Pi/2-BPSK Reference Signal Sequence Selection for Lower PAPR
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Solution Overview
Problem
Existing pi/2-BPSK modulation with frequency domain spectral shaping (FDSS) exhibits an unacceptably high peak-to-average power ratio (PAPR), which affects the efficiency of wireless communication devices.
Innovation Solution
Design a reference signal for pi/2-BPSK modulation by selecting a sequence from a plurality of candidate sequences, ensuring the reference signal is associated with data modulated according to pi/2-BPSK, thereby reducing PAPR through appropriate sequence selection and FDSS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pi/2-BPSK modulation with frequency domain spectral shaping (FDSS) is used, then spectral efficiency is improved, but peak-to-average power ratio (PAPR) becomes unacceptably high
Solution Approach 1:
The patent applies parameter changes by modifying the sequence selection criteria and FDSS parameters to achieve a balance between spectral efficiency and PAPR reduction. Specifically, the system selects sequences and applies filtering parameters that simultaneously optimize both objectives, transforming the conflicting requirements into a coordinated solution.
2Productivity
If existing pi/2-BPSK modulation with FDSS is used, then data transmission is enabled, but power amplifier efficiency deteriorates due to high PAPR
Solution Approach 1:
The patent modifies transmission parameters including sequence selection and FDSS filtering parameters to reduce PAPR while maintaining data transmission capability. This parameter optimization allows the power amplifier to operate more efficiently without sacrificing communication functionality.
Data Source
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AI summary
Various aspects directed towards generating a reference signal for pi/2-binary phase shift keying (BPSK) modulation are disclosed. In an example, a pi/2-BPSK sequence is selected from a plurality of candidate sequences depending on the number of allocated Resource Blocks. The selection is between Computer Generated Sequences for small length and Gold or Zadoff-Chu (ZC) sequences for long length. A reference signal is then generated based on the selected pi/2.BPSK sequence such that the reference signal is associated with an uplink DFT-s-OFDM transmission of data modulated according to a π/2-BPSK modulation.