteristics to different segments, preventing constructive interference that would otherwise increase peak power.
3Adaptability or versatility
If a single phase rotation factor is used, then the sequence generation is simple, but the performance cannot be optimized for different bandwidths
Solution Approach 1:
The patent dynamically selects and applies different phase rotation factors based on the communication bandwidth. For example, a first phase rotation factor is applied to the first sequence and a second phase rotation factor to the second sequence, with the specific factors chosen according to the bandwidth configuration. This dynamic approach enables bandwidth optimization while maintaining manageable system complexity through structured selection rules.
Data Source
AI summary
Disclosed is a sequence generation method comprising: generating a basic sequence structure including C48 having 48 tones, X6 having six tones, and X5 having five tones; selecting any one of a plurality of phase rotation factors predetermined for a bandwidth; and generating a sequence to be inputted into a preamble to be transmitted to a terminal, by using the phase rotation factor, applied in basic sequence structural units, and the basic sequence structure.