The third generation partnership project has recommended π /2-binary phase-shift keying (BPSK) in discrete-Fourier-transform-spread orthogonal frequency division multiplexing (DFT-s-OFDM) for low peak-to-average power ratio (PAPR) uplink transmission. Recently, the rotation angle of 7 π /6 for rotated BPSK has been proposed by J. Kim et al. to achieve optimal PAPR performance. However, the authors discovered that this angle might negate the contribution to PAPR reduction in most number of allocated subcarriers owing to the discrete-Fourier-transform (DFT) boundary-matching problem. To solve this issue, they propose a novel scheme to fine-tune the rotation angle to approximately 7 π /6 in a manner compatible with the long-term evolution/new radio specification, while ensuring that the data phase matches the periodicity. Simulations show that the proposed scheme can stably improve the PAPR by ∼0.2 dB compared to π /2-BPSK for any DFT spacing, thereby benefiting user equipment by providing better power efficiency and wider signal coverage without additional computational complexity.

中文翻译：

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旋转DFT-s-OFDM，用于传输PAPR最小的BPSK符号

第三代合作伙伴项目建议 π 离散傅里叶变换扩展正交频分复用（DFT-s-OFDM）中的/ 2二进制相移键控（BPSK）用于低峰均功率比（PAPR）上行链路传输。最近，旋转角度为7 π J. Kim已提出旋转BPSK的/ 6 等。以获得最佳的PAPR性能。然而，作者发现，由于离散傅里叶变换（DFT）边界匹配问题，该角度可能会抵消大部分已分配子载波对降低PAPR的贡献。为了解决这个问题，他们提出了一种新颖的方案来将旋转角微调到大约7 π / 6以与长期演进/新无线电规范兼容的方式，同时确保数据相位与周期性匹配。仿真结果表明，与方案相比，该方案可以将PAPR稳定地提高约0.2 dB。π / 2-BPSK适用于任何DFT间隔，从而通过提供更高的功率效率和更宽的信号覆盖范围而无额外的计算复杂性，从而使用户设备受益。