Walsh‐Hadamard‐transform‐based SC‐FDMA system using WARP hardware

Abstract

AbstractSingle‐carrier frequency division multiple access (SC‐FDMA) is currently being used in long‐term evolution uplink communications owing to its low peak‐to‐average power ratio (PAPR). This study proposes a new transceiver design for an SC‐FDMA system based on Walsh‐Hadamard transform (WHT). The proposed WHT‐based SC‐FDMA system has low‐PAPR and better bit‐error rate (BER) performance compared with the conventional SC‐FDMA system. The WHT‐based SC‐FDMA transmitter has the same complexity as that of discrete Fourier transform (DFT)‐based transmitter, while the receiver's complexity is higher than that of the DFT‐based receiver. The exponential companding technique is used to reduce its PAPR without degrading its BER. Moreover, the performances of different ordered WHT systems have been studied in additive white Gaussian noise and multipath fading environments. The proposed system has been verified experimentally by considering a real‐time channel with the help of wireless open‐access research platform hardware. The supremacy of the proposed transceiver is demonstrated based on simulated and experimental results.

Keywords

• companding technique
• ofdm and multi‐carrier systems
• papr
• real‐time channels
• sc‐fdma
• warp
• wht