Uplink Signal Sequence Generation for 5G Interference Reduction
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Solution Overview
Problem
Current LTE systems lack a clear solution for base sequences used in pilot signal transmission and data frequency domain spreading in new wireless communication systems, such as 5G, leading to issues with peak-to-average power ratio and correlation between sequences, which affect signal transmission performance and inter-cell interference.
Innovation Solution
A method is introduced to generate uplink signal sequences by configuring phases φ(n)π/4 for base sequences, performing a full traversal of possible phases, and selecting sequences with the lowest peak-to-average power ratio and cross-correlation characteristics, thereby reducing interference between different sequences of cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional base sequences are used for uplink signal transmission, then the system maintains compatibility with existing LTE standards, but the peak-to-average power ratio increases and correlation between sequences worsens, degrading signal transmission performance
Solution Approach 1:
The patent changes the phase parameters of the base sequence by introducing a phase rotation factor e^(jαn) where α is specifically designed to reduce peak-to-average power ratio. This parameter modification transforms the traditional base sequence into an optimized sequence that maintains orthogonality while reducing PAPR, directly resolving the contradiction between reliable signal transmission and harmful peak power effects
2Reliability
If traditional base sequences are used for uplink signal transmission, then the system maintains compatibility with existing LTE standards, but correlation between sequences increases, leading to increased interference between different cells
Solution Approach 1:
The patent modifies the phase parameters of base sequences using different rotation factors e^(jαn) for different cell groups. This parameter change ensures that sequences from different cells maintain low correlation while preserving the orthogonality within each cell, thereby reducing inter-cell interference and improving overall signal transmission reliability
Data Source
AI summary
A method of generating an uplink signal sequence, a user equipment, a base station and a computer-readable storage medium are provided. The method includes: generating an uplink signal sequence ru,v(α)(n) based on ru,v(α)(n)=ejαnru,v(n), 0≤n<12, where a is configured to distinguish a terminal, an uplink signal base sequence ru,v(n)=ejφ(n)π/4, where u represents a group number, and v represents an intra-group base sequence number, φ(n)π/4 represents a phase of a base sequence; performing a full traversal of multiple possible phases of the phase φ(n)π/4 on the uplink signal sequence with a length of 12, and selecting a predetermined number of uplink signal sequences with a lowest peak-to-average power ratio and a lowest cross-correlation characteristic.