Rotated DFT‐s‐OFDM for transmitting PAPR‐minimised BPSK symbols. Issue 24 (3rd November 2020)

• Record Type: Journal Article
• Authors: Cho, L.; Huang, W.; Hsu, C.‐Y.
• Is Part Of: Electronics letters. Volume 56:Issue 24(2020)
• Page Start: 1350
• Page End: 1352
• Publication Date: 2020-11-03
• Subjects: phase shift keying -- computational complexity -- discrete Fourier transforms -- OFDM modulation -- radio links -- 3G mobile communication; data phase -- DFT spacing -- rotated DFT‐s‐OFDM -- PAPR‐minimised BPSK symbols -- third generation partnership project -- peak‐to‐average power ratio uplink transmission -- rotation angle -- optimal PAPR performance -- PAPR reduction -- allocated subcarriers -- discrete‐Fourier‐transform‐spread orthogonal frequency division multiplexing -- noise figure 0.2 dB; Electronics -- Periodicals; 621.381
• DOI: 10.1049/el.2020.2214
• Languages: English
• ISSNs: 0013-5194

Abstract

Abstract : 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.