OFDM Symbol Generation Reducing PAPR via Unified PTRS Modulation
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Solution Overview
Problem
In 5G communication systems, the independent modulation of Phase Tracking Reference Signal (PTRS) and data bit sequences leads to phase jumps at boundary sampling points, resulting in high Peak to Average Power Ratio (PAPR), which affects transmission efficiency.
Innovation Solution
A method of generating an OFDM symbol by inserting and modulating a PTRS bit sequence into a data bit sequence using π/2-BPSK or BPSK modulation, followed by phase-rotation to ensure consistent phase variation of ±π/2, thereby reducing PAPR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If PTRS bit sequence and data bit sequence are independently modulated, then modulation simplicity is improved, but phase jump occurs at boundary sampling points resulting in high PAPR
Solution Approach 1:
The patent merges the modulation process of PTRS bit sequence and data bit sequence into a unified modulation operation. Instead of independently modulating each sequence, the method combines them first and then performs a single modulation operation, ensuring phase continuity and eliminating phase jumps at boundary sampling points.
Solution Approach 2:
The patent changes the modulation parameter approach by using a unified modulation index for both PTRS and data bit sequences. This parameter change ensures that the phase variation remains consistent (±π/2) across the entire modulated signal, preventing the phase jumps that occur when different modulation parameters are applied separately.
2Reliability
If PTRS sequence is inserted into data sequence in time domain chunks, then phase noise tracking capability is improved, but phase jump occurs at chunk boundaries increasing PAPR
Solution Approach 1:
The patent combines the PTRS sequence insertion with the data sequence in a unified modulation framework. By merging the sequences before modulation and applying a unified modulation operation, the method eliminates phase jumps at chunk boundaries while preserving the phase noise tracking capability provided by PTRS insertion.
Solution Approach 2:
The patent applies a unified modulation parameter across the entire combined sequence (PTRS + data), ensuring that the phase variation constraint (±π/2) is maintained consistently. This parameter uniformity prevents phase jumps at the boundaries where PTRS chunks meet data segments.
Data Source
AI summary
An OFDM symbol generation method and a communication device are provided. The method includes: generating a target sequence based on a PTRS bit sequence, wherein the target sequence includes a symbol sequence generated by inserting the PTRS bit sequence into a data bit sequence and performing modulation, a symbol sequence generated by inserting a modulated symbol sequence of the PTRS bit sequence into a modulated symbol sequence of the data bit sequence and performing phase-rotation, or a symbol sequence generated by inserting a PTRS symbol sequence into a data symbol sequence, the PTRS symbol sequence is generated by modulating the PTRS bit sequence according to an index of a PTRS bit, the data symbol sequence is generated by modulating the data bit sequence according to an index of a data bit; and generating the OFDM symbol based on the target sequence.