Wireless Sync Signal Generation for Frequency Offset and Low PAPR
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Solution Overview
Problem
Conventional wireless communication systems face challenges in achieving robust synchronization in environments with significant frequency offset and high Peak to Average Power Ratio (PAPR), which affects synchronization and demodulation performance, and increases amplifier costs.
Innovation Solution
The use of phase rotation sequences and modified Zadoff-Chu sequences allocated to subcarriers, along with phase rotation or phase shift operations, to generate sync and information signals that are robust against frequency offset and reduce PAPR, while achieving diversity gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional base sequences are allocated to frequency resources for synchronization, then synchronization acquisition is achieved, but performance deteriorates in environments with great frequency offset
Solution Approach 1:
The patent applies parameter changes by modifying the base sequence through phase rotation operations. Specifically, it uses Zadoff-Chu sequences with different root indices and applies phase rotation factors to create multiple variations of the base sequence, thereby improving robustness against frequency offset while maintaining synchronization performance
Solution Approach 2:
The patent employs composite sequences formed by combining multiple base sequences with different properties. It allocates different Zadoff-Chu sequences with distinct root indices to different frequency resources and combines them through phase rotation, creating a composite signal structure that is more resilient to frequency offset
2Reliability
If synchronization methods are designed to overcome frequency offset, then frequency offset robustness improves, but Peak to Average Power Ratio (PAPR) cannot be greatly reduced
Solution Approach 1:
The patent changes the phase parameters of the base sequences through rotation operations. By adjusting phase rotation factors and using sequences with different root indices, it achieves both frequency offset robustness and PAPR reduction simultaneously, rather than treating these as conflicting objectives
Solution Approach 2:
The patent introduces dynamic phase rotation that adapts to different frequency conditions. The phase rotation factors are designed to provide different phase relationships under different frequency offset conditions, enabling the system to dynamically respond to frequency variations while controlling PAPR
3Power
If high PAPR signals are transmitted, then signal transmission is achieved, but expensive amplifiers are required to prevent distortion, increasing cost
Solution Approach 1:
The patent optimizes the power distribution parameters by controlling the phase relationships between different base sequences. This parameter optimization reduces the peak power requirements while maintaining adequate transmission levels, enabling the use of lower-cost amplifiers that operate more efficiently
Data Source
AI summary
A method and apparatus for generating a signal in a wireless communication system by allocating a sequence to a plurality of subcarriers for sending the signal and generating the signal based on the sequence and a phase rotation sequence are provided.